Year: 2017
Type: article
Abstract: 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.
Source: Physics Letters B
Authors: M.D. Sun, Z. Liu, T.H. Huang, W.Q. Zhang, J.G. Wang, X.Y. Liu, B. Ding, Z.G. Gan, L. Ma, H.B. Yang, Z.Y. Zhang, L. Yu, J. Jiang, K.L. Wang, Y.S. Wang, M.L. Liu, Z.H. Li, J. Li, X. Wang, H.Y. Lu, C.J. Lin, L.J. Sun, N.R. Ma, C.X. Yuan, W. Zuo, H.S. Xu, X.H. Zhou, G.Q. Xiao, C. Qi, F.S. Zhang
Institutions: Chinese Academy of Sciences, Institute of Modern Physics, University of Chinese Academy of Sciences, Lanzhou University, Peking University, State Key Laboratory of Nuclear Physics and Technology, China Institute of Atomic Energy, Sun Yat-sen University, AlbaNova, KTH Royal Institute of Technology, Beijing Normal University, Beijing Radiation Center
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2616601212