By Daphne F. Jackson (auth.), Michel Baranger, Erich Vogt (eds.)
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Additional info for Advances in Nuclear Physics: Volume 4
Preliminary results from measurements of energy spectra and angular distributions for the (p, 2p) reaction at 600 MeV carried out by the Caen-CERN-Uppsala collaboration confirm the results obtained at 387 MeV for light and medium-mass nuclei. A very large number of events has been obtained and the error on the location of the peak position is of the order of 1 MeV. The saturation of the separation energy for Is and Ip states, as observed in the (P,2p) experiment, is in accord with the trend observed for the Id and 2s states (Ruh + 67) and removes the need to invoke rearrangement (Wag 69) or some other process to explain the discrepancy between the behavior of the 2s and Id states and the nonsaturating behavior of the Ip states as observed in the (e, ep) experiment.
T When these high momenta are less important, for example in photodisintegration at low energies, the quasi-deuteron model seems to break down (Fuj 62). The cross section for a knockout reaction can be derived using the same basic assumption. , -Q is the momentum of the center of mass of the pair of nucleons or deuteron cluster before collision), and the momentum transfer is (48) q=PO-PI The cross section for the (P,pd) reaction is then given by (JE 65, Jac 65a) d 3a _ dQ dQ dE - K I 2 I G(Q) I2 ( da ) dQ pd (49) where K is a kinematic factor and (da/dQ)pd is the cross section for free proton-deuteron scattering evaluated at a scattering angle in the protondeuteron center-of-mass system of As in the case of the (p, 2p) reaction, the relative momentum before collision is not the same as the relative momentum after collision.
However, the energy-momentum conditions in the two reactions are quite different, and this has an important influence on the range of proton or neutron momentum components which are examined and on the effect of distortion and finite-range corrections on the angular distributions. 23 is the Q-value (in MeV) for the reaction, SnA is 24 Daphne F. Jackson the separation energy of the neutron in the target nucleus, and Eo is the incident proton energy. , the same reaction at different energies is sensitive to different momentum components of the single-particle overlap integral.