l-Forbidden M1 Transition in S32: A Test of Tensor Corrections to the Magnetic Dipole Operator

B. Reitz, F. Hofmann, P. von Neumann-Cosel, F. Neumeyer, C. Rangacharyulu, A. Richter, G. Schrieder, D. I. Sober, and B. A. Brown
Phys. Rev. Lett. 82, 291 – Published 11 January 1999
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Abstract

The extremely weak l-forbidden 1d3/22s1/2 magnetic dipole ( M1) transition from the ground state of 32S to a Jπ=1+ state at Ex=7.003MeV was investigated by 165° and 180° electron scattering. The extracted strength of 0.0040(5)μN2 represents the smallest B(M1) value ever measured in electron scattering. A combined analysis with the isospin-analogous Gamow-Teller (GT) decays of the Jπ=1+ ground states of 32Cl and 32P is performed. Empirical corrections of Brown and Wildenthal to the magnetic operators reasonably account for the data. Corrections derived from microscopic approaches are less successful pointing towards a fundamental, not yet understood problem in the description of the effective M1 and GT operators.

  • Received 15 July 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.291

©1999 American Physical Society

Authors & Affiliations

B. Reitz, F. Hofmann, P. von Neumann-Cosel, F. Neumeyer, C. Rangacharyulu*, A. Richter, and G. Schrieder

  • Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany

D. I. Sober

  • Department of Physics, Catholic University of America, Washington, DC 20064

B. A. Brown

  • Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

  • *Visitor from the Department of Physics, University of Saskatchewan, Saskatoon S7N0W0, Canada.

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Vol. 82, Iss. 2 — 11 January 1999

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