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

Summary, in English

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.

• Author: 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 Wollersheim; Lise-Lotte Andersson; L Atanasova; D L Balabanski; M A Bentley; A Blazhev; C Brandau; J R Brown; Claes Fahlander; Emma Johansson; A Jungclaus
• Department/s: Nuclear physics; Dept of Physical Geography and Ecosystem Science
• Publishing year: 2008
• Language: English
• Pages: 131-138
• Publication/Series: European Physical Journal A. Hadrons and Nuclei
• Volume: 36
• Issue: 2
• Links: http://dx.doi.org/10.1140/epja/i2008-10587-4
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics
• Status: Published
• Project: Isotope-selective Spectroscopy: Fast Timing R&D and fp-Shell Mirror Isomers
• Research group: Nuclear Structure
• ISBN/ISSN/Other: ISSN: 1434-6001