Nuclear rotation at the fission limit in Rf254

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.

doi:10.1103/physrevc.107.l061302

Nuclear rotation at the fission limit in Rf 254

Journal Article · Fri Jun 09 00:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.107.l061302· OSTI ID:2328530

Seweryniak, D.; ; ; ; Back, B. B.; Carpenter, M. P.; Chowdhury, P.; Clark, R. M.; ; ; Hauschild, K.; He, X. -T.; Khoo, T. L.; ; ; Lauritsen, T.; Li, J.; Morse, C.; Potterveld, D. H.; Savard, G. more »

A ground-state rotational band in the fissile nucleus Rf254 was observed for the first time. Levels up to spin 14 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357

OSTI ID:: 2328530

Alternate ID(s):: OSTI ID: 2349450

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 107; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Nuclear rotation at the fission limit in Rf 254

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