Phys.Rev. C 106, 024309 (2022)

J.Khuyagbaatar, H.Brand, Ch.E.Dullmann, F.P.Hessberger, E.Jager, B.Kindler, J.Krier, N.Kurz, B.Lommel, Yu.Nechiporenko, Yu.N.Novikov, B.Schausten, A.Yakushev

Search for fission from a long-lived isomer in ²⁵⁰No and evidence of a second isomer

RADIOACTIVITY ^250,250mNo(α), (SF)[from ²⁰⁴Pb(⁴⁸Ca, 2n), E=218.9 MeV, followed by separation of fragments using TASCA system at GSI facility]; measured evaporation residues (ERs), (ER)α- and (ER)(fission events)-correlations, T_1/2 of g.s. and two isomers using double-sided silicon strips detectors, and a multiwire proportional counter (MWPC). ^250,250mNo; deduced T_1/2, upper limit of fission (SF) branching of 23-μs isomer, new shorter-lived high-K isomer. Discussed nonobservation of fission branching of the long-lived isomer, and fission-hindrance factor due to K-quantum number with theoretical predictions from various semiempirical approaches.

doi: 10.1103/PhysRevC.106.024309