NUCPI - Jefferson Lab Experiment E91-003
Pion electroproduction from light nuclei: The search for
nuclear pions.
Experiment Overview
- Spokesperson: Harold Jackson, Argonne National Lab
- 67 Collaborators from 17 institutions in the the United States,
Japan, The Netherlands, and Armenia
- Two thesis students: David Gaskell (Oregon State University, 2001)
and Steven Avery (Hampton University, 2002)
- Data taken in winter 1998, in
Hall C of Jefferson Lab
- Separated longitudinal and transverse cross sections for charged pion electroproduction from 1H, 2H,
and 3He were measured at Q2=0.4 (GeV/c)^2 for two values of the invariant mass, W=1.15 GeV and W=1.60
GeV, in a search for a mass dependence which would signal the effect of nuclear pions. The longitudinal cross
section, if dominated by the pion-pole process, should be sensitive to nuclear pion currents. Comparisons of
the longitudinal cross section target ratios to a quasifree calculation reveal a significant suppression in
3He at W=1.60 GeV. The W=1.15 GeV results are consistent with simple estimates of the effect of nuclear
pion currents, but are also consistent with pure quasifree production.
Contents
This page is maintained by David Potterveld (potterveld 'at' anl.gov)
It was last updated May 18, 2001