SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 70: Structure and Dynamics of Nuclei XV

HK 70.3: Vortrag

Donnerstag, 23. März 2023, 16:30–16:45, SCH/A215

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}, and D. Savran⁶ — ¹IKP, TU Darmstadt — ²UNC, Chapel Hill, NC, USA — ³TUNL, Durham, NC, USA — ⁴Duke U., Durham, NC, USA — ⁵ESS, Lund, SE — ⁶GSI, Darmstadt

For the N=50 isotones ⁹⁰Zr and ⁹²Mo, additional isovector spin-flip M1 (IVSM1) strength is expected for ⁹²Mo in comparison to ⁹⁰Zr because of the two additional protons in the proton g_9/2 orbital above the closed pf shell. In addition, the IVSM1 resonance is closely related to Gamow-Teller strengths and can serve to constrain the calculation of electron-capture rates in core-collapse supernova scenarios[1]. Using the newly available hybrid array of HPGe Clover and LaBr₃ detectors at the High Intensity γ-ray source (HIγS), we probed the dipole response of both isotopes in an integral-spectroscopy approach below neutron separation thresholds.The E1 and M1 strengths will be determined up to about 9 MeV by measuring the asymmetries resulting from the excitation of the target nuclei by the fully-polarized γ-ray beam. The experimental method and first results will be discussed.

Supported by DFG Project No.279384907-SFB 1245 and the U.S. DOE Grant No. DE-FG02-97ER41041 and No. DE-FG02-97ER41033.

[1] K. Langanke et al., Rep. Prog. Phys. 84, 066301 (2021)