Photodisintegration of $^4$He into p+t

• Main Authors: Nasseripour, R, Berman, B. L, Benmouna, N, Ilieva, Y, Laget, J. -M
• Format: Journal Article
• Language: English
• Published: 20.07.2009
• Subjects: Physics - Nuclear Experiment
• DOI: 10.48550/arxiv.0907.3433

Phys.Rev.C80:044603,2009 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 .