Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Structure and Dynamics of Nuclei III
HK 13.3: Vortrag
Dienstag, 17. März 2026, 17:15–17:30, AM 00.011
Lifetime measurement of excited states of 172W — •K. E. Ide1, V. Werner1, R. Abels2, U. Ahmed1, D. Bittner2, T. Biesenbach2, A. Blazhev2, A. Esmaylzadeh2, C. Fransen2, J. Jolie2, H. Kleis2, C. -D. Lakenbrink2, M. Ley2, H. Mayr1, M. Müllenmeister2, C. M. Nickel1, R. Novak2, A. Pfeil2, N. Pietralla1, J. Roob2, F. von Spee2, T. Stetz1, T. Sültenfuß2, and R. Zidarova1 — 1IKP, TU Darmstadt — 2IKP, Uni Köln
Nuclear quadrupole collectivity is identified from enhanced E2 decay rates. A sudden increase of the E2 strength of the 21+→01+ transition from N=96 (170W) to N=98 (172W) in the W isotopic chain is unexpected compared to the neighboring Hf isotopic chain. This discrepancy was investigated by lifetime measurements of 170W [1] which confirmed the low B(E2;21+→01+) value. In this work we investigate yrast B(E2) values of 172W to study the structural evolution of the yrast band in comparison to 170W. The experiment was performed at the Cologne 10 MV FN-tandem accelerator facility and used the Cologne plunger device [2] and the CATHEDRAL spectrometer. The fast-timing method and the RDDS method are used complementarily to determine the lifetimes of yrast states. First results will be presented and compared to the confined β-soft (CBS) rotor model [3].
[1] K. E. Ide et al., LNL report 2019 (2020).
[2] A. Dewald, O. Möller, and P. Petkov, PPNP 67 (2012) 786.
[3] N. Pietralla and O. M. Gorbachenko, PRC 70 (2004) 011304. Supported by DFG (GRK 2128, GRK 2891 ’Nuclear Photonics’, INST 216/988-1 FUGG) and by BMBF under Grant No. 05P21RDCI2.
Keywords: 172W; Cologne CATHEDRAL spectrometer; Cologne plunger device; Fast timing; RDDS