Spin correlation parameter ${C}_{\mathit{yy}}$ of $p+$$^{3}\mathrm{He}$ elastic backward scattering

Spin correlation parameter $C_{yy}$ of $p +$ ${}^{3}{He}$ elastic backward scattering

Y. Shimizu, K. Hatanaka, Y. Tameshige, T. Adachi, K. Fujita, H. Matsubara, H. Okamura, A. Tamii, A. P. Kobushkin, T. Kawabata, Y. Sasamoto, K. Suda, T. Uesaka, K. Itoh, Y. Sakemi, T. Wakui, M. Uchida, T. Kudoh, K. Sagara, T. Wakasa, H. P. Yoshida, Y. Shimbara, E. A. Strokovsky, S. Ishikawa, and M. Tanifuji

Phys. Rev. C 76, 044003 – Published 8 October 2007

Abstract

We measured the differential cross section and the spin correlation parameter $C_{yy}$ of the $\vec{p} + \vec{^{3} He}$ elastic backward scattering at 200, 300, and 400 MeV at $θ = 180^{°}$ in the center-of-mass frame to study the mechanism of the reaction and to examine the validity of the ${}^{3}{He}$ wave functions based on two different realistic two-body forces. This is the first measurement of the spin correlation parameter $C_{yy}$ of the $\vec{p} + \vec{^{3} He}$ EBS at intermediate energies. The experimental results were compared with few-body calculations, including three reaction mechanisms: two-nucleon-pair exchange, pion exchange, and direct $pp$ scattering. It was found that few-body calculations describe the differential cross-section data reasonably well. The spin correlation parameter $C_{yy}$ shows clear evidence for the two-nucleon-pair exchange processes in the reaction, demonstrating that the spin observables are helpful for deeper understanding of the reaction mechanism.

Received 2 May 2007

DOI:https://doi.org/10.1103/PhysRevC.76.044003

Authors & Affiliations

Y. Shimizu^1,*, K. Hatanaka¹, Y. Tameshige¹, T. Adachi¹, K. Fujita¹, H. Matsubara¹, H. Okamura¹, A. Tamii¹, A. P. Kobushkin², T. Kawabata³, Y. Sasamoto³, K. Suda^1,3, T. Uesaka³, K. Itoh⁴, Y. Sakemi⁵, T. Wakui⁵, M. Uchida⁶, T. Kudoh⁷, K. Sagara⁷, T. Wakasa⁷, H. P. Yoshida⁸, Y. Shimbara⁹, E. A. Strokovsky¹⁰, S. Ishikawa¹¹, and M. Tanifuji¹¹

¹Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
²N. N. Bogolyubov Institute for Theoretical Physics, 252143 Kiev, Ukraine
³Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
⁴Department of Physics, Saitama University, Urawa, Saitama 338-8570, Japan
⁵Cyclotron and Radioisotope Center (CYRIC), Tohoku University, Sendai, Miyagi 980-8578, Japan
⁶Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8550, Japan
⁷Department of Physics, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
⁸Research and Development Center for Higher Education, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan
⁹NSCL, Michigan State University, East Lansing, Michigan 48824, USA
¹⁰Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
¹¹Department of Physics, Science Research Center, Hosei University, Fujimi, Tokyo 102-8160, Japan

^*Corresponding author: CNS, University of Tokyo, Wako, Saitama 351-0198, Japan; yshimizu@cns.s.u-tokyo.ac.jp

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Vol. 76, Iss. 4 — October 2007

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Physical Review C

covering nuclear physics

Spin correlation parameter $C_{yy}$ of $p +$ ${}^{3}{He}$ elastic backward scattering

Phys. Rev. C 76, 044003 – Published 8 October 2007

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Spin correlation parameter Cyy of p+He3 elastic backward scattering

Phys. Rev. C 76, 044003 – Published 8 October 2007

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Spin correlation parameter $C_{yy}$ of $p +$ ${}^{3}{He}$ elastic backward scattering