Decays of new nuclides and isomers beyond the proton drip line - The influence of neutron configurations

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dc.contributor.authorPage R.D.
dc.contributor.authorBianco L.
dc.contributor.authorDarby I.G.
dc.contributor.authorJoss D.T.
dc.contributor.authorSimpson J.
dc.contributor.authorAl-Khalili J.S.
dc.contributor.authorHadinia B.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2008
dc.departmentNiğde ÖHÜ
dc.descriptionBozok University;Erciyes University;et al.;Istanbul University;Nigde University;The Turkish Atomic Energy Authority (TAEK)
dc.descriptionInternational Conference on Nuclear Physics and Astrophysics: From Stable Beams to Exotic Nuclei 2008 -- 25 June 2008 through 30 June 2008 -- -- 139817
dc.description.abstractThe energy of the vh 9/2 orbital in nuclei above N = 82 drops rapidly in energy relative to the vf 7/2 orbital as the occupancy of the ?h 11/2 orbital increases. These two neutron orbitals become nearly degenerate as the proton drip line is approached. In this work, we have discovered the new nuclides 161 Os and 157 W, and studied the decays of the proton emitter 160 Re in detail. The 161 Os and 160 Re nuclei were produced in reactions of 290, 300 and 310 MeV 58 Ni ions with an isotopically enriched 106 Cd target, separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The 161 Os a decays populated the new nuclide 157 W, which decayed by ß-particle emission. The ß decay fed the known ?-decaying l/2 + and 11/2 - states in 157 Ta, which is consistent with a vf 7/2 ground state in 157 W. The measured a-decay energy and half-life for 161 Os correspond to a reduced ?-decay width that is compatible with s-wave ?-particle emission, implying that its ground state is also a vf 7/2 state. Over 7000 160 Re nuclei were produced and the y decays of a new isomeric state feeding the ?d 3/2 level in 160 Re were discovered, but no evidence for the proton or a decay of the expected ?h 11/2 state could be found. The isomer decays offer a natural explanation for this non-observation and provides a striking example of the influence of the near degeneracy of the vh 9/2 and vf 7/2 orbitals on the properties of nuclei in this region. © 2008 American Institute of Physics.
dc.description.sponsorshipAcademy of Finland Science and Technology Facilities Council Finnish Centre of Excellence in Atomic Layer Deposition Natural Sciences and Engineering Research Council of Canada
dc.description.sponsorshipWe would like to thank the technical staff at Jyvaskyla for their excellent support and to Paul Morrall from Daresbury Laboratory for making the targets. This work has been supported by the UK Science and Technology Facilities Council; the Swedish Natural Science Research Council; the Academy of Finland under the Finnish Centre of Excellence Programme (project 44875 Nuclear and Condensed Matter Physics Programme at JYFL); the European Union Sixth Framework contract EURONS (RII3-CT-2004-506065) and the European Union Marie Curie Programme (contract HPMT-CT-2001-00250).
dc.identifier.doi10.1063/1.3039824
dc.identifier.endpage178
dc.identifier.isbn9.78074E+12
dc.identifier.issn0094243X
dc.identifier.scopus2-s2.0-80155168569
dc.identifier.scopusqualityN/A
dc.identifier.startpage172
dc.identifier.urihttps://dx.doi.org/10.1063/1.3039824
dc.identifier.urihttps://hdl.handle.net/11480/1122
dc.identifier.volume1072
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherAmerican Institute of Physics Inc.
dc.relation.ispartofAIP Conference Proceedings
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectEnriched targets
dc.subjectGas-filled recoil separator
dc.subjectNuclear Reactions 58 Ni+ 106 Cd at 290,300,310 MeV beam energy
dc.subjectSegmented Si and Ge detectors. Measured E ? ,E proton ,E ? ,T 1/2
dc.titleDecays of new nuclides and isomers beyond the proton drip line - The influence of neutron configurations
dc.typeConference Object

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