| Autor: |
Marchini, N., Nannini, A., Rocchini, M., Rodríguez, T.R., Ottanelli, M., Gelli, N., Perego, A., Benzoni, G., Blasi, N., Bocchi, G., Brugnara, D., Buccola, A., Carozzi, G., Goasduff, A., Gregor, E.T., John, P.R., Komorowska, M., Mengoni, D., Recchia, F., Riccetto, S., Rosso, D., Saltarelli, A., Siciliano, M., Valiente-Dobón, J.J., Zanon, I. |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Zdroj: |
Physics Letters B |
| Popis: |
The structure of $^{74}$Se 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 ρ2(E0;22+→21+)⋅103=210(130) value was deduced. This result, in addition to a low upper limit for the 03+→02+ electron transition, casts in doubt a simple interpretation of the $^{74}$Se 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 ρ2(E0;22+→21+) value, even if still a factor ≈7 smaller than the experiment. Triaxiality and a complex shape-coexistence and mixing scenario seem responsible for this unexpected experimental result. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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