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Decay studies of K isomers in 254No |
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| Authors: | F. P. He?berger S. Antalic B. Sulignano D. Ackermann S. Heinz S. Hofmann B. Kindler J. Khuyagbaatar I. Kojouharov P. Kuusiniemi M. Leino B. Lommel R. Mann K. Nishio A. G. Popeko ?. ?áro B. Streicher J. Uusitalo M. Venhart A. V. Yeremin |
| Affiliation: | 1. GSI, Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany 2. Department of Nuclear Physics and Biophysics, Comenius University Bratislava, 84248, Bratislava, Slovakia 3. Institut für Physik, Goethe-Universit?t Frankfurt, 60054, Frankfurt, Germany 4. St. Petersburg State University, 198504, Stari Peterhof, St. Petersburg, Russia 5. CUPP, University of Oulu, 90014, Oulu, Finland 6. Department of Physics, University of Jyv?skyl?, 40014, Jyv?skyl?, Finland 7. Japan Atomic Energy Agency, Tokai, 319-1184, Ibaraki, Japan 8. Flerov Laboratory of Nuclear Reactions, JINR, 141890, Dubna, Russia |
| Abstract: | A detailed $ gamma$ spectroscopic decay study of two K isomers in 254No was performed. In addition to the previously reported $ gamma$ lines two new transitions of E = 778 , 856keV could be attributed to the decay pattern of 254m1No ( T 1/2 = 275±7 ms). The population of an excited band built up on this isomer ( $ensuremath K^{pi} =8^{-}$ by the decay of 254m2No ( T 1/2 = 198±13 μs) could be proven by measuring delayed $ gamma$ - $ gamma$ coincidences between transitions stemming from the decay of both isomeric states. The energies of the band members could be established up to $ensuremath I^{pi} = 15^{-}$ . A spontaneous fission branch of (2.0±1.2)×10-4 was measured for 254m1No , an upper limit of $ le$ 1.2×10-4 was estimated for 254m2No . These values demonstrate the high stability of multi-quasiparticle configurations against spontaneous fission. Evidence for an $ alpha$ decay branch of 254m1No in the order of 1×10-4 was found. |
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