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Article: Metastable States of 92,94Se: Identification of an Oblate K Isomer of 94Se and the Ground-State Shape Transition between N =58 and 60

TitleMetastable States of 92,94Se: Identification of an Oblate K Isomer of 94Se and the Ground-State Shape Transition between N =58 and 60
Authors
Issue Date2020
PublisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/
Citation
Physical Review Letters, 2020, v. 124 n. 22, article no. 222501 How to Cite?
AbstractHere we present new information on the shape evolution of the very neutron-rich Se-92,Se-94 nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed gamma rays emitted following the decay of their isomers. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasineutron states with an oblate deformation of beta similar to 0.25, with the high-K state in Se-94 being metastable and K hindered. Following this, Se-94 is the lowest-mass neutron-rich nucleus known to date with such a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. This opens up the possibility for a new region of K isomers at low Z and at oblate deformation, involving the same neutron orbitals as the prolate orbitals within the classic Z similar to 72 deformed hafnium region. From an interpretation of the level scheme guided by theoretical calculations, an oblate deformation is also suggested for the Se-94(60) ground-state band.
Persistent Identifierhttp://hdl.handle.net/10722/286293
ISSN
2019 Impact Factor: 8.385
2015 SCImago Journal Rankings: 3.731
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLizarazo, C-
dc.contributor.authorSöderström, PA-
dc.contributor.authorWerner, V-
dc.contributor.authorPietralla, N-
dc.contributor.authorWalker, PM-
dc.contributor.authorDong, GX-
dc.contributor.authorXu, FR-
dc.contributor.authorRodríguez, TR-
dc.contributor.authorBrowne, F-
dc.contributor.authorDoornenbal, P-
dc.contributor.authorNishimura, S-
dc.contributor.authorNiţă, CR-
dc.contributor.authorObertelli, A-
dc.contributor.authorAndo, T-
dc.contributor.authorArici, T-
dc.contributor.authorAuthelet, G-
dc.contributor.authorBaba, H-
dc.contributor.authorBlazhev, A-
dc.contributor.authorBruce, AM-
dc.contributor.authorCalvet, D-
dc.contributor.authorCaroll, RJ-
dc.contributor.authorChâteau, F-
dc.contributor.authorChen, S-
dc.contributor.authorChung, LX-
dc.contributor.authorCorsi, A-
dc.contributor.authorCortés, ML-
dc.contributor.authorDelbart, A-
dc.contributor.authorDewald, M-
dc.contributor.authorDing, B-
dc.contributor.authorFlavigny, F-
dc.contributor.authorFranchoo, S-
dc.contributor.authorGerl, J-
dc.contributor.authorGheller, JM-
dc.contributor.authorGiganon, A-
dc.contributor.authorGillibert, A-
dc.contributor.authorGórska, M-
dc.contributor.authorGottardo, A-
dc.contributor.authorKojouharov, I-
dc.contributor.authorKurz, N-
dc.contributor.authorLapoux, V-
dc.contributor.authorLee, J-
dc.contributor.authorLettmann, M-
dc.contributor.authorLinh, BD-
dc.contributor.authorLiu, JJ-
dc.contributor.authorLiu, Z-
dc.contributor.authorMomiyama, S-
dc.contributor.authorMoschner, K-
dc.contributor.authorMotobayashi, T-
dc.contributor.authorNagamine, S-
dc.contributor.authorNakatsuka, N-
dc.contributor.authorNiikura, M-
dc.contributor.authorNobs, C-
dc.contributor.authorOlivier, L-
dc.contributor.authorPatel, Z-
dc.contributor.authorPaul, N-
dc.contributor.authorPodolyák, Z-
dc.contributor.authorRoussé, JY-
dc.contributor.authorRudigier, M-
dc.contributor.authorSaito, TY-
dc.contributor.authorSakurai, H-
dc.contributor.authorSantamaria, C-
dc.contributor.authorSchaffner, H-
dc.contributor.authorShand, C-
dc.contributor.authorStefan, I-
dc.contributor.authorSteppenbeck, D-
dc.contributor.authorTaniuchi, R-
dc.contributor.authorUesaka, T-
dc.contributor.authorVaquero, V-
dc.contributor.authorWimmer, K-
dc.contributor.authorXu, Z-
dc.date.accessioned2020-08-31T07:01:52Z-
dc.date.available2020-08-31T07:01:52Z-
dc.date.issued2020-
dc.identifier.citationPhysical Review Letters, 2020, v. 124 n. 22, article no. 222501-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/286293-
dc.description.abstractHere we present new information on the shape evolution of the very neutron-rich Se-92,Se-94 nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed gamma rays emitted following the decay of their isomers. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasineutron states with an oblate deformation of beta similar to 0.25, with the high-K state in Se-94 being metastable and K hindered. Following this, Se-94 is the lowest-mass neutron-rich nucleus known to date with such a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. This opens up the possibility for a new region of K isomers at low Z and at oblate deformation, involving the same neutron orbitals as the prolate orbitals within the classic Z similar to 72 deformed hafnium region. From an interpretation of the level scheme guided by theoretical calculations, an oblate deformation is also suggested for the Se-94(60) ground-state band.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/-
dc.relation.ispartofPhysical Review Letters-
dc.rightsCopyright 2020 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevLett.124.222501.-
dc.titleMetastable States of 92,94Se: Identification of an Oblate K Isomer of 94Se and the Ground-State Shape Transition between N =58 and 60-
dc.typeArticle-
dc.identifier.emailLee, J: jleehc@hku.hk-
dc.identifier.emailLiu, JJ: jiajian@hku.hk-
dc.identifier.authorityLee, J=rp01902-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevLett.124.222501-
dc.identifier.pmid32567911-
dc.identifier.scopuseid_2-s2.0-85086878870-
dc.identifier.hkuros313332-
dc.identifier.volume124-
dc.identifier.issue22-
dc.identifier.spagearticle no. 222501-
dc.identifier.epagearticle no. 222501-
dc.identifier.isiWOS:000537197200003-
dc.publisher.placeUnited States-

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