Garrote, FL Bello, Lopez-Martens, A, Larsen, AC, Deloncle, I, Peru, S, Zeiser, F, Greenlees, PT, Kheswa, BV, Auranen, K, Bleuel, DL et al (show 29 more authors)
(2022)
Experimental observation of the M1 scissors mode in <SUP>254</SUP>No.
PHYSICS LETTERS B, 834.
p. 137479.
ISSN 0370-2693, 1873-2445
Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Scissors mode, ?-strength function, Transfermium nuclides |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 07 Oct 2022 15:15 |
| Last Modified: | 07 Dec 2024 23:19 |
| DOI: | 10.1016/j.physletb.2022.137479 |
| Open Access URL: | https://doi.org/10.1016/j.physletb.2022.137479 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3165271 |
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