The energy transfer dependence of the quasielastic [sup 12]C(e,e[prime]p) reaction at high-momentum transfer

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6962044

Morrison, J H

This thesis describes the measurement of coincidence electron scattering from [sup 12]C at a momentum transfer of approximately 1000 MeV/c at quasielastic kinematics and below quasielastic kinematics. The author detected the scattered electron and a knocked-out proton in coincidence. The author also measured the coincidence cross section as a function of missing energy E[sub m], at two values of the momentum transfer q and energy transfer w: below quasielastic kinematics at q = 970 MeV/c and w = 330 MeV, and at quasielastic kinematics at q = 990 MeV/c and w = 475 MeV. Missing energy spectra for each of the measurements was produced. The dependence of the cross sections on w around the central values is indicated by expanding the cross sections in orthogonal polynomials in w and displaying the lowest few terms. Radiative corrections are applied to the spectra. The author identifies two peaks in the missing energy spectra corresponding to single-particle proton knockout from the p-shell and the s-shell. At quasielastic kinematics, two continuum regions in missing energy is identified: the near continuum where the cross section decreases with E[sub m] and increases with w, and the far continuum where the cross section is constant in E[sub m] and w. In contrast to quasielastic kinematics, the near continuum cross section is strongly suppressed below quasielastic kinematics, and the far continuum cross section is zero. The author compared the p-shell and s-shell single-particle knockout cross section measured from the data with Distorted Wave Impulse Approximation calculations. Single-particle knockout accounted for most of the cross section below quasielastic kinematics, but only for half the cross section at quasielastic kinematics. Also compared was the quasielastic continuum cross section with calculations of Multinucleon knockout and pion production. Pion production probably accounts for no more than half the cross section beyond pion threshold in missing energy.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• OSTI ID: 6962044
• Country of Publication: United States
• Language: English

Related Subjects

663420* -- Lepton-Induced Reactions & Scattering-- (1992-)
663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
DIRECT REACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
ENERGY SPECTRA
ENERGY TRANSFER
FERMIONS
HEAVY ION REACTIONS
LEPTONS
MOMENTUM TRANSFER
NUCLEAR REACTIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SPECTRA