Quasi-elastic polarization-transfer measurements on the deuteron in anti-parallel kinematics (CROSBI ID 289329)
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Podaci o odgovornosti
Paul, S. ; Izraeli, D. ; Brecelj, T. ; Yaron, I ; Achenbach, P. ; Arenhoevel, H. ; Ashkenazi, A. ; Beričić, J. ; Boehm, R. ; Bosnar, D. ; Cline, E. ; Cohen, E. O. ; Debenjak, L. ; Distler, M. O. ; Esser, A. ; Friščić, I ; Gilman, R. ; Heilig, M. ; Kegel, S. ; Klag, P. ; Kohl, Y. ; Kolar, T. ; Korover, I ; Lichtenstadt, J. ; Mardor, I ; Merkel, H. ; Middleton, D. G. ; Mihovilovič, M. ; Mueller, J. ; Mueller, U. ; Olivenboim, M. ; Piasetzky, E. ; Pochodzalla, J. ; Ron, G. ; Schlimme, B. S. ; Schoth, M. ; Schulz, F. ; Sfienti, C. ; Širca, S. ; Štajner, S. ; Strauch, S. ; Thiel, M. ; Tyukin, A. ; Weber, A.
A1 Collaboration
engleski
Quasi-elastic polarization-transfer measurements on the deuteron in anti-parallel kinematics
We present measurements of the polarization- transfer components in the 2H(e, e′p)reaction, covering a previously unexplored kinematic region with large positive(anti-parallel) missing momentum, pmiss, up to 220 MeV/ c, and Q2=0.65(GeV/ c)2. These measurements, performed at the Mainz Microtron (MAMI), were motivated by theoretical calculations which predict small final-state interaction (FSI) effects in these kinematics, making them favorable for searching for medium modifications of bound nucleons in nuclei. We find in this kinematic region that the measured polarization-transfer components Pxand Pzand their ratio agree with the theoretical calculations, which use free-proton form factors. Using this, we establish upper limits on possible medium effects that modify the bound proton’s form factor ratio GE/GMat the level of a few percent. We also compare the measured polarization-transfer components and their ratio for 2H to those of a free (moving) proton. We find that the universal behavior of 2H, 4He and 12C in the double ratio (Px/Pz)A(Px/Pz)1His maintained in the positive missing-momentum region.
polarization-transfer ; deuteron ; anti-parallel kinematics
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