Photodisintegration of $^4$He into p+t

Details Photodisintegration of $^4$He into p+t Photodisintegration of $^4$He into p+t

2009-07-20

arxiv.org/abs/0907.3433v1

Phys.Rev.C80:044603,2009

Physics

Nuclear Physics

Nuclear Experiment

13 pages submitted in one tgz file containing 2 tex file and 22 postscrip figures

Scientific paper

10.1103/PhysRevC.80.044603

The two-body photodisintegration of $^4$He into a proton and a triton has been studied using the CEBAF Large-Acceptance Spectrometer (CLAS) at Jefferson Laboratory. Real photons produced with the Hall-B bremsstrahlung-tagging system in the energy range from 0.35 to 1.55 GeV were incident on a liquid $^4$He target. This is the first measurement of the photodisintegration of $^4$He above 0.4 GeV. The differential cross sections for the $\gamma$$^4$He$\to pt$ reaction have been measured as a function of photon-beam energy and proton-scattering angle, and are compared with the latest model calculations by J.-M. Laget. At 0.6-1.2 GeV, our data are in good agreement only with the calculations that include three-body mechanisms, thus confirming their importance. These results reinforce the conclusion of our previous study of the three-body breakup of $^3$He that demonstrated the great importance of three-body mechanisms in the energy region 0.5-0.8 GeV .

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