Short range interaction of nucleons inside the nucleus viaHe4(e,e’p)Rreactions

Abstract

Cross sections for the He(e, e'p)R reaction have been measured for recoil momenta between 225 and 500 MeV/c. We find (1) that in the continuum channel a peak in the missing energy spectrum appears which shifts with increasing recoil momentum in a predictable way, and (2) that for the highest recoil momenta (above 300 or 350 MeV/c) overall agreement is obtained with microscopic calculations in which the scattering on nucleon pairs predominates. These results strongly suggest that the highest recoil momenta are generated by the scattering on one of a pair of nucleons. This interpretation is reinforced by an observed continuum momentum distribution which, for high recoil momenta, resembles the momentum distribution of deuterium. We infer that the high momentum part of the momentum distribution of a nucleon pair appears unmodi6ed when embedded in a nuclear medium.PACS number(s): 21.45.+v, 21.30. +y, 25.30. Fj

Relativistic formulation of Glauber theory for A(e,e′p) reactions

“…In Figs. 10 and 11 we display some predictions for the separated 4 He(e, e p) 3 H response functions in kinematics presently accessible at the Thomas Jefferson National Accelerator Facility. As a matter of fact, the kinematics corresponding with Fig.…”

“…In particular, these correlations are at the origin of a long energy and momentum tail in the nuclear spectral function. Direct experimental evidence for these have been found in semi-exclusive A(e, e p) measurements [3,4].…”

He4(e,e'p)Quaglioni1, Efros2, Leidemann3 et al. 2005Phys. Rev. C

“…Equation (19) shows that L [F a,b ] (σ) can be calculated without explicit knowledge of F a,b , provided that one solves the two equations…”

“…A rather large number of basis states is necessary in order to reach convergence, thus leading to large Hamiltonian matrices. Instead of using a time consuming inversion method we directly evaluate the scalar products in (19) with the Lanczos technique as explained in Ref. [38].…”

“…Numerous experimental as well as theoretical investigations of (e, e ′ p) exclusive reactions, in both light and heavy nuclei, have been performed extensively in the past, with the aim to extract information about the structure of these systems [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] . In particular one has tried to access ground state properties of the target nucleus like spectroscopic factors, shell momentum distributions etc.…”