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Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Structure and Dynamics of Nuclei V

HK 19.2: Vortrag

Dienstag, 12. März 2024, 16:15–16:30, HBR 19: C 5b

Lifetime determination of yrast states of 170W — •K.E. Ide1, V. Werner1, A. Goasduff2,3, J. Wiederhold1, P.R. John1, D. Bazzacco3, M. Beckers4, J. Benito5, M. Berger1, D. Brugnara2,3, M.L. Cortés3, L.M. Fraile5, C. Fransen4, A. Gozzelino3, E.T. Gregor3, A. Illana3, J. Jolie4, L. Knafla4, H. Mayr1, R. Menegazzo3, D. Mengoni2,3, C. Müller-Gatermann4,6, C.M. Nickel1, O. Papst1, G. Pasqualato7, C.M. Petrache8, N. Pietralla1, F. Recchia2,3, T. Stetz1, D. Testov2,7, J.J. Valiente-Dobón3, and I. Zanon2,3,91IKP, TU Darmstadt — 2U Padova, Italy — 3INFN, LNL, Italy — 4IKP, U Köln — 5U Madrid, Spain — 6ANL, USA — 7INFN, Padova, Italy — 8U Paris-Saclay, France — 9U Ferrara, Italy

Nuclear quadrupole collectivity is identified from enhanced E2 decay rates. The B(E2;21+→01+) value is obtained from the 21+ state’s lifetime, τ(21+). Recent measurements of τ(21+) of Hf and W isotopes revealed discrepancies to literature. We measured 170W at LNL with the GALILEO array and plunger. Our τ(21+) result of 170W96 confirms the B(E2) literature value. The strongly different B(E2) value for 172W would imply a sudden E2 strength increase between N=96 and N=98 for W isotopes, in contrast to the gradual evolution in the Hf isotopes. After the initial τ(21+) analysis, systematic effects have been investigated and the analysis of higher yrast band members was finalized. The results are compared to CBS model predictions.

*Supported by the BMBF under Grant Nos. 05P21RDFN9, 05P21RDFN1 and 05P21PKFN1.

Keywords: 170W; GALILEO array and plunger; RDDS; DDCM; CBS model

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