A fully microscopic model of total level density in spherical nuclei
A fully microscopic model for the description of nuclear level density (NLD) in spherical nuclei is proposed. The model is derived by combining the partition function of the exact pairing solution plus the independent-particle model at finite temperature (EP+IPM) with that obtained by using the coll...
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doaj-42cf3c5fa8d14d3095bc4fa1d4c71b5a2020-12-09T04:14:11ZengElsevierPhysics Letters B0370-26932020-12-01811135858A fully microscopic model of total level density in spherical nucleiN. Quang Hung0N. Dinh Dang1L. Tan Phuc2N. Ngoc Anh3T. Dong Xuan4T.V. Nhan Hao5Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam; Faculty of Natural Sciences, Duy Tan University, Da Nang City 550000, Vietnam; Corresponding author at: Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam.Quantum Hadron Physics Laboratory, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako City, 351-0198 Saitama, JapanInstitute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam; Faculty of Natural Sciences, Duy Tan University, Da Nang City 550000, VietnamDalat Nuclear Research Institute, Vietnam Atomic Energy Institute, 01 Nguyen Tu Luc, Dalat City 670000, VietnamInstitute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam; Faculty of Natural Sciences, Duy Tan University, Da Nang City 550000, VietnamFaculty of Physics, University of Education, Hue University, 34 Le Loi Street, Hue City 520000, VietnamA fully microscopic model for the description of nuclear level density (NLD) in spherical nuclei is proposed. The model is derived by combining the partition function of the exact pairing solution plus the independent-particle model at finite temperature (EP+IPM) with that obtained by using the collective vibrational states calculated from the self-consistent Hartree-Fock mean field with MSk3 interaction plus the exact pairing and random-phases approximation (SC-HFEPRPA). Two important factors are taken into account in a fully microscopic way, namely the spin cut-off and vibrational enhancement factors are, respectively, calculated using the statistical thermodynamics and partition function of the SC-HFEPRPA without any fitting parameters. The numerical test for two spherical 60Ni and 90Zr nuclei shows that the collective vibrational enhancement is mostly dominated by the quadrupole and octupole excitations. This is the first microscopic model confirming such an effect, which was phenomenologically predicted long time ago and widely employed in several NLD models. In addition, the influence of collective vibrational enhancement on nuclear thermodynamic quantities such as excitation energy, specific heat capacity and entropy is also studied by using the proposed model.http://www.sciencedirect.com/science/article/pii/S0370269320306614Nuclear level densityStatistical model calculationExact pairing solutionCollective vibrational excitations |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
N. Quang Hung N. Dinh Dang L. Tan Phuc N. Ngoc Anh T. Dong Xuan T.V. Nhan Hao |
spellingShingle |
N. Quang Hung N. Dinh Dang L. Tan Phuc N. Ngoc Anh T. Dong Xuan T.V. Nhan Hao A fully microscopic model of total level density in spherical nuclei Physics Letters B Nuclear level density Statistical model calculation Exact pairing solution Collective vibrational excitations |
author_facet |
N. Quang Hung N. Dinh Dang L. Tan Phuc N. Ngoc Anh T. Dong Xuan T.V. Nhan Hao |
author_sort |
N. Quang Hung |
title |
A fully microscopic model of total level density in spherical nuclei |
title_short |
A fully microscopic model of total level density in spherical nuclei |
title_full |
A fully microscopic model of total level density in spherical nuclei |
title_fullStr |
A fully microscopic model of total level density in spherical nuclei |
title_full_unstemmed |
A fully microscopic model of total level density in spherical nuclei |
title_sort |
fully microscopic model of total level density in spherical nuclei |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 |
publishDate |
2020-12-01 |
description |
A fully microscopic model for the description of nuclear level density (NLD) in spherical nuclei is proposed. The model is derived by combining the partition function of the exact pairing solution plus the independent-particle model at finite temperature (EP+IPM) with that obtained by using the collective vibrational states calculated from the self-consistent Hartree-Fock mean field with MSk3 interaction plus the exact pairing and random-phases approximation (SC-HFEPRPA). Two important factors are taken into account in a fully microscopic way, namely the spin cut-off and vibrational enhancement factors are, respectively, calculated using the statistical thermodynamics and partition function of the SC-HFEPRPA without any fitting parameters. The numerical test for two spherical 60Ni and 90Zr nuclei shows that the collective vibrational enhancement is mostly dominated by the quadrupole and octupole excitations. This is the first microscopic model confirming such an effect, which was phenomenologically predicted long time ago and widely employed in several NLD models. In addition, the influence of collective vibrational enhancement on nuclear thermodynamic quantities such as excitation energy, specific heat capacity and entropy is also studied by using the proposed model. |
topic |
Nuclear level density Statistical model calculation Exact pairing solution Collective vibrational excitations |
url |
http://www.sciencedirect.com/science/article/pii/S0370269320306614 |
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