Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei

Abstract

2-s2.0-85073551510 ; This letter reports lifetime measurements of excited states in the odd-N nucleus 163W using the recoil-distance Doppler shift method to probe the core polarising effect of the i13/2 neutron orbital on the underlying soft triaxial even-even core. The ratio B(E2:21/2+?17/2+)/B(E2:17/2+?13/2+) is consistent with the predictions of the collective rotational model. The deduced B(E2) values provide insights into the validity of collective model predictions for heavy transitional nuclei and a geometric origin for the anomalous B(E2) ratios observed in nearby even-even nuclei is proposed. © 2019 The Authors ; 1643549, 1796822, ST/G008671/1, ST/G008787/1, ST/P005101/1 ENSAR2 117F508 Array BioPharma Horizon 2020 Framework Programme, H2020: 654002 Science and Technology Facilities Council, STFC: ST/L005670/1, ST/L005794/1, ST/P004598/1 Academy of Finland Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK Finnish Centre of Excellence in Atomic Layer Deposition ; This work has been supported by the UK Science and Technology Facilities Council under grants ST/P004598/1, ST/L005670/1 and ST/L005794/1; the Scientific and Technological Research Council of Turkey (TUBITAK Project No: 117F508); the EU HORIZON2020 programme ?Infrastructures?, project number: 654002 (ENSAR2) and by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL). The UK/France (STFC/IN2P3) Loan Pool and GAMMAPOOL network are acknowledged for the HPGe escape-suppressed detectors of the JUROGAM II array. ; This work has been supported by the UK Science and Technology Facilities Council under grants ST/P004598/1 , ST/L005670/1 and ST/L005794/1 ; the Scientific and Technological Research Council of Turkey (TUBITAK Project No: 117F508 ); the EU HORIZON2020 programme "Infrastructures", project number: 654002 (ENSAR2) and by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL). The UK/France (STFC/IN2P3) Loan Pool and GAMMAPOOL network are acknowledged for the HPGe escape-suppressed detectors of the JUROGAM II array.