This article is cited in 2 papers

FIELDS, PARTICLES, AND NUCLEI

Measurement of the azimuthal anisotropy coefficient v₂ for the emission of α particles in nucleus-nucleus collisions at energies 1.88–10.6 GeV/nucleon

V. V. Dubinina, N. P. Egorenkova, V. I. Krotkova, E. A. Pozharova, V. A. Smirnitsky

Institute for Theoretical and Experimental Physics (Russian Federation State Scientific Center)

Abstract: The azimuthal anisotropy of the emission of α particles in collisions of the ²²Ne, ²⁴Mg, ⁵⁶Fe, and ¹⁹⁷Au nuclei with photoemulsion nuclei has been measured at projectile energies E _pr = 1.88–10.6 GeV/nucleon. The results are compared with similar measurements for protons. It has been found that the ratio of the azimuthal anisotropy coefficients v ₂ for α particles and protons is equal to 6 ± 2 at low energies E _pr ≈ 2 GeV/nucleon, whereas these coefficients coincide with each other for energies E _pr ≥ 4 GeV/nucleon. This difference may indicate that, at low projectile energies, α particles are formed predominantly at the early stage of a collective flow. Formation of α particles for E _pr ≥ 4 GeV/nucleon likely occurs at the stage of nuclear matter scattering.

PACS: 25.55.-e

Received: 09.03.2005
Revised: 01.06.2005

 English version: Journal of Experimental and Theoretical Physics Letters, 2005, 82:1, 14–16

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