Performance of the neutron polarimeter NPOL3 for high resolution measurements

Abstract

We describe the neutron polarimeter NPOL3 for the measurement of polarization transfer observables $D_{ij}$ with a typical high resolution of $\sim$300 keV at $T_n$ $\simeq$ 200 MeV. The NPOL3 system consists of three planes of neutron detectors. The first two planes for neutron polarization analysis are made of 20 sets of one-dimensional position-sensitive plastic scintillation counters with a size of 100 cm $\times$ 10 cm $\times$ 5 cm, and they cover the area of 100 $\times$ 100 ${\mathrm{cm}}^2$. The last plane for detecting doubly scattered neutrons or recoiled protons is made of the two-dimensional position-sensitive liquid scintillation counter with a size of 100 cm $\times$ 100 cm $\times$ 10 cm. The effective analyzing powers $A_{y;\mathrm{eff}}$ and double scattering efficiencies ${\epsilon }_{D.S.}$ were measured by using the three kinds of polarized neutrons from the ${}^2\mathrm{H}(\vec{p},\vec{n})pp$, ${}^6\mathrm{Li}(\vec{p},\vec{n}){}^6\mathrm{Be}(g.s.)$, and ${}^{12}\mathrm{C}(\vec{p},\vec{n}){}^{12}\mathrm{N}(g.s.)$ reactions at $T_p$ = 198 MeV. The performance of NPOL3 defined as ${\epsilon }_{D.S.}(A_{y;\mathrm{eff}}{)}^2$ are similar to that of the Indiana Neutron POLarimeter (INPOL) by taking into account for the counter configuration difference between these two neutron polarimeters.

arXiv comment28 pages, 18 figures, submitted to Nucl. Instrum. Methods Phys. Res. A

References in corpus (1)

• Pion Excess, Nuclear Correlations, and the Interpretation of ($\vec{p},\vec{n}$) Spin Transfer Experiments

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