Open AccessNew short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 126
Author(s) -
Mingze Sun,
Z. Liu,
T.H. Huang,
W.Q. Zhang,
Jianguo Wang,
Xiaoyu Liu,
B. Ding,
Z. G. Gan,
L. Ma,
H. B. Yang,
ZY Zhang,
Lixia Yu,
Jian Jiang,
K. L. Wang,
Yonghong Wang,
Mingliang Liu,
Z. H. Li,
J. Li,
Xinqiang Wang,
Haiyan Lu,
C. J. Lin,
L. J. Sun,
N.R. Ma,
Cenxi Yuan,
Wei Zuo,
X. Xu,
XinHui Zhou,
Guoqing Xiao,
Chong Qi,
F. S. Zhang
Publication year - 2017
Publication title -
physics letters b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.093
H-Index - 283
eISSN - 1873-2445
pISSN - 0370-2693
DOI - 10.1016/j.physletb.2017.03.074
Subject(s) - physics , isotope , recoil , atomic physics , decay chain , nuclear fusion , separator (oil production) , ground state , nuclear physics , parity (physics) , thermodynamics
The N=130 short-lived isotope 223Np was produced as evaporation residue (ER) in the fusion reaction 40Ar + 187Re at the gas-filled recoil separator Spectrometer for Heavy Atom and Nuclear Structure (SHANS). It was identified through temporal and spatial correlations with α decays of 215Ac and/or 211Fr, the third and fourth members of the α-decay chain starting from 223Np. The pileup signals of ER(223Np)–α(223Np)–α(219Pa) were resolved by using the digital pulse processing technique. An α decay with half-life of T1/2=2.15(52100) μs and energy of Eα=9477(44) keV was attributed to 223Np. Spin and parity of 9/2− were tentatively proposed for the ground state of 223Np by combining the reduced α-decay width and large-scale shell-model calculations. This assignment together with the proton separation energy disprove the existence of a Z=92 subshell closure
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