TY - JOUR
T1 - Performance of the neutron polarimeter NPOL2 for (p→,n→) polarization transfer measurements
AU - Wakasa, T.
AU - Sakai, H.
AU - Okamura, H.
AU - Otsu, H.
AU - Fujita, S.
AU - Ishida, S.
AU - Sakamoto, N.
AU - Uesaka, T.
AU - Satou, Y.
AU - Nonaka, T.
AU - Ohnishi, T.
AU - Greenfield, M. B.
AU - Hatanaka, K.
N1 - Funding Information:
The authors would like to thank A. Okihana, S. Kamigaito, and N. Koori for their help in the early stage of construction and development of the NPOL2 system. The experiments were performed at RCNP under Program Numbers E18, E30, E57, and E59 and also by using R/D beam time. This work is supported in part by the Grants-in-Aid for Scientific Research Nos. 6342007a nd 04402004o f Ministry of Education, Science, Sports and Culture of Japan. One of the authors, T.W., would also like to acknowledge the partial support by the Grant-in-Aid for Research Fellow of the Japan Society for the Promotion of Science (JSPS) of Ministry of Education, Science, Sports and Culture of Japan. Last but not least we would like to acknowledge the support by the staff at RCNP in various stages
PY - 1998
Y1 - 1998
N2 - A high performance neutron polarimeter NPOL2 has been constructed to measure polarization transfer observables Dij for neutron kinetic energies of Tn = 150-400 MeV. The NPOL2 system consists of 6 planes of two-dimensional position-sensitive neutron detectors with a size of 1 × 1 × 0.1 m3. Neutron polarization is determined from the azimuthal distribution of the elastic n→ + p scattering in the scintillator material. The effective analyzing powers (Ayeff) of NPOL2 have been calibrated by using the polarized neutrons from the 0° 2H(p→,n→)pp reaction at Tp = 146, 228, 296, 346 and 392 MeV as well as by using the polarized neutrons from the 0° 6Li(p→,n→)6Be(g.s.) reaction at Tp = 228 MeV. The Ay;eff values of NPOL2 have reasonable values, typically 0.223 ± 0.012 and 0.132 ± 0.004 for (n→,n) and (n→,p) channels, respectively, at Tn = 291 MeV. The figure-of-merit value defined as εD.S.(Ay;eff)2 is over 4 × 10-4 for the wide neutron kinetic energy region of Tn = 200-400 MeV, where εD.S is the double scattering efficiency.
AB - A high performance neutron polarimeter NPOL2 has been constructed to measure polarization transfer observables Dij for neutron kinetic energies of Tn = 150-400 MeV. The NPOL2 system consists of 6 planes of two-dimensional position-sensitive neutron detectors with a size of 1 × 1 × 0.1 m3. Neutron polarization is determined from the azimuthal distribution of the elastic n→ + p scattering in the scintillator material. The effective analyzing powers (Ayeff) of NPOL2 have been calibrated by using the polarized neutrons from the 0° 2H(p→,n→)pp reaction at Tp = 146, 228, 296, 346 and 392 MeV as well as by using the polarized neutrons from the 0° 6Li(p→,n→)6Be(g.s.) reaction at Tp = 228 MeV. The Ay;eff values of NPOL2 have reasonable values, typically 0.223 ± 0.012 and 0.132 ± 0.004 for (n→,n) and (n→,p) channels, respectively, at Tn = 291 MeV. The figure-of-merit value defined as εD.S.(Ay;eff)2 is over 4 × 10-4 for the wide neutron kinetic energy region of Tn = 200-400 MeV, where εD.S is the double scattering efficiency.
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U2 - 10.1016/S0168-9002(97)01149-2
DO - 10.1016/S0168-9002(97)01149-2
M3 - Article
AN - SCOPUS:0032003990
SN - 0168-9002
VL - 404
SP - 355
EP - 372
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2-3
ER -