Nonquenched Isoscalar Spin-M1 Excitations in sd-Shell Nuclei

• Published in: Physical review letters Vol. 115; no. 10; p. 102501
• Main Authors: Matsubara, H, Tamii, A, Nakada, H, Adachi, T, Carter, J, Dozono, M, Fujita, H, Fujita, K, Fujita, Y, Hatanaka, K, Horiuchi, W, Itoh, M, Kawabata, T, Kuroita, S, Maeda, Y, Navrátil, P, von Neumann-Cosel, P, Neveling, R, Okamura, H, Popescu, L, Poltoratska, I, Richter, A, Rubio, B, Sakaguchi, H, Sakaguchi, S, Sakemi, Y, Sasamoto, Y, Shimbara, Y, Shimizu, Y, Smit, F D, Suda, K, Tameshige, Y, Tokieda, H, Yamada, Y, Yosoi, M, Zenihiro, J
• Format: Journal Article
• Language: English
• Published: United States 04-09-2015
• Subjects: Cross sections; Empirical analysis; Excitation; Inelastic scattering; Nuclei; Quenching; Quenching (cooling); Symmetry
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.115.102501

Differential cross sections of isoscalar and isovector spin-M1 (0(+)→1(+)) transitions are measured using high-energy-resolution proton inelastic scattering at E(p)=295  MeV on (24)Mg, (28)Si, (32)S, and (36)Ar 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 E(x)=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.