Neutron polarisation transfer, Cx′, in π+ photoproduction off the proton, d(γ⊙,n→π+)nspec

Autor: M. Bashkanov, D.P. Watts, S.J.D. Kay, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, C.S. Akondi, J.R.M. Annand, R. Beck, M. Biroth, N. Borisov, A. Braghieri, W.J. Briscoe, F. Cividini, C. Collicott, S. Costanza, A. Denig, E.J. Downie, P. Drexler, S. Fegan, A. Fix, S. Gardner, D. Ghosal, D.I. Glazier, I. Gorodnov, W. Gradl, D. Gurevich, L. Heijkenskjöld, D. Hornidge, G.M. Huber, V.L. Kashevarov, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, S. Lutterer, I.J.D. MacGregor, D.M. Manley, P.P. Martel, R. Miskimen, E. Mornacchi, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P.B. Otte, D. Paudyal, P. Pedroni, T. Rostomyan, V. Sokhoyan, K. Spieker, O. Steffen, I.I. Strakovsky, T. Strub, I. Supek, A. Thiel, M. Thiel, A. Thomas, Yu.A. Usov, S. Wagner, N.K. Walford, J. Wettig, M. Wolfes, R.L. Workman, N. Zachariou

Publikováno v: Physics Letters B, Vol 847, Iss , Pp 138283- (2023)

We report a first measurement of the double-polarisation observable, Cx′, in π+ photoproduction off the proton. The Cx′ double-polarisation observable represents the transfer of polarisation from a circularly polarised photon beam to the recoili

Externí odkaz: https://doaj.org/article/d00d5ced3dfc466fb69f2a08aa1a37fb

First measurement of polarisation transfer Cx′n in deuteron photodisintegration

Autor: M. Bashkanov, D.P. Watts, S. Kay, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, C.S. Akondi, J.R.M. Annand, H.J. Arends, R. Beck, M. Biroth, N. Borisov, A. Braghieri, W.J. Briscoe, F. Cividini, C. Collicott, S. Costanza, A. Denig, E.J. Downie, P. Drexler, S. Fegan, A. Fix, 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, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, S. Lutterer, I.J.D. MacGregor, D.M. Manley, P.P. Martel, R. Miskimen, E. Mornacchi, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P.B. Otte, D. Paudyal, P. Pedroni, A. Powell, S.N. Prakhov, V. Sokhoyan, K. Spieker, O. Steffen, I.I. Strakovsky, T. Strub, I. Supek, A. Thiel, M. Thiel, A. Thomas, Yu.A. Usov, S. Wagner, J. Wettig, M. Wolfes, N. Zachariou

Publikováno v: Physics Letters B, Vol 844, Iss , Pp 138080- (2023)

A first measurement of the polarisation transfer from a circularly-polarised photon to the final state neutron (Cx′n) in deuterium photodisintegration has been carried out. This quantity is determined over the photon energy range 370 – 700 MeV an

Externí odkaz: https://doaj.org/article/1410c5b2cbb44c73a716e49cd305a03b

Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

Autor: V. Sokhoyan, S. Prakhov, A. Fix, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, P. Aguar-Bartolomé, Z. Ahmed, K. Altangerel, J.R.M. Annand, H.J. Arends, K. Bantawa, M. Bashkanov, R. Beck, M. Biroth, N.S. Borisov, A. Braghieri, W.J. Briscoe, S. Cherepnya, F. Cividini, C. Collicott, S. Costanza, A. Denig, M. Dieterle, E.J. Downie, P. Drexler, M.I. Ferretti Bondy, L.V. Fil'kov, S. Gardner, S. Garni, D.I. Glazier, I. Gorodnov, W. Gradl, M. Günther, G.M. Gurevich, L. Heijkenskjöld, D. Hornidge, G.M. Huber, A. Käser, V.L. Kashevarov, S. Kay, I. Keshelashvili, R. Kondratiev, 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, C. Mullen, A. Mushkarenkov, A. Neganov, A. Neiser, M. Oberle, M. Ostrick, P.B. Otte, D. Paudyal, P. Pedroni, A. Powell, E. Rickert, G. Ron, T. Rostomyan, A. Sarty, C. Sfienti, K. Spieker, O. Steffen, I.I. Strakovsky, B. Strandberg, Th. Strub, I. Supek, A. Thiel, M. Thiel, A. Thomas, M. Unverzagt, Yu.A. Usov, S. Wagner, N.K. Walford, D.P. Watts, D. Werthmüller, J. Wettig, L. Witthauer, M. Wolfes, N. Zachariou

Publikováno v: Physics Letters B, Vol 802, Iss , Pp - (2020)

The beam-helicity asymmetry was measured, for the first time, in photoproduction of π0η pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corr

Externí odkaz: https://doaj.org/article/4672004e30f143adaaf9b16333941918

First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons

Autor: M. Dieterle, L. Witthauer, F. Cividini, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, C.S. Akondi, J.R.M. Annand, H.J. Arends, M. Bashkanov, R. Beck, M. Biroth, N.S. Borisov, A. Braghieri, W.J. Briscoe, S. Costanza, C. Collicott, A. Denig, E.J. Downie, P. Drexler, M.I. Ferretti-Bondy, S. Gardner, S. Garni, D.I. Glazier, D. Glowa, W. Gradl, M. Günther, G.M. Gurevich, D. Hamilton, D. Hornidge, G.M. Huber, A. Käser, V.L. Kashevarov, S. Kay, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, A.B. Lazarev, J.M. Linturi, V. Lisin, K. Livingston, S. Lutterer, I.J.D. MacGregor, J. Mancell, D.M. Manley, P.P. Martel, V. Metag, W. Meyer, R. Miskimen, E. Mornacchi, A. Mushkarenkov, A.B. Neganov, A. Neiser, M. Oberle, M. Ostrick, P.B. Otte, D. Paudyal, P. Pedroni, A. Polonski, S.N. Prakhov, A. Rajabi, G. Reicherz, G. Ron, T. Rostomyan, A. Sarty, C. Sfienti, M.H. Sikora, V. Sokhoyan, K. Spieker, O. Steffen, I.I. Strakovsky, Th. Strub, I. Supek, A. Thiel, M. Thiel, A. Thomas, M. Unverzagt, Yu.A. Usov, S. Wagner, N.K. Walford, D.P. Watts, D. Werthmüller, J. Wettig, M. Wolfes, L. Zana

Publikováno v: Physics Letters B, Vol 770, Iss C, Pp 523-531 (2017)

The double-polarization observable E and the helicity-dependent cross sections σ1/2 and σ3/2 have been measured for the first time for single π0 photoproduction from protons and neutrons bound in the deuteron at the electron accelerator facility M

Externí odkaz: https://doaj.org/article/658711e257454f1784fe885a3f48fb73

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