$^3$He Structure and Mechanisms of $p^3$He Backward Elastic Scattering

Details $^3$He Structure and Mechanisms of $p^3$He Backward Elastic Scattering $^3$He Structure and Mechanisms of $p^3$He Backward Elastic Scattering

2002-12-21

arxiv.org/abs/nucl-th/0212092v2

Phys.Rev. C68 (2003) 014001

Physics

Nuclear Physics

Nuclear Theory

17 pages, Latex, 4 postscript figures, expanded version, accepted by Physical Review C

Scientific paper

10.1103/PhysRevC.68.014001

The mechanism of $p^3$He backward elastic scattering is studied. It is found that the triangle diagrams with the subprocesses $pd\to ^3$He$ \pi^0$, $pd^*\to ^3$He$ \pi^0$ and $p(pp)\to^3$He$ \pi^+$, where $d^*$ and $pp$ denote the singlet deuteron and diproton pair in the $^1S_0$ state, respectively, dominate in the cross section at 0.3-0.8 GeV, and their contribution is comparable with that for a sequential transfer of a $np$ pair at 1-1.5 GeV. The contribution of the $d^*+pp$, estimated on the basis of the spectator mechanism of the $p(NN)\to ^3$He$ \pi$ reaction, increases the $p^3$He$\to ^3$He$ p$ cross section by one order of magnitude as compared to the contribution of the deuteron alone. Effects of the initial and final states interaction are taken into account.

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