Measurement of isospin mixing in He4 and its implications for charge-symmetry breaking

C. L. Blilie, D. Dehnhard, D. B. Holtkamp, S. J. Seestrom-Morris, S. K. Nanda, W. B. Cottingame, D. Halderson, C. L. Morris, C. Fred Moore, P. A. Seidl, H. Ohnuma, K. Maeda

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18 Citations (Scopus)

Abstract

-He4 inelastic cross sections have been measured at T=180 MeV. In the region of the J=1- states Ex 23 to 30 MeV) the +- cross-section ratio R was found to be 1.05 ± 0.08 at lab=30°. Such a small deviation from 1.0 implies that isospin mixing between the T=0 and T=1 states in He4 is quite weak, in striking contrast to the strong isospin mixing deduced from the large ratio of photonucleon cross sections, R=(,p)(,n)1.7. Thus the conclusion drawn from the photonucleon work, that there is a large charge-symmetry-breaking nuclear force in He4, needs to be reexamined.

Original languageEnglish
Pages (from-to)543-546
Number of pages4
JournalPhysical review letters
Volume57
Issue number5
DOIs
Publication statusPublished - 1986

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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