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Academic literature on the topic 'Low-Lying Excitation Energies'

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Published: 7 September 2023

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Journal articles on the topic "Low-Lying Excitation Energies"

1

Cheng, Y. Y., S. Q. Zhang, X. Q. Li, H. Hua, C. Xu, Z. H. Li, P. W. Zhao, et al. "Systematics on the low-lying spectra in N = 78 ~ 80 isotones." International Journal of Modern Physics E 23, no. 08 (August 2014): 1450037. http://dx.doi.org/10.1142/s0218301314500372.

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Combining the new spectroscopy results of 144 Tb and previous spectroscopy studies of neighboring nuclei, a systematic investigation on the low-lying spectra in N = 78 ~ 80 isotones is performed. Good systematics have been found for the coupling patterns which couple the odd nucleon(s), such as πh11/2, [Formula: see text], to the 2+, 4+, 6+ and 3- core excitations. It is found that the relative excitation energies of the states formed by coupling h11/2 proton(s) to the 2+, 4+ core excitations are pushed up, in contrast with those formed by coupling h11/2 neutron hole(s) to the 2+, 4+ core excitations, which are pulled down. According to the systematics, the interpretation that the 17/2+ states observed in 141 Sm and 143 Gd are the fully aligned member of coupling the odd h11/2 neutron hole to the octupole 3- core excitation, is explored to the isotones 145 Dy , 142 Eu , and 144 Tb .
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Ramı́rez, Rafael, and Telesforo López-Ciudad. "Low lying vibrational excitation energies from equilibrium path integral simulations." Journal of Chemical Physics 115, no. 1 (July 2001): 103–14. http://dx.doi.org/10.1063/1.1378318.

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SCHNACK, JÜRGEN, MARSHALL LUBAN, and ROBERT MODLER. "ROTATIONAL BAND STRUCTURE OF LOW-LYING EXCITATIONS IN SMALL HEISENBERG SYSTEMS." International Journal of Modern Physics B 17, no. 28 (November 10, 2003): 5053–57. http://dx.doi.org/10.1142/s0217979203020193.

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We derive the low-temperature properties of the giant molecular magnet { Mo 72 Fe 30}, where 30 Fe 3+ paramagnetic ions occupy the sites of an icosidodecahedron and interact via isotropic nearest-neighbour antiferromagnetic Heisenberg exchange. The key idea of our model is that the low-lying excitations form a sequence of "rotational bands", i.e. for each such band the excitation energies depend quadratically on the total spin quantum number. As rotational bands characterise the spectra of many magnetic molecules our method opens a new road towards a description of their low-temperature behaviour which is not accessible otherwise.
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TAKEUCHI, S., N. AOI, H. BABA, T. KUBO, T. MOTOBAYASHI, K. TANAKA, K. YAMADA, et al. "STUDY OF LOW-LYING STATES IN 32Mg." International Journal of Modern Physics E 18, no. 10 (November 2009): 2025–29. http://dx.doi.org/10.1142/s0218301309014226.

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Proton inelastic scattering on the neutron-rich nucleus 32 Mg has been experimentally studied at E lab = 46.5 MeV / nucleon in inverse kinematics. The energies of excited states in 32 Mg were obtained by measuring de-excitation γ rays. Several new states were identified by γ-γ coincidence analysis. Their spins and parities were restricted and the deformation parameters βp,p′ were extracted from the measured angular distribution of the proton inelastic scattering. The present analysis favors 4+ for the spin and parity of the 2321-keV state.
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Mardyban, M. A., D. A. Sazonov, E. A. Kolganova, and R. V. Jolos. "SHAPE EVOLUTION OF 96ZR AND 96MО WITH EXCITATION ENERGY INCREASE." Bulletin of Dubna International University for Nature, Society, and Man. Series: Natural and engineering sciences, no. 2 (43) (December 24, 2019): 37–41. http://dx.doi.org/10.37005/1818-0744-2019-2-37-41.

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The observed properties of the low-lying collective excitations of 96Zr and 96Mo are investigated in the framework of the collective quadrupole nuclear model with the Bohr Hamiltonian, whose potential energy has two minima – spherical and deformed. Satisfactory description of the excitation energies and E2 transition probabilities is obtained. It is shown that in the case of 96Zr both minima are sufficiently deep. However, in the case of 96Mo a deformed minimum is only outlined.
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Barreto, M. T., A. Canal Neto, and F. E. Jorge. "Gaussian basis sets for low-lying excited states of neutral atoms with 2 ≤ Z ≤ 36." Canadian Journal of Chemistry 82, no. 8 (August 1, 2004): 1237–43. http://dx.doi.org/10.1139/v04-084.

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The improved generator coordinate Hartree–Fock method is used to generate Gaussian basis sets for low-lying excited states of neutral atoms from He (Z = 2) to Kr (Z = 36). Then, excitation energies and orbital energies of the outermost orbitals of each symmetry are calculated and compared with the corresponding values obtained with numerical Hartree–Fock calculations. Besides this, the basis sets for Be (3P) and F (2P) are contracted by a standard procedure and, then, enriched with polarization functions. From these basis sets, total energies, dissociation energy, and bond length for BeF are calculated and compared with results obtained with other basis sets and with experimental values. The sets for He–Kr are useful in constructing basis sets for molecular calculations. Key words: improved generator coordinate Hartree–Fock method, Gaussian basis sets, low-lying excited states, neutral atoms.
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Dimitrova, Sevdalina, and Nicola Lo Iudice. "Large–scale shell model calculations for 140Xe." EPJ Web of Conferences 194 (2018): 01004. http://dx.doi.org/10.1051/epjconf/201819401004.

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This paper presents the results of a large-scale shell model calculations of the yrast spectrum of 140Xe. We extend the previous calculations confined to low-lying angular momenta to high-spin states apply- ing the same importance sampling iterative matrix diagonalization algorithm. Excitation energies and transi- tion probabilities are obtained by using an effective nucleon-nucleon interaction derived from the CD-Bonn nucleon-nucleon potential. A satisfactory agreement with the experimental data and the previous results for low lying states is achieved.
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Cave, Robert J., and Ernest R. Davidson. "Non-vertical excitation energies for low-lying singlet states of butadiene and hexatriene." Chemical Physics Letters 148, no. 2-3 (July 1988): 190–96. http://dx.doi.org/10.1016/0009-2614(88)80297-5.

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Ürer, Güldem, and Leyla Özdemir. "Energies and Electric Dipole Transitions for Low-Lying Levels of Protactinium IV and Uranium V." Zeitschrift für Naturforschung A 67, no. 1-2 (February 1, 2012): 89–98. http://dx.doi.org/10.5560/zna.2011-0066.

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We have reported a relativistic multiconfiguration Dirac-Fock (MCDF) study on low-lying level structures of protactinium IV (Z =91) and uranium V (Z =92) ions. Excitation energies and electric dipole (E1) transition parameters (wavelengths, oscillator strengths, and transition rates) for these low-lying levels have been given. We have also investigated the influence of the transverse Breit and quantum electrodynamic (QED) contributions besides correlation effects on the level structure. A comparison has been made with a few available data for these ions in the literature.
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PAAR, N., T. NIKŠIĆ, D. VRETENAR, and P. RING. "RELATIVISTIC DESCRIPTION OF EXOTIC COLLECTIVE EXCITATION PHENOMENA IN ATOMIC NUCLEI." International Journal of Modern Physics E 14, no. 01 (February 2005): 29–37. http://dx.doi.org/10.1142/s0218301305002746.

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The low-lying dipole and quadrupole states in neutron rich nuclei are studied within the fully self-consistent relativistic quasiparticle random-phase approximation (RQRPA), formulated in the canonical basis of the Relativistic Hartree–Bogoliubov model (RHB), which is extended to include the density dependent interactions. In heavier nuclei, the low-lying E1 excited state is identified as a pygmy dipole resonance (PDR), i.e. as a collective mode of excess neutrons oscillating against a proton–neutron core. Isotopic dependence of the PDR is characterized by a crossing between the PDR and one-neutron separation energies. Already at moderate proton–neutron asymmetry the PDR peak is calculated above the neutron emission threshold, indicating important implications for the observation of the PDR in (γ, γ′) scattering, and on the theoretical predictions of the radiative neutron capture rates in neutron-rich nuclei. In addition, a novel method is suggested for determining the neutron skin of nuclei, based on measurement of excitation energies of the Gamow–Teller resonance relative to the isobaric analog state.
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Book chapters on the topic "Low-Lying Excitation Energies"

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Soloviev, V. G., A. V. Sushkov, and N. Yu Shirikova. "Low-Lying Vibrational States in Deformed Nuclei." In Nuclear Shapes and Nuclear Structure at Low Excitation Energies, 195–99. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3342-9_15.

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Hagberg, E., V. T. Koslowsky, J. C. Hardy, and I. S. Towner. "Isospin Forbidden β Transitions to Low-Lying 0+ States and the Effect on Superallowed Decay Rates." In Nuclear Shapes and Nuclear Structure at Low Excitation Energies, 331–37. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3342-9_28.

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Tjia, M. O., and R. E. Siregar. "A Modified Pariser-Parr-Pople Formulation for the Study of Low Lying Excitation Energies of Polyenes." In Frontiers of Polymers and Advanced Materials, 297–303. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2447-2_27.

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