Coherent Photoproduction of $\pi^+$ from $^3$He

R. Nasseripour , B.L. Berman , K.P. Adhikari , D. Adikaram , M. Anghinolfi , J. Ball (1) , M. Battaglieri , V. Batourine , I. Bedlinskiy , A.S. Biselli , D. Branford , W.J. Briscoe , W.K. Brooks , V.D. Burkert , D.S. Carman , L. Casey , P.L. Cole , P. Collins , V. Crede , A. d'Angelo , A. Daniel , N. Dashyan , R. de Vita , E. de Sanctis , A. Deur , B. Dey , R. Dickson , C. Djalali , D. Doughty , R. Dupre , H. Egiyan , A. El Alaoui , L. El Fassi , S. Fegan , A. Fradi (2) , M.Y. Gabrielyan , G.P. Gilfoyle , K.L. Giovanetti , F.X. Girod , J.T. Goetz , W. Gohn , R.W. Gothe , L. Graham , K.A. Griffioen , B. Guegan , K. Hafidi , H. Hakobyan , C. Hanretty , D. Heddle , M. Holtrop , C. E. Hyde , Y. Ilieva , D.G. Ireland , E.L. Isupov , D. Keller , M. Khandaker , P. Khetarpal , A. Kim , W. Kim , A. Klein , F.J. Klein , P. Konczykowski (1) , V. Kubarovsky , S.E. Kuhn , S.V. Kuleshov , V. Kuznetsov , N.D. Kvaltine , K. Livingston , H.Y. Lu , I.J.D. Macgregor , M. Mayer , J. Mcandrew , B. Mckinnon , A.M. Micherdzinska , M. Mirazita , K. Moriya , B. Moreno (1) , B. Morrison , H. Moutarde (1) , E. Munevar , P. Nadel-Turonski , A. Ni , S. Niccolai (2) , G. Niculescu , I. Niculescu , M. Osipenko , A.I. Ostrovidov , M. Paolone , R. Paremuzyan , K. Park , S. Park , E. Pasyuk , S. Anefalos Pereira , Y. Perrin (3) , S. Pisano (2) , S. Pozdniakov , J.W. Price , S. Procureur (1) , D. Protopopescu , M. Ripani , B.G. Ritchie , G. Rosner , P. Rossi , F. Sabatié (1) , M.S. Saini , C. Salgado , D. Schott , R.A. Schumacher , H. Seraydaryan , Y.G. Sharabian , E.S. Smith , G.D. Smith , D.I. Sober , D. Sokhan , S.S. Stepanyan , S. Stepanyan , P. Stoler , S. Strauch , R. Suleiman , M. Taiuti , W. Tang , C.E. Taylor , D.J. Tedeschi , S. Tkachenko , M. Ungaro , B. Vernarsky , M.F. Vineyard , E. Voutier (3) , D.P. Watts , L.B. Weinstein , D.P. Weygand , M.H. Wood , B. Zhao , Z.W. Zhao

1 DPHN - Département de Physique Nucléaire (ex SPhN)
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

We have measured the differential cross section for the $\gamma$$^3$He$\rightarrow \pi^+ t$ reaction. This reaction was studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Real photons produced with the Hall-B bremsstrahlung tagging system in the energy range from 0.50 to 1.55 GeV were incident on a cryogenic liquid $^3$He target. The differential cross sections for the $\gamma$$^3$He$\rightarrow \pi^+ t$ reaction were measured as a function of photon-beam energy and pion-scattering angle. Theoretical predictions to date cannot explain the large cross sections except at backward angles, showing that additional components must be added to the model.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

R. Nasseripour, B.L. Berman, K.P. Adhikari, D. Adikaram, M. Anghinolfi, et al.. Coherent Photoproduction of $\pi^+$ from $^3$He. Physical Review C, 2011, 83, pp.034001. ⟨10.1103/PhysRevC.83.034001⟩. ⟨in2p3-00573745⟩