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

2-s2.0-85073551510This 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 Authors1643549, 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 DepositionThis 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