Photoproduction of π^0 -pairs off protons and off neutrons

M. Dieterle, M. Oberle, J. Ahrens, J. R. M. Annand, H. J. Arends, K. Bantawa,P. A. Bartolome, R. Beck, V. Bekrenev, H. Berghäuser, A. Braghieri, D. Branford,W. J. Briscoe, J. Brudvik, S. Cherepnya, S. Costanza, B. Demissie, E. J. Downie, P. Drexler, L. V. Fil’kov,A. Fix,S. Garni,D. I. Glazier, D. Hamilton, E. Heid, D. Hornidge, D. Howdle, G. M. Huber,O. Jahn, T. C. Jude, A. Käser, V. L. Kashevarov,I. Keshelashvili, R. Kondratiev, M. Korolija,B. Krusche,V. Lisin, K. Livingston, I. J. D. MacGregor, Y. Maghrbi, J. Mancell, D. M. Manley, Z. Marinides,J. C. McGeorge, E. McNicoll, D. Mekterovic, V. Metag,S. Micanovic, D. G. Middleton, A. Mushkarenkov, A. Nikolaev, R. Novotny, M. Ostrick, P. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski,S. Prakhov,J. Robinson, T. Rostomyan, S. Schumann, M. H. Sikora, D. I. Sober,A. Starostin, Th. Strub, I. Supek, M. Thiel, A. Thomas,M. Unverzagt,N. K. Walford, D. P. Watts, D. Werthmüller, L. Witthauer

The European Physical Journal A（2015）

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摘要

. Total cross sections, angular distributions, and invariant-mass distributions have been measured for the photoproduction of π^0π^0 pairs off free protons and off nucleons bound in the deuteron. The experiments were performed at the MAMI accelerator facility in Mainz using the Glasgow photon tagging spectrometer and the Crystal Ball/TAPS detector. The accelerator delivered electron beams of 1508 and 1557MeV, which produced bremsstrahlung in thin radiator foils. The tagged photon beam covered energies up to 1400MeV. The data from the free proton target are in good agreement with previous measurements and were only used to test the analysis procedures. The results for differential cross sections (angular distributions and invariant-mass distributions) for free and quasi-free protons are almost identical in shape, but differ in absolute magnitude up to 15

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