Abstract
Deuteron Spin Structure (DSS) collaboration program is aimed on few nucleon correlations investigation using unpolarized and polarized deuteron beam at intermediate energy range. Data of the dp breakup reaction have been obtained at energy range from 300 - 500 MeV of deuteron energy for various detector configurations in region where few nucleon correlations and relativistic effects can play significant role. Results are obtained in the form of S-curve and T20 and iT11 tensor analyzing powers in case of unpolarized and polarized data, respectively. Future plans on extracted deuteron beam of Nuclotron are concerned to tensor analyzing power T20 and spin correlation Cyy of 3He(d, p)4He reaction in the kinetic energy range between 1.0 and 1.75 GeV.
Highlights
The most used contribution in theoretical models which include three nucleon forces (3NFs) are two pion exchange, e.g. Urbana IX [1] and Tucson-Melbourne [2]
Energy and S distributions of dp breakup reaction obtained in coplanar kinematics at 200 MeV/n were discussed
Obtained values of vector analyzing power at 72.3° and 76.5° in cm measured under pp quasi conditions are in agreement with world data within experimental accuracy
Summary
The most used contribution in theoretical models which include three nucleon forces (3NFs) are two pion exchange, e.g. Urbana IX [1] and Tucson-Melbourne [2]. Cross section of reactions with few nucleons in which is nucleon unpolarized is better described than for the polarized case. Spin structure of the np SRCs has been investigated via the measurements of the tensor analyzing power Ayy in deuteron inclusive breakup at various energies in the wide regions of the longitudinal x F and transverse proton momentum pT [3]. In the vicinity of the Sagara discrepancy the currently known 3NFs contribute by up to 30% to the dp elastic scattering cross section at intermediate energies [6]. The investigation of dp breakup reaction at deuteron energy of 270 MeV at RIKEN [7] and IUCF [8] reveals that vector analyzing power Ay can be described using NN forces only. Other polarization observables need 3NFs to describe the data.
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