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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Structure and Dynamics of Nuclei XI

HK 53.1: Group Report

Wednesday, March 13, 2024, 17:30–18:00, HBR 19: C 5b

The lowest-lying mixed-symmetry 2+ state in the N=80 isotones — •T. Stetz1, H. Mayr1, N. Pietralla1, G. Rainovski2, V. Werner1, and R. Zidarova11Technische Universität Darmstadt, Germany — 2Sofia University St. Kliment Ohridski, Bulgaria

Quadrupole collectivity near closed shells manifests in the known 21+ proton-neutron symmetric one quadrupole-phonon excitation of the valence shell and its isovector proton-neutron mixed-symmetric 2ms,1+ counterpart. Their respective character is quantified by the F-spin quantum number. A direct influence of subshell structure on the properties of the 2ms,1+ state has first been observed in 138Ce by Rainovski et al. [1]. This lack of shell stabilization leads to a distribution of the M1 strength of the 2ms,1+ configuration to the 21+ state over several excited 2+ states of 138Ce. In contrast, the B(M1;2i+ → 21+) strength in other N=80 isotones below the g7/2 subshell closure is isolated in a single 2+ state [2,3]. A recent two neutron-transfer experiment to determine the B(M1;22+ → 21+) of 132Te supports these observations. Furthermore, a single pronounced one-quadrupole phonon 2ms,1+ state has been found in 140Nd and 142Sm through Coulomb-excitation experiments, showing a restoration of F-spin symmetry above 138Ce [4,5].

[1] G. Rainovski et al., Phys. Rev. Lett. 96 (2006) 122501

[2] T. Ahn et al., Phys. Lett. B 679 (2009) 1

[3] N. Pietralla et al., Phys. Rev. C 58 (1998) 796

[4] R. Kern et al., Phys. Rev. C 102 (2020) 041304(R)

[5] R. Kern et al., J. Phys.: Conf. Ser. 1555 (2020) 012027

*Supported by BMBF 05P18RDCIA and 05P21RDCI2

Keywords: mixed-symmetry states; shell stabilization

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