Nonquenched Isoscalar Spin- M1 Excitations in sd -Shell Nuclei

H. Matsubara, A. Tamii, H. 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. Navrátil, P. Von Neumann-Cosel, R. Neveling, H. Okamura, L. PopescuI. Poltoratska, A. Richter, B. Rubio, H. Sakaguchi, S. 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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39 Citations (Scopus)


Differential cross sections of isoscalar and isovector spin-M1 (0+→1+) transitions are measured using high-energy-resolution proton inelastic scattering at Ep=295MeV on Mg24, Si28, S32, and Ar36 at 0°-14°. 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=16MeV 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.

Original languageEnglish
Article number102501
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 01-09-2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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