n-p short-range correlations from (p,2p+n) measurements.
We studied the 12C(p,2p+n) reaction at beam momenta of 5.9, 8.0, and 9.0 GeV/c. For quasielastic (p,2p) events p(f), the momentum of the knocked-out proton before the reaction, was compared (event by event) with p(n), the coincident neutron momentum. For |p(n)|>k(F)=0.220 GeV/c (the Fermi momentum) a strong back-to-back directional correlation between p(f) and p(n) was observed, indicative of short-range n-p correlations. From p(n) and p(f) we constructed the distributions of c.m. and relative motion in the longitudinal direction for correlated pairs. We also determined that 49+/-13% of events with |p(f)|>k(F) had directionally correlated neutrons with |p(n)|>k(F).
Tang
A
A
Department of Physics, Kent State University, Kent, Ohio 44242, USA.
Watson
J W
JW
Aclander
J
J
Alster
J
J
Asryan
G
G
Averichev
Y
Y
Barton
D
D
Baturin
V
V
Bukhtoyarova
N
N
Carroll
A
A
Gushue
S
S
Heppelmann
S
S
Leksanov
A
A
Makdisi
Y
Y
Malki
A
A
Minina
E
E
Navon
I
I
Nicholson
H
H
Ogawa
A
A
Panebratsev
Yu
Y
Piasetzky
E
E
Schetkovsky
A
A
Shimanskiy
S
S
Zhalov
D
D