Elsevier

Nuclear Physics A

Volume 277, Issue 1, 7 February 1977, Pages 77-108
Nuclear Physics A

E2 core-polarization charge for nuclei near 16O and 40Ca

https://doi.org/10.1016/0375-9474(77)90263-9Get rights and content

Abstract

Empirical electric-quadrupole core-polarization charges are extracted from the experimental γ-ray transitions probabilities and quadrupole moments of nuclei near 16O and 40Ca. using Woods-Saxon wave functions which include two-hole excitations of the cores. The results are discussed in terms of microscopic and macroscopic models of the core-polarization charge which are modified to include binding-energy-dependent effects. The empirical results 27A1 deduced levels, J. Enriched target. are en = 0.34±0.02 e and ep = 0.94±0.05 e for A = 18 and en = 0.57±0.03 e and ep = 1.06 ± 0.07 e for A = 42. In both the macroscopic and microscopic models the isoscalar polarization charges imply that some of the isoscalar E2 strength m 16O and 40Ca. lies above √2ħω. The isovector polarization charges are larger than predicted by the microscopic calculations using the Kuo-Brown interaction but are consistent with the macroscopic model where E(T = 1) = 3.3 h̵ω.

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    Present address: Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824.

    ††

    Research sponsored by the US Energy Research and Development Administration under contract with the Union Carbide Corporation.

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