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Download Growth Points in Nuclear Physics. Nuclear Forces and by P. E. Hodgson PDF

By P. E. Hodgson

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Lett. 1 Nuclear Reaction Times (Nature 245, 240,1973) It is usual to divide nuclear reactions into two stages: the first is the direct interaction of the incident particle with the target nucleus, and this takes place in the time it takes for the particle to cross the nucleus, 22 usually about 1 0 ~ s. After the direct stage, the remaining nucleus is in an excited state in which the energy is shared statistically among all its nucléons. Many interactions can take place among them, and eventually it happens that a nucléon or group of nucléons near the nuclear surface receives enough energy for it to escape, and this continues until the remaining nucleus is left in its ground state.

Wagner, Phys. Rev. C l l , 2 0 6 9 , 1 9 7 5 . P. Grange and M. Martzolff, Lett. Nuovo Cim. 16, 1 5 6 , 1 9 7 6 . P. Grange, M. Martzolff, Y. Nogami, D . W. L. Sprung and C. K. Ross, Phys. Lett. 60B, 237,1976. B. H. J. McKellar and R. Rajaraman, Chapter in Muons in Nuclei, Ed. Sir D e n y s Wilkinson and Dr M. R h o (North-Holland). S-N. Yang, Phys. Rev. CIO, 2 0 6 7 , 1 9 7 4 . 8 Triton Potentials (Nature 260, 749,1976) There have been rather few studies of the interaction of tritons with nuclei, mainly because tritons are highly radio-active, with a half-life of about 12 years.

15. Differential5 8cross-section for the elastic scattering of 139 M e V alpha particles by N i , showing the diffraction region and the semiclassical region. The calculated value of the critical angle is 63°, rather greater than the point where the fall-off becomes exponential. , Optical model; semi-classical (no absorption). 28 Growth Points in Nuclear Physics cross-sections of non-elastic processes, such as inelastic scattering and nucléon transfer reactions. In the case of nucléon scattering this ambiguity is easily resolved, for the real part of the optical potential is essentially that of the shell model of the nucleus, and studies of nuclear bound states require a depth of about 50 MeV.

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