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Occurrence of a chiral-like pair band and a six-nucleon noncollective oblate isomer in ¹²⁰I

Moon, B.; Moon, C.-B.; Dracoulis, G.D.; Bark, R.A.; Byrne, A.P.; Davidson, P.A.; Lane, G.J.; Kibédi, T.; Wilson, A.N.; Yuan, C.; Hong, B.

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We report for the first time two distinctive features in the odd–odd nucleus 120 I: a pair of doublet bands and a high-spin isomer built on the πh11/2νh11/2 configuration. For producing the excited states of 120 I, a fusion-evaporation reaction 118 Sn( 6 Li, 4n) at E =lab48 MeV was employed. The beam was provided by the 14UD tandem accelerator of the Heavy Ion Accelerator Facility at the Australian National University. The observed doublet structure built on the positive-parity states is the...[Show more]

dc.contributor.authorMoon, B.
dc.contributor.authorMoon, C.-B.
dc.contributor.authorDracoulis, G.D.
dc.contributor.authorBark, R.A.
dc.contributor.authorByrne, A.P.
dc.contributor.authorDavidson, P.A.
dc.contributor.authorLane, G.J.
dc.contributor.authorKibédi, T.
dc.contributor.authorWilson, A.N.
dc.contributor.authorYuan, C.
dc.contributor.authorHong, B.
dc.date.accessioned2018-07-10T01:59:06Z
dc.date.available2018-07-10T01:59:06Z
dc.identifier26094
dc.identifier.issn0370-2693
dc.identifier.urihttp://hdl.handle.net/1885/144964
dc.description.abstractWe report for the first time two distinctive features in the odd–odd nucleus 120 I: a pair of doublet bands and a high-spin isomer built on the πh11/2νh11/2 configuration. For producing the excited states of 120 I, a fusion-evaporation reaction 118 Sn( 6 Li, 4n) at E =lab48 MeV was employed. The beam was provided by the 14UD tandem accelerator of the Heavy Ion Accelerator Facility at the Australian National University. The observed doublet structure built on the positive-parity states is the first case and unique in isotopes with Z=53 . The emerging properties are indicative of the known chiral characteristics, leading to a doubling of states for the πh11/2νh11/2 configuration. In contrast, the high-spin isomer with a half-life of 49(2) ns at spin-parity Jπ=25+ can be explained in terms of a noncollective oblate structure with the full alignment of six valence nucleons outside the 114 Sn core: three protons (g7/2)1(d5/2)1(h11/2)1 and three neutrons (h11/2)3 . This is an outstanding case that reveals a pure single-particle structure consisting of equal numbers of valence protons and neutrons outside the semi-double shell closure of 114 Sn with Z=50 and N=64 .
dc.description.sponsorshipDr. C. Yuan acknowledges the National Natural Science Foundation of China (11775316)
dc.format.mimetypeapplication/pdf
dc.publisherElsevier
dc.rights© 2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.sourcePhysics letters B
dc.source.urihttp://repo.scoap3.org/record/26094/files/main.pdf
dc.subjectIodine
dc.subjectIsomer
dc.subjectChiral-like pair band
dc.subjectIn-beam γ -ray spectroscopy
dc.titleOccurrence of a chiral-like pair band and a six-nucleon noncollective oblate isomer in ¹²⁰I
dc.typeJournal article
local.identifier.citationvolume782
dc.date.issued2018-06-26
local.identifier.ariespublicationa383154xPUB10367
local.publisher.urlhttps://www.elsevier.com/
local.type.statusPublished Version
local.contributor.affiliationMoon, B., Department of Physics, Korea University, Seoul, 02841, Republic of Korea
local.contributor.affiliationMoon, C.-B., Faculty of Science, Hoseo University, Chung-Nam, 31499, Republic of Korea
local.contributor.affiliationDracoulis, G.D., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationBark, R.A., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationByrne, A.P., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationDavidson, P.A., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationLane, G.J., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationKibédi, T., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationWilson, A.N., Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT, 2601, Australia
local.contributor.affiliationYuan, C., Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519-082, China
local.contributor.affiliationHong, B., Department of Physics, Korea University, Seoul, 02841, Republic of Korea
local.bibliographicCitation.startpage602
local.bibliographicCitation.lastpage606
local.identifier.doi10.1016/j.physletb.2018.06.008
dc.date.updated2018-07-01T10:05:38Z
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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