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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. Goasduff^2,3, J. Wiederhold¹, P.R. John¹, D. Bazzacco³, M. Beckers⁴, J. Benito⁵, M. Berger¹, D. Brugnara^2,3, M.L. Cortés³, L.M. Fraile⁵, C. Fransen⁴, A. Gozzelino³, E.T. Gregor³, A. Illana³, J. Jolie⁴, L. Knafla⁴, H. Mayr¹, R. Menegazzo³, D. Mengoni^2,3, C. Müller-Gatermann^4,6, C.M. Nickel¹, O. Papst¹, G. Pasqualato⁷, C.M. Petrache⁸, N. Pietralla¹, F. Recchia^2,3, T. Stetz¹, D. Testov^2,7, J.J. Valiente-Dobón³, and I. Zanon^2,3,9 — ¹IKP, 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