STUDY OF ANGULAR DISTRIBUTION OF HELIUM PROJECTILE FRAGMENTS IN INTERACTIONS OF 200 A GeV 32S IONS WITH EMULSION NUCLEI

M I Adamovich,M M Aggarwal,Yu A Alexandrov,N P Andreeva,Z V Anzon,R Arora,F A Avetyan,S K Badyal,E S Basova,K B Bhalla,A Bhasin,V S Bhatia,V G Bogdanov,V I Bubnov,T H Burnett,Xiao Cai,I Y Chasnikov,L P Chernova,M M Chernyavsky,G Z Eligbaeva,L E Eremenko,A S Gaitinov,E R Ganssauge,S Garpman,S G Gerassimov, J Grote,K G Gulamov,Sandeep K Gupta,Vivek K Gupta,H H Heckman,Huijun Huang,B Jakobsson,B Judek,L Just,S Kachroo,G S Kalyachkina,E K Kanygina,M Karabova,G L Kaul,S Kitroo,S P Kharlamov,S A Krasnov,S I Kulikova,V Kumar,P Lal,V G Larionova,V N Lepetan,L S Liu,S Lokanathan,J J Lord,L S Lukicheva,S B Luo,T N Maksimkina,L K Mangotra,N A Marutyan,N V Maslennikova,I S Mittra,S Mookerjee,H Nasrulaeva,S H Nasyrov,V S Navotny, J Nystrand,G I Orlova,I Otterlund,H S Palsania,N G Peresadko,N V Petrov,V A Plyushchev,D A Qarshiev,W Y Qian,Y M Qin, R Raniwala,S Raniwala,N K Rao,V M Rappoport,J T Rhee,N Saidkhanov,N A Salmanova,L G Sarkisova,V R Sarkisyan,G Shabratova, Ts I Shakhova,S N Shpilev,D Skelding,K Soderstrom,Z I Solovjeva, E Stenlund,E L Surin,L N Svechnikova,K D Tolstov,M Tothova,M I Tretyakova,T P Trofimova,U I Tuleeva,S Vokal,H Q Wang,Z Q Weng,R J Wilkes,Y L Xia,G F Xu,D H Zhang,P Y Zheng,S I Zhokhova,D C Zhou

MODERN PHYSICS LETTERS A（2011）

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摘要

This paper presents data on the emission of helium fragments due to break up of 200 A GeV S-32 ions in collision with emulsion nuclei. A total of 499 minimum bias events have been studied in an emulsion stack and 97 events in emulsion chambers. Emission angles of He fragments have been measured with high precision. This data has been compared with data of breakup of heavier as well as lighter projectiles and we observe that the value of the momentum spread, sigma(p), increases with increasing projectile mass. The bulk part of the helium emission is consistent with a single source for helium fragments with an average excitation energy of (9.1 +/- 0.9) MeV. A tail of a few (< 1%) He fragments with higher momenta is observed.

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