Evidence for an Isomeric 3/2- State in 53Co

Dirk Rudolph, Robert Hoischen, Margareta Hellström, S Pietri, Zs Podolyak, P H Regan, A B Garnsworthy, S J Steer, F Becker, P Bednarczyk, L Caceres, P Doornenbal, J Gerl, M Gorska, J Grebosz, I Kojouharov, N Kurz, W Prokopowicz, H Schaffner, H J WollersheimLise-Lotte Andersson, L Atanasova, D L Balabanski, M A Bentley, A Blazhev, C Brandau, J R Brown, Claes Fahlander, Emma Johansson, A Jungclaus

Research output: Contribution to journalArticlepeer-review


The fragmentation of a 550MeV/u primary beam of Ni-58 on a Be-9 target has been used to measure time-and energy-correlated gamma decays following the implantation of event-by-event discriminated secondary fragments into a Be-9 stopper plate. A new isomeric gamma decay with T-1/2 = 14(6 4) ns and E-gamma = 646.2(2) keV is observed and attributed to the decay of the yrast 3/2-state in Co-53(27)26. This short-lived isomeric state has been populated by means of nuclear reactions during the stopping process of the secondary fragments. The experimental findings are discussed in the framework of large-scale spherical shell model calculations in conjunction with isospin symmetry-breaking residual interactions for the A = 53, Tz = +/- 1/2 mirror nuclei Co-53 and Fe-53.
Original languageEnglish
Pages (from-to)131-138
JournalEuropean Physical Journal A. Hadrons and Nuclei
Issue number2
Publication statusPublished - 2008

Subject classification (UKÄ)

  • Subatomic Physics


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