Experimental observation of the M1 scissors mode in 254No

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.; Cox, D. M.; Crespo Campo, L.; Giacoppo, F.; Görgen, A.; Grahn, T.; Guttormsen, M.; Hagen, T. W.; Harkness-Brennan, L.; Hauschild, K.; Henning, G.; Herzberg, R. -D.; Julin, R.; Juutinen, S.; Laplace, T. A.; Leino, M.; Midtbø, J. E.; Modamio, V.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Renstrøm, T.; Rezynkina, K.; Sandzelius, M.; Sarén, J.; Scholey, C.; Siem, S.; Sorri, J.; Stolze, S.; Uusitalo, J.

doi:10.1016/j.physletb.2022.137479

Title: Experimental observation of the M1 scissors mode in 254No

Journal Article · Tue Nov 01 00:00:00 EDT 2022 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2022.137479· OSTI ID:1891679

; Lopez-Martens, A.;

; Deloncle, I.; Péru, S.;

; Greenlees, P. T.; Kheswa, B. V.; Auranen, K.;

;

; Crespo Campo, L.;

;

; Grahn, T.;

; Hagen, T. W.;

;

We present the first experimental evidence of the scissors mode in the superheavy nucleus ²⁵⁴No produced in the ²⁰⁸Pb(⁴⁸Ca, 2$$\mathcal{n}\gamma$$))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 $$B(M1\uparrow) = 11.8(19) \mu^{2}_{N}$$. 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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); European Research Council (ERC); Academy of Finland; Science and Technology Facilities Council (STFC)

Grant/Contract Number:: AC52-07NA27344; 637686

OSTI ID:: 1891679

Alternate ID(s):: OSTI ID: 1891724

Report Number(s):: LLNL-JRNL-826474; S037026932200613X; 137479; PII: S037026932200613X

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 834 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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