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gamma-ray spectroscopy approaching the limits of existence of atomic nuclei: A study of the excited states of Pt-168 and Pt-169
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2009 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 79, no 6Article in journal (Refereed) Published
Abstract [en]

Excited states in the N=90 and N=91 Pt nuclei have been investigated using the JUROGAM and GREAT spectrometers in conjunction with the RITU gas-filled separator. These nuclei were populated via the reactions Mo-92(Kr-78,2n) and Mo-94(Kr-78,3n) at 335 and 348 MeV, respectively. The recoil-decay tagging technique has been used to correlate prompt gamma radiation with the characteristic alpha decays of Pt-168 and Pt-169. A gamma-gamma analysis has allowed a level scheme for Pt-168 to be reported for the first time and the level scheme for Pt-169 to be extended. The excitation energies of the proposed positive-parity yrast states of Pt-168 are compared with calculations based on the interacting boson model and found to be in excellent agreement. These data show a continuation of the trend toward vibrational nuclei as the N=82 shell gap is approached. In addition, new excited states constituting two decay paths have been discovered in Pt-169.



Place, publisher, year, edition, pages
2009. Vol. 79, no 6
Keyword [en]
neutron-deficient isotopes, total data readout, platinum isotopes, shape coexistence, elements
URN: urn:nbn:se:kth:diva-18577DOI: 10.1103/PhysRevC.79.064314ISI: 000267701200025ScopusID: 2-s2.0-67549113814OAI: diva2:336624
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-02-09Bibliographically approved

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Cederwall, BoHadinia, BaharakSandzelius, Mikael
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