New isotope Y80, and the decays of Sr79, Y81, and Y82

C. J. Lister, P. E. Haustein, D. E. Alburger, and J. W. Olness
Phys. Rev. C 24, 260 – Published 1 July 1981
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Abstract

The helium-jet recoil transfer technique has been used to study the decays of Sr79, Y80, Y81, and Y82, produced by Ni58(Mg24,2pn), Ni58(Mg24,pn), Ni58(Mg25,pn), and Ni60(Mg24,pn) reactions, respectively. Decay properties of these four radioactivities have been deduced from the analysis of extensive singles and multiparameter spectroscopic measurements. The low lying level structure of Sr80, as revealed by the decay of Y80, can be reproduced through calculations of the interacting-boson-approximation model which place Sr80 at or near the O(6) limit. Positron endpoint measurements [deduced from (β,γ) coincidence studies] have been used to determine decay energies for each of these nuclides. Nuclidic mass excesses inferred from these data show progressively larger deviations from the predictions of currently available mass models for the more neutron-deficient Y isotopes as the N=Z line is approached. It is suggested that this may reflect the influence of nuclear deformation of these isotopes on the mass surface in the vicinity of N=Z=40.

[RADIOACTIVITY Sr79 from Ni58(Mg24,2pn); Y80 from Ni58(Mg24,pn); Y81 from Ni58(Mg25,pn); Y82 from Ni60(Mg24,pn); measured T12, σ(E), Eγ, Ex, Eβ, Iγ, Ix, Iβ, (γ,γ,t), (X,γ,t), (β,γ,t) coincidences; deduced levels, Jπ, Qβ, mass excess, logft, He-jet system, enriched targets, Ge(Li), Ge and plastic detectors; comparison with mass predictions.]

  • Received 28 January 1981

DOI:https://doi.org/10.1103/PhysRevC.24.260

©1981 American Physical Society

Authors & Affiliations

C. J. Lister*, P. E. Haustein, D. E. Alburger, and J. W. Olness

  • Brookhaven National Laboratory, Upton, New York 11973

  • *Present address: Shuster Laboratory, Department of Physics, University of Manchester, Manchester, M13-9PL, England.

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Vol. 24, Iss. 1 — July 1981

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