Measurement of the analyzing power in p-->d-->(p p)n with a fast forward 1S0 proton pair.
A measurement of the analyzing power A(y) of the p-->d--> (p p) + n reaction was carried out at the ANKE spectrometer at COSY at beam energies of 0.5 and 0.8 GeV by detection of a fast forward proton pair of small excitation energy E(pp) < 3 MeV. The S-wave dominance in the fast diproton is experimentally demonstrated in this reaction. While at T(p) = 0.8 GeV the measured analyzing power almost vanishes, it rises to nearly unity at T(p) = 0.5 GeV for neutrons emitted at theta(c.m.)(n) = 167 degrees. The results are compared with a model taking into account one-nucleon exchange, single scattering, and Delta(1232) excitation in the intermediate state. The model describes fairly well the unpolarized cross section obtained earlier and the analyzing power at 0.8 GeV; it fails to reproduce A(y) at 0.5 GeV.
Yaschenko
S
S
Physikalisches Institut II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
Dymov
S
S
Kacharava
A
A
Komarov
V
V
Macharashvili
G
G
Rathmann
F
F
Barsov
S
S
Gebel
R
R
Hartmann
M
M
Khoukaz
A
A
Kulessa
P
P
Kulikov
A
A
Kurbatov
V
V
Lang
N
N
Lehmann
I
I
Lorentz
B
B
Mersmann
T
T
Merzliakov
S
S
Mikirtytchiants
S
S
Mussgiller
A
A
Nioradze
M
M
Ohm
H
H
Prasuhn
D
D
Schleichert
R
R
Seyfarth
H
H
Steffens
E
E
Stein
H J
HJ
Ströher
H
H
Uzikov
Yu
Y
Zalikhanov
B
B
Zhuravlev
N
N