Spectroscopy of 57Co by γ-γ-recoil coincidences with the 40Ca(20Ne, 3pγ)-reaction and the 55Mn(α, 2nγ)-reaction

M. Rejmund, M. Lach, J.B. Fitzgerald, D. Fossan, M. Gorska, H. Grawe, J. Heese, K.H. Maier, W. Meczynski, M. Palacz, R. Schubart, K. Spohr, J. Styczen

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High spin states of 57Co have been studied with the 40Ca(20Ne, 3p) and 55Mn(α, 2n) reactions at 68 MeV and 25 MeV respectively. The first measurement used γ-γ-recoil coincidences with the OSIRIS γ-spectrometer and the Recoil Filter Detector (RFD). The RFD measured the velocity vector of the fusion evaporation residues; therefore an event by event Doppler correction could be applied with a significant improvement for the γ-energy resolution. The analysis of the γ-γ-recoil coincidence spectra resulted in 43 new γ-transitions of energies between 300 keV and 3300 keV that are assigned to 57Co and established 25 new excited states. Also a DCO analysis has been performed on the present data, however it does not lead to an unambiguous spin assignment for most states as the measured DCO-ratio is often compatible with different spin combinations. The reaction 55Mn(α, 2n) was studied with a compact setup of two Gedetectors. Singles γ- and γ-γ-coincidence spectra were measured. Mainly low spin states were populated, and 26 previously known γ-transitions as well as 21 excited states of 57Co have been confirmed. In this contribution results are presented on 57Co, the nucleus with two neutrons and one proton hole.
Original languageEnglish
Pages (from-to)151-154
Number of pages4
JournalActa Physica Polonica B
Issue number1-2
Publication statusPublished - 1996
Externally publishedYes


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