Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Structure and Dynamics of Nuclei VIII
HK 39.6: Vortrag
Donnerstag, 19. März 2026, 17:30–17:45, AM 00.011
Evidence for M1 scissors mode states in 242Pu from nuclear resonance fluorescence — •M. Beuschlein1, J. Birkhan1, J. Kleemann1, O. Papst1, N. Pietralla1, R. Schwengner2, S. Weiß2, V. Werner1, U. Ahmed1, T. Beck1,3, I. Brandherm1, A. Gupta1, J. Hauf1, K. E. Ide1, P. Koseoglou1, H. Mayr1, C. M. Nickel1, K. Prifti1, D. Savran4, T. Stetz1, and R. Zidarova1 — 1IKP, Darmstadt, Germany — 2HZDR, Dresden, Germany — 3FRIB, East Lansing, MI, USA — 4GSI, Darmstadt, Germany
The availability of nuclear structure information on transuranium actinides supports stellar nucleosynthesis modeling and isotope-selective material inspection via photonuclear reactions. However, experimental data in this region remain scarce. The first nuclear resonance fluorescence (NRF) experiment on 242Pu was conducted at the S -DALINAC at TU Darmstadt to probe its low-energy dipole response. A 1 g sample of 242PuO2 was irradiated with bremsstrahlung up to an endpoint energy of 3.7 MeV. By comparing NRF spectra with the sample activity and natural background, photo-excited J=1 states of 242Pu were identified. From the assignment of the intrinsic projection quantum number K based on measured decay branching ratios, evidence was found for five fragments of the M1 scissors mode as well as for low-lying E1 excitations. Experimental details, γ-ray spectra, and measured transition strengths of newly observed 242Pu states will be presented.
This work is supported by the DFG through the research grant GRK 2891 “Nuclear Photonics,” Project-ID No. 499256822.
Keywords: scissors mode; transuranium actinides; nuclear resonance fluorescence; dipole response; collectivity