Nuclear-structure studies of Sr88 and Y89 by inelastic alpha-particle scattering

J. Alster*, D. C. Shreve, R. J. Peterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The inelastic scattering of 42-MeV alpha particles from Sr88 and Y8, was studied in order to test the validity of the weak-coupling core-excitation model for these nuclei and to obtain an angular distribution for the excitation of the g92 single-particle state at 0.906 MeV in Y89. Angular distributions were obtained for scattering to the ground state and the 1.84-MeV (2+), 2.74-MeV (3-), and 3.21-MeV (2+) states in Sr88; and to the ground state and the 0.906-MeV (92+), 1.51-MeV (32-), 1.75-MeV (52-), 2.22-MeV (52+), 2.53-MeV (72+), 2.84-MeV, and 3.1-MeV states in Y89. The phase rule was used to obtain parities for additional levels in Y89 at 3.70, 3.98, and 4.17 MeV. A parametrized phase-shift analysis was used to fit the elastic-scattering data, and the Austern-Blair model with the same parameters was used to extract values of βIR from the inelastic angular distributions. It is shown that the weak-coupling model is not a good description for the excited states of Y89. A shell-model calculation correlating the differential cross sections to the 2+ states in Sr88 and the 1.51- and 1.75-MeV states in Y89 is made, and the results are found to be in slightly better agreement with experiment. The differential cross section to the 0.906-MeV (g92) single-particle state is in agreement with the Austern-Blair model for an I=5 transition.

Original languageEnglish
Pages (from-to)999-1012
Number of pages14
JournalPhysical Review
Volume144
Issue number3
DOIs
StatePublished - 1966
Externally publishedYes

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