Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Structure and Dynamics of Nuclei VI

HK 27.3: Vortrag

Mittwoch, 1. April 2020, 14:45–15:00, J-HS H

Sub-nanosecon K-isomers in 178W — •M. Rudigier1,2, P.M. Walker1, R.L. Canavan1,3, Zs. Podolyak1, P.H. Regan1,3, and P.-A. Söderström3,4 for the NuBall N-SI-99 collaboration — 1Department of Physics, University of Surrey, Guildford, GU2 7XH, UK — 2ent of Physics, UniverInstitut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt, Germany — 3National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

New data on half lives of nuclear excited states in 178W are presented. Data were taken in a measurement using the NuBall array at the IPN Orsay. Previously unkown half lives in the sub-nanosecond range of excited states of 178W have been measured by employing the fast timing method using 20 LaBr3 detectors. In particular, the half lives of the 12+ state at 3235 keV and the 11 state at 3053 keV have been measured for the first time. Reduced transition rates and hindrance factors were calculated based on the new experimental data. The study shows evidence for anomalously high transition rates from these levels to the ground state band. An 1389 keV E1 transition depopulating the 11 state at 3053 keV is the first observation of such an anomalous E1 transition rate from a K-isomer in an even-even nucleus. The results are discussed in terms of t-band admixture to the ground state band.

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