Subthreshold $K^+$ production in proton-nucleus collisions
M. Debowski
(1)
,
R. Barth
(1)
,
M. Boivin
,
Y. Le Bornec
(2)
,
M. Cieslak
,
M.P. Comets
(2)
,
P. Courtat
(2)
,
R. Gacougnolle
(2)
,
E. Grosse
(1)
,
T. Kirchner
(2)
,
J.M. Martin
(2)
,
D. Miskowiec
(1)
,
C. Muentz
,
E. Schwab
(1)
,
P. Senger
(1)
,
C. Sturm
,
B. Tatischeff
(2)
,
A. Wagner
,
W. Walus
,
N. Willis
(2)
,
R. Wurzinger
,
J. Yonnet
,
A. Zghiche
M. Boivin
- Function : Author
M. Cieslak
- Function : Author
C. Muentz
- Function : Author
C. Sturm
- Function : Author
A. Wagner
- Function : Author
W. Walus
- Function : Author
R. Wurzinger
- Function : Author
J. Yonnet
- Function : Author
A. Zghiche
- Function : Author
Abstract
Double differential K$^+$ cross sections have been measured in p+C collisions at 1.2, 1.5 and 2.5 GeV beam energy and in p+Pb collisions at 1.2 and 1.5 GeV. The K$^+$ spectrum taken at 2.5 GeV can be reproduced quantitatively by a model calculation which takes into account first chance proton-nucleon collisions and internal momentum with energy distribution of nucleons according to the spectral function. At 1.2 and 1.5 GeV beam energy the K$^+$ data excess significantly the model predictions for first chance collisions. When taking secondary processes into account the results of the calculations are in much better agreement with the data.