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

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


We describe the neutron polarimeter NPOL3 for the measurement of polarization transfer observables Dij with a typical high resolution of ∼300 keV at Tn≃200MeV. 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 × 10 cm × 5 cm, and they cover the area of 100×100cm2. 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 100cm×100cm×10cm. The effective analyzing powers Ay;eff and double scattering efficiencies εD.S. were measured by using the three kinds of polarized neutrons from the 2H(p→,n→)pp, 6Li(p→,n→)6Be(g.s.), and 12C(p→,n→) 12N(g.s.) reactions at Tp=198MeV. The performance of NPOL3 defined as εD.S.(Ay;eff)2 are similar to that of the Indiana Neutron POLarimeter by taking into account for the counter configuration difference between these two neutron polarimeters.

Original languageEnglish
Pages (from-to)569-582
Number of pages14
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
Publication statusPublished - Aug 1 2005

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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