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Lifetimes of core-excited states in semi-magic Rh-95
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0002-1406-5695
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-1771-2656
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
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Number of Authors: 432020 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 56, no 11, article id 291Article in journal (Refereed) Published
Abstract [en]

Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus Rh-95. The fusion-evaporation reaction Ni-58(Ca-40, 3p) was used to populate high-spin states in Rh-95 at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6 mg/cm(2) metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations. state-of-the-art theory. Remarkably, the structural features up to moderate angular momentum of nuclei immediately below the N = Z = 50 shell closures can be described with high accuracy in a very simple way by shell-model calculations including only the g(9/2) and p(1/2) subshells. Of special interest is the neutron-proton pair coupling scheme which is expected to appear in the heaviest N=Z nuclei [1,2] and the seniority structure of the N = 50 isotones [3-7]. However, multiple core-excited states have been observed in the semi-magic nuclei of the Sn-100 region [8-10]. The theoretical study of those states is a challenging task, which requires a significantly larger model space for their interpretation. Transition probabilities between nuclear states provide important constraints for theoretical modelling of the structure of the nuclei of interest. Our previous lifetime study of the semimagic (N = 50) nucleus Ru-94 [ 11,12] provided information on the electromagnetic decay properties of neutron-core excited states. We now address lifetime measurements in its closest, more neutron deficient, isotone Rh-95 using the same DSAM technique. The experimental results have been interpreted within the framework of large-scale shell-model (LSSM) calculations.

Place, publisher, year, edition, pages
Springer Nature , 2020. Vol. 56, no 11, article id 291
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-287525DOI: 10.1140/epja/s10050-020-00297-4ISI: 000590264900001Scopus ID: 2-s2.0-85096174353OAI: oai:DiVA.org:kth-287525DiVA, id: diva2:1510889
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QC 20201217

Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2022-06-25Bibliographically approved

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Qi, ChongCederwall, BoDoncel, MariaJakobsson, UlrikaNyberg, AyseBäck, TorbjörnGhazi Moradi, FarnazLi, Haipeng

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