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APS » Journals » Phys. Rev. C » Volume 52 » Issue 5
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Phys. Rev. C 52, R2298–R2301 (1995)

Observation of strong isospin mixing in proton emission from the astrophysically interesting isobaric analog state in 23Mg

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R. J. Tighe, J. C. Batchelder*, D. M. Moltz, T. J. Ognibene, M. W. Rowe, and Joseph Cerny
Department of Chemistry and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

B. A. Brown
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

Received 17 January 1995; published in the issue dated November 1995

Utilizing the 24Mg(p, 2n) reaction and unique particle telescopes, beta-delayed proton emission from 23Al proceeding via its isobaric analog state in 23Mg has been observed. The relevant proton group was detected at 223±20 keV with a proton decay branching ratio of 3.5±1.9%. The proton width determined for this state is approximately an order of magnitude larger than that predicted by a full-basis 1s-0d shell model calculation which includes the expected isospin mixing. In addition, the resulting resonance strength (45±25 meV) has important astrophysical implications.

© 1995 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.52.R2298
DOI:
10.1103/PhysRevC.52.R2298
PACS:
23.40.Hc, 23.50.+z, 27.30.+t, 95.30.Cq

*Present address: Oak Ridge National Laboratory, Building 6008, MS 6374, Oak Ridge, TN 37831.

 
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