Nonquenched Isoscalar Spin-M1 Excitations in sd-Shell Nuclei

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Authors

  • H. Matsubara
  • A. Tamii
  • N. Nakada
  • T. Adachi
  • J. Carter
  • M. Dozono
  • H. Fujita
  • K. Fujita
  • Y. Fujita
  • K. Hatanaka
  • W. Horiuchi
  • M. Itoh
  • T. Kawabata
  • S. Kuroita
  • Y. Maeda
  • P. Navratil
  • P. von Neumann-Cosel
  • R. Neveling
  • H. Okamura
  • I. Poltoratska
  • A. Richter
  • B. Rubio
  • H. Sakaguchi
  • Y. Sakemi
  • Y. Sasamoto
  • Y Shimbara
  • Y. Shimizu
  • F.D. Smit
  • K. Suda
  • Y. Tameshige
  • H. Tokieda
  • Y. Yamada
  • M. Yosoi
  • J. Zenihiro

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Abstract

Differential cross sections of isoscalar and isovector spin-M1 (0+ → 1+) transitions are measured using high-energy-resolution proton inelastic scattering at Ep = 295 MeV on 24Mg, 28Si, 32S, and 36Ar at scattering angles 0deg–14deg. The squared spin-M1 nuclear transition matrix elements are deduced from the measured differential cross sections by applying empirically determined unit cross sections based on the assumption of isospin symmetry. The ratios of the squared nuclear matrix elements accumulated up to Ex = 16 MeV compared to a shell-model prediction are 1.01(9) for isoscalar and 0.61(6) for isovector spin-M1 transitions, respectively. Thus, no quenching is observed for isoscalar spin-M1 transitions, while the matrix elements for isovector spin-M1 transitions are quenched by an amount comparable with the analogous Gamow-Teller transitions on those target nuclei.

Details

Original languageEnglish
Pages (from-to)1025011-1025016
JournalPhysical Review Letters
Volume115
DOIs
StatePublished - 1 Sep 2015

Keywords

  • Isospin symmetry, Isoscalar Spin-M1 Excitations, nuclear structure, proton inelastic scattering

ID: 165861