Two-body Photodisintegration of ${}^4$He with Full Final State Interaction

Abstract

The cross sections of the processes ${}^4$He($\gamma ,p$)${}^3$H and ${}^4$He($\gamma ,n$)${}^3$He are calculated taking into account the full final state interaction via the Lorentz integral transform (LIT) method. This is the first consistent microscopic calculation beyond the three--body breakup threshold. The results are obtained with a semirealistic central NN potential including also the Coulomb force. The cross sections show a pronounced dipole peak at 27 MeV which lies within the rather broad experimental band. At higher energies, where experimental uncertainties are considerably smaller, one finds a good agreement between theory and experiment. The calculated sum of three-- and four--body photodisintegration cross sections is also listed and is in fair agreement with the data.

arXiv comment18 pages, 6 figures

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• 4He experiments can serve as a database for determining the three-nucleon force
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• Uncertainty quantification in electromagnetic observables of nuclei
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