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Nuclear deorientation for heavy ions recoiling in vacuum and low pressure gas |
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| Authors: | R Brenn H Spehl A Weckherlin H A Doubt G van Middelkoop |
| Institution: | 1. Fakult?t für Physik der Universit?t Freiburg, West-Germany 2. Fysisch Laboratorium, Rijksuniversiteit Utrecht, The Netherlands 3. Nuclear Physics Laboratory, OX 1-3 RH, Oxford, Great Britain 4. Van de Graaff Laboratory, Sorbonnelaan 4, Utrecht, The Netherlands |
| Abstract: | Time-differential perturbed gamma-ray angular correlations have been measured for148, 150Nd(2 1 + ) recoiling into vacuum and into helium (ν/c=1.3%) in the pressure region from 0.75 to 25 Torr. A model is presented of the perturbation mechanism for recoils travelling in vacuum, which allows for the hitherto hidden fact that a hard core of the attenuation exists. In addition, a higher order modification of the first order Abragam and Pound theory for random perturbations has to be taken into account at very low pressure. |
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