Isospin quintets in the 1p and sd shells

G. R. Burleson, G. S. Blanpied, G. H. Daw, A. J. Viescas, C. L. Morris, H. A. Thiessen, S. J. Greene, W. J. Braithwaite, W. B. Cottingame, D. B. Holtkamp, I. B. Moore, and C. F. Moore
Phys. Rev. C 22, 1180 – Published 1 September 1980
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Abstract

The pion double-charge exchange reaction (π+, π) has been used to measure the ground-state masses of O12, Ne16, Si24, and Ar32. The mass excesses were found to be 32.059(48), 24.051(45), 10.682(52), and - 2.181(50) MeV, respectively. These are the first reported measurements of the masses of Si24 and Ar32 and the values for O12 and Ne16 are improved over previous results. Good agreement with the isobaric multiplet mass equation M=a+bTz+cTz2 is obtained for the known members of all four quintets.

NUCLEAR REACTIONS Pion double-charge exchange, Be9(π+, π)C9, C12(π+, π)O12, C13(π+, π)O13, O16(π+, π)Ne16, Mg24(π+, π)Si24, S32(π+, π)Ar32, E=180 MeV, measured Q and dσdΩ (5°).

  • Received 19 February 1980

DOI:https://doi.org/10.1103/PhysRevC.22.1180

©1980 American Physical Society

Authors & Affiliations

G. R. Burleson, G. S. Blanpied, G. H. Daw, and A. J. Viescas*

  • New Mexico State University, Las Cruces, New Mexico 88003

C. L. Morris and H. A. Thiessen

  • Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545

S. J. Greene, W. J. Braithwaite, W. B. Cottingame, D. B. Holtkamp, I. B. Moore, and C. F. Moore

  • University of Texas, Austin, Texas 78712

  • *Present address: Stanford University, Stanford, California 94025.

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Vol. 22, Iss. 3 — September 1980

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