Polarization transfer and spin response functions in quasielastic <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mi mathvariant="italic">p</mi><mo>→</mo><mo>,</mo><mi mathvariant="italic">n</mi><mo>→</mo><mo>)</mo></math></span> reactions at 346 MeV

T. Wakasa; H. Sakai; K. Hatanaka; H. Okamura; H. Otsu; S. Fujita; T. Nonaka; T. Uesaka; Y. Satou; T. Ohnishi; G. Yokoyama; S. Ishida; N. Sakamoto; M. B. Greenfield; M. Ichimura; K. Kawahigashi

doi:10.1103/PhysRevC.59.3177

Polarization transfer and spin response functions in quasielastic $(p \to, n \to)$ reactions at 346 MeV

T. Wakasa, H. Sakai, K. Hatanaka, H. Okamura, H. Otsu, S. Fujita, T. Nonaka, T. Uesaka, Y. Satou, T. Ohnishi, G. Yokoyama, S. Ishida, N. Sakamoto, M. B. Greenfield, M. Ichimura, and K. Kawahigashi

Phys. Rev. C 59, 3177 – Published 1 June 1999

Abstract

A complete set of polarization transfer coefficients has been measured for quasielastic $(\vec{p}, \vec{n})$ reactions on $^{2} H,$ $^{6} Li,$ $^{12} C,$ $^{40} Ca,$ and $^{208} Pb$ at a bombarding energy of 346 MeV and a laboratory scattering angle of $22 °$ ${(q}_{lab} \approx 1.7 {fm}^{- 1}) .$ The spin-longitudinal $R_{L}$ and spin-transverse $R_{T}$ response functions are extracted within a framework of a plane-wave impulse approximation with eikonal and optimal factorization approximations. The theoretically expected enhancement of $R_{L} {/ R}_{T}$ is not observed. The observed $R_{L}$ is consistent with the pionic enhanced $R_{L}$ expected by random-phase approximation (RPA) calculations. On the contrary, a large excess of the observed $R_{T}$ is found in comparison with $R_{T}$ of the quasielastic electron scattering as well as of RPA calculations. This excess masks the effect of pionic correlations in $R_{L} {/ R}_{T} .$ The theoretical calculations are performed in a distorted-wave impulse approximation with RPA correlations, which indicates that the nuclear absorption effect depends on the spin direction. This spin-direction dependence is responsible in part for the excess of $R_{T} .$

Received 18 September 1998

DOI:https://doi.org/10.1103/PhysRevC.59.3177

Authors & Affiliations

T. Wakasa^1,*,†, H. Sakai¹, K. Hatanaka², H. Okamura^1,‡, H. Otsu^1,§, S. Fujita^1,∥, T. Nonaka^1,¶, T. Uesaka^1,**, Y. Satou^1,**, T. Ohnishi¹, G. Yokoyama^1,††, S. Ishida^3,‡‡, N. Sakamoto³, M. B. Greenfield⁴, M. Ichimura⁵, and K. Kawahigashi⁶

¹Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
²Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
³The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
⁴Division of Natural Sciences, International Christian University, Mitaka, Tokyo 181-8585, Japan
⁵Institute of Physics, University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan
⁶Department of Information Science, Kanagawa University, Hiratsuka, Kanagawa 259-1293, Japan

^*Electronic address: wakasa@rcnp.osaka-u.ac.jp
^†Present address: Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan.
^‡Present address: Department of Physics, Saitama University, Saitama 338-8570, Japan.
^§Present address: Department of Physics, Tohoku University, Miyagi 980-8578, Japan.
^∥Present address: O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation, Ibaraki 311-1393, Japan.
^¶Present address: Toyota Central Research and Development Laboratories, Inc., Aichi 480-1192, Japan.
^**Present address: The Institute of Physical and Chemical Research, Saitama 351-0198, Japan.
^††Present address: Digital Equipment Corporation Japan, Tokyo 167-0043, Japan.
^‡‡Present address: Soei International Patent Firm, Tokyo 104-0031, Japan.

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Vol. 59, Iss. 6 — June 1999

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