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Title: Nonquenched Isoscalar Spin-M1 Excitations in sd-Shell Nuclei
Author(s): Matsubara, H.
Tamii, A.
Nakada, N.
Adachi, T.
Carter, J.
Dozono, M.
Fujita, H.
Fujita, K.
Fujita, Y.
Hatanaka, K.
Horiuchi, W.
Itoh, M.
Kawabata, T.
Kuroita, S.
Maeda, Y.
Navratil, P.
von Neumann-Cosel, P.
Neveling, R.
Okamura, H.
Popescu, Lucia
Poltoratska, I.
Richter, A.
Rubio, B.
Sakaguchi, H.
Sakemi, Y.
Sasamoto, Y.
Shimbara, Y
Shimizu, Y.
Smit, F.D.
Suda, K.
Tameshige, Y.
Tokieda, H.
Yamada, Y.
Yosoi, M.
Zenihiro, J.
Keywords: Isospin symmetry
Isoscalar Spin-M1 Excitations
nuclear structure
proton inelastic scattering
Issue Date: 1-Sep-2015
Publication type: Journal article
Citation: Matsubara H., Tamii A., Nakada N., Adachi T., Carter J., Dozono M., e.a.- Nonquenched Isoscalar Spin-M1 Excitations in sd-Shell Nuclei.- In: Physical Review Letters, 115(2015), p. 1025011-1025016.- ISSN 0031-9007
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.
Persistent URL: http://hdl.handle.net/10038/8619  Help icon
DOI: doi: 10.1103/PhysRevLett.115.102501  Help icon

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