High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation

J. M. Allmond, B. A. Brown, A. E. Stuchbery, A. Galindo-Uribarri, E. Padilla-Rodal, D. C. Radford, J. C. Batchelder, M. E. Howard, J. F. Liang, B. Manning, R. L. Varner, C. H. Yu

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Abstract

High-precision reduced electric-quadrupole transition probabilities B(E2;01+→21+) have been measured from single-step Coulomb excitation of semi-magic Ni58,60,62,64 (Z=28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about Ni62, midshell between N=28 and 40, with larger values towards Ni56 (Z=N=28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft Ni56 core.

Original languageEnglish
Article number034309
JournalPhysical Review C - Nuclear Physics
Volume90
Issue number3
DOIs
StatePublished - Sep 15 2014

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