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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 |
| Institution: | 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" target="_blank">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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