Tensor target spin asymmetries [Formula: see text] ([Formula: see text]=0,1,2) in the reaction [Formula: see text] are studied for photon energies from [Formula: see text]-threshold up to 1.5[Formula: see text]GeV with inclusion of rescattering effects. It is shown that the influence of rescattering effects on the tensor target spin asymmetries is sizable in the energy region near [Formula: see text]-threshold. At higher energies, much smaller influence of rescattering effects is seen. The sensitivity of the obtained results to the elementary pion photoproduction operator is investigated and a considerable dependence is found, in particular at forward pion angles. In addition, a comparison with results of other theoretical models is also given. The extracted spin asymmetries are compared with available experimental data and a qualitative agreement is obtained. The predictions presented here may be useful to interpret the recent measurements from the VEPP-3 electron storage ring.
The Equation of State (EOS) of pure neutron matter at zero temperature is calculated up to five saturation densities within the Brueckner theory with the inclusion of three-body forces. Three different realistic and accurate two-body forces are considered to evaluate the G-matrix effective interaction for nuclear matter. These models are the chiral N 3 LO, the CD-Bonn and the Argonne V 18 , which give quite different EOS. Two types of three-body forces are included to the effective interaction, which might be important at densities several times that of nuclear matter density. Using a microscopic EOS for pure neutron matter, static properties of non-rotating neutron stars such as masses and radii are evaluated. The resulting maximum masses of neutron stars using different interactions near 2M ʘ are found to be in reasonable agreement with the measured ones PSR J1614−2230 (with M max = 1.97 ± 0.04 M ʘ ) and PSR J0348+0432 (with M max = 2.01 ± 0.04 M ʘ ).
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