Systematics of isospin character of transitions to the 21+ and 31 states in Zr90,92,94,96

D. J. Horen, R. L. Auble, J. Gomez del Campo, G. R. Satchler, R. L. Varner, J. R. Beene, Brian Lund, V. R. Brown, P. L. Anthony, and V. A. Madsen
Phys. Rev. C 47, 629 – Published 1 February 1993
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Abstract

Differential cross sections for exciting the 21+ and 31 states of Zr90,92,94,96 with 70-MeV Li6 ions have been measured. Calculations of the cross sections have been performed using a deformed optical model potential (DOMP) with OMP deduced from fits to the elastic data, as well as a folding model with an effective nucleon-nucleon interaction with a Yukawa form factor obtained from fits to the elastic data and transition densities obtained from open-shell random phase approximation (RPA) calculations. The DOMP fits to the data yield values of Mn/Mp which are in good agreement with those predicted using the RPA. For the 21+ states, we find Mn/Mp increases from less than N/Z to greater than N/Z in going from Zr90 to Zr96. However, for the 31 states Mn/Mp remains less than N/Z for all cases, a result which is in disagreement with previous works. The folding model, with the RPA transition densities, provides good agreement with the 21+ measurements, but underpredicts the cross sections for the 31 states. A reanalysis of the earlier data from excitation of these states by (α,α) reactions removes much of the apparent discrepancies between those measurements and other measurements, including the ones reported here. The localization of the Li6 interaction is also discussed.

  • Received 7 October 1992

DOI:https://doi.org/10.1103/PhysRevC.47.629

©1993 American Physical Society

Authors & Affiliations

D. J. Horen, R. L. Auble, J. Gomez del Campo, G. R. Satchler, R. L. Varner, and J. R. Beene

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Brian Lund

  • Department of Physics, Yale University, New Haven, Connecticut 06511

V. R. Brown and P. L. Anthony

  • Lawrence Livermore National Laboratory, University of California, Livermore, California 94550

V. A. Madsen

  • Physics Department, Oregon State University, Corvallis, Oregon 97331

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Vol. 47, Iss. 2 — February 1993

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