Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Structure and Dynamics of Nuclei X

HK 61.2: Talk

Thursday, March 31, 2022, 14:30–14:45, HK-H6

Lifetime measurement of the 2₁⁺ state 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. Cortés¹, L.M. Fraile⁵, C. Fransen⁴, A. Gozzelino³, E.T. Gregor³, A. Illana³, J. Jolie⁴, L. Knafla⁴, R. Menegazzo³, D. Mengoni^2,3, C. Müller-Gatermann^4,6, O. Papst¹, G. Pasqualato⁷, C.M. Petrache⁸, N. Pietralla¹, F. Recchia^2,3, D. Testov^2,7, J.J. Valiente-Dobón³, and I. Zanon^2,3,9 — ¹IKP, TU Darmstadt — ²Uni Padova, Italy — ³INFN, LNL, Italy — ⁴IKP, Uni Köln — ⁵Uni Madrid, Spain — ⁶ANL, USA — ⁷INFN, Padova, Italy — ⁸Uni Paris-Saclay, France — ⁹Uni Ferrara, Italy

Recent measurements of the mean lifetimes of the first 2⁺ states in the region of the Hf and W isotopic chains pointed out a change of the previously measured mean lifetimes by enhanced experimental techniques. This results in an increased value of the E2 transition probability from N=114 down to N=98 with an unexpected sudden drop in the transition probability at N=96, i.e. ¹⁷⁰W. The experiment to remeasure the mean lifetime of the 2₁⁺ state of ¹⁷⁰W with the RDDS method was carried out at the Laboratori Nazionali di Legnaro (LNL). The GALILEO array, comprised of 24 HPGe detectors placed in 5 rings, was used in conjunction with the LNL plunger device. Experimental results are compared to predictions of the CBS model.

*Supported by the BMBF under Grant Nos. 05P18RDFN9 and 05P21RDFN9.