Synthesis and Reanalysis of Light Short-lived Actinides

• DOI: 10.7566/jpscp.32.010025
• Publication Date: 2020-07-16T04:02:36Z
• Authors: W.Q. Zhang; M.D. Sun; T.H. Huang; Z. Liu; J.G. Wang; B. Ding; X.Y. Liu; Z.G. Gan; L. Ma; H.B. Yang; Z.Y. Zhang; L. Yu; K.L. Wang; Y.S. Wang; M.L. Liu; H.Y. Lu; Z.H. Li; J. Li; X. Wang; C.J. Lin; L.J. Sun; N.R. Ma; W. Zuo; H.S. Xu; X.H. Zhou; G.Q. Xiao; C. Qi; F.S. Zhang

Short-lived \(\alpha \) emitters with N = 128–131 and Z 91–93 were studied in the fusion reaction ^40Ar + ^187Re using digital pulse processing technique at gas-filled recoil separator Spectrometer for Heavy Atom Nuclear Structure (SHANS). Two new isotopes ^223,224Np identified decay of 220 Pa was re-investigated through temporal spatial correlations. The pileup signals resolved by technique. An half-life \(T_{1/2} 2.15(_{52}^{100})\) μs energy \(E_{\alpha } 9477(44)\) keV attributed to ^223Np. \)-decay branches 38(_{11}^{26})\) μs, energies 9137(21) 8868(60) keV assigned ^224Np, decaying two excited states ^220Pa. results ^223Np disprove existence a 92 subshell closure.