Nuclear rotation at the fission limit in
| Autor: | Seweryniak, D, Huang, T, Auranen, K, Ayangeakaa, A.D, Back, B.B, Carpenter, M.P, Chowdhury, P, Clark, R.M, Copp, P.A, Favier, Z, Hauschild, K, He, X.-T, Khoo, T.L, Kondev, F.G, Korichi, A, Lauritsen, T, Li, J, Morse, C, Potterveld, D.H, Savard, G, Stolze, S, Wu, J, Zhang, J, Xu, Y.-F |
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| Přispěvatelé: | Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys.Rev.C Phys.Rev.C, 2023, 107 (6), pp.L061302. ⟨10.1103/PhysRevC.107.L061302⟩ |
| DOI: | 10.1103/PhysRevC.107.L061302⟩ |
| Popis: | International audience; A ground-state rotational band in the fissile nucleus Rf254 was observed for the first time. Levels up to spin 14ℏ and excitation energy of 1.56 MeV were observed. The Rf254 nuclei were produced using the Pb206(Ti50,2n) fusion-evaporation reaction. It is the weakest reaction channel ever studied using in-beam γ-ray spectroscopic methods. The reaction products were separated from the beam in the Argonne gas-filled analyzer (AGFA). The Rf254 nuclei were implanted into a double-sided Si strip detector at the AGFA focal plane and tagged with subsequent ground-state spontaneous fission decays using temporal and spatial correlations. Prompt γ rays in coincidence with the Rf254 recoils were detected in the Gammasphere array of Ge detectors. In order to identify the ground-state rotational band in Rf254, a method for identifying rotational bands in low statistics γ-ray spectra was developed. The deduced Rf254 kinematic moment of inertia is smaller compared to neighboring even-even nuclei. This is most likely associated with a slightly lower quadrupole deformation and stronger pairing correlations in Rf254. The behavior of the moment of inertia as a function of rotational frequency is similar to that of the lighter N=150 isotones Fm250 and No252. |
| Databáze: | OpenAIRE |
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