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Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance
A. Shafi ; S. Prakhov ; I.I. Strakovsky ; W.J. Briscoe ; B.M.K. Nefkens ; C.E. Allgower ; R.A. Arndt ; V. Bekrenev ; C. Bennhold ; M. Clajus ; J.R. Comfort ; K. Craig ; D. Grosnick ; D. Isenhower ; N. Knecht ; D.D. Koetke ; A. Kulbardis ; N. Kozlenko ; S. Kruglov ; G. Lolos ; I. Lopatin ; D.M. Manley ; R. Manweiler ; A. Marusic ; S. McDonald ; J. Olmsted ; Z. Papandreou ; D. Peaslee ; N. Phaisangittisaku ; J.W. Price ; A.F. Ramirez ; M. Sadler ; H. Spinka ; T.D.S. Stanislaus ; A. Starostin ; H.M. Staudenmaier ; I. Supek ; W.B. Tippens ; R.L. Workman ;
Date:	25 May 2004
Journal:	Phys.Rev. C70 (2004) 035204
Subject:	nucl-ex
Abstract:	Differential cross sections for the process pi^- p -> gamma n have been measured at Brookhaven National Laboratory’s Alternating Gradient Synchrotron with the Crystal Ball multiphoton spectrometer. Measurements were made at 18 pion momenta from 238 to 748 MeV/c, corresponding to E_gamma for the inverse reaction from 285 to 769 MeV. The data have been used to evaluate the gamma n multipoles in the vicinity of the N(1440) resonance. We compare our data and multipoles to previous determinations. A new three-parameter SAID fit yields 36 +/- 7 (GeV)^-1/2 X 10^-3 for the A^n_1/2 amplitude of the P_11.
Source:	arXiv, nucl-ex/0405026
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