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Breaking of the SU(4) limit for the Gamow-Teller strength in N $\sim$ Z nuclei

Abstract : We have performed large-scale shell model calculations of the Gamow-Teller strength distributions in N $\sim$ Z pf -shell nuclei. These calculations were motivated by the experimental attempts to measure the low-lying GT strength for the even-even N = Z + 2 or N = Z - 2 nuclei ^{46}Ti , ^{50}Cr , ^{54}Fe and ^{62}Ge , where a sizable low-energy GT strength could be interpreted as reminiscence of SU(4) symmetry; in the limit of exact SU(4) symmetry the GT- strength would be concentrated in a single transition to the lowest T = 0, J = 1^+ state in the daughter. We confirm that the SU(4) symmetry is strongly broken by the spin-orbit interaction and by increasing neutron excess.
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http://hal.in2p3.fr/in2p3-00200557
Contributor : Béatrice Forrler <>
Submitted on : Friday, December 21, 2007 - 10:28:38 AM
Last modification on : Friday, May 8, 2020 - 1:09:35 AM

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I. Petermann, G. Martınez-Pinedo, K. Langanke, E. Caurier. Breaking of the SU(4) limit for the Gamow-Teller strength in N $\sim$ Z nuclei. European Physical Journal A, EDP Sciences, 2007, 34, pp.319-324. ⟨10.1140/epja/i2007-10502-7⟩. ⟨in2p3-00200557⟩

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