Angular distributions of light projectile fragments in deep inelastic Pb + Em interactions at 160 A GeV
EMU-01 Collaboration
M.I. Adamovich12 - M.M. Agarwall13 - Y.A. Alexandrov13 - N.P. Andreeva1 -
S.K. Badyal7 - E.E. Basova14 - K.B. Bhalla6 - A. Bhasin7 - V.S. Bhatia3 -
V. Bradnova5 - V.I. Bubnov1 - X. Cai16 - I.Y. Chasnikov1 - G.M. Chen2 -
L.P. Chernova15 - M.M. Chernyavsky12 - S. Dhamija3 - K.El Chenawi10 -
D. Felea3 - S.Q. Feng16 - A.S. Gaitinov1 - E.R. Ganssauge11 -
S.Garpman10 - S.G. Gerasimov12 - A. Gheata3 - M. Gheata3 - J. Grote13 -
K.G. Gulamov15 - S.K. Gupta6 - V.K. Gupta7 - U. Henjes11 -
B. Jakobsson10 - E.K. Kanygina1 - M. Karabova8 - S.P.Kharlamov12 -
A.D. Kovalenko5 - S.A. Krasnov5 - V.Kumar6 - V.G. Larionova12 -
F.G. Lepekhin17 - O.V. Levitskaya17 - Y.X. Li4 - L.S. Liu16 -
S. Lokanathan6 - J.J. Lord13 - N.S. Lukicheva15 - Y. Lu2 - S.B. Luo9 -
L.K. Mangotra7 - I. Manhas7 - I.S. Mittra3 - A.K. Musaeva1 -
S.Z. Nasyrov14 - V.S. Navotny15 - J. Nystrand10 - I. Otterlund10 -
N.G. Peresadko12 - W.Y. Qian16 - Y.M. Qin9 - R. Raniwala6 - N.K. Rao7 -
M.Roeper11 - V.V. Rusakova5 - N. Saidkhanov15 - N.A. Salmanova12 -
A.M. Seitimbetov1 - D.M. Seliverstov17 - B.B. Simonov17 - R. Sethi3 -
B. Singh6 - D. Skelding13 - K. Soderstrem10 - E. Stenlund10 -
L.N. Svechnikova15 - T. Svensson10 - A.M. Tawfik11 - M. Tothova8 -
M.I. Tretyakova12 - T.P.Trofimova14 - U.I. Tuleeva14 - Vani Vashisht3 -
S. Vokal8 - J. Vrlakova8 - H.Q. Wang2 - X.R. Wang16 - Z.Q. Weng4 -
R.J. Wilkes13 - C.B. Yang16 - Z.B. Yin16 - L.Z. Yu16 - D.H. Zhang9 -
P.Y. Zheng2 - S.I. Zhokhova15 - D.C. Zhou16
1 High Energy Physics Institute, Almaty, Kazakstan
2 Institute of High Energy Physics, Academia Sinica, Beijing, P.R. China
3 Department of Physics, Panjab University, Chandrigarh, India
4 Department of Physics, Hunan Education Institute, Changsha, Hunan, P.R. China
5 Joint Institute for Nuclear Research (JINR), Dubna, Russia
6 Department of Physics, University of Rajastan, Jaipur, India
7 Department of Physics, University of Jammu, Jammu, India
8 Department of Nuclear Physics and Biophysics, Safarik University, Kosice, Slovacia
9 Department of Physics, Shanxi Normal University, Linfen, Shanxi, P.R. China
10 Department of Physics, University of Lund, Lund, Sweden
11 F.B.Physik, Philipps University, Marburg, Germany
12 P.N.Lebedev Institute of Physics, Moscow, Russia
13 Department of Physics, University of Wasington, Seattle, Washington, USA
14 Institute of Nuclear Physics, Tashkent, Usbekistan
15 Physical-Technical Institute, Tashkent, Usbekistan
16 Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, Hubei, P.R. China
17 St.Peterburg Nuclear Physics Institute, St.Peterburg, Russia
Received: 15 June 1999 / Revised version: 20 August 1999 Communicated by V.V. Anisovich
Abstract
The nuclear emulsion was exposed at CERN by the lead projectile at 160 A GeV. The angles
between any pair of fragments with Z=2-4 have been measured in the emulsion plane for the events which
did not contain heavy fragments. The constant characterizing the normal angle ()
distribution
of the fragment momentum projection onto the emulsion plane with respect to initial projectile momentum
is found to be
mrad. Corresponding value
MeV/c of nucleon momentum distribution in the lead nucleus coincides with that
expected from Fermi momentum distribution for this nucleus. The peak in the pair-angle distribution of
double-charged fragments,
,
is presented for the region of small angles (
mrad). The fraction of
-particles coming from the decay of the ground state 8Be is found to
be
of their whole number.
PACS
25.10.+s Nuclear reactions involving few-nucleon systems
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