Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Structure and Dynamics of Nuclei III

HK 14.5: Vortrag

Dienstag, 12. März 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. Ayangeakaa^{2, 3}, M. Beuschlein¹, S. W. Finch^3,4, U. Friman-Gayer^3,4,5, D. Gribble^{2, 3}, J. Hauf¹, J. Isaak¹, X. James^{2, 3}, R. V. F. Janssens^{2, 3}, S. R. Johnson^{2, 3}, J. Kleemann¹, P. Koseoglou¹, T. Kowalewski^{2, 3}, B. Löher⁶, O. Papst¹, N. Pietralla¹, A. Saracino^{2, 3}, D. Savran⁶, and N. SenSharma^2,3 — 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 g_9/2 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