The two-body photodisintegration of 4He into a proton and a triton has been studied using the CEBAF Large-Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. 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 4He target. This is the first measurement of the photodisintegration of 4He above 0.4 GeV. The differential cross sections for the γ 4He → pt reaction were 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 3He that demonstrated the great importance of three-body mechanisms in the energy region 0.5–0.8 GeV.
Copyright © 2009 American Physical Society. This article first appeared in Physical Review C 80, no. 4 (October 7, 2009): 044603:1-11. doi:10.1103/PhysRevC.80.044603.
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Nasseripour, R., B. L. Berman, N. Benmouna, Y. Ilieva, J. M. Laget, K. P. Adhikari, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, H. Baghdasaryan, J. Ball, M. Battaglieri, I. Bedlinskiy, A. S. Biselli, C. Bookwalter, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, S. L. Careccia, D. S. Carman, P. L. Cole, P. Collins, P. Corvisiero, A. D'angelo, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, B. Dey, S. Dhamija, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, R. Dupre, G. Fedotov, S. Fegan, R. Fersch, A. Fradi, M. Y. Gabrielyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, L. Guo, H. Hakobyan, C. Hanretty, N. Hassall, D. Heddle, K. Hicks, C. E. Hyde, D. G. Ireland, E. L. Isupov, S. S. Jawalkar, J. R. Johnstone, K. Joo, D. Keller, M. Khandaker, P. Khetarpal, W. Kim, A. Klein, F. J. Klein, V. Kubarovsky, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, K. Livingston, H. Y. Lu, M. Mayer, M. E. McCracken, B. McKinnon, T. Mineeva, M. Mirazita, V. Mokeev, K. Moriya, B. Morrison, E. Munevar, P. Nadel-Turonski, C. S. Nepali, S. Niccolai, G. Niculescu, I. Niculescu, M. R. Niroula, M. Osipenko, A. I. Ostrovidov, K. Park, S. Park, E. Pasyuk, S. Anefalos Pereira, S. Pisano, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, Y. Prok, D. Protopopescu, B. A. Raue, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, J. Salamanca, C. Salgado, R. A. Schumacher, H. Seraydaryan, Y. G. Sharabian, D. I. Sober, D. Sokhan, S. Stepanyan, S. S. Stepanyan, P. Stoler, S. Strauch, R. Suleiman, M. Taiuti, D. J. Tedeschi, S. Tkachenko, M. Ungaro, M. F. Vineyard, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, J. Zhang, B. Zhao, and Z. W. Zhao. "Photodisintegration of 4He into p + t." Physical Review C 80, no. 4 (October 7, 2009): 044603:1-11. doi:10.1103/PhysRevC.80.044603.