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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Structure and Dynamics of Nuclei III
HK 14.5: Talk
Tuesday, March 12, 2024, 16:45–17:00, HBR 14: HS 1
The isovector spin-M1 response of 90Zr and 92Mo — •A. Gupta1, V. Werner1, K. E. Ide1, A. D. Ayangeakaa2, 3, M. Beuschlein1, S. W. Finch3,4, U. Friman-Gayer3,4,5, D. Gribble2, 3, J. Hauf1, J. Isaak1, X. James2, 3, R. V. F. Janssens2, 3, S. R. Johnson2, 3, J. Kleemann1, P. Koseoglou1, T. Kowalewski2, 3, B. Löher6, O. Papst1, N. Pietralla1, A. Saracino2, 3, D. Savran6, and N. SenSharma2,3 — 1IKP, TU Darmstadt — 2UNC, Chapel Hill, NC, USA — 3TUNL, Durham, NC, USA — 4Duke University, Durham, NC, USA — 5ESS, Lund, SE — 6GSI, Darmstadt
Nuclei near N=50, above Z=28 [1], play a significant role in core-collapse supernovae scenarios through their electron capture rates, which depend on the corresponding Gamow-Teller (GT) transitions. GT transitions are the weak analogue of isovector spin-flip M1 (IVSM1) transitions. The nuclide 92Mo features two extra protons in the proton g9/2 orbital beyond the closed pf shell which may cause additional IVSM1 strength as compared to 90Zr. The dipole response in both isotones in a nuclear resonance fluorescence experiment using the hybrid array of HPGe Clover and LaBr3 detectors at the HIγS facility have been studied and will be presented. Measuring asymmetries of ground-state transitions in an integral approach will be used to obtain the overall M1/E1 ground-state transition strength up to 10 MeV. Supported by DFG Project No.279384907-SFB 1245 and the U.S. DOE Grant Nos. DE-FG02-97ER41041 and DE-FG02-97ER41033.
[1] K. Langanke et al., Rep. Prog. Phys. 84, 066301 (2021)
Keywords: Nuclear structure; Nuclear Photonics; Shell Structure; M1 Resonance