DSA lifetime measurements in21Ne at high recoil velocity |
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Authors: | H Grawe F Heidinger K Kändier |
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Institution: | 1. Fakult?t für Physik der Universit?t Freiburg, W.-Germany 2. FU Berlin and Hahn-Meitner-Institut für Kernforschung, Germany
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Abstract: | States in21Ne up to 5 MeV excitation energy have been populated using the inverted reaction2H(20Ne,pγ). The Doppler shift attenuation (DSA) analysis of thepγ coincidence spectra taken in a Ge(Li) detector at 45° and 135° and an annular silicon surface barrier detector near 0° yielded the lifetimes of 8 states in21Ne. Due to the large recoil ofπ i/c~ 4% three new lifetimes were determined for the short lived levels at 2.80, 4.68 and 4.73 MeV, namely 10±4 fs, 16±4 fs and 10±4 fs, respectively. The results are compared with rotational and shell model calculations. |
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