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Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance

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arxiv nucl-ex/0405026 v1 pith:AF7R7J7H submitted 2004-05-25 nucl-ex

A. Shafi , S. Prakhov , I.I. Strakovsky , W.J. Briscoe , B.M.K. Nefkens , C.E. Allgower , R.A. Arndt , V. Bekrenev
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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
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keywords gammabeendatainversemultipolespionresonancealternating
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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.

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