Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Structure and Dynamics of Nuclei III
HK 17.1: Gruppenbericht
Montag, 28. März 2022, 16:00–16:30, HK-H6
Absolute electromagnetic transition rates in the semi-magic 211At nucleus and their implications for the nuclear structure above 208Pb. — •Jan Jolie1, Vasil Karayonchev1, Andrey Blazhev1, Arwin Esmaylzadeh1, Christoph Fransen1, Lukas Knafla1, Claus Mueller-Gatermann1, Jean-Marc Regis1, and Pieter Van Isacker2 — 1IKP, Universitaet zu Koeln, Zuelpicher Str. 77, D-50937 Koeln, Germany — 2GANIL, CEA/DRF-CNRS/IN2P3, Bvd Henri Becquerel, F-14076 Caen, France
Motivated by the abnormal yrast B(E2) values in 210Po[1], lifetimes of excited states in 211At were measured using the electronic gamma - gamma fast timing technique and the Recoil Doppler Shift Method (RDSM) at the Cologne FN Tandem accelerator. For the fast timing experiment the 208Pb(6Li,3n) fusion-evaporation reaction and the HORUS detector array equipped with eight HPGe detectors and nine LaBr3(Ce) scintillators were used[2]. For the RDSM experiment the 209Bi(16O,14C) two-proton transfer reaction was performed and 14C was detected with solar cells mounted in the Cologne plunger setup. Several lifetimes were determined for the first time. The results are compared to shell model calculation using two approaches: analytical calculations using a semiempirical interaction for three particles in a single j = 9/2 shell and untruncated numerical full shell model calculations with the modified Kuo-Herling interaction. Very good agreement is obtained, especially with the analytical single-j calculation. [1] D. Kocheva, et al., Eur. Phys. J. A 53 (2017) 175;[2] V. Karayonchev, et al., Phys. Rev. C 99 (2019) 024326.