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He3andHe4production by 800 MeV protons fromC12, Ti, and Pb at forward angles

Physical Review C1992Vol. 45(1), pp. 293–298

Citations Over TimeTop 23% of 1992 papers

D. Barlow, B.M.K. Nefkens, C. Pillai, J. W. Price, I. Šlaus, M. J. Wang, J. A. Wightman, K. W. Jones, M. J. Leitch, C. S. Mishra, C. L. Morris, J.-C. Peng, P. K. Teng, J. M. Tinsley

Abstract

The doubly differential cross section for the production of $^{3}\mathrm{He}$ and $^{4}\mathrm{He}$ by 800 MeV protons from $^{12}\mathrm{C}$, Ti, and Pb has been measured at laboratory angles of 6\ifmmode^\circ\else\textdegree\fi{} and 15\ifmmode^\circ\else\textdegree\fi{}. The momentum of the detected helium nuclei varied from 1 to 2 GeV/c, the maximum being well above the incident proton momentum of 1.46 GeV/c. The cross sections were found to increase with increasing target mass and decrease with increasing momentum and scattering angle. In our momentum region, the $^{3}\mathrm{He}$ production cross section is 1.5--10 times larger than $^{4}\mathrm{He}$ depending on the target and the momentum. The data are consistent with the hypothesis that the dominant reaction mechanism is a direct process where the initial nucleon-nucleon scattering is followed by a sequential pickup of neutrons.

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