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oai:docta.ucm.es:20.500.14352/1032252024-04-19T00:05:35Zcom_20.500.14352_14col_20.500.14352_15

Marchini, N. Nannini, A. Rocchini, M. Rodríguez Frutos, Tomás Raúl Ottanelli, M. Gelli, N. Perego, A. Benzoni, G. Blasi, N. Bocchi, G. 2024-04-18T16:57:49Z 2024-04-18T16:57:49Z 2023-09-10 0370-2693 10.1016/j.physletb.2023.138067 https://hdl.handle.net/20.500.14352/103225 1873-2445 https//doi.org/10.1016/j.physletb.2023.138067 https://www.sciencedirect.com/science/article/pii/S037026932300401X The structure of 74Se at low energy was investigated via spectroscopy of internal conversion electrons at the INFN Legnaro National Laboratories (LNL). A set of internal K-conversion coefficients and monopole transition strengths was measured. A large & rho;2(E0; 2+2-+ 2+1 ) & BULL; 103 = 210(130) value was deduced. This result, in addition to a low upper limit for the 0+3-+ 0+2 electron transition, casts in doubt a simple interpretation of the 74Se low-lying structure, in particular the recently proposed spherical, vibrational character. New microscopic beyond-mean-field calculations generally agree with the experimental results and are capable of producing a large & rho;2(E0; 2+2-+ 2+1 ) value, even if still a factor & AP;7 smaller than the experiment. Triaxiality and a complex shape-coexistence and mixing scenario seem responsible for this unexpected experimental result.& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3. eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 International Emergence of triaxiality in 74Se from electric monopole transition strengths journal article