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Effect of neutron alignments on the structure of Tl 197

Nandi, S.; Mukherjee, G; Roy, T; Banik, R.; Dhal, A; Bhattacharya, Soumik; Bhattacharya, S; Bhattacharya, C; Asgar, Md.A.; Pai, H.; Rajbanshi, S.; Banerjee, Kaushik

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The excited states of 197Tl have been studied via 19 Au(4He, 4n)197 Tl reaction at a beam energy of 50 MeV from the K-130 cyclotron at the Variable Energy Cyclotron Centre (VECC). The γ rays were detected using the VECC array for Nuclear Spectroscopy (VENUS) with six Compton-suppressed clover HPGe detectors. An improved level scheme of 197 Tl has been proposed from this work, which has been extended to 5.1 MeV of excitation energy and 39/2 ℏ of spin from the placement of 28 new γ-ray...[Show more]

dc.contributor.authorNandi, S.
dc.contributor.authorMukherjee, G
dc.contributor.authorRoy, T
dc.contributor.authorBanik, R.
dc.contributor.authorDhal, A
dc.contributor.authorBhattacharya, Soumik
dc.contributor.authorBhattacharya, S
dc.contributor.authorBhattacharya, C
dc.contributor.authorAsgar, Md.A.
dc.contributor.authorPai, H.
dc.contributor.authorRajbanshi, S.
dc.contributor.authorBanerjee, Kaushik
dc.date.accessioned2020-05-05T03:15:00Z
dc.date.available2020-05-05T03:15:00Z
dc.identifier.issn2469-9985
dc.identifier.urihttp://hdl.handle.net/1885/203786
dc.description.abstractThe excited states of 197Tl have been studied via 19 Au(4He, 4n)197 Tl reaction at a beam energy of 50 MeV from the K-130 cyclotron at the Variable Energy Cyclotron Centre (VECC). The γ rays were detected using the VECC array for Nuclear Spectroscopy (VENUS) with six Compton-suppressed clover HPGe detectors. An improved level scheme of 197 Tl has been proposed from this work, which has been extended to 5.1 MeV of excitation energy and 39/2 ℏ of spin from the placement of 28 new γ-ray transitions. Band crossings in the known one- and three-quasiparticle (qp) bands have been identified for the first time in this work. Two new bands, based on 3-qp and 5-qp configurations, have been observed for the first time in this nucleus; both of which are identified as the magnetic rotational (MR) in nature. The excitation energies of these bands are similar to that of the doubly degenerate bands observed for the similar 3-qp and 5-qp configurations in 195 Tl. These indicate a transition from an aplanar geometry of the neutron, proton, and the core angular momentum vectors to a planar one for neutron number N≥116 in Tl isotopes. The total Routhian surface calculations suggest a change in shape from oblate for the 1-qp configuration to a near-spherical one for the 3- and 5-qp configurations. This is consistent with the observed MR nature of the bands with multi-qp configuration. The MR bands are well reproduced by a model calculations in the frame work of the shears mechanism with the principal axis cranking.
dc.description.sponsorshipOne of the authors (H.P.) is grateful for the support from the Ramanujan Fellowship Research Grant under SERB-DST Grant No. SB/S2/RJN-031/2016.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherAmerican Physical Society
dc.rights©2019 American Physical Society
dc.sourcePhysical Review C: Nuclear Physics
dc.titleEffect of neutron alignments on the structure of Tl 197
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume99
dc.date.issued2019
local.identifier.absfor020202 - Nuclear Physics
local.identifier.ariespublicationu5786633xPUB922
local.publisher.urlhttps://www.aps.org/
local.type.statusPublished Version
local.contributor.affiliationNandi, S., Variable Energy Cyclotron Centre
local.contributor.affiliationMukherjee, G, Variable Energy Cyclotron Centre
local.contributor.affiliationRoy, T, Variable Energy Cyclotron Centre
local.contributor.affiliationBanik, R., Variable Energy Cyclotron Centre
local.contributor.affiliationDhal, A, Variable Energy Cyclotron Centre
local.contributor.affiliationBhattacharya, Soumik, Variable Energy Cyclotron Centre
local.contributor.affiliationBhattacharya, S, Variable Energy Cyclotron Centre
local.contributor.affiliationBhattacharya, C, Variable Energy Cyclotron Centre
local.contributor.affiliationAsgar, Md.A., Variable Energy Cyclotron Centre
local.contributor.affiliationPai, H., Saha Institute of Nuclear Physics
local.contributor.affiliationRajbanshi, S., Presidency University
local.contributor.affiliationBanerjee, Kaushik, College of Science, ANU
local.bibliographicCitation.issue5
local.bibliographicCitation.startpage054312-1
local.bibliographicCitation.lastpage054312-14
local.identifier.doi10.1103/PhysRevC.99.054312
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-11-25T08:04:02Z
local.identifier.scopusID2-s2.0-85065859076
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/2469-9985/..."author can archive publisher's version/PDF" from Sherpa/Romeo (as at 5/05/2020)
CollectionsANU Research Publications

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