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28 March 2024
 
  » arxiv » nucl-ex/0502006

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Performance of the neutron polarimeter NPOL3 for high resolution measurements
T. Wakasa ; Y. Hagihara ; M. Sasano ; S. Asaji ; K. Fujita ; K. Hatanaka ; T. Ishida ; T. Kawabata ; H. Kuboki ; Y. Maeda ; T. Noro ; T. Saito ; H. Sakai ; Y. Sakemi ; K. Sekiguchi ; Y. Shimizu ; A. Tamii ; Y. Tameshige ; K. Yako ;
Date 3 Feb 2005
Journal Nucl.Instrum.Meth. A547 (2005) 569-582
Subject nucl-ex
AbstractWe 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 $ imes$ 10 cm $ imes$ 5 cm, and they cover the area of 100 $ imes$ 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 $ imes$ 100 cm $ imes$ 10 cm. The effective analyzing powers $A_{y;mathrm{eff}}$ and double scattering efficiencies $epsilon_{mathrm{D.S.}}$ were measured by using the three kinds of polarized neutrons from the ${}^{2}{ m H}(vec{p},vec{n})pp$, ${}^{6}{ m Li}(vec{p},vec{n}){}^{6}{ m Be}(mathrm{g.s.})$, and ${}^{12}{ m C}(vec{p},vec{n}){}^{12}{ m N}(mathrm{g.s.})$ reactions at $T_p$ = 198 MeV. The performance of NPOL3 defined as $epsilon_{mathrm{D.S.}}(A_{y;mathrm{eff}})^2$ are similar to that of the Indiana Neutron POLarimeter (INPOL) by taking into account for the counter configuration difference between these two neutron polarimeters.
Source arXiv, nucl-ex/0502006
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