Strong enhancement of extremely energetic proton production in central heavy ion collisions at intermediate energy.
The energetic proton emission has been investigated as a function of the reaction centrality for the system (58)Ni + (58)Ni at 30A MeV. Extremely energetic protons (E(NN)(p) > or = 130 MeV) were measured and their multiplicity is found to increase almost quadratically with the number of participant nucleons, thus indicating the onset of a mechanism beyond one- and two-body dynamics.
Sapienza
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INFN--Laboratorio Nazionale del Sud, Via S. Sofia 44, I -95123 Catania, Italy.
Coniglione
R
R
Colonna
M
M
Migneco
E
E
Agodi
C
C
Alba
R
R
Bellia
G
G
Del Zoppo
A
A
Finocchiaro
P
P
Greco
V
V
Loukachine
K
K
Maiolino
C
C
Piattelli
P
P
Santonocito
D
D
Ventura
P G
PG
Blumenfeld
Y
Y
Bruno
M
M
Colonna
N
N
D'Agostino
M
M
Fabbietti
L
L
Fiandri
M L
ML
Gramegna
F
F
Iori
I
I
Margagliotti
G V
GV
Mastinu
P F
PF
Milazzo
P M
PM
Moroni
A
A
Rui
R
R
Scarpaci
J A
JA
Vannini
G
G