Nuclear Reactions at High Energy

Abstract

In the quark model, nuclei (B 5 2) have exotic quantum numbers. Given a nuclear reaction in which certain quantum numbers a r e exchanged, what i s the scattering amplitude at high energies, in the GeV region? Does it have Regge behavior? I s i t dual? Are there multibaryon resonances? In this context we present a general survey of all high-energy nuclear reactions -mainly those involving light nuclei. For B = 0 exchange reactions, like adad and a-ha 9 (h I 3~e , t = 3~) , there i s the impulse and rescattering (Glauber) model. For

3Hestructure and mechanisms ofp3Hebackward el

“…Such mechanisms were discussed in Refs. [3,9] on the basis of the triangle diagram of the one pion exchange (OPE) with the subprocess pd → 3 He π 0 (Fig. 1b) and in Ref.…”

“…[10,11]. However, a common drawback of the models [9,10,11] is the neglect of both (i) the contribution of the singlet deuteron d * (i.e. where the pn pair is in the spin-singlet ( 1 S 0 ) state) in 3 He and (ii) distortions coming from rescattering in the initial and final states.…”

ReactionsHe3(π−, n)Källne1, Thiessen2, Morris3 et al. 1978Phys. Rev. Lett.31000View full textAdd to dashboardCite

“…Since this dip is found at fixed angle rather than fixed momentum transfer it is not likely to be a signature of a nuclear structure. It is interesting to note that it occurs at an angle close to the energy-independent minimum at 6 <*> 70°-80° found in pion elastic scattering for 3 He and 4 He. The latter is not con- sidered a diffraction minimum but an effect of the predominance of the (3,3) resonance in the pion scattering off nucleons.…”

“…The angular distributions for the reaction 3 He(7r",w) 2 H atT\ = 100, 200, and 290 MeV are shown in Fig. 1.…”

“…For the u +A interaction part of the (v,N) reaction, one would also like to see detailed distortedwave calculations performed with optical potentials determined from elementary v +N interactions. Such potentials have been successfully 11 * 12 applied to pion elastic scattering for 2 H, 3 He, and 4 He; when applied to the (77, N) reaction this could test, for instance, the off-shell treatment of the IT +N interaction and the different prescriptions for the TTNN absorption vertex.…”