A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Experimental observation of the M1 scissors mode in 254No (2022)
Bello, G. F., Lopez-Martens, A., Larsen, A.C., Deloncle, I., Péru, S., Zeiser, F., Greenlees, P.T., Kheswa, B.V., Auranen, K., Bleuel, D.L., Cox, D.M., Crespo, C. L., Giacoppo, F., Görgen, A., Grahn, T., Guttormsen, M., Hagen, T.W., Harkness-Brennan, L., Hauschild, K., . . . Uusitalo, J. (2022). Experimental observation of the M1 scissors mode in 254No. Physics Letters B, 834, Article 137479. https://doi.org/10.1016/j.physletb.2022.137479
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Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Bello, Garrote F.L.; Lopez-Martens, A.; Larsen, A.C.; Deloncle, I.; Péru, S.; Zeiser, F.; Greenlees, P.T.; Kheswa, B.V.; Auranen, K.; Bleuel, D.L.; et al.
Lehti tai sarja: Physics Letters B
ISSN: 0370-2693
eISSN: 1873-2445
Julkaisuvuosi: 2022
Volyymi: 834
Artikkelinumero: 137479
Kustantaja: Elsevier
Julkaisumaa: Alankomaat
Julkaisun kieli: englanti
DOI: https://doi.org/10.1016/j.physletb.2022.137479
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/83504
Tiivistelmä
We present the first experimental evidence of the scissors mode in the superheavy nucleus 254No produced in the 208Pb(48Ca, 2nγ))254No reaction. The spectrum of γ rays emitted by the excited 254No nuclei shows an enhanced γ-ray yield for transition energies of ≈2.5 MeV. By measuring the linear polarization properties of the emitted γ rays, we confirm that the transitions in the enhancement region are predominantly of magnetic-dipole character, characteristic for the scissors mode. To further characterize the enhanced γ-ray yield, simulations of the electromagnetic decay of 254No were performed. The observed enhancement is reproduced by including an M1 component in the γ strength function with total strength B(M1↑)=11.8(19)μN2. This is in good agreement with the integrated M1 strength from sum-rule estimates and new calculations within the quasi-particle random-phase approximation presented here. Our results provide a stringent test of phenomenological formulae for the scissors mode currently used in stellar nucleosynthesis calculations. We find that those formulae are not satisfactory, and we recommend using sum-rule estimates assuming a rigid-body moment of inertia instead for describing the scissors mode in superheavy nuclei.
YSO-asiasanat: ydinfysiikka
Vapaat asiasanat: scissors mode; γ-strength function; transfermium nuclides
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2022
JUFO-taso: 2
