Based on the newest experimentally extracted nuclear density distributions for double-magic nucleus208Pb(Tarbert et al. in Phys Rev Lett 112:242502, 2014),the sensitivity of α-decay half-life to nuclear skin thicknes...Based on the newest experimentally extracted nuclear density distributions for double-magic nucleus208Pb(Tarbert et al. in Phys Rev Lett 112:242502, 2014),the sensitivity of α-decay half-life to nuclear skin thickness is explored in the vicinity of the shell closure region around208 Pb, i.e., isotopes of Z ? 82 and isotones of N ? 126.With the two-parameter Fermi(2PF) density distributions and an analytically derived formula, the α-decay half-life is found to be closely related to the magnitude of nuclear skin thickness. For a decays to the Z ? 82 isotopes, the α-decay half-life is found to decrease with the increasing neutron skin thickness, while the opposite behavior is found for a decays to the N ? 126 isotones. Therefore, it could be a possible way to extract the nuclear skin thickness from measured α-decay half-lives.展开更多
A new version of the generalized density-dependent cluster model （GDDCM） is developed to describe an α particle tunneling through a deformed potential barrier. The microscopic deformed potential is numerically cons...A new version of the generalized density-dependent cluster model （GDDCM） is developed to describe an α particle tunneling through a deformed potential barrier. The microscopic deformed potential is numerically constructed in the double-folding model using the multipole ex- pansion method. The decay width of an α-cluster state is evaluated using the integral of the quasi-bound state wave function, the scattering state wave function, and the difference of poten- tials. We perform a systematic calculation of α-decay half-lives for favored transitions in even-even nuclei ranging from Z=52 to Z=104. The calculated half-lives are in good agreement with the experimental values. The relation between nuclear deformations and α-decay half-lives is also discussed in details.展开更多
The neutron shell gap at N=152 has been experimentally confirmed through high-precision mass measurements on nobelium(Z=102)and lawrencium(Z=103)isotopes.The experimental measurements onα-decay properties suggest tha...The neutron shell gap at N=152 has been experimentally confirmed through high-precision mass measurements on nobelium(Z=102)and lawrencium(Z=103)isotopes.The experimental measurements onα-decay properties suggest that deformed doubly-magic nature of ^(270)Hs.However,the magic gaps in the superheavy region are generally expected to be fragile.In this study,we test the robustness of N=152 shell closure in N=152 isotones and Z=108 shell closure in Hs isotopes by employing an alternative approach where both theoretical analysis and available experimental data are required.Combined with existing experimental measurements on a-decay energies,it is determined that robust N=152 neutron shell persists at least in Z=101-105 isotopes,and robust Z=108 proton shell persists in Hs isotopes with N=159,160.Additionally,the relativistic mean-field model is determined as unable to provide N=152 shell.Thus,the conclusion that robust N=152 shell exists at least in Z=101-105 isotopes,provides crucial benchmarks for constraining effective interactions suitable for superheavy nuclei in nuclear energy-density functional theory in future.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11175085,11235001,11375086,and 11120101005)the 973 Program of China(No.2013CB834400)+1 种基金the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)the Open Project Program of the State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,China(No.Y5KF141CJ1)
文摘Based on the newest experimentally extracted nuclear density distributions for double-magic nucleus208Pb(Tarbert et al. in Phys Rev Lett 112:242502, 2014),the sensitivity of α-decay half-life to nuclear skin thickness is explored in the vicinity of the shell closure region around208 Pb, i.e., isotopes of Z ? 82 and isotones of N ? 126.With the two-parameter Fermi(2PF) density distributions and an analytically derived formula, the α-decay half-life is found to be closely related to the magnitude of nuclear skin thickness. For a decays to the Z ? 82 isotopes, the α-decay half-life is found to decrease with the increasing neutron skin thickness, while the opposite behavior is found for a decays to the N ? 126 isotones. Therefore, it could be a possible way to extract the nuclear skin thickness from measured α-decay half-lives.
基金supported by National Natural Science Foundation of China(Nos.10535010,10675090,10775068,10735010,10975072,11035001)973 National Major State Basic Research and Development of China(Nos.2007CB815004,2010CB327803)+1 种基金CAS Knowledge Innovation Project(No.KJCX2-SW-N02)Research Fund of Doctoral Point(RFDP) of China(Nos.20070284016,20100091110028)
文摘A new version of the generalized density-dependent cluster model （GDDCM） is developed to describe an α particle tunneling through a deformed potential barrier. The microscopic deformed potential is numerically constructed in the double-folding model using the multipole ex- pansion method. The decay width of an α-cluster state is evaluated using the integral of the quasi-bound state wave function, the scattering state wave function, and the difference of poten- tials. We perform a systematic calculation of α-decay half-lives for favored transitions in even-even nuclei ranging from Z=52 to Z=104. The calculated half-lives are in good agreement with the experimental values. The relation between nuclear deformations and α-decay half-lives is also discussed in details.
基金Supported by the National Natural Science Foundation of China(12222511)the National Key R&D Program of China(2023YFA1606701)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB34000000)。
文摘The neutron shell gap at N=152 has been experimentally confirmed through high-precision mass measurements on nobelium(Z=102)and lawrencium(Z=103)isotopes.The experimental measurements onα-decay properties suggest that deformed doubly-magic nature of ^(270)Hs.However,the magic gaps in the superheavy region are generally expected to be fragile.In this study,we test the robustness of N=152 shell closure in N=152 isotones and Z=108 shell closure in Hs isotopes by employing an alternative approach where both theoretical analysis and available experimental data are required.Combined with existing experimental measurements on a-decay energies,it is determined that robust N=152 neutron shell persists at least in Z=101-105 isotopes,and robust Z=108 proton shell persists in Hs isotopes with N=159,160.Additionally,the relativistic mean-field model is determined as unable to provide N=152 shell.Thus,the conclusion that robust N=152 shell exists at least in Z=101-105 isotopes,provides crucial benchmarks for constraining effective interactions suitable for superheavy nuclei in nuclear energy-density functional theory in future.
