NN($^1S_0$) pairs in $^3$He and in p$^3$He backward elastic scattering

Details NN($^1S_0$) pairs in $^3$He and in p$^3$He backward elastic scattering NN($^1S_0$) pairs in $^3$He and in p$^3$He backward elastic scattering

2003-08-22

arxiv.org/abs/nucl-th/0308063v1

Physics

Nuclear Physics

Nuclear Theory

3 pages, Latex, 1 postscript figure. Contribution to the 17th International IUPAP Conference on Few-body Problems in Physics,

Scientific paper

It is shown that the shoulder observed in the cross section of $p^3He$ backward elastic scattering at proton beam energies of 0.4 -- 0.7 GeV can be explained by the mechanism of virtual $\pi$-meson production with a dominant contribution from the subprocesses $pd^*\to ^3$He$ \pi^0$ and $p(pp)\to^3$He$ \pi^+$, where $d^*$ denotes the singlet deuteron and the $pp$ pair is in the $^1S_0$ state. At high energies, 1-3 GeV, the mechanism of $np$-pair transfer dominates and probes high-momentum $NN(^1S_0$) correlations in $^3$He.

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