Discovery of New Isotopes ¹⁶⁰Os and ¹⁵⁶W: Revealing Enhanced Stability of the N=82 Shell Closure on the Neutron-Deficient Side

H. B. Yang,Z. G. Gan, Y. J. Li, M. L. Liu, S. Y. Xu,C. Liu, M. M. Zhang, Z. Y. Zhang, M. H. Huang,C. X. Yuan, S. Y. Wang, L. Ma,J. G. Wang, X. C. Han, A. Rohilla, S. Q. Zuo, X. Xiao, X. B. Zhang, L. Zhu, Z. F. Yue, Y. L. Tian, Y. S. Wang, C. L. Yang,Z. Zhao, X. Y. Huang, Z. C. Li, L. C. Sun, J. Y. Wang, H. R. Yang, Z. W. Lu, W. Q. Yang,X. H. Zhou, W. X. Huang, N. Wang,S. G. Zhou, Z. Z. Ren, H. S. Xu

PHYSICAL REVIEW LETTERS（2024）

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摘要

Using the fusion -evaporation reaction 106Cd(58Ni; 4n)160Os and the gas -filled recoil separator SHANS, two new isotopes 76160Os and 74156W have been identified. The alpha decay of 160Os, measured with an alpha-particle energy of 7080(26) keV and a half-life of 201-F58 -37 mu s, is assigned to originate from the ground state. The daughter nucleus 156W is a beta-F emitter with a half-life of 291-F86 -61 ms. The newly measured alpha-decay data allow us to derive alpha-decay reduced widths (52) for the N = 84 isotones up to osmium (Z = 76), which are found to decrease with increasing atomic number above Z = 68. The reduction of 52 is interpreted as evidence for the strengthening of the N = 82 shell closure toward the proton drip line, supported by the increase of the neutron -shell gaps predicted in theoretical models.

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Discovery of New Isotopes 160Os and 156W: Revealing Enhanced Stability of the N=82 Shell Closure on the Neutron-Deficient Side

Discovery of New Isotopes ¹⁶⁰Os and ¹⁵⁶W: Revealing Enhanced Stability of the N=82 Shell Closure on the Neutron-Deficient Side