Isovector <i>M</i>1 transitions in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Si</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>28</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and the role of meson exchange currents

C. Lüttge; P. von Neumann-Cosel; F. Neumeyer; C. Rangacharyulu; A. Richter; G. Schrieder; E. Spamer; D. I. Sober; S. K. Matthews; B. A. Brown

doi:10.1103/PhysRevC.53.127

Isovector M1 transitions in ${}^{28}{Si}$ and the role of meson exchange currents

C. Lüttge, P. von Neumann-Cosel, F. Neumeyer, C. Rangacharyulu, A. Richter, G. Schrieder, E. Spamer, D. I. Sober, S. K. Matthews, and B. A. Brown

Phys. Rev. C 53, 127 – Published 1 January 1996

Abstract

At the newly installed 180° Darmstadt electron scattering facility we have measured the isovector M1 transition strengths in ${}^{28}{Si}$ in the excitation energy range from 10 to 18 MeV. Overall agreement with a shell-model calculation using the unified sd-shell interaction and effective g factors is obtained. Comparison with Gamow-Teller strength deduced from (p,n) data reveals the presence of meson exchange current contributions of the order of 25% to the summed M1 transition strength. © 1996 The American Physical Society.