دورية أكاديمية
Experimental observation of the M1 scissors mode in 254No
| العنوان: | Experimental observation of the M1 scissors mode in 254No |
|---|---|
| المؤلفون: | F.L. Bello Garrote, A. Lopez-Martens, A.C. Larsen, I. Deloncle, S. Péru, F. Zeiser, P.T. Greenlees, B.V. Kheswa, K. Auranen, D.L. Bleuel, D.M. Cox, L. Crespo Campo, F. Giacoppo, A. Görgen, T. Grahn, M. Guttormsen, T.W. Hagen, L. Harkness-Brennan, K. Hauschild, G. Henning, R.-D. Herzberg, R. Julin, S. Juutinen, T.A. Laplace, M. Leino, J.E. Midtbø, V. Modamio, J. Pakarinen, P. Papadakis, J. Partanen, T. Renstrøm, K. Rezynkina, M. Sandzelius, J. Sarén, C. Scholey, S. Siem, J. Sorri, S. Stolze, J. Uusitalo |
| المصدر: | Physics Letters B, Vol 834, Iss , Pp 137479- (2022) |
| بيانات النشر: | Elsevier, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Physics |
| مصطلحات موضوعية: | Scissors mode, γ-strength function, Transfermium nuclides, Physics, QC1-999 |
| الوصف: | 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0370-2693 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S037026932200613X; https://doaj.org/toc/0370-2693 |
| DOI: | 10.1016/j.physletb.2022.137479 |
| URL الوصول: | https://doaj.org/article/d0e93316f196432194cd3a02959da4b3 |
| رقم الأكسشن: | edsdoj.0e93316f196432194cd3a02959da4b3 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder كن أول من يترك تعليقا!