Relevant bibliographies by topics / Neutron emissions

Academic literature on the topic 'Neutron emissions'

Author: Grafiati
Published: 14 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Neutron emissions.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Neutron emissions"

1

Petrucci, Andrea, Alberto Rosada, and Emilio Santoro. "Asymmetric neutron emissions from sonicated steel." Modern Physics Letters B 29, no. 14 (May 29, 2015): 1550067. http://dx.doi.org/10.1142/s0217984915500670.

Full text
Abstract:
Following up published works in which we studied and experimentally verified the assumptions of the theory of "Deformed Space-Time" in relation to piezonuclear emissions, and according to previous experiments of sonication by ultrasounds performed on solid materials with high density, cylindrical bars of AISI 304 steel have been sonicated by ultrasounds of the power of 330 Watts and frequency of 20 KHz. We verified by means of passive detectors CR39 (PADC) pulsed emissions of neutrons. In this work, following a recent proposal, it was decided to perform a stereoscopic measurement of neutron emission. It has been verified that they are characterized by a distribution which is anisotropic and asymmetric in the space. The work shows a wide and accurate description of the experiment and the results of neutron emissions, and we stress that there exist two directions corresponding to maximum emission (maximum dose) and zero emission (null dose).
APA, Harvard, Vancouver, ISO, and other styles
2

Albertini, G., V. Calbucci, and F. Cardone. "Statistics of piezonuclear emissions: early results." Modern Physics Letters B 28, no. 05 (February 18, 2014): 1450036. http://dx.doi.org/10.1142/s0217984914500365.

Full text
Abstract:
Measurements of ionizing and nonionizing particles are performed during the rupture tests of steel rods having different diameter. A ZnS ( Ag ) alpha detector, a Geiger counter and a 3 He proportional counter for neutrons are used. From the distributions of the recorded intensity maxima, different particles emissions are suggested to occur in broken and nonbroken samples. A hint for the emission of neutrons at rupture is also obtained. Such neutron emissions are predicted in the framework of the piezonuclear theory.
APA, Harvard, Vancouver, ISO, and other styles
3

Petrucci, Andrea, and Alberto Rosada. "Ultrasonic Neutron Emissions." Journal of Advanced Physics 5, no. 1 (March 1, 2016): 63–68. http://dx.doi.org/10.1166/jap.2016.1246.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Pozzi, Sara A., Brian Wieger, Andreas Enqvist, Shaun D. Clarke, Marek Flaska, Matthew Marcath, Edward Larsen, Robert C. Haight, and Enrico Padovani. "Correlated Neutron Emissions from252Cf." Nuclear Science and Engineering 178, no. 2 (October 2014): 250–60. http://dx.doi.org/10.13182/nse13-96.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Bradnam, Steven C., Vytautas Astromskas, Zamir Ghani, Mark R. Gilbert, Malcolm J. Joyce, and Lee W. Packer. "DEVELOPMENT AND EXPERIMENTAL VALIDATION OF RESPONSE MODELLING FOR TIME-OF-FLIGHT NEUTRON DETECTION AND IMAGING SYSTEMS." EPJ Web of Conferences 247 (2021): 16001. http://dx.doi.org/10.1051/epjconf/202124716001.

Full text
Abstract:
The application and feasibility of a time-of-flight neutron detection system is explored for sources with time correlated gamma-ray and neutron emissions, such as the spontaneous fission emitter, Cf-252. For the emission of multiple gamma rays and neutrons from a single spontaneous fission event, a near instantaneous gamma-ray detection followed by a later neutron detection on a multi-detector array allows for an associated time-of-flight to be determined for a neutron arising from that event. Using a suite of purpose developed analysis tools, Monte-Carlo simulation and experimental data are compared for the Cf-252 water tank source facility at Lancaster University. Applying a bespoke time-of-flight imaging algorithm, vector-based optimisation (VBO), the true source location is determined within 21 cm by this approach.
APA, Harvard, Vancouver, ISO, and other styles
6

Muraki, Y., K. Koga, T. Goka, H. Matsumoto, T. Obara, O. Okudaira, S. Shibata, and T. Yamamoto. "Measurement by FIB on the ISS: Two Emissions of Solar Neutrons Detected?" Advances in Astronomy 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/379304.

Full text
Abstract:
A new type of solar neutron detector (FIB) was launched on board the Space Shuttle Endeavour on July 16, 2009, and began collecting data at the International Space Station (ISS) on August 25, 2009. This paper summarizes the three years of observations obtained by the solar neutron detector FIB until the end of July 2012. The solar neutron detector FIB can determine both the energy and arrival direction of neutrons. We measured the energy spectra of background neutrons over the South Atlantic Anomaly (SAA) region and elsewhere and found the typical trigger rates to be 20 and 0.22 counts/sec, respectively. It is possible to identify solar neutrons to within a level of 0.028 counts/sec, provided that directional information is applied. Solar neutrons were possibly observed in association with the M-class solar flares that occurred on March 7 (M3.7) and June 7 (M2.5) of 2011. This marked the first time that neutrons had been observed in M-class solar flares. A possible interpretation of the production process is provided.
APA, Harvard, Vancouver, ISO, and other styles
7

Vartanyan, David, Adam Burrows, and David Radice. "Temporal and angular variations of 3D core-collapse supernova emissions and their physical correlations." Monthly Notices of the Royal Astronomical Society 489, no. 2 (August 21, 2019): 2227–46. http://dx.doi.org/10.1093/mnras/stz2307.

Full text
Abstract:
Abstract We provide the time series and angular distributions of the neutrino and gravitational wave emissions of 11 state-of-the-art 3D non-rotating core-collapse supernova models and explore correlations between these signatures and the real-time dynamics of the shock and the proto-neutron star (PNS) core. The neutrino emissions are roughly isotropic on average, with instantaneous excursions about the mean inferred luminosity of as much as ±20 per cent. The deviation from isotropy is least for the ‘νμ’-type neutrinos and the lowest mass progenitors. Instantaneous temporal luminosity variations along a given direction for exploding models average ∼2–4 per cent, but can be as high as ∼10 per cent. For non-exploding models, they can achieve ∼25 per cent. The temporal variations in the neutrino emissions correlate with the temporal and angular variations in the mass accretion rate. We witness the lepton-number emission self-sustained asymmetry (LESA) phenomenon in all our models and find that the vector direction of the LESA dipole and that of the inner Ye distribution are highly correlated. For our entire set of 3D models, we find strong connections between the cumulative neutrino energy losses, the radius of the proto-neutron star, and the f-mode frequency of the gravitational wave emissions. When physically normalized, the progenitor-to-progenitor variation in any of these quantities is no more than ∼10 per cent. Moreover, the reduced f-mode frequency is independent of time after bounce to better than ∼10 per cent. Therefore, simultaneous measurement of gravitational waves and neutrinos from a given supernova event can be used synergistically to extract real physical quantities of the supernova core.
APA, Harvard, Vancouver, ISO, and other styles
8

Mohindroo, Kumar S., Yaron Danon, Ezekiel Blain, Matthew Devlin, and Keegan J. Kelly. "Quasi-differential neutron induced neutron emissions from 235U, and 239Pu." Annals of Nuclear Energy 165 (January 2022): 108647. http://dx.doi.org/10.1016/j.anucene.2021.108647.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Kromar, Marjan, and Bojan Kurinčič. "Assessment of the Photon and Neutron Source Term for the NPP Krško Spent Fuel." Journal of Energy - Energija 68, no. 2-3 (July 8, 2022): 184–98. http://dx.doi.org/10.37798/2019682-3202.

Full text
Abstract:
Accurate knowledge of the fuel nuclide inventory is important after reactor shut down, during the fuel storage and subsequent reprocessing or disposal to provide adequate shielding from the photon and neutron radiation. In this paper possibility to calculate the NPP Krško photon and neutron source term with the Serpent code has been analysed. Some deficiencies in the supplied ENDF/B-VII.0 decay library have been observed. In addition, Serpent reports only spontaneous fission rates without (α, n) and (β, n) contributions. To get neutron emission, spontaneous fission rates had to be multiplied with the average number of neutrons born for each particular nuclide manually. Comparison with the Origen code has shown acceptable agreement of the ENDF/B-VII.1 results. Influence of several factors such as fuel burnup, enrichment, temperature, moderator temperature (density), soluble boron concentration, average power, and burnable absorbers has been analysed. In addition, it was demonstrated that, except for the burnup and enrichment, averaging of all other parameters is acceptable approach. IFBA fuel should be accounted for explicitly due to relative high impact on the photon and neutron emissions.
APA, Harvard, Vancouver, ISO, and other styles
10

Kimura, Shigeo S. "High-energy emissions from neutron star mergers." EPJ Web of Conferences 210 (2019): 03001. http://dx.doi.org/10.1051/epjconf/201921003001.

Full text
Abstract:
In 2017, LIGO-Virgo collaborations reported detection of the first neutron star merger event, GW170817, which is accompanied by electromagnetic counterparts from radio to gamma rays. Although high-energy neutrinos were not detected from this event, mergers of neutron stars are expected to produce such high-energy particles. Relativistic jets are launched when neutron stars merge. If the jets contain protons, they can emit high-energy neutrinos through photomeson production. In addition, neutron star mergers produce massive and fast ejecta, which can be a source of Galactic high-energy cosmic rays above the knee. We briefly review what we learned from the multi-messenger event, GW170817, and discuss prospects for multi-messenger detections and hadronic cosmic-ray production related to the neutron star mergers.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Neutron emissions"

1

Khrbish, Yabia Saleh. "Application of neutron and proton induced prompt emissions for elemental analysis." Thesis, University of Surrey, 1987. http://epubs.surrey.ac.uk/844238/.

Full text
Abstract:
The principles of neutron and proton induced reactions and their application to elemental analysis are described. Prompt Gamma-ray Neutron Activation Analysis (PGNAA) as a relatively rapid technique for the determination of trace amounts (ppm) of B and Cd is given. The need to establish the absolute method of analysis is investigated through the evaluation of the K-factor which acts as a monitor on the reliability of the various parameters involved in the absolute method. The neutron flux and detector efficiency are characterised and flux non-uniformity and detection efficiency for extended sources are discussed through the development of a Monte Carlo technique which enables us to calculate the geometric and effective solid angles subtended by a collimated detector at cylindrical and disc shaped sources or targets. Use of protons with energies ≤ 2 MeV to induce nuclear reactions which emit prompt alpha particles and gamma-rays is applied to the elemental analysis of various matrices. Although this technique is a surface and near surface analysis, it serves to confirm the results obtained by PGNAA as well as to indicate the non-uniformity of the elemental distribution along the sample surface scanned. This is demonstrated for a number of plant samples and a human tooth enamel. Detection of prompt alpha particles emitted necessitates the use of absorber foils to stop the high flux of backscattered protons from reaching the alpha detector. The broadening the introduction of such foils cause to the measured alpha spectra is also experimentally determined.
APA, Harvard, Vancouver, ISO, and other styles
2

Steer, Steven John. "Isomer decay spectroscopy of N<126 neutron-rich nuclei." Thesis, University of Surrey, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493243.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Thomson, Brent Wayne. "Determining the origin and possible mechanisms of QPOS in x-ray emissions of neutron stars and black holes." Thesis, The University of North Dakota, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3681134.

Full text
Abstract:

QPOs (Quasi-Periodic Oscillations) are time oscillations that appear in the light curve of observational data in x-ray bands. They are of mysterious origin although they are believed to be a result of the intense gravity around neutron stars and black holes and emit x-rays from accretion disks. I investigate a derived ratio between two periods has been found in the QPO data. The two periods, which appear as peaks in the power density spectrum have been found to be in a 3:2 ratio and can possibly distinguish theoretical models. In the work presented here, two physical approaches are developed that can explain the integer resonance ratio. One is a cusp layer model, which is based on a boundary layer model that uses the physical conditions at opposite sides of said layer to explore the magnitude of the vertical versus radial epicyclic frequencies and confirm the anticipated scales of the observed frequencies. It also happens to recreate a 3:2 resonance ratio for the Keplerian angular frequencies at the ISCO, taken as the preferred radius for the boundary layer model.

A toy model was recreated and utilized to emulate the Alfven radius due to the accretion disk's innate magnetic field and explore how it serves as a disruption radius and impacts the accretion of mass and the effective inner edge of the disk. The simulations show that there is no significance deviation from the ISCO as an effective inner edge for the accretion disk due to the magnetospheric influence of the disk alone.

I also invoke a parameter to handle the coupling between the vertical and radial epicyclical frequencies and relate it to the pressure within the disk. I show the coupling is strongest at the equatorial plane where pressure is at its maximum value.

A model I utilize is a relativistic resonance model, combined with a helioseismological approach to explore the pulsation of the inner edge of the accretion disk that imparts the resonance of the accreting matter moving along the Kerr space-time orbits. The helioseismological model gives a characteristic frequency for small perturbations in the stellar matter within the atmosphere of a star. The diskoseismological model extends that principle to material within an accretion disk. I take it to the same extent that the QPO frequencies are due to small perturbations along the marginally stable circular orbit, in the vertical and radial directions and use it as a probe into the inner disk and what information it yields. The inner disk edge, per the model, is treated as a vibrating surface that yields the radial and vertical epicyclic frequencies as characteristic features of the vibration. The epicyclical frequencies found using the physical parameters of the model within the cusp layer inside the disk could explain the physical context of the phenomenon responsible for the creation of the QPOs. An approach within the diskoseismological model uses the cylindrical reference frame of a disk in terms of the distribution of mass in combination with the strong gravity of the central object and the Keplerian velocity and sonic speed to yield a natural resonance ratio of 3/2 as well.

The model can be used as a diagnostic tool to explore the physical phenomena of the material orbits and the disk itself. Most importantly, the model can be used to determine and constrain the ratio of spin to mass of the compact object itself. It yields new information as previously undetermined by any earlier model; the adiabatic index at a specific radius within the accretion disk, which serves to lend insight into the innate phenomena of accretion disks at large. It establishes what were previously unknown information, such as the mass density distribution at a specific radius and outward, the radius of influence in terms of the sonic radius, the accretion rate, and the temperature distribution at the same radius for the accretion disk, as all are dependent on the adiabatic index. In all previous literature, the adiabatic index is taken as an assumptive estimate, and the models build on that assumed value of the adiabatic index. This model allows us to obtain an actual value of the adiabatic index at the ISCO and use it as an establishing feature to refine models on for more physically realistic observations.

APA, Harvard, Vancouver, ISO, and other styles
4

Ryan, James. "Measuring the energies and multiplicities of prompt gamma-ray emissions from neutron-induced fission of 235 U using the STEFF spectrometer." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/measuring-the-energies-and-multiplicities-of-prompt-gammaray-emissions-from-neutroninduced-fission-of-235-u-using-the-steff-spectrometer(5fca332e-58ef-463f-96ba-99d87f0ecf44).html.

Full text
Abstract:
Following a NEA high priority nuclear data request, an experimental campaign to measure the prompt Î3-ray emissions from 235 U has been performed. This has used the STEFF spectrometer at the new Experimental Area 2 (EAR2) within the neutron time- of-flight facility (n_TOF), a white neutron source facility at CERN with energies from thermal to approximately 1 GeV. Prior to the experimental campaign, STEFF has been optimised for the environment of EAR2. The experimental hall features a high background Î3-ray rate, due to the nature of the spallation neutron source. Thus an investigation into reduction of the background Î3-ray rate, encountered by the NaI(Tl) detector array of STEFF, has been carried out. This has been via simulations using the simulation package FLUKA. Various materials and shielding geometries have been investigated but the effects determined to be insufficient in reducing the background rate by a meaningful amount. The NaI(Tl) detectors have been modified to improve their performance in a high count rate environment, and their behaviour characterised to understand the response to higher count rates. Initial testing demonstrated that the modified detectors maintain a potential to measure Î3-ray multiplicities up to 3 counts per microsecond. However, the energy resolution fails somewhere below 1.75 counts per microsecond. The experimental campaign has produced a large amount of data. The preliminary analysis of phase one data has considered incoming neutron energies ranging from thermal to an upper limit of 1 eV, with a minimum Î3-ray energy threshold of 160 keV. Results have been achieved for the prompt fission Î3-ray multiplicity and total energy of M Î3 = 6.3 ± 0.2 and E S,Î3 = 9.0 ± 0.1 MeV respectively. Further work is ongoing by the STEFF team at Manchester to improve upon these results and analyse the remainder of the data set at higher incoming neutron energies.
APA, Harvard, Vancouver, ISO, and other styles
5

Snowden, Mareena Robinson. "Nuclear warhead monitoring : a study of photon emissions from fission neutron interactions with high explosives as a tool in arms control verification." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113723.

Full text
Abstract:
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2017.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references.
Since the signing of the Nuclear Nonproliferation Treaty, the technical community has been working to develop verification options that provide confidence in the reduction or elimination of nuclear warheads, while respecting countries' requirement of limited access to national secrets. This dissertation used a simplified open-source warhead model as a vehicle to investigate the use of secondary gammas, generated passively by neutron interactions inside high explosive (HE), as a signature for the presence of a warhead-like object. Analytical calculations were done to estimate the detectability of radiative capture and inelastic scatter emissions generated within the warhead model. Results showed the emission of gammas from nitrogen, between 5-7 MeV, to be detectable above background with dwell-times exceeding 90 minutes. These calculations motivated the systematic study of the signal experimentally using surrogate materials to represent the warhead's weapons-grade plutonium and HE. The experiment did not show the expected signals. This motivated a simulation of the mock-up experiment using the radiation transport code MCNP6 to help understand the observed results. The experimental and simulation data suggest that correlated backgrounds from neutron interactions with environmental materials dominate the signal. This finding helped provide a basis for understanding the feasibility and challenges to detecting this neutron-induced gamma signal. Three sets of pulse-height spectra have been analyzed: experimental spectra that looked at the effect of the HE surrogate on the overall detected counts; simulated spectra that helped to understand the underlying contributors to the observed experimental result; and a data-MCNP6 comparison that assessed the accuracy of the simulated results. Each set contributed to the quantification of detectability for the emissions of interest. The findings suggest the passive detection of the expected high-energy gamma signal is not feasible, unless backgrounds can be better controlled. The difficulty is attributed to low solid-angle coverage of the neutron source by the melamine explosive surrogate, and competing backgrounds produced by neutron-source interactions with surrounding materials. This thesis also examined the benefits and tradeoffs of this particular verification approach by investigating the non-technical context of the verification, such as the preferences of negotiators. The tradeoffs between confidence and intrusiveness highlight the need for technical verification solutions that span the diversity of options. Factors limiting the development of warhead verification systems, from the bias of researchers to issues of classification and sensitive geometries, were discussed.
by Mareena Robinson Snowden.
Ph. D.
APA, Harvard, Vancouver, ISO, and other styles
6

Kundu, Anu. "Contribution of multipolar electromagnetic fields to the radio and high energy emission of pulsars." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE014/document.

Full text
Abstract:
L'étude du champ électromagnétique autour des étoiles à neutrons est l'une des méthodes vitales pour comprendre la physique des pulsars. Alors que la plupart des publications utilisent l'hypothèse d'un champ électromagnétique dipolaire centré standard, des études récentes se sont concentrées sur l'inclusion de composantes de champ multipolaire plus élevées et ont présenté une image plus générale pour les pulsars dans lesquels le moment du dipôle magnétique est décalé du centre de l'étoile. Ce travail discute des conséquences d'un dipôle magnétique rotatif excentré dans le vide en montrant diverses caractéristiques des lignes de champ magnétique et de l'émission de pulsar. Une étude à large bande du spectre du rayonnement pulsar est également présentée par la création de cartes des différentes régions d'émission des pulsars distinguées sur la base de leur fréquence dans le but principal de rechercher l'évolution du profil d'impulsion avec la fréquence. La thèse présente tous les résultats ci-dessus accompagnés des discussions nécessaires pour comprendre les modèles théoriques utilisés et les détails des méthodes numériques appliquées
Studying the electromagnetic field around neutron stars is one of the vital methods to understand the physics of the pulsars. While major literature uses assumption of a standard centred dipolar electromagnetic field, recent studies have focused on including higher multipolar field components and have presented a more generalized picture for pulsars in which the magnetic dipole moment is shifted off from the centre of the star. This work discusses the consequences of an off centred rotating magnetic dipole in vacuum by showing various characteristic features of magnetic field lines and pulsar emission. A broadband spectrum study of pulsar radiation is also laid out by creating maps of different emission regions of pulsars distinguished on the basis of their frequency with the main aim of looking for the evolution of the pulse profile with frequency. The thesis presents all the above results accompanied by the necessary discussions to understand the theoretical models used and the details of the numerical methods applied
APA, Harvard, Vancouver, ISO, and other styles
7

Klimek, Iwona. "Modelling and Measurements of MAST Neutron Emission." Doctoral thesis, Uppsala universitet, Tillämpad kärnfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-282122.

Full text
Abstract:
Measurements of neutron emission from a fusion plasma can provide a wealth of information on the underlying temporal, spatial and energy distributions of reacting ions and how they are affected by a wide range of magneto-hydro-dynamic (MHD) instabilities. This thesis focuses on the interpretation of the experimental measurements recorded by neutron flux monitors with and without spectroscopic capabilities installed on the Mega Ampere Spherical Tokamak (MAST). In particular, the temporally and spatially resolved measurements of the neutron rate measured by the neutron camera, which also possesses spectroscopic capabilities, are combined with the temporally resolved measurements of the total neutron rate provided by the absolutely calibrated fission chamber in order to study the properties of the fast ion distributions in different plasma scenarios. The first part of the thesis describes in detail the two forward modelling methods, which employ the set of interconnected codes developed to interpret experimental observations such as neutron count rate profiles and recoil proton pulse height spectra provided by the neutron camera. In the second part of the thesis the developed methods are applied to model the neutron camera observations performed in a variety of plasma scenarios. The first method, which involves only TRANSP/NUBEAM and LINE2 codes, was used to validate the neutron count rate profiles measured by the neutron camera in three different plasma scenarios covering the wide range of total neutron rate typically observed on MAST. In addition, the first framework was applied to model the changes in the total and local neutron rates caused by fishbone instability as well as to estimate the Hydrogen and Deuterium ion ratio. The second modelling method, which involves TRANSP/NUBEAM, LINE2, DRESS and NRESP, was used to validate the measured recoil proton pulse height spectra in a MHD-quiescent plasma scenario.
APA, Harvard, Vancouver, ISO, and other styles
8

Taverna, Roberto. "Polarized emission from highly-magnetized neutron stars." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424483.

Full text
Abstract:
The study of magnetars, the anomalous X-ray pulsars (AXPs) and the soft gamma repeaters (SGRs), and of X-ray Dim Isolated Neutron Stars (XDINSs) is of particular relevance, since these objects exhibit the strongest magnetic fields ever observed in the universe (10^13-10^15 G) and represent the only laboratories where physics in the presence of such strong magnetic fields can be tested. Until now, these peculiar neutron stars have been investigated through spectroscopic and timing measurements, which led to validate the theoretical models developed to explain their phenomenology, as in the case of the "twisted magnetosphere'' model for magnetars or the different surface emission models for XDINSs. Nevertheless, this kind of analysis alone is far from providing complete information. In this respect, X-ray polarimetry may disclose an entirely new approach in the study of highly magnetized neutron stars. Radiation emitted in the presence of strong magnetic fields, in fact, is expected to be highly polarized; polarization measurements provide two additional observables, the linear polarization fraction and the polarization angle, that can unambiguously determine the model parameters also when spectral analysis alone fails. The polarization signal that an observer at infinity would collect, however, do not necessary coincide with model predictions for the polarization at the surface, due to the effects of quantum electrodynamics in the highly magnetized vacuum around the star, coupled with the rotation of the Stokes parameters in the plane perpendicular to the line of sight, induced by the non-uniform magnetic field. In this thesis I present the results of the numerical codes I developed to simulate the polarization pattern, both at the surface and as observed at infinity, of the radiation emitted from highly magnetized, isolated neutron stars, using as templates the bright AXP 1RXS J170849.0-400910 and the XDINS RX J1856.5-3754. I demonstrate that polarization measurements can indeed provide key information about the physical and geometrical properties of these sources, allowing to directly test theoretical models. This work is also relevant in view of the launch of new-generation X-ray polarimeters, currently under development, like the X-ray Imaging Polarimeter Explorer (XIPE). For this reason, I also compare theoretical models with XIPE simulated observations, in order to show how polarization measurements can be used to extract the values of magnetospheric parameters and viewing angles.
Lo studio delle magnetars, anomalous X-ray pulsars (AXPs) e soft gamma repeaters (SGRs), e delle X-ray Dim Isolated Neutron Stars (XDINSs) è di particolare rilevanza, dal momento che questi oggetti mostrano i più forti campi magnetici mai osservati nell'universo (10^13-10^15 G) e rappresentano i soli laboratori dove la fisica in presenza di campi magnetici così forti può essere testata. Fino ad ora, queste particolari stelle di neutroni sono state studiate attraverso misure spettroscopiche e di timing, che hanno portato a corroborare i modelli teorici formulati per spiegare la loro fenomenologia, come nel caso del "twisted magnetosphere'' model per le magnetars o dei diversi modelli di emissione superficiale per le XDINSs. Cionondimeno, questa analisi da sola non riesce a fornire informazioni complete. A questo riguardo, la polarimetria X può svelare un approccio completamente nuovo nello studio delle stelle di neutroni altamente magnetizzate. La radiazione emessa in presenza di forti campi magnetici, infatti, è attesa essere altamente polarizzata; le misure di polarizzazione forniscono due osservabili aggiuntivi, la frazione di polarizzazione lineare e l'angolo di polarizzazione, che possono determinare senza ambiguità i parametri dei modelli anche quando la sola analisi spettrale si dimostra insufficiente. Il segnale di polarizzazione che un osservatore riceve all'infinito, tuttavia, non coincide necessariamente con ciò che i modelli predicono per la polarizzazione alla superficie, a causa degli effetti dell'elettrodinamica quantistica nel vuoto fortemente magnetizzato attorno alla stella, accoppiato con la rotazione dei parametri di Stokes nel piano perpendicolare alla linea di vista, indotta dal campo magnetico non uniforme. In questa tesi presento i risultati dei codici numerici che ho sviluppato per simulare il pattern di polarizzazione, sia alla superficie che all'infinito, della radiazione emessa da stelle di neutroni isolate altamente magnetizzate, usando come modelli la luminosa AXP 1RXS 170849.0-400910 e la XDINS RX J1856.5-3754. Dimostrerò che le misure di polarizzazione possono effettivamente fornire informazioni cruciali sulle proprietà fisiche e geometriche di queste sorgenti, permettendo di testare direttamente i modelli teorici. Questo lavoro è inoltre rilevante in vista del lancio di polarimetri X di nuova generazione, attualmente in fase di sviluppo, come l'X-ray Imaging Polarimetry Explorer (XIPE). Per questa ragione, confronterò i modelli teorici con osservazioni simulate di XIPE, allo scopo di mostrare come le misure di polarizzazione possono essere utilizzate per estrarre i valori dei parametri relativi alla magnetosfera e gli angoli di vista.
APA, Harvard, Vancouver, ISO, and other styles
9

Chietera, Andreina. "Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE048/document.

Full text
Abstract:
L'objectif de cette thèse est d'explorer les mécanismes d'émission des neutrons émis lors du processus de la fission. En particulier, la question ouverte de l'existence d'une anisotropie dynamique dans le centre de masse des fragments de fission et/ou de la possibilité d'une émission de neutrons de scission est explorée. La thèse débute par une introduction aux concepts théoriques permettant de décrire les processus de fission et les mécanismes d'émission de neutrons. La nécessité de concevoir une méthode d'analyse appropriée pour caractériser des mécanismes très subtiles est discutée, en insistant sur l'importance de maîtriser les biais expérimentaux. Le travail effectué a exigé un effort important de simulation, à travers le développement d'une procédure Monte Carlo pour décrire la fission spontanée du 252Cf, ainsi qu'une modélisation du dispositif expérimental de l'expérience CORA3.Nous proposons pour la première fois une approche simultanée et indépendante des deux mécanismes, émission de scission et anisotropie dynamique, ainsi que des valeurs quantitatives d'anisotropie et d'émission de scission mesurées expérimentalement
The subject of this thesis is to explore the neutron emission mechanisms in the fission process. In particular a long standing open question, the existence of a dynamical anisotropy in the centre of mass of the fission fragments and/or a possible scission neutron emission is explored. The thesis starts with an overview of the theoretical concepts on the fission process and on the neutron emission mechanisms. Also the necessity to conceive an appropriate analysis method is stressed when a very subtle mechanism is studied as various approximations and/or experimental biases not completely handled can hide the physical phenomena. In the presented work a huge effort was required to write a Monte Carlo procedure based on a coherent model for the spontaneous fission of 252Cf and to couple it with the devices exploited in the CORA3 experiment
APA, Harvard, Vancouver, ISO, and other styles
10

GILIBERTI, ELIA. "ON NEUTRON STARS'CRUST BREAKING AND GRAVITATIONAL WAVES EMISSION." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/704603.

Full text
Abstract:
Many different astrophysical events related to pulsars are taught to be due to starquakes, that could be caused by various possible loadings acting on the crust. However, at the present time, there is still a lack of theoretical well based modelling for most of these loadings and, therefore, we have only a very rough knowledge of the physics of neutron stars’ crust response. This PhD work wants to be a first development of a quite realistic calculation of the effects of chosen loadings, being that the forces due to uniform rotation, differential rotation or pinning, on the crust of pulsars. A Newtonian model, already used in Geophysics, has been adapted to the very different physical conditions of neutron stars’ physics and used to describe self-gravitating neutron stars, both in the incompressible and compressible scenario, subjected to different kinds of loadings. In particular, the deformations due to uniform rotation, differential rotation and slack pinning are studied. It is found that the response of the star is very sensitive to the adiabatic index value, while it is weakly influenced by the stellar mass. In all the cases, the strain developed between two glitches is found to be insufficient to break the crust, a result that challenges the standard picture of pulsar glitches based on crustquakes. Finally, attention is focused on accreting neutron stars in low-mass X-ray binaries and millisecond pulsars. The scenario is the following: the star spins up due to the accretion of matter thus building up stress; the mass quadrupole moment associated with crustal failures leads to the emission of gravitational waves which, in turn, spins down the star until equilibrium. The equilibrium frequency calculated is found compatible with observations. It is also argued that these gravitational waves could be potentially detected by the LIGO-Virgo interferometers in the near future.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Neutron emissions"

1

Carpinteri, Alberto, Giuseppe Lacidogna, and Amedeo Manuello, eds. Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Norbury, John W. Calculation of two-neutron multiplicity in photonuclear reactions. Hampton, Va: Langley Research Center, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Inferences from Surface Thermal Emission of Young Neutron Stars. [New York, N.Y.?]: [publisher not identified], 2020.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

J, Hughes M., Cowell Michael, Hook Duncan R, and British Museum. Dept. of Scientific Research., eds. Neutron activation and plasma emission spectrometric analysis in archaeology: Techniques and applications. London: British Museum, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Howarth, P. J. A. The JET neutron emission profile diagnostic: Data exploitation and the development of an upgraded version. Birmingham: University of Birmingham, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Hartmann, Dap. The Leiden/Dwingeloo survey of galactic neutral hydrogen. Leiden: Sterrewacht Leiden, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Hartmann, Dap. The Leiden/Dwingeloo survey of galactic neutral hydrogen. Leiden: Sterrewacht Leiden, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Civiš, Svatopluk, Ekaterina Zanozina, Adam Pastorek, Petr Kubelík, Martin Ferus, and Ashok Chilukoti. Atomic Emission Spectra of Neutral Noble Gases in the Infrared Spectral Range. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47352-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Nanda, Rea, and SpringerLink (Online service), eds. High-Energy Emission from Pulsars and their Systems: Proceedings of the First Session of the Sant Cugat Forum on Astrophysics. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

R, Cominsky Lynn, and United States. National Aeronautics and Space Administration., eds. ROSAT observations of the binary Be-star/radio pulsar PSR1259-63: Final technical report for NASA NAG 5-1684. [Washington, DC: National Aeronautics and Space Administration, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Neutron emissions"

1

Manuello, A., R. Malvano, O. Borla, A. Palumbo, and A. Carpinteri. "Neutron Emissions from Hydrodynamic Cavitation." In Fracture, Fatigue, Failure and Damage Evolution, Volume 8, 175–82. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21611-9_22.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Borla, Oscar, Giuseppe Lacidogna, and Alberto Carpinteri. "Piezonuclear Neutron Emissions from Earthquakes and Volcanic Eruptions." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 135–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Carpinteri, Alberto. "TeraHertz Phonons and Piezonuclear Reactions from Nano-scale Mechanical Instabilities." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 1–10. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Carpinteri, Alberto, Giuseppe Lacidogna, and Oscar Borla. "Is the Shroud of Turin in Relation to the Old Jerusalem Historical Earthquake?" In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 153–62. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Carpinteri, Alberto, and Amedeo Manuello. "Evolution and Fate of Chemical Elements in the Earth’s Crust, Ocean, and Atmosphere." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 163–81. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Carpinteri, Alberto, Amedeo Manuello, and Luca Negri. "Chemical Evolution in the Earth’s Mantle and Its Explanation Based on Piezonuclear Fission Reactions." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 183–96. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_13.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Carpinteri, Alberto, Amedeo Manuello, and Luca Negri. "Piezonuclear Fission Reactions Triggered by Fracture and Turbulence in the Rocky and Gaseous Planets of the Solar System." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 197–218. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Cook, Norman D., Amedeo Manuello, Diego Veneziano, and Alberto Carpinteri. "Piezonuclear Fission Reactions Simulated by the Lattice Model of the Atomic Nucleus." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 219–35. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Niccolini, Gianni, Oscar Borla, Giuseppe Lacidogna, and Alberto Carpinteri. "Correlated Fracture Precursors in Rocks and Cement-Based Materials Under Stress." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 237–48. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Accornero, Federico, Stefano Invernizzi, Giuseppe Lacidogna, and Alberto Carpinteri. "The Sacred Mountain of Varallo Renaissance Complex in Italy: Damage Analysis of Decorated Surfaces and Structural Supports." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 249–64. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Neutron emissions"

1

KEENEY, F. W., S. E. JONES, A. C. JOHNSON, P. L. HAGELSTEIN, G. HUBLER, D. B. BUEHLER, F. E. CECIL, M. R. SCOTT, and J. E. ELLSWORTH. "NEUTRON EMISSIONS FROM DEUTERIDED METALS." In Proceedings of the 10th International Conference on Cold Fusion. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701510_0045.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Celik, C., R. O’Mara, and W. Wieselquist. "Monte Carlo Uncertainty Quantification in UF6 Cylinder Neutron Emissions." In Tranactions - 2019 Winter Meeting. AMNS, 2019. http://dx.doi.org/10.13182/t31282.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Gupta, Sanjib S., A. Heger, P. Möller, T. Kawano, Jutta Escher, Frank S. Dietrich, Toshihiko Kawano, and Ian J. Thompson. "Electron Capture-delayed neutron-emissions in neutron star crust simulations using a Hauser-Feshbach model." In COMPOUND-NUCLEAR REACTIONS AND RELATED TOPICS: Proceedings of the 2007 International Workshop on Compound-Nuclear Reactions and Related Topics - CNR∗ 2007. AIP, 2008. http://dx.doi.org/10.1063/1.2920735.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Jones, S. E., D. Bennion, D. Buehler, J. B. Czirr, D. L. Decker, J. Harb, R. Hunter, et al. "In quest of a trigger mechanism for neutron emissions from deuterium/solid systems." In Anomalous nuclear effects in deuterium/solid systems. AIP, 1991. http://dx.doi.org/10.1063/1.40694.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Golubnichyi, P. I., A. D. Philonenko, A. A. Tsaric, V. V. Kuzminov, B. V. Pritichenko, G. I. Merzon, and V. A. Tsarev. "Recording of neutron and acoustic emissions from palladium target in a low background underground experiment." In Anomalous nuclear effects in deuterium/solid systems. AIP, 1991. http://dx.doi.org/10.1063/1.40715.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Jeong, Han Koo, and Soo Hyoung Kim. "Effect of Marine Nuclear Reactor Environment to Ship’s Structural Responses." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62600.

Full text
Abstract:
Abstract As the regulations on greenhouse gas emissions at sea become strict, technology development to minimize environmental pollutants emitted from the propulsion system of ships is actively underway. Research on the use of renewable energy as a power source of ships propulsion system pursuing eco-friendliness is continuously carried out. However, considering the recent development of ships’ large-scale, and at the same time minimizing greenhouse gas emissions at sea, the interest in nuclear energy as the means of a stable supply of environmentally friendly large-capacity energy has been increased. In this study, the effect of marine reactor operation on the material properties of a ship hull material is reviewed, and from this, hull structural behaviors are investigated. Attention is paid to the neutron irradiation on the material in the reactor operation environment, and then the strength assessment of a hull structural member assumed in the neutron irradiation situation is performed. Considering the neutron irradiation effects, the Young’s modulus, poisson’s ratio and allowable stress of DH36, typical high tensile strength steel used in ship hull, are varied based on the research findings related with the topic of neutron irradiated steels. Rectangular stiffened plated structures, basic common structural members for ship hull, are exemplified for the strength assessment to understand their structural behaviors such as strength and stiffness. Results from this study provide information on the effect of neutron irradiation on the hull structural behaviors of the ship using nuclear power and possibly can supplement the hull structure part from classification societies’ rules and regulations.
APA, Harvard, Vancouver, ISO, and other styles
7

YAKOVLEV, D. G., M. E. GUSAKOV, A. D. KAMINKER, and A. Y. POTEKHIN. "NEUTRINO EMISSION FROM NEUTRON STARS." In Proceedings of the Carpathian Summer School of Physics 2005. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772862_0024.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Acevedo, Wilson, Luis Gaitan, Andrés Julián Aristizábal, and Daniel Ospina. "Study of the effect on greenhouse gas emissions of vehicles powered by hydrogen generators." In XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5116941.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Andriyash, A. V. "Investigation of Neutron Emissions from D(d,n)3He and T(d,n)4He Reactions in a 10 TW Picosecond Laser Facility SOKOL-P." In ZABABAKHIN SCIENTIFIC TALKS - 2005: International Conference on High Energy Density Physics. AIP, 2006. http://dx.doi.org/10.1063/1.2337173.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Frankfurt, Leonid, Mark Strikman, Sigfrido Boffi, Claudio Ciofi degli Atti, Mauro Giannini, and Daniele Treleani. "Short-range nucleon correlations and neutrino emission by neutron stars." In SIXTH INTERNATIONAL CONFERENCE ON PERSPECTIVES IN HADRONIC PHYSICS. AIP, 2008. http://dx.doi.org/10.1063/1.3013048.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Neutron emissions"

1

Kocharov, L. G., Jeongwoo W. Lee, H. Zirin, G. A. Kovaltsov, and I. G. Usoskin. Neutron and Electromagnetic Emissions During the 1990 May 24 Solar Flare,. Fort Belvoir, VA: Defense Technical Information Center, December 1996. http://dx.doi.org/10.21236/ada319276.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Epstein, R. I., B. C. Edwards, and T. J. Haines. Neutron star evolution and emission. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/515633.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Strachan, J., M. Bell, M. Bitter, R. Budny, R. Hawryluk, K. Hill, H. Hsuan, et al. Neutron emission from TFTR supershots. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/6946572.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Strachan, J. D., M. G. Bell, M. Bitter, R. Budny, R. Hawryluk, K. W. Hill, H. Hsuan, et al. Neutron emission from TFTR supershots. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10184799.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Litz, Marc, Christopher Waits, and Jennifer Mullins. Neutron-Activated Gamma-Emission: Technology Review. Fort Belvoir, VA: Defense Technical Information Center, January 2012. http://dx.doi.org/10.21236/ada554870.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Park, H. K., M. G. Bell, W. M. Tang, G. Taylor, and M. Yamada. Role of neutral-beam fueling profile in energy confinement and neutron emission on TFTR. Office of Scientific and Technical Information (OSTI), October 1993. http://dx.doi.org/10.2172/10189872.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Shores, Erik Frederick. Tabulated Neutron Emission Rates for Plutonium Oxide. Office of Scientific and Technical Information (OSTI), July 2017. http://dx.doi.org/10.2172/1372807.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Pellarin, D. J. (a, n) Neutron Emission from DWPF Glass. Office of Scientific and Technical Information (OSTI), March 2001. http://dx.doi.org/10.2172/780500.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Goldberg, E., L. F. Hansen, R. J. Howerton, T. T. Komoto, and B. A. Pohl. HOTSPUR: Neutron and gamma-ray emission from the transport of 14 MeV neutrons through H/sub 2/O. Office of Scientific and Technical Information (OSTI), May 1987. http://dx.doi.org/10.2172/6319434.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Madland, D. G. Post-scission fission theory: Neutron emission in fission. Office of Scientific and Technical Information (OSTI), November 1997. http://dx.doi.org/10.2172/548904.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Neutron emissions' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography