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Article: Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

TitleInterplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy
Authors
KeywordsIsomers
Neutrons
Rotational bands
Issue Date2019
PublisherElsevier: SCOAP3. The Journal's web site is located at http://www.elsevier.com/locate/physletb
Citation
Physics Letters B, 2019, v. 799, p. article no. 135036 How to Cite?
AbstractThe neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ=Kπ=(4−) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N=102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ=(1/2−) isomeric state at 166 keV to the Kπ=(5/2−) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N=103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state. © 2019 The Authors
Persistent Identifierhttp://hdl.handle.net/10722/280101
ISSN
2019 Impact Factor: 4.384
2015 SCImago Journal Rankings: 3.186

 

DC FieldValueLanguage
dc.contributor.authorZhang, GX-
dc.contributor.authorWatanabe, H-
dc.contributor.authorDracoulis, GD-
dc.contributor.authorKondev, FG-
dc.contributor.authorLane, GJ-
dc.contributor.authorRegan, PH-
dc.contributor.authorSöderström, P-A-
dc.contributor.authorWalker, PM-
dc.contributor.authorYoshida, K-
dc.contributor.authorKanaoka, H-
dc.contributor.authorKorkulu, Z-
dc.contributor.authorLee, PS-
dc.contributor.authorLiu, JJ-
dc.contributor.authorNishimura, S-
dc.contributor.authorWu, J-
dc.contributor.authorYagi, A-
dc.contributor.authorAhn, DS-
dc.contributor.authorAlharbi, T-
dc.contributor.authorBaba, H-
dc.contributor.authorBrowne, F-
dc.contributor.authorBruce, AM-
dc.contributor.authorCarpenter, MP-
dc.contributor.authorCarroll, RJ-
dc.contributor.authorChae, KY-
dc.contributor.authorChiara, CJ-
dc.contributor.authorDombradi, Z-
dc.contributor.authorDoornenbal, P-
dc.contributor.authorEstrade, A-
dc.contributor.authorFukuda, N-
dc.contributor.authorGriffin, C-
dc.contributor.authorIdeguchi, E-
dc.contributor.authorInabe, N-
dc.contributor.authorIsobe, T-
dc.contributor.authorKanaya, S-
dc.contributor.authorKojouharov, I-
dc.contributor.authorKubo, T-
dc.contributor.authorKubono, S-
dc.contributor.authorKurz, N-
dc.contributor.authorKuti, I-
dc.contributor.authorLalkovski, S-
dc.contributor.authorLauritsen, T-
dc.contributor.authorLee, CS-
dc.contributor.authorLee, EJ-
dc.contributor.authorLister, CJ-
dc.contributor.authorLorusso, G-
dc.contributor.authorLotay, G-
dc.contributor.authorMcCutchan, EA-
dc.contributor.authorMoon, C-B-
dc.contributor.authorNishizuka, I-
dc.contributor.authorNita, CR-
dc.contributor.authorOdahara, A-
dc.contributor.authorPatel, Z-
dc.contributor.authorPhong, VH-
dc.contributor.authorPodolyák, Z-
dc.contributor.authorRoberts, OJ-
dc.contributor.authorSakurai, H-
dc.contributor.authorSchaffner, H-
dc.contributor.authorSeweryniak, D-
dc.contributor.authorShand, CM-
dc.contributor.authorShimizu, Y-
dc.contributor.authorSumikama, T-
dc.contributor.authorSuzuki, H-
dc.contributor.authorTakeda, H-
dc.contributor.authorTerashima, S-
dc.contributor.authorVajta, Z-
dc.contributor.authorValiente-Dóbon, JJ-
dc.contributor.authorXu, ZY-
dc.contributor.authorZhu, S-
dc.date.accessioned2020-01-06T02:00:58Z-
dc.date.available2020-01-06T02:00:58Z-
dc.date.issued2019-
dc.identifier.citationPhysics Letters B, 2019, v. 799, p. article no. 135036-
dc.identifier.issn0370-2693-
dc.identifier.urihttp://hdl.handle.net/10722/280101-
dc.description.abstractThe neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ=Kπ=(4−) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N=102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ=(1/2−) isomeric state at 166 keV to the Kπ=(5/2−) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N=103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state. © 2019 The Authors-
dc.languageeng-
dc.publisherElsevier: SCOAP3. The Journal's web site is located at http://www.elsevier.com/locate/physletb-
dc.relation.ispartofPhysics Letters B-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectIsomers-
dc.subjectNeutrons-
dc.subjectRotational bands-
dc.titleInterplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy-
dc.typeArticle-
dc.identifier.emailLiu, JJ: jiajian@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1016/j.physletb.2019.135036-
dc.identifier.scopuseid_2-s2.0-85074501737-
dc.identifier.hkuros308864-
dc.identifier.volume799-
dc.identifier.spagearticle no. 135036-
dc.identifier.epagearticle no. 135036-
dc.publisher.placeNetherlands-

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