Decay of the odd-odd N=Z nuclide 78Y

J. Uusitalo, D. Seweryniak, P. F. Mantica, J. Rikovska, D. S. Brenner, M. Huhta, J. Greene, J. J. Ressler, B. Tomlin, C. N. Davids, C. J. Lister, and W. B. Walters
Phys. Rev. C 57, 2259 – Published 1 May 1998
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Abstract

The odd-odd N=Z nuclide, 78Y has been produced in the 40Ca(40Ca,pn) reaction at 125 MeV. Recoiling fragments separated by their A/Q values were implanted onto the tape of a moving tape collector and transported to a shielded position between two plastic β detectors and two Ge γ-ray detectors where β-γ coincidences were recorded as a function of time. γ rays with energies of 279 (100%), 504 (90%), and 713 (40%) keV, previously identified as yrast transitions in daughter 78Sr, were observed and found to decay with a half-life of 5.8 (6) s. From the relative intensities of the γ-rays, a spin and parity of 5+ and T=0 are assigned to the parent state in 78Y undergoing β decay. A production cross section of 4±1μb has been determined for 78Y by comparison of the counting rates with those of other reaction products with known cross sections. An upper limit of 500 keV can be set for the energy of this level relative to a possible highly deformed T=1 0+ ground state. From this limit, it can be inferred that T=1 pn pairing is considerably quenched relative to such pairing in adjacent odd-odd N=Z 74Rb. Two-quasiparticle rotor model calculations have been used to account for the structure of 78Y and adjacent nuclides.

  • Received 7 November 1997

DOI:https://doi.org/10.1103/PhysRevC.57.2259

©1998 American Physical Society

Authors & Affiliations

J. Uusitalo1, D. Seweryniak1,2, P. F. Mantica3, J. Rikovska2,4, D. S. Brenner5, M. Huhta3, J. Greene1, J. J. Ressler2, B. Tomlin5, C. N. Davids1, C. J. Lister1, and W. B. Walters2

  • 1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
  • 2Department of Chemistry, University of Maryland, College Park, Maryland 20742
  • 3National Superconducting Cyclotron Laboratory and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
  • 4Physics Department, Oxford University, Oxford OX1 3PU, United Kingdom
  • 5Department of Chemistry, Clark University, Worcester, Massachusetts 01610

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Vol. 57, Iss. 5 — May 1998

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