Angular distributions of light projectile fragments in deep inelastic Pb+Em interactions at 160 A GeV

Citation
Mi. Adamovich et al., Angular distributions of light projectile fragments in deep inelastic Pb+Em interactions at 160 A GeV, EUR PHY J A, 6(4), 1999, pp. 421-425
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL A
ISSN journal
1434-6001 → ACNP
Volume
6
Issue
4
Year of publication
1999
Pages
421 - 425
Database
ISI
SICI code
1434-6001(199912)6:4<421:ADOLPF>2.0.ZU;2-H
Abstract
The nuclear emulsion was exposed at CERN by the lead projectile at 160 A Ge V. The angles between any pair of fragments with Z = 2 - 4 have been measur ed in the emulsion plane for the events which did not contain heavy fragmen ts. The constant characterizing the normal angle (cp) distribution of the f ragment momentum projection onto the emulsion plane with respect to initial projectile momentum Po is found to be sigma(phi) = (0.37 +/- 0.02) mrad. C orresponding value sigma(o) = (121 +/- 6) MeV/c of nucleon momentum distrib ution in the lead nucleus coincides with that expected from Fermi momentum distribution for this nucleus. The peak in the pair-angle distribution of d ouble-charged fragments, Be-8 --> 2 alpha, is presented for the region of s mall angles (< 0.1 mrad). The fraction of alpha-particles coming from the d ecay of the ground state Be-8 is found to be (13 +/- 2)% of their whole num ber.