Cumulative production of nucleons and extremely light nuclei in 4 He p interactions at an incident momentum of 5 GeV/ c
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CLEI Experiment
Cumulative Production of Nucleons and Extremely Light Nuclei in 4 Hepp Interactions at an Incident Momentum of 5 GeV/c A. V. Blinov* and M. V. Chadeyeva** Institute of Theoretical and Experimental Physics, Bol’shaya Cheremushkinskaya ul. 25, Moscow, 117218 Russia Received November 11, 2005; in final form, February 27, 2006
Abstract—The invariant cross sections for the cumulative production of protons, neutrons, and extremely light nuclei (d, 3 H, and 3 He) are determined on the basis of experimental data obtained by exposing the 2-m liquid-hydrogen bubble chamber of the Institute of Theoretical and Experimental Physics (ITEP, Moscow) to a 5-GeV/c α-particle beam, the kinetic energy of primary protons in the rest frame of the nucleus involved being Tp = 620 MeV. The results obtained in this way are compared with the predictions of the Frankfurt–Strikman model, which takes into account short-range few-nucleon correlations, and with the predictions of the nuclear coalescence model. PACS numbers : 25.55.-e DOI: 10.1134/S1063778806090018
1. INTRODUCTION Investigation of processes involving the production of hadrons and extremely light fragments outgoing at large angles in hadron–nucleus interactions and in collisions of relativistic nuclei provides valuable information about the mechanism of nuclear interaction at short distances and about the details of the nuclear structure. Nuclear reactions in which secondary hadrons— so-called cumulative hadrons—are emitted into the kinematically forbidden region for interactions with a free nucleon have been studied extensively at the Institute of Theoretical and Experimental Physics (ITEP, Moscow) since 1966 [1]. The main features of particle production in the kinematically forbidden region served as a basis for formulating the hypothesis of limiting nuclear fragmentation (nuclear scaling) [2]. This hypothesis was tested for a number of rather heavy nuclei (A ≥ 12). Information about the cumulative production of hadrons and nuclear fragments in reactions involving 4 He nuclei is of particular interest both for verifying whether nuclear scaling is applicable to extremely light nuclei and for testing various models of cumulative particle production. This is especially interesting since the structure of the 4 He nucleus wave functions, * **
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which follows from solutions to the equation of motion with realistic nucleon–nucleon potentials, was determined in a number of studies [3, 4]. However, the production of cumulative hadrons and nuclear fragments in proton–4 He interactions has not yet been studied systematically. Studying the yield of protons and charged nuclear fragments in the interactions of relativistic protons, deuterons, α particles, and carbon nuclei with various targets (C, CH2 , Cu, and Pb), Anderson et al. [5] extracted data on αp interaction from a comparison of the experimental results for the CH2 and C targets, but the data reported by those authors were incomplete. In [6], the inclusive distri
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