München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 59: Structure and Dynamics of Nuclei XI
HK 59.2: Talk
Friday, March 22, 2019, 14:30–14:45, HS 14
Decay Characteristics of the Scissors Mode of the 0νββ-Decay Partner Isotopes 150Nd and 150Sm* — •J. Kleemann1, T. Beck1, U. Gayer1, N. Pietralla1, V. Werner1, S. Finch2, FNU Krishichayan2, B. Löher1, H. Pai1, 3, O. Papst1, W. Tornow2, and M. Weinert4 — 1IKP, TU Darmstadt — 2TUNL, Duke University, Durham NC, USA — 3SINP, Kolkata, India — 4IKP, Universität zu Köln
To investigate the decay characteristics of the scissors mode of the hypothesized neutrinoless double beta (0νββ) decay mother nucleus 150Nd and its daughter 150Sm, two nuclear resonance fluorescence experiments were conducted at the γ3-setup [1] at the High Intensity γ-ray Source (HIγS) of the Triangle Universities Nuclear Laboratory in Durham, NC, USA. By using HIγS’ intense, nearly monochromatic, linearly polarized γ-ray beam, dipole states were selectively excited and their parities determined through the azimuthal distribution of their ground-state decay intensities. Our new data on the scissors mode’s decay characteristics, especially its branching ratios to the 02+ states, allows constraining nuclear structure model calculations involved in an extraction of the neutrino mass from a 0νββ-decay rate. In particular, a determination of the Majorana parameters of the Interacting Boson Model-2 (IBM-2) is rendered possible [2]. Preliminary results and IBM-2 calculations will be presented and discussed.
*Supported by the DFG through the research grant SFB 1245.
[1] B. Löher et al. Nucl. Instr. Meth. Phys. Res. A 723, 136 (2013)
[2] J. Beller et al. Phys. Rev. Lett. 111, 172501 (2013)