Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Structure and Dynamics of Nuclei I

HK 7.5: Talk

Monday, March 28, 2022, 15:00–15:15, HK-H6

Branching-ratio of the mixed-symmetry 2⁺-state of ¹³²Te* — •R. Mayer¹, T. Stetz¹, T. Beck¹, V. Werner¹, R. Zidarova¹, P. Koseoglou¹, N. Pietralla¹, R.-E. Mihai², R. Borcea², S. Calinescu², C. Costache², I. Dinescu², A. Ionescu², N. Marginean², C. Mihai², C.-R. Nita², S. Pascu², L. Stan², and S. Toma² — ¹IKP, TU Darmstadt — ²IFIN-HH, Bucharest

¹³²Te is two protons and two neutron holes away from the doubly-magic ¹³²Sn. Its second 2⁺ state has been found [1] to be a mixed-symmetry state which mostly decays by a strong M1 transition to the first 2⁺ state. The transition to the 0⁺ ground state occurs with a small branching ratio of 1.0(5)%. The large relative uncertainty of this ground-state decay branch prevented a precise determination of the 2₂⁺→ 2₁⁺ M1 strength from Coulomb-excitation data [1]. In a recent experiment, populating the 2₂⁺ state of ¹³²Te via the two-neutron transfer reaction ¹³⁰Te(¹⁸O,¹⁶O)¹³²Te in an experiment at IFIN-HH, we employed the ROSPHERE HPGe array for a Doppler-shift attenuation measurement aimed at the determination of the 2₂⁺ lifetime. While that analysis is ongoing, we sought to use the significant background reduction due to the use of the particle detection system SORCERER [2] to obtain a new value for the ground-state decay branch of the 2₂⁺ state.
[1] M. Danchev et al., Phys. Rev. C 84, 061306(R) (2011)
[2] T. Beck et al., Nucl. Inst. Meth. Phys. A 951 (2020) 163090
*Supported by the BMBF under the Grants No. 05P19RDFN1 and 05P21RDFN1.