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Helicity-Dependent Cross Sections for the Photoproduction of π0 Pairs from Nucleons

(A2 Collaboration) Dieterle, M.; Witthauer, L.; Fix, A.; Abt, S.; Achenbach, P.; Adlarson, P.; Afzal, F.; Bartolome, P. Aguar; Ahmed, Z.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Dolzhikov, A. S.; Downie, E. J.; Drexler, P.; Gardner, S.; Ghosal, D.; Glazier, D. I.; Gorodnov, I.; Gradl, W.; Gunther, M.; Gurevich, D.; Heijkenskjoed, L.; Hornidge, D.; Huber, G. M.; Kaser, A.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A.; Lisin, V.; Livingston, K.; Lutterer, S.; MacGregor, I. J. D.; Manley, D. M.; Martel, P. P.; Metag, V.; Meyer, W.; Middleton, D. G.; Miskimen, R.; Mornacchi, E.; Mullen, C.; Mushkarenkov, A.; Neganov, A.; Neiser, A.; Oberle, M.; Ostrick, M.; Otte, P. B.; Paudyal, D.; Pedroni, P.; Polonski, A.; Powell, A.; Prakhov, S. N.; Reicherz, G.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, T.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Watts, D. P.; Werthmuller, D.; Wettig, J.; Wolfes, M.; Zana, L. A. (2020) Helicity-Dependent Cross Sections for the Photoproduction of π0 Pairs from Nucleons. Physical review letters, 125 (6). ISSN 0031-9007

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We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300~--~700~MeV provides the first measurement of recoil neutron polarisation at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms.

Item Type: Article
Uncontrolled Keywords: spin polarization ; neutron ; photodisintegration ; Crystal Ball at MAMI
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Depositing User: Ivan Supek
Date Deposited: 31 May 2021 12:19
DOI: 10.1103/physrevlett.125.062001

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