Experimental observation of the M1 scissors mode in 254No
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
Julkaistu sarjassa
Physics Letters BPäivämäärä
2022Tekijänoikeudet
© 2022 The Author(s). Published by Elsevier B.V. Funded by SCOAP3.
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.
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ElsevierISSN Hae Julkaisufoorumista
0370-2693Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/156983441
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The authors would like to thank the staff of the Accelerator Laboratory of the University of Jyväskylä for providing the 48Ca beam during the two weeks of experiment. F. L. B. G., A. C. L., B. V. K., J. E. M. and T. R. gratefully acknowledge funding of this research by the European Research Council through ERC-STG-2014 under grant agreement no. 637686. The use of the GAMMAPOOL loan pool germanium detectors is acknowledged. This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Programme (2012-2017). Support has also been provided by the EU 7th Framework Programme Project No. 262010 (ENSAR) and the Norwegian Research Council project 263030. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. ...Lisenssi
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