Physics is fun, by Jardine J.

By Jardine J.

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Including both the one-step and two-step cross contributions, the di erential cross-sections for three outgoing energies are ÿtted well, and the calculated analysing powers are similar to the measured values. The main di culty is the sensitivity of the analysing powers to the optical potentials, which are not well known. E. Hodgson, E. BÄetÃak / Physics Reports 374 (2003) 1 – 89 Fig. 10. Experimental double-di erential cross-sections as a function of scattering angle  for 59 Co(˜p; 3 He) at 100 MeV incident energy and various outgoing energies E (statistical uncertainties are smaller than the symbol size) compared with calculations for one step (− − −), two step (· · · · ·), and three step (− · · − · · −) contributions.

1990) and Nakagawa et al. (1995). The preformation factor d = 0:40. Comparing it with some theoretical estimations of Sato et al. (1983) this value is a reasonable one. For the nucleon Fermi energy F = 38 MeV which corresponds in the local density approximation to the equilibrium density in the central part of the nucleus. By investigating the L-dependence of the transmission coe cients, it was found that it is su cient to include coe cients up to Lmax = 18 in (46) for the energies considered in this work.

1963). 3. The (p, 3 He) and (n, t) reactions and inverses These reactions, together with the (d; ) and ( ; d) reactions and the (6 Li; ) and ( ; 6 Li) reactions can be treated as the pickup or transfer of a deuteron cluster or, more precisely, as a correlated neutron–proton pair. e. a deuteron), whereas (p; 3 He) reactions can remove either a T = 0, S = 1 pair or a T = 1, S = 0 pair. The two-nucleon cluster transfer model is however a poor approximation for calculations of the absolute magnitude, although angular distributions are often given quite well.

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