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Phys. Rev. C 60, 031301 (1999) [4 pages]

The 0g.s.+→21+ transition in 38Ca and isospin symmetry in A=38 nuclei

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P. D. Cottle1, M. Fauerbach1, T. Glasmacher2,3, R. W. Ibbotson3, K. W. Kemper1, B. Pritychenko2,3, H. Scheit2,3 *, and M. Steiner2,3
1Department of Physics, Florida State University, Tallahassee, Florida 32306-4350
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
3National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824

Rapid Communication Received 6 May 1999; published 4 August 1999

The B(E2;0g.s.+→21+) value for 38Ca has been measured via the technique of intermediate energy Coulomb excitation using a beam of radioactive 38Ca nuclei. The present result is used to test isospin purity in the mass 38 system by comparing the isoscalar multipole matrix element M0 extracted from the 0g.s.+→21+ transitions in 38Ca and 38Ar to the corresponding matrix element obtained from the T=1 states of the Tz=0 nucleus 38K. A discrepancy between the two values of M0 is found, suggesting that isospin symmetry is broken in A=38 nuclei. Similar discrepancies occur for A=34 and 42. Experiments for addressing these discrepancies are proposed.


©1999 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.60.031301
DOI: 10.1103/PhysRevC.60.031301
PACS: 23.20.Js, 27.30.+t, 21.10.Hw

* Present address: Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany.

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