/ nucl-ex arXiv:1305.5475


Excitation of the Delta(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8, and 2.3 GeV


Mchedlishvili, D. (Julich, Forschungszentrum) ; Barsov, S. (St. Petersburg, INP) ; Carbonell, J. (Orsay, IPN) ; Chiladze, D. (Julich, Forschungszentrum) ; Dymov, S. (Erlangen - Nuremberg U.) ; Dzyuba, A. (St. Petersburg, INP) ; Engels, R. (Julich, Forschungszentrum) ; Gebel, R. (Julich, Forschungszentrum) ; Glagolev, V. (Dubna, JINR) ; Grigoryev, K. (St. Petersburg, INP) ; Goslawski, P. (Munster U.) ; Hartmann, M. (Julich, Forschungszentrum) ; Imambekov, O. (Dubna, JINR) ; Kacharava, A. (Julich, Forschungszentrum) ; Kamerdzhiev, V. (Julich, Forschungszentrum) ; Keshelashvili, I. (Basel U.) ; Khoukaz, A. (Munster U.) ; Komarov, V. (Dubna, JINR) ; Kulessa, P. (Cracow, INP) ; Kulikov, A. (Dubna, JINR) ; Lehrach, A. (Julich, Forschungszentrum) ; Lomidze, N. (Tbilisi State U.) ; Lorentz, B. (Julich, Forschungszentrum) ; Macharashvili, G. (Dubna, JINR) ; Maier, R. (Julich, Forschungszentrum) ; Merzliakov, S. (Dubna, JINR) ; Mielke, M. (Munster U.) ; Mikirtychyants, M. (St. Petersburg, INP) ; Mikirtychyants, S. (St. Petersburg, INP) ; Nioradze, M. (Tbilisi State U.) ; Ohm, H. (Julich, Forschungszentrum) ; Papenbrock, M. (Munster U.) ; Prasuhn, D. (Julich, Forschungszentrum) ; Rathmann, F. (Julich, Forschungszentrum) ; Serdyuk, V. (Julich, Forschungszentrum) ; Seyfarth, H. (Julich, Forschungszentrum) ; Stein, H.J. (Julich, Forschungszentrum) ; Steffens, E. (Erlangen - Nuremberg U.) ; Stockhorst, H. (Julich, Forschungszentrum) ; Stroher, H. (Julich, Forschungszentrum) ; Tabidze, M. (Tbilisi State U.) ; Trusov, S. (Forschungszentrum Dresden Rossendorf) ; Uzikov, Yu. (Moscow State U.) ; Valdau, Yu. (St. Petersburg, INP) ; Wilkin, C. (University Coll. London)

Pages: 7

Abstract: The charge-exchange break-up of polarised deuterons pol{d}p -> {pp}n, where the final {pp} diproton system has a very low excitation energy and hence is mainly in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange scattering. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.27 GeV have extended these studies into the pion-production regime in order to investigate the mechanism for the excitation of the Delta(1232) isobar in the pol{d}p -> {pp}X reaction. Values of the differential cross section and two deuteron tensor analysing powers, A_{xx} and A_{yy}, have been extracted in terms of the momentum transfer to the diproton or the invariant mass Mx of the unobserved system X. The unpolarised cross section in the high Mx region is well described in a model that includes only direct excitation of the Delta isobar through undistorted one pion exchange. However, the cross section is grossly underestimated for low Mx, even when Delta excitation in the projectile deuteron is included in the calculation. Furthermore, direct Delta production through one pion exchange only reproduces the angular dependence of the difference between the two tensor analysing powers.

Web-Page: http://inspirehep.net/record/1235306/files/arXiv%3A1305.5475.pdf; http://inspirehep.net/record/1235306/files/Fig1a.png; http://inspirehep.net/record/1235306/files/Fig1b.png; http://inspirehep.net/record/1235306/files/Fig2.png; http://inspirehep.net/record/1235306/files/Fig3.png; http://inspirehep.net/record/1235306/files/Fig4.png; http://inspirehep.net/record/1235306/files/Fig5.png; http://inspirehep.net/record/1235306/files/Fig6.png


Note: *Brief entry*; 7 pages with 6 figures

Total numbers of views: 1188
Numbers of unique views: 621
 Record created 2013-07-18, last modified 2014-01-30


External links:
Download fulltextFulltext
Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)