کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5494932 | 1528785 | 2017 | 6 صفحه PDF | دانلود رایگان |
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 9/2â 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.
Journal: Physics Letters B - Volume 771, 10 August 2017, Pages 303-308