TY - JOUR
T1 - Wolfenstein parameters for s1/2 proton knockout (p,2p) reactions
AU - Noro, T.
AU - Kawabata, M.
AU - Hillhouse, G. C.
AU - Akimune, S.
AU - Akiyoshi, H.
AU - Daito, I.
AU - Hatanaka, K.
AU - Itoh, M.
AU - Maeda, Y.
AU - Matsuoka, N.
AU - Morinobu, S.
AU - Nakamura, M.
AU - Okihana, A.
AU - Sagara, H.
AU - Sakaguchi, H.
AU - Takahisa, K.
AU - Takeda, H.
AU - Tamii, A.
AU - Tamura, K.
AU - Toyokawa, H.
AU - Yamazaki, H.
AU - Yoshida, H. P.
AU - Yosoi, M.
N1 - Funding Information:
K. H. and P. L. are grateful for support under NASA grant NAG5–2704. This research has made use of data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA-Goddard Space Flight Center. H. P. is grateful for hospitality at NBIfAFG, Copenhagen. This research has made use of data obtained at the European Southern Observatory. T. M. is grateful for support under Japan Ministry of Education, Culture, and Sports grant 05242104.
Funding Information:
1The Very Large Array of the National Radio Astronomy Observatory is operated by Associated Universities, Inc., under a cooperative agreement with the National Science Foundation.
PY - 2008/4/23
Y1 - 2008/4/23
N2 - A complete set of Wolfenstein parameters (Di'j), induced polarizations (P), and analyzing powers (Ay) have been measured for (p,2p) reactions on Li6, C12, and Ca40 targets in order to investigate possible nuclear medium effects on the nucleon-nucleon (NN) interaction. Most of these observables show significant reductions from the values for proton-proton scattering as monotonic functions of the nuclear density relevant to these reactions. The reductions of these Di'j are reasonably reproduced by nonrelativistic plane-wave and distorted-wave calculations based on the impulse approximation, demonstrating that these suppressions are attributed to changes of the two body kinematics due to the finite separation energies of these reactions, while the reductions of Ay and P are much more prominent than the calculations. The relativistic calculations, which partly explain the Ay and P reductions, cannot reproduce the Di'j data, but all the data are consistently reproduced when the parameters of the NN interaction in a meson exchange model are renormalized, suggesting possible modifications of the NN interaction by the surrounding nuclear medium.
AB - A complete set of Wolfenstein parameters (Di'j), induced polarizations (P), and analyzing powers (Ay) have been measured for (p,2p) reactions on Li6, C12, and Ca40 targets in order to investigate possible nuclear medium effects on the nucleon-nucleon (NN) interaction. Most of these observables show significant reductions from the values for proton-proton scattering as monotonic functions of the nuclear density relevant to these reactions. The reductions of these Di'j are reasonably reproduced by nonrelativistic plane-wave and distorted-wave calculations based on the impulse approximation, demonstrating that these suppressions are attributed to changes of the two body kinematics due to the finite separation energies of these reactions, while the reductions of Ay and P are much more prominent than the calculations. The relativistic calculations, which partly explain the Ay and P reductions, cannot reproduce the Di'j data, but all the data are consistently reproduced when the parameters of the NN interaction in a meson exchange model are renormalized, suggesting possible modifications of the NN interaction by the surrounding nuclear medium.
UR - https://www.scopus.com/pages/publications/43049102021
UR - https://www.scopus.com/pages/publications/43049102021#tab=citedBy
U2 - 10.1103/PhysRevC.77.044604
DO - 10.1103/PhysRevC.77.044604
M3 - Article
AN - SCOPUS:43049102021
SN - 0556-2813
VL - 77
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 4
M1 - 044604
ER -