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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
Abstract : 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.
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Submitted on : Monday, March 7, 2011 - 11:17:34 AM
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R. Nasseripour, B.L. Berman, K.P. Adhikari, D. Adikaram, M. Anghinolfi, et al.. Coherent Photoproduction of $\pi^+$ from $^3$He. Physical Review C, American Physical Society, 2011, 83, pp.034001. ⟨10.1103/PhysRevC.83.034001⟩. ⟨in2p3-00573745⟩



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