Breaking of the SU(4) limit for the Gamow-Teller strength in N $\sim$ Z nuclei - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal A Year : 2007

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.

Dates and versions

in2p3-00200557 , version 1 (21-12-2007)

Identifiers

Cite

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, 2007, 34, pp.319-324. ⟨10.1140/epja/i2007-10502-7⟩. ⟨in2p3-00200557⟩
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