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New short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 126
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2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 771, 303-308 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 771, 303-308 p.
Keyword [en]
New isotope, Proton separation energy, Short-lived α radioactivity, Subshell closure
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-209508DOI: 10.1016/j.physletb.2017.03.074ISI: 000406183300045Scopus ID: 2-s2.0-85020090441OAI: oai:DiVA.org:kth-209508DiVA: diva2:1113048
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QC 20170621

Available from: 2017-06-21 Created: 2017-06-21 Last updated: 2017-09-12Bibliographically approved

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