Speaker
Description
Investigations of few-nucleon systems provide suitable testing ground for different models of the nucleon-nucleon interaction. In three-nucleon systems, at intermediate energy, below the pion production threshold, the effects of three-nucleon forces (3NF) are generally small and hard for experimental study. To take a step forward into larger system, a four-nucleon (4N) were studied, where sensitivity to the 3NF effects becomes higher. Recently, the development of the 4N system calculations became a hot topic in theoretical nuclear physics. The Vilnus-Lisbon group calculates observables for multichannel reactions, also above the breakup threshold, and with the Coulomb force included [1].
Experiment devoted to studies of deuteron breakup reactions were carried out at KVI in Groningen (The Netherlands) with the use of the BINA detector and 160 MeV deuteron beam on deuteron target. The experiment is a continuation of previous very successful few-nucleon reaction studies [2, 3]. The aim of this analysis was to study two kinds of reaction, three-body 2H(d,dp)n deuteron breakup and the transfer reaction 2H(d,3He)n. The differential cross section of breakup reaction can be confronted with the newest calculation for the deuteron-deuteron system based on so-called Single-Scattering-Approximation (SSA). Recently developed techniques allows us to identify the neutrons in the BINA detection systems. This gives us possibility to study also the breakup reaction in a channel with direct neutron detection. Having determine the differential cross sections for both,2H(d,dp)n and 2H(d,dn)p three-body breakup channels one can compare it at the same kinematic conditions and directly study the Coulomb effects and possible charge symmetry breaking, like it was suggested in [5].
In this contribution I will show the results of the study of the deuteron-deuteron system with the use of BINA setup at 160 MeV. A set of data for differential cross section of the 2H(d,dp)n breakup [6] and 2H(d,3He)n transfer [7] reaction will be presented. In addition the preliminary results of the neutron detection method and the differential cross section of the 2H(d,dn)p will be outlined.
References
[1] A. Deltuva, A. C. Fonseca, Phys. Rev. C 95 (2017) 024003
[2] S. Kistryn, E. Stephan, J. Phys. G 40, (2013) 063101.
[3] I. Ciepal et al., Few-Body Syst. 56 (2015) 665
[4] G. Khatri et al., Acta Phys. Pol., B 47 (2016) 411
[5] C. R. Howell et al., Phys. Rev. C 48 (1993) 2855.
[6] I. Ciepal et al., Phys. Rev. C 99, (2019) 014620.
[7] I. Ciepal et al., Phys. Rev. C 100, (2019) 024003.
