Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-10-03
Nucl.Phys. A596 (1996) 488-502
Physics
Nuclear Physics
Nuclear Theory
19 pages, latex including two figures. Two further Postscript figures are available on request to cw@hep.ucl.ac.uk
Scientific paper
10.1016/0375-9474(95)00422-X
The cross section for the reaction $dd\rightarrow \,^4\!H\!e\,\eta$ close to threshold is estimated in a two-step model, similar to that which successfully describes near-threshold $pd\rightarrow \,^3\!H\!e\,\eta$ production. A $\pi$-meson, created in a $dp\rightarrow \,^3\!H\!e\,\pi^o$ process on one nucleon in the target deuteron, is converted into an $\eta$-meson by a secondary $\pi^o n \to n\,\eta$ reaction on the other nucleon. The kinematics are such that both processes are nearly physical so that only small Fermi momenta are required. The predictions of the model are in good agreement with recent Saclay experimental data. An analogous model, when applied to the near-threshold $n\,^3\!H\!e\rightarrow \,^4\!H\!e\,\eta$ reaction, predicts a cross section of a rather similar size, but experimental difficulties render this a doubtful means of studying the $\eta\, ^4\!H\!e$ interaction.
Faeldt Goeran
Wilkin Colin
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