Abstract
The threshold condition for pionic instabilities in finite nuclei is investigated by evaluating the response function for pion-like nuclear excitations (i.e. isovectorJ π=0−, 1+, 2−, ... excitations). The onset of pion condensation is then defined as the point where the response function for givenJ π becomes infinite at frequencyω=0. Using a momentum space representation for the response function which allows to establish clear connections to the nuclear matter case, we find that for angular momentaJ smaller than a maximum value which depends on the size of the nucleus, the threshold condition is almost the same as for infinite matter. We also study the systematics of this phenomenon as a function of nuclear mass number.
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Work supported in part by Deutsche Forschungsgemeinschaft under contract We 655/4
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Toki, H., Weise, W. Investigation of the pion condensation threshold in finite nuclei. Z Physik A 292, 389–395 (1979). https://doi.org/10.1007/BF01546438
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DOI: https://doi.org/10.1007/BF01546438