arXiv subjects

Yu. A. Usov

Publications and source records attributed to Yu. A. Usov.

38 records · Page 3Linked to original sources

arXiv2005

$A_N$ at small negative values of $\xf$ in the reaction $p+p(pol) \to π^0+X$ at 70 GeV and universal threshold in inclusive pion production

The talk continues the series of Single Spin Asymmetry (SSA) $π^0$ inclusive measurements carried out at Protvino 70 GeV accelerator. The asymmetry in the polarized target fragmentation region grows up in absolute value with $\xf$ decreasing and equals to $(-16 \pm 5)%$ at $-0.4<\xf<-0.25$. The result of the current experiment is in agreement with the universal threshold in pion asymmetries.

hep-ex↗

arXiv1995

Measurement of spin-dependent total cross-section difference $Δσ_T$ in neutron-proton scattering at 16 MeV

A new measurement of $Δσ_T$ for polarized neutrons transmitted through a polarized proton target at 16.2 MeV has been made. A polarized neutron beam was obtained from the $^{3}\rm{H}(d,\vec n)^{4}\rm{He}$ reaction; proton polarization over 90\% was achieved in a frozen spin target of 20 cm$^3$ volume. The measurement yielded the value $Δσ_T=(-126\pm21\pm14)$ mb. The result of a simple phase shift analysis for the $^3S_1-^3D_1$ mixing parameter $ε_1$ is presented and compared with the theoretical potential model predictions.

nucl-ex↗