Decay of the I π = 8 − isomeric state in Nd 134 and Pt 184 studied by electron and γ spectroscopy

J. Perkowski (1) , J. Andrzejewski (1) , Ch. Droste (2) , Ł. Janiak (2) , E. Grodner (2) , S. G. Rohoziński (2) , L. Próchniak (3) , J. Srebrny (3) , J. Samorajczyk-Pyśk (3) , T. Abraham (3) , K. Hadyńska-Klȩk (3) , M. Kisieliński (3) , M. Komorowska (3) , M. Kowalczyk (3) , J. Kownacki (3) , T. Marchlewski (3) , J. Mierzejewski (3) , P. Napiorkowski (3) , A. Stolarz (3) , A. Korman (4) , M. Zielińska (5)

1 WFIS - Faculty of Physics and Applied Informatics [Lódź]
2 FUW - Faculty of Physics [Warsaw]
3 Heavy Ion Laboratory
4 National Centre for Nuclear Research [Otwock]
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

The properties of the K-isomer decays in the 134 Nd and 184 Pt nuclei have been investigated. Measurements were carried out in e-γ and γ-γ coincidence modes using electron spectrometers coupled to the central European Array for Gamma Levels Evaluations at the Heavy Ion Laboratory of the University of Warsaw. Internal conversion coefficients were obtained for transitions relevant to the decay of the isomeric states, allowing the determination of multipolarities and mixing ratios as well as hindrance factors. Two possible causes of the weakening of the K forbiddenness, namely rotational K mixing (Coriolis interaction) and triaxiality, are briefly discussed using schematic theoretical models.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J. Perkowski, J. Andrzejewski, Ch. Droste, Ł. Janiak, E. Grodner, et al.. Decay of the I π = 8 − isomeric state in Nd 134 and Pt 184 studied by electron and γ spectroscopy. Physical Review C, 2017, 95 (1), pp.014305. ⟨10.1103/PhysRevC.95.014305⟩. ⟨hal-01465731⟩