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Evidence for an isomeric 3/2- state in 53Co |
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| Authors: | D. Rudolph R. Hoischen M. Hellström S. Pietri Zs. Podolyák P. H. Regan A. B. Garnsworthy S. J. Steer F. Becker P. Bednarczyk L. Cáceres P. Doornenbal J. Gerl M. Górska J. Grebosz I. Kojouharov N. Kurz W. Prokopowicz H. Schaffner H. J. Wollersheim L. -L. Andersson L. Atanasova D. L. Balabanski M. A. Bentley A. Blazhev C. Brandau J. R. Brown C. Fahlander E. K. Johansson A. Jungclaus |
| Affiliation: | 1. Department of Physics, Lund University, S-221 00, Lund, Sweden 2. Gesellschaft für Schwerionenforschung mbH, D-64291, Darmstadt, Germany 3. Department of Physics, University of Surrey, GU2 7XH, Guildford, United Kingdom 4. Wright Nuclear Structure Laboratory, Yale University, 06520-8124, New Haven, CT, USA 5. Institute of Nuclear Physics (IFJ PAN), The Henryk Niewodniczański, PL-31342, Kraków, Poland 6. Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049, Madrid, Spain 7. Institut für Kernphysik, Universit?t zu K?ln, D-50937, K?ln, Germany 8. Faculty of Physics, University of Sofia, BG-1164, Sofia, Bulgaria 9. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784, Sofia, Bulgaria 10. Department of Physics, University of York, YO10 5DD, York, UK |
| Abstract: | The fragmentation of a 550MeV/u primary beam of 58Ni on a 9Be target has been used to measure time- and energy-correlated γ decays following the implantation of event-by-event discriminated secondary fragments into a 9Be stopper plate. A new isomeric γ decay with T 1/2 = 14(  ) ns and E γ = 646.2(2) keV is observed and attributed to the decay of the yrast 3/2- state in 53 27Co26 . 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 , T z = ±1/2 mirror nuclei 53Co and 53Fe . |
| Keywords: | PACS. 21.60.Cs Shell model 23.20.-g Electromagnetic transitions 25.70.Mn Projectile and target fragmentation 27.40.+z 39 ⩽ A ⩽ 58 |
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