Neutron Detection in the A2 Collaboration Experiment on Neutral Pion Photo-production on Neutron

Neutron detection is of crucial importance for the neutral pion photo-production study on a neutron target that now is in progress at MAMI. Two electro-magnetic calorimeters, based on NaI and BaF2 crystals, are used in the A2 experiment. While these calorimeters are optimized for pion decay photon detection, they have a reason able efficiency for neutron detection also. The paper describes the method, which has been used to measure this efficiency using the same data taken for pion photo-production study on deuterium target with tagged photon been of 800 MeV maximal energy. The detection efficiency is a rising function of neutron momentum that reaches 40% near 1 GeV/c.

References:

[1] Krusche B 2011 Photo-production of mesons off nuclei Eur. Phys. J. ST 198 199

[2] Strakovsky I et al 2016 Progress in Neutron EM Couplings. AIP Conf.Proc. 1735 040002

[3] Martemianov M et al 2015 A new measurement of the neutron detection efficiency for the NaI Crystal Ball detector. JINST 10 T04001

[4] Gabler A R et al 1994 Response of TAPS to monochromatic photons with energies between 45-MeV and 790-MeV Nucl. Instrum. Methods A 346 168

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W. J. Briscoe, M. Hadžimehmedović, A. E. Kudryavtsev, V. V. Kulikov, M. A. Martemianov, I. I. Strakovsky, A. Švarc, V. E. Tarasov, R. L. Workman, S. Abt, P. Achenbach, C. S. Akondi, F. Afzal, P. Aguar-Bartolomé, Z. Ahmed, J. R. M. Annand, H. J. Arends, K. Bantawa, M. Bashkanov, R. Beck, M. Biroth, N. Borisov, A. Braghieri, S. A. Bulychjov, F. Cividini, C. Collicott, S. Costanza, A. Denig, E. J. Downie, P. Drexler, S. Fegan, M. I. Ferretti Bondy, S. Gardner, D. Ghosal, D. I. Glazier, I. Gorodnov, W. Gradl, M. Günther, D. Gurevich, L. Heijkenskjöld, D. Hornidge, G. M. Huber, A. Käser, V. L. Kashevarov, S. Kay, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, S. Lutterer, I. J. D. MacGregor, R. Macrae, D. M. Manley, P. P. Martel, J. C. McGeorge, D. G. Middleton, R. Miskimen, E. Mornacchi, A. Mushkarenkov, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P. B. Otte, H. Osmanović, R. Omerović, B. Oussena, D. Paudyal, P. Pedroni, A. Powell, S. N. Prakhov, G. Ron, T. Rostomyan, A. Sarty, C. Sfienti, V. Sokhoyan, K. Spieker, J. Stahov, O. Steffen, I. Supek, A. Thiel, M. Thiel, A. Thomas, L. Tiator, M. Unverzagt, Yu. A. Usov, N. K. Walford, D. P. Watts, S. Wagner, D. Werthmüller, J. Wettig, M. Wolfes, N. Zachariou (2019)

Cross section for γn→π0n measured at the Mainz A2 experiment, Physical Review C

Volume: 100, Issue: 6

10.1103/PhysRevC.100.065205

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