April 4, 2017

Download Advances in Nuclear Physics: Volume 4 by Daphne F. Jackson (auth.), Michel Baranger, Erich Vogt PDF

By Daphne F. Jackson (auth.), Michel Baranger, Erich Vogt (eds.)

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Comparison of Knockout and Absorption Processes In this section we consider those direct reactions which lead to the ejection of a group of two or more nucleons from the nucleus. We exclude 38 Daphne F. Jackson from the discussion processes such as evaporation and spallation, and also knockout reactions such as (p, 3p) in which there are more than two fast particles in the final state. The remaining processes are of three types: (i) Quasi-elastic knockout reactions, such as (p, pd), (p, pa), and (a,2a).

The experimental spectroscopic factors are in most cases in satisfactory agreement with those predicted from the work of Cohen and Kurath although there are rather large uncertainties in some cases (JJ 67). These results suggest (Jac 68) that the observed states do not exhaust the sum rule and that there must be additional Is and Ip hole strength which has not so far been detected. This means that estimates of the mean separation energies may be in doubt and the assumption that the position of the peak in a poor resolution experiment yields a reliable value for the mean separation energy (ES 67, Elt 68a) can not at present be verified.

The results are generally in good agreement for protons in the outer shells of Ip- and 2sld-shell nuclei, and for protons in the 2sldshell in 2plf-shell nuclei. There is a rather marked discrepancy between the results obtained for the lp nucleons in 2sld-shell nuclei from the (p,2p) t This conclusion is based on the assumption, possibly doubtful, that the data (Tyr+ 66) do not contain any contribution from the 2si knockout. 1. The Investigation of Hole States in Nuclei 35 reaction and the (d, 3He) reaction, which appears to arise from the splitting of the Ip hole strength over a wide range of excitation energy so that the Ip and 2sIdhoie states overlap to such an extent that they cannot be resolved in the (P,2p) experiment (Ard+ 69, Wag 69).

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