%0 Journal Article
%A Marchini, N.
%A Nannini, A.
%A Rocchini, M.
%A Rodríguez Frutos, Tomás Raúl
%A Ottanelli, M.
%A Gelli, N.
%A Perego, A.
%A Benzoni, G.
%A Blasi, N.
%A Bocchi, G.
%T Emergence of triaxiality in 74Se from electric monopole transition strengths
%D 2023
%@ 0370-2693
%U https://hdl.handle.net/20.500.14352/103225
%X 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.
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