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Littérature scientifique sur le sujet « Single beta decay »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Single beta decay"

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Díaz, Jorge S. « Tests of Lorentz Symmetry in Single Beta Decay ». Advances in High Energy Physics 2014 (2014) : 1–7. http://dx.doi.org/10.1155/2014/305298.

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Low-energy experiments studying single beta decay can serve as sensitive probes of Lorentz invariance that can complement interferometric searches for deviations from this spacetime symmetry. Experimental signatures of a dimension-three operator for Lorentz violation which are unobservable in neutrino oscillations are described for the decay of polarized and unpolarized neutrons as well as for measurements of the spectral endpoint in beta decay.
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Krmpotić, F., J. Hirsch et H. Dias. « Double-beta decay within a single-mode model ». Nuclear Physics A 542, no 1 (juin 1992) : 85–96. http://dx.doi.org/10.1016/0375-9474(92)90398-4.

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Kohyama, Y., K. Kubodera et K. Yazaki. « Comment on neutrinoless double-beta decay between pairs of single-beta emitters ». Physics Letters B 168, no 1-2 (février 1986) : 21–25. http://dx.doi.org/10.1016/0370-2693(86)91452-8.

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MATSUDA, KOICHI, TATSURU KIKUCHI, TAKESHI FUKUYAMA et HIROYUKI NISHIURA. « CONSTRAINTS FROM NEUTRINOLESS DOUBLE BETA DECAY ». Modern Physics Letters A 17, no 39 (21 décembre 2002) : 2597–603. http://dx.doi.org/10.1142/s0217732302009362.

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We examine the constraints from the recent HEIDELBERG–MOSCOW double beta decay experiment. It leads us to the almost degenerate or inverse hierarchy neutrino mass scenario. In this scenario, we obtain possible upper bounds for the Majorana CP violating phase in the lepton sector by incorporating the data from the neutrino oscillation, the single beta decay experiments, and from the astrophysical observation. We also predict the neutrino mass that may be measurable in the future beta decay experiments.
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Borzov, I. N. « Evolution of single-particle structure and beta-decay near78Ni ». EPJ Web of Conferences 38 (2012) : 12002. http://dx.doi.org/10.1051/epjconf/20123812002.

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Skalsey, M. « Feasibility of detecting neutrinoless double-beta decay between pairs of single-beta emitters ». Physical Review C 36, no 2 (1 août 1987) : 820–21. http://dx.doi.org/10.1103/physrevc.36.820.

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Severyukhin, A. P., N. N. Arsenyev, I. N. Borzov, R. G. Nazmitdinov et S. Åberg. « Two-phonon structures for beta-decay theory ». EPJ Web of Conferences 194 (2018) : 02008. http://dx.doi.org/10.1051/epjconf/201819402008.

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The β-decay rates of 60Ca have been studied within a microscopic model, which is based on the Skyrme interaction T45 to construct single-particle and phonon spaces. We observe a redistribution of the Gamow–Teller strength due to the phonon-phonon coupling, considered in the model. For 60Sc, the spin-parity of the ground state is found to be 1+. We predict that the half-life of 60Ca is 0.3 ms, while the total probability of the βxn emission is 6:1%. Additionally, the random matrix theory has been applied to analyze the statistical properties of the 1+ spectrum populated in the β-decay to elucidate the obtained results.
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Kohyama, Y., K. Kubodera et M. Takizawa. « Comment on ‘‘Feasibility of detecting neutrinoless double-beta decay between pairs of single-beta emitters’’ ». Physical Review C 37, no 4 (1 avril 1988) : 1778–79. http://dx.doi.org/10.1103/physrevc.37.1778.

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Lenske, Horst. « Heavy Ion Charge Exchange Reactions as Probes for Beta–Decay ». EPJ Web of Conferences 223 (2019) : 01031. http://dx.doi.org/10.1051/epjconf/201922301031.

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Peripheral heavy ion single and double charge reactions are described by fully quantum mechanical distorted wave methods. A special class of nuclear double charge exchange (DCE) reactions proceeding as a one-step reaction through a two-body process are shown to proceed by nuclear matrix elements of a diagrammatic structure as found also in 0ν2ß decay. These hadronic Majorana-type DCE reactions (MDCE) have to be distinguished from second order DCE reactions, given by double single charge exchange (DSCE) processes, resembling 2ν2ß decay. The theoretical concepts of MDCE are discussed. First results show that ion-ion DCE reactions are the ideal testing grounds for investigations of rare second order nuclear processes, giving insight into nuclear in-medium two-body correlation.
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Moreno, O., R. Álvarez-Rodríguez, P. Sarriguren, E. Moya de Guerra, F. Šimkovic et A. Faessler. « Single- and low-lying-states dominance in two-neutrino double-beta decay ». Journal of Physics G : Nuclear and Particle Physics 36, no 1 (31 octobre 2008) : 015106. http://dx.doi.org/10.1088/0954-3899/36/1/015106.

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Thèses sur le sujet "Single beta decay"

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Pacearescu, Larisa. « Single and double beta decay in deformed nuclei ». [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972080406.

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Szwec, Stuart V. « Transfer reaction studies of medium mass nuclei-single-particle occupancies and neutrinoless double beta decay ». Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/transfer-reaction-studies-of-medium-mass-nuclei--singleparticle-occupancies-and-neutrinoless-double-beta-decay(6120c9fe-c85d-42fd-908f-e07e07cccd50).html.

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Two separate investigations are presented, both linked by a common interest in the occupancy of the valence neutron orbitals and their relation to nuclear structure studies. A study of the change in neutron occupancy in the 0Î1⁄22Î2 decay of 136 Xe → 136 Ba has been performed. The neutron occupancies of 136 Ba have been probed us- ing the (p,d) and ( 3 He,α) neutron-removal reactions and the (d,p) and (α, 3 He) neutron-addition reactions, performed at the Institut Physique Nucl ́eaire, Orsay. The same reactions have been performed on 134 Ba as an additional consistency check. Spectroscopic factors were extracted through a DWBA analysis and the valence orbital occupancies were extracted using the Macfarlane and French sum rules. The change in neutron occupancy that occurs during 0Î1⁄22Î2 decay was then determined and compared to those calculated by using the interacting shell model and the interacting boson model. The comparison showed that while the various models were able to qualitatively describe the change in occupancy, quantitatively there are significant differences between the models. These are the same models that are used to determine the nuclear matrix elements used in determining the rate of 0Î1⁄22Î2 decay. An additional systematic study of the valence neutron occupancies on the seven even stable tin isotopes is presented. The occupancies were probed in two sets of experiments. The first measurement used the low Q-value (p,d) and (d,p) reactions performed at the Maier-Leibnitz-Laboratory, Munich, to extract spec- troscopic information for low-j orbitals. The second measurement used the high Q-value ( 3 He,α) and (α, 3 He) reactions at the Institut Physique Nucl ́eaire, Orsay to extract spectroscopic information for high-j states. Absolute cross sections were determined and the amount transferred angular momenta was identified by comparison of angular distributions to those calculated using a DWBA analysis. The spectroscopic factors were used in conjunction with the Macfarlane-French sum rules to determine the valence neutron occupancies. These measurements not only qualitatively test the robustness of sum rules in transfer reactions but also provide information about the neutron occupancy of 116 Sn and 124 Sn, two nu- clei of relevance to 0Î1⁄22Î2 decay. The measured occupancies of these two isotopes were compared to those obtained from recent theoretical calculations.
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Bellone, Jessica Ilaria. « Determination of the link between heavy ion charge exchange reactions and single and double beta decay matrix elements ». Doctoral thesis, Università di Catania, 2019. http://hdl.handle.net/10761/4119.

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We performed theoretical studies on Heavy ion charge exchange reactions, at low energies, focusing on the interplay between nuclear structure and reaction dynamics. Such studies allow also to enlight the existence of a relation between Heavy ion double charge exchange (HIDCE) cross section at forward scattering angles and double beta ($\beta\beta$) decay nuclear matrix element (NME) of the target or projectile nucleus considered. HIDCE reactions can be described as a sequence of two single charge changing processes, which can be correlated or not, thus mimicking $0\nu\beta\beta$ and $2\nu\beta\beta$ decays, respectively. The dominance of the former mechanism would allow to gain information on $0\nu\beta\beta$ NME, thus in turn allowing to determine neutrino Majorana mass with a significant accuracy, if such weak decay were observed.
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FERRI, ELENA. « An experiment for the direct calorimetric measurement of the neutrino mass ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/29502.

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The oscillation experiments have clearly shown that neutrino are massive particle. Nowadays the experiments based on kinematic analysis of electrons emitted in nuclear beta-decay are the most sensitive for a direct electron-neutrino mass determination. The method consists in searching for a tiny deformation caused by a non-zero neutrino mass to the spectrum of the charged particles emitted near the end point. A possible approach is the calorimetric one. In a calorimetric measurement the source is embedded in the detector and all the energy is measured, except for the one taken away by the neutrino. A drawback of this approach is that the full spectrum is acquired, while only the decays very close to the end-point are useful for measuring the neutrino mass. Therefore, the source activity has to be limited to avoid pile-up which would deform the shape of beta spectrum. As a consequence the statistics near the end-point is limited as well. This limitation may be then partially balanced by using isotopes with an end-point energy as low as possible. In this scenario an international collaboration has grown around the project of Microcalorimeter Arrays for a Rhenium Experiment (MARE) for a direct calorimetric measurement of the neutrino mass with sub-electronvolt sensitivity. Although the baseline of the MARE project consists in a large array of rhenium based thermal detectors, a different option for the isotope is also being considered. The two competing isotopes are 187Re and 163Ho. While the first beta decays, the latter decays via electron capture, and both have a Q value around 2.5 keV. The MARE project has a staged approach. The first phase of the project (MARE-1) is a collection of activities with the aim of sorting out both the best isotope and the most suited detector technology to be used for the final experiment. The goal of the last phase (MARE-2) is to achieve a sub-eV sensitivity on the neutrino mass. It will deploy several arrays of thermal microcalorimeters. During my Ph.D I have focused only on the rhenium isotope, neglecting the holmium. In fact, in the case of rhenium I have estimated the statistical sensitivity of a neutrino mass experiment performed with thermal calorimeters. First, through an analytical approach, I have derived an algorithm to assess the statistical sensitivity for a given experimental configuration and then, for the same experimental configuration, I have estimated the sensitivity on neutrino mass via a Montecarlo method. The results of the analytic approach are then validated through the comparison with the Montecarlo results over a wide range of experimental parameters. The investigation is carried out for both phases of the MARE experiment. For example, the Montecarlo approach has shown that a neutrino mass sensitivity of 0.1 eV at 90% CL could be expected in 10 years running 3x10^5 detectors, each with a mass of 10 mg (~10 Hz) and with energy and time resolutions of about 1 eV and 1 μs respectively. Instead, a sensitivity on neutrino mass of 3.4 eV at 90% CL could be achieved in 3 years using 288 detectors, each with a mass of 500 μg (~ 0.3 Hz) and with energy and time resolutions of about 30 eV and 300 μs respectively. The latter is the configuration of the Milano MARE-1 experiment, which is one of the MARE-1 activities. Subsequently, I have exploited the Montecarlo approach to study the main sources of systematic uncertainties of the calorimetric experiments, as the shape of the beta spectrum and the Beta Environmental Fine Structure (BEFS), which is a modulation of the beta spectrum due to the atoms surrounding the decaying nuclei. The systematics uncertainties relating to the source (i.e. excited final states and the escape electron) have been also investigated. Finally, I have evaluated the capability of the MARE experiment to measure the mass of heavy neutrinos from some tens of eV to 2.5 keV. I have also participated in the Milano MARE-1 experiment. This experiment is carried out in Milano by the group of Milano--Bicocca in collaboration with NASA/GSFC and Wisconsin groups. The Milano MARE-1 arrays are based on semiconductor thermistors, provided by the NASA/GSFC group, with dielectric silver perrhenate absorbers, AgReO4. These arrays consist of 6 x 6 implanted Si:P thermistors on which single crystal of AgReO4 are attached. The mass of a single absorber is around 500 μg, corresponding to a single detector rate of 0.3 Hz. The cryogenic set-up of MARE-1 is designed to host up to 8 arrays (i.e. 288 detectors), but the installation of only two arrays has been funded so far. The read-out electronics of MARE-1 in Milano is characterized by a cold buffer stage, based on JFETs which work at about 120 K, followed by an amplifier stage at room temperature. To electrically connect the detector at 85 mK to the JFETs at 120 K two decoupling stages are needed. The two stages have also to guarantee the mechanical stability. The first stage separates the detectors from the JFETs box, while the second one decouples the cold electronics box from the JFETs. In this context, the activities I have carried out were focused primarily on the assembly of the entire cryogenic set-up of MARE-1 in Milano and then on its analysis and improvement. Firstly, I have performed several cool-downs devoted to test the detector performances and to determinate the best thermal coupling between Si thermistors and AgReO4 absorbers, in conclusion of which we have obtained an energy resolution of around 30 eV at 2.6 keV and a rise time of about 300 μs. With 72 detectors and such performances, a sensitivity on neutrino mass of 4.7 eV at 90% C.L. is expected in three years running time. During these cool-downs it was used the electronics of the MIBETA experiment, the predecessor of the MARE-1 experiment in Milano. Since its first installation the cryogenic set-up of MARE-1 has presented several structural and thermal problems. The first has concerned the electrical connections between the detectors and electronics, while the latter the insufficient thermal decoupling between the JFETs support and the cold electronic box as well as the insufficient thermalization of the array ceramic board and of the array itself. As a consequence, no signal could be acquired. Therefore, I have performed an R&D work in order to solve all of these problems in conclusion of which the detectors have reached a base temperature such that it was possible to acquire a first spectrum with a threshold below 800 eV. In this condition, an energy resolution of 175 eV at 1.5 keV and of 181 eV at 5.9 keV have been obtained, while the rise time was about 850 μs. It was the first time that a spectrum with this threshold was acquired with the MARE-1 set-up. The worsening observed in the detectors performances with respect to the test runs was due to an excessive microphonics noise. Nevertheless it can be hypothesized that a 72 channels measurement will be starting soon.
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Pacearescu, Larisa [Verfasser]. « Single and double beta decay in deformed nuclei / vorgelegt von Larisa Pacearescu ». 2004. http://d-nb.info/972080406/34.

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Livres sur le sujet "Single beta decay"

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Visweswara Rao, Pasupuleti, Balam Satheesh Krishna et Mohammad Saffree Jeffree, dir. Coronaviruses Transmission, Frontliners, Nanotechnology and Economy. UMS Press, 2022. http://dx.doi.org/10.51200/coronavirusesdrraoums2021.

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Coronaviruses are the viruses which cause different types of diseases in humans and animals. They belong to Coronaviridae family. Coronaviruses have unique shape which consists of spiked rings and sometimes to deal with them is a tough task. They are the tiny organisms which can only be seen under the microscopes. Even though the corona viruses exist in nature since decades, however the seriousness is only seen with the pandemic SARS-CoV II or COVID-19. It has taken so many lives away and the loss of various businesses. Keeping in view these situations, the authors and editors try to bring few of the important aspects together and compiled this book. The transmissions occur through different means and the vaccines are under production by various giant companies. Second chapter deals with animals as sources of transmitting agents to spread corona virus. Up to date the Centre for Disease Control and Prevention (CDC) recognizes 7 species of coronaviruses that infect humans, with the earliest known species identified in the mid-1960s. The known human coronaviruses are 229E (alpha coronavirus), NL63 (alpha coronavirus), OC43 (beta coronavirus), HKU1 (beta coronavirus), MERS-CoV (causes Middle East Respiratory Syndrome, MERS), SARS-CoV (causes Severe Acute Respiratory Syndrome, SARS) and SARS-CoV-2 (causes the coronavirus disease also in 2019, also known as COVID-19). Third chapter dealt with risk assessment for front liners during COVID-19 pandemic and clearly explained about the risk assessment factors. Healthcare workers (HCWs) are on the frontline of treating patients infected with COVID-19. However, data related to its infection rate among HCWs are limited. Chapter 4 deals with the nanotechnology and its applications on viral diseases. Nanobiotechnology is science of nanoparticle synthesis by using biotechnological applications in biology, physics, engineering, drug delivery, diagnostics, and chemistry. The use of metal/ polymeric nanoparticles as drug delivery systems has become extensive in last two decades. The commercialization of developed novel nanoparticles/drug loaded polymeric nanoparticles delivery systems are required to eradicate virus with improved safety measures in the humans with affordable cost. Chapter 5 mainly focused on the impact of COVID -19 on China, Malaysia, Indonesia, and India. The outbreak of the Covid-19 pandemic is an unprecedented shock to the Emerging economies. The evidence reported in various studies indicates that epidemic disease impacts on a country's economy through several channels, including the health, transportation, agricultural and tourism sectors. In the chapter 6, the authors discussed the psychological response, ranges from adaptive to maladaptive spectrum. We wish to express our gratitude to all the authors and contributors from Malaysia, Indonesia, and India for readily accepting our invitation and timely contributions without any delay. We greatly appreciate their commitment. We also thank Universiti Malaysia Sabah and Universitas Abdurrab for the great collaboration and collaborative efforts.
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Chapitres de livres sur le sujet "Single beta decay"

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Alenkov, A., O. Buzanov, A. Dosovitskii, V. Kazalov, V. Kornoukhov et A. Mikhlin. « Enriched 40Ca100MoO4 Single Crystalline Material for Search of Neutrinoless Double Beta Decay ». Dans Springer Proceedings in Physics, 113–24. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21970-3_9.

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Oriakhi, Christopher O. « Radioactivity and Nuclear Reactions ». Dans Chemistry in Quantitative Language. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780195367997.003.0028.

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Nuclide: an atom containing a specified number of protons and neutrons in its nucleus—in other words, any particular atom under discussion. Unstable nuclide: one that will spontaneously disintegrate or emit radiation, thus giving off energy and altering to some new form (often another element). The new form may also be unstable; often it will be stable, that is, with no tendency to disintegrate. Unstable nuclides are also referred to as radioactive. Radioactivity: the spontaneous emission of radiation by elements with unstable nuclei. Radionuclide: a radioactive (that is, unstable) nuclide. Radioisotope: another more commonly seen term for radionuclide. Radioactive decay: the process whereby a radionuclide is converted to another form (usually another element) by emitting radiation. Parent nuclide: a nuclide undergoing radioactive decay. Daughter nuclide: the nuclide produced when a parent nuclide decays. Activity: the rate at which a sample of the material decays, usually expressed as the number of disintegrations per unit time. Naturally radioactive elements decay spontaneously by emitting alpha particles, beta particles, and gamma radiation. Other elements can be induced to decay by bombarding them with high-energy particles; this is known as artificial radioactivity. Like chemical reactions, equations representing nuclear reactions must be balanced. However, the method for balancing nuclear equations differs from that used for chemical equations. To balance a nuclear equation, the sum of the atomic numbers or particle charges (subscripts) and the sum of the mass numbers (superscripts) on both sides of the equation must be equal. When a nucleus undergoes alpha decay, it emits a particle that is identical to a helium nucleus, with an atomic number of 2 and a mass number of 4. Since the emission of an alpha particle from the nucleus results in a loss of 2 protons and 2 neutrons, when writing a nuclear reaction involving an alpha decay, subtract 4 from the mass number and 2 from the atomic number.
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Kilcullen, David. « Ebb Tide of the West ». Dans The Dragons and the Snakes, 216–50. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190265687.003.0008.

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This chapter explores the declining efficacy of the Western military model since 2003, canvasses various strategic responses to it—including doubling down on the current approach, embracing decline, and “going Byzantine”—and recommends a strategy of strategic delay. It argues that the high point of Western military dominance in the post–Cold War era—the “high tide of the West”—coincided with the failed decapitation strike against Saddam Hussein in March 2003, and that since then Western powers have acted as if they were still in a Woolseyan security environment (where the principal threats originated from weak states, failing states and nonstate actors) when actually the environment was post-Woolseyan; that is, characterized by a return of state-based threats and great-power military competition. The chapter considers three possible responses to this problem, evaluates their strengths and weaknesses, and concludes that our best bet (though by no means a certain solution) is to play for time, adopt a light footprint offshore balancing strategy, and attempt to create space for a potentially acceptable successor order to emerge.
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Actes de conférences sur le sujet "Single beta decay"

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de Guerra, E. Moya, R. Alvarez-Rodríguez, O. Moreno, P. Sarriguren, Osvaldo Civitarese, Ivan Stekl et Jouni Suhonen. « Single state dominance and other issues relevant to DBDME ». Dans WORKSHOP ON CIRCULATION OF DOUBLE-BETA-DECAY MATRIX. AIP, 2009. http://dx.doi.org/10.1063/1.3266107.

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Fiorini, Ettore. « SINGLE AND DOUBLE BETA DECAY WITH THERMAL DETECTORS ». Dans The Proceedings of the International Symposium on Nuclear Electro-Weak Spectroscopy for Symmetries in Electro-Weak Nuclear-Processes. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776754_0012.

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Babič, A., D. Štefánik, M. I. Krivoruchenko et F. Šimkovic. « Double-beta decay with emission of single free electron ». Dans PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17) : Sustainable Technology And Practice For Infrastructure and Community Resilience. Author(s), 2017. http://dx.doi.org/10.1063/1.5007626.

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Mueller, W. F., B. Bruyneel, S. Franchoo, M. Huyse, U. Köster, K. L. Kratz, K. Kruglov et al. « Beta decay of neutron-rich Co : Probing single-particle states at and above the N=40 subshell closure ». Dans Nuclear structure 98. AIP, 1999. http://dx.doi.org/10.1063/1.59515.

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Zuber, Kai, Osvaldo Civitarese, Ivan Stekl et Jouni Suhonen. « Updates on activities since the Durham meeting and status of the COBRA experiment ». Dans WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX'07). AIP, 2007. http://dx.doi.org/10.1063/1.2805111.

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Winkler, Christoph, Stefan Wo¨rlen, Stefan Thierfeldt et Frank Schartmann. « Development of a Computer System for Support and Documentation of Clearance of Buildings of Nuclear Installations ». Dans ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59278.

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Clearance of buildings of nuclear installations in Germany has to comply with general requirements laid down in Section 29 of the German Radiation Protection Ordinance (RPO; Strahlenschutzverordnung), clearance levels as stipulated in Table 1 of Annex III RPO and technical guidance given in the technical standard DIN 25457. Clearance procedures are usually proposed by the licensee and are made part of a decommissioning licence after appropriate review by the authorities. The clearance procedures consist of a radiological characterisation of the various parts of the buildings, a decontamination step if necessary, followed by measurements for checking the success of decontamination, and the actual decision measurements for demonstrating compliance with clearance levels. These three steps rely on various measurement methods, selected depending on the relevant radionuclides to be measured, like sampling with subsequent gamma spectrometry (and if necessary separate evaluation of beta and alpha emitting nuclides), measurements with surface contamination monitory and in situ gamma spectrometry. For a nuclear power plant, the number of samples taken during this procedure can easily reach a few 10,000, while the number of single measurements can reach several 100,000 single surface measurements and several 10,000 measurements with in situ gamma spectrometry. This large number of data together with the correct interpretation according to the valid nuclide vector, the penetration depth of the contamination, the correction for radioactive decay etc have to be managed, which is a error-prone process if carried out manually or with insufficient support by customised software. For this reason, a versatile software tool has been developed by Brenk Systemplanung GmbH that supports the operator in all aspects of clearance of buildings, based on the extensive experience with various clearance procedures in nuclear power plants that Brenk Systemplanung has carried out in the past. Many steps of the data evaluation and report generation during the clearance process outlined above can now be carried out automatically. This includes the time-consuming steps of: • support during the acquisition of the geometry data for a room, • generation of the lists for sampling and measurements, • automatic acquisition of the measurement and sampling results from the instruments, • evaluation of compliance with clearance levels, both for measurements on the entire surface and for statistically distributed measurements or samples, • generation of the documentation on clearance, • storage of all data, generation of nuclide vectors, correction for radioactive decay, connection with photo, CAD drawings etc.
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Yoon, Tai Hyun, Ho Suhng Suh, Jae Heung Jo et Yong-Pyung Kim. « Linewidth measurement of a single-mode Ti:AI2O3 ring laser ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wf4.

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A linewidth of 80 kHz and a frequency jitter of 900 kHz of a free-running single-mode Ti:Al2O3 ring laser was measured by using optical homodyne and heterodyne measurement methods. A single-mode 1km optical fiber was used for a 5-μs optical phase delay at 780 nm. Single-mode output of the home-made Ti:Al2O3 ring laser could be tuned between 730-820 nm and the average output power was 300 mW. In the homodyne optical spectrum a oscillation with period of 1/τ (=190 kHz), where τ is the delay time by the optical fiber, was observed on the beat spectrum like the result in the laser diode experiment with subcoherence delay time.1 We have obtained the 80-kHz linewidth by comparing the homodyne beat spectrum with theoretical calculations. A 80-MHz acoustooptic modulator was employed in one arm of the homodyne setup to shift the optical frequency for heterodyne measurement. A 900-kHz frequency jitter from the time varying heterodyne beat signal on the rf spectrum analyzer was obtained, which is about two times better than the Schulz’s result of 2MHz.2
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Silverman, M. P. « Quantum beats from separated atoms excited by correlated photons ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.tuv6.

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Entangled multiparticle quantum states cannot be expressed as a product of singleparticle states; they can give rise to correlations between separated particles unaccountable within the framework of classical physics and are of considerable interest to those concerned with the foundations of quantum mechanics. Two separated identical atoms having, for example, two excited levels with energy interval h12 are brought into an entangled linear superposition of excited states by absorption of two correlated photons. The quantum description of either atom alone shows incoherently populated excited states; the single-atom emission probability shows no quantum interference. However, the joint probability for fluorescent emission manifests, as a function of the time interval between radiative decay of both atoms, quantum beats1 at frequency 12. This quantum interference is insensitive to atomic motion and atomic density, and it can be engendered by photons whose spectral widths are smaller than the beat frequency.
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Gao, Jun, Hyung T. Kwak et Marwah AlSinan. « Accurate Carbonate Pore System Characterization by Nuclear Magnetic Resonance and Micro-CT Techniques ». Dans SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204659-ms.

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Abstract Carbonate reservoir rocks usually have complex pore systems of broad size distributions, which determine many aspects of oil exploitation, from petrophysical properties to oil/water displacements. An accurate and complete description of these pore systems remains a challenge. A single technique often gives one measurement of complicated microscopic pore space. The new techniques (i.e., micro-CT and NMR) are utilized together with conventional methods (e.g., MICP, BET) to capture a more accurate and complete picture of pore structures. MICP measures the pore throat while the NMR T2 mainly measures the pore body. Micro-CT provides a 3D image of a limited sample size. Recently, NMR DDIF (decay due to diffusion in the internal field) for direct pore body size is extended from high to low magnetic field, which overcomes many limitations in pore system characterization. This study obtains pore throat size distributions from in-situ centrifuge capillary pressure and pore body size distributions from low field DDIF measurement and verifies them with micro-CT and BET/T2 in different types of carbonate rocks. The pore throat size distribution of the conventional sample is obtained from in-situ centrifuge capillary pressure. The major features of both macro and micro pore throat size distributions are captured. Pore size distributions are directly obtained from glass beads and carbonate rocks without calibration. Combined analysis of the pore size distribution from two methods reveals the underlying causes of their different petrophysical properties. The pore throat size distribution from in-situ centrifuge capillary pressure and pore size distribution from NMR DDIF can be employed to obtain a better understanding of conventional carbonate pore systems.
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Burns, Stephen A., Ann E. Elsner, Mary A. Johnson, Matthew L. Sevems et Mark R. Kreitz. « Nonlinearities in flicker electroretinograms ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.tuf3.

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The electroretinogram (ERG) is the mass electrical response of the retina to light and is affected by a wide variety of diseases. Because there are many retinal cell types contributing to the electrical response, dissection of the locus of disease-induced abnormalities is qualitative at best. We are using high temporal frequencies to minimize the contributions of rods and non-neural retinal cells to the ERG response. We Fourier-analyze the ERG responses to light modulated by either a sinusoidal or complex temporal waveform and use the amplitude of the linearand nonlinear components of the response to measure early visual processing. For instance, analysis of the beat amplitude in a two-sine-wave technique reveals a mechanism, probably the photoreceptors, that is low-pass with a 3 dB point at 50 Hz and a high-frequency slope of 4.0 on a log-log plot. Analysis of second- and higher- order nonlinear responses reveals a similar high frequency slope but a complex dependence of response amplitude on frequency. The data are compatible with generation by an essential nonlinearity, possibly a nonlinear gain-control mechanism with a temporal delay. We will illustrate the clinical utility of our approach with data from patients with either glaucoma or central retinal vein occlusions.
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Rapports d'organisations sur le sujet "Single beta decay"

1

Cirigliano, Vincenzo. Searching for new physics with single and double beta decay. Office of Scientific and Technical Information (OSTI), août 2020. http://dx.doi.org/10.2172/1650586.

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Charles, Eric A. A Measurement of the CP Parameter sine two beta Using Fully Reconstructed B to ccbar Decays at the BABAR Experiment. Office of Scientific and Technical Information (OSTI), avril 2003. http://dx.doi.org/10.2172/813023.

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