Elsevier

Nuclear Physics A

Volume 501, Issue 1, 11 September 1989, Pages 118-136
Nuclear Physics A

Side-feeding times and level lifetimes measured in the reaction 54Fe(32S, 3p)83Y

https://doi.org/10.1016/0375-9474(89)90568-XGet rights and content

Abstract

We have performed recoil-distance and Doppler-shift-attenuation lifetime measurements in the reaction 54Fe(32S, 3p)83Y at 103–107 MeV beam energy. By analyzing the Doppler-broadened line shapes of the 964 keV 212+172+ yrast transition in coincidence with feeding and depopulating transitions, the average side-feeding time and lifetime of this state have been deduced as τF = 0.6(2) ps and τ = 0.62(10) ps, respectively. A similar analysis of the 811 keV 172+ 132+ transition gave values of τF = 0.65(25) ps and τ = 1.5(2) ps, respectively for the 172+ yrast state. Feeding times of the higher transitions in the positive-parity yrast band have been estimated from their Dopplerbroadened lineshapes measured in coincidence with depopulating transitions only. The feeding times are compared with the results of Monte Carlo calculations of the time development of the continuum γ-ray flux, and a damping width of 2–3 MeV has been deduced. The measured level lifetimes support the regular band structures with the deformation β2 = 0.33 previously inferred from the transition energies.

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    Supported by Deutsches Bundesministerium für Forschung und Technologie under contracts 06 Gö 456 and 06 K 202.

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