Elsevier

Nuclear Physics A

Volume 151, Issue 2, 10 August 1970, Pages 257-272
Nuclear Physics A

Static quadrupole moments of the first excited states of 58,60,62Ni

https://doi.org/10.1016/0375-9474(70)90278-2Get rights and content

Abstract

Measurements of the relative thick-target yields of γ-rays de-exciting the 2+ first excited states in 58, 60, 62Ni, following Coulomb excitation by carbon, oxygen and sulfur ions, have been used to determine the relative static quadrupole moments of these states as well as the relative reduced transition probabilities, B(E2; 01+ → 21). The measured yields were compared with calculations using a Coulomb excitation coupled channels computer code in order to extract the quadrupole moments and B(E2) values. The following results are obtained if the effects of higher excited states are ignored: Q(58Ni) − 0.94Q(60Ni) = − (0.122 ± 0.039)e · b, B(E2; 01+ → 21+)58Ni/B(E2; 01+ → 21+)60Ni = 0.783 ± 0.014, Q(62Ni − 1.11Q(60Ni) = − (0.075 ± 0.092)e . b, B(E2; 01+ → 21+)62Ni/B(E2; 01+ → 21+)60Ni = 0.964 ± 0.026.

A previous experiment provided measurements of the absolute static quadrupole moment and B(E2) for 60Ni and these are used to obtain absolute values for 58Ni and 62Ni.

The experimental results are compared with various shell-model calculations as well as macroscopic model predictions. Qualitative agreement between theory and experiment is obtained.

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This work was supported by the National Science Foundation.

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