2019 Impact factor 2.176
Hadrons and Nuclei
Eur. Phys. J. A 6, 421-425

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 ($\varphi$) distribution of the fragment momentum projection onto the emulsion plane with respect to initial projectile momentum ${\bf p_{0}}$ is found to be $\sigma_{\varphi}=(0.37\pm 0.02)$ mrad. Corresponding value $\sigma_{0}=(121\pm 6)$ 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, $^{8}Be\rightarrow2\alpha$, is presented for the region of small angles ($\,<\,0.1$mrad). The fraction of $\alpha$-particles coming from the decay of the ground state 8Be is found to be $(13\pm 2)\%$ of their whole number.

PACS
25.10.+s Nuclear reactions involving few-nucleon systems


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