Performance of neutron polarimeter SMART-NPOL

Abstract The neutron polarimeter SMART-NPOL has been constructed at the RIKEN Accelerator Research Facility for measuring polarization correlations of proton–neutron systems. The SMART-NPOL system consists of 12 parallel neutron counter planes of two dimensionally position-sensitive plastic scintillators with a size of 60 × 60 × 3.0 cm 3 . Polarimetry measurements were made using the analyzing power of the H 1 ( n ⇒ , n ) H 1 reaction occurring in the plastic scintillators. The effective analyzing power of SMART-NPOL was measured with polarized neutrons from the zero-degree Li 6 ( d ⇒ , n ⇒ ) reaction with an incident deuteron energy of 135 MeV / A . The effective analyzing power thus obtained was 0.26 ± 0 . 01 stat ± 0 . 03 syst and the double scattering efficiency was 1.1 × 10 - 3 .

[1]  T. Noro,et al.  Construction and performance of one- and two-dimensional large position-sensitive liquid and plastic scintillation detectors — an application to a neutron polarimeter , 1992 .

[2]  K. Assamagan,et al.  Calibration of a neutron polarimeter in the 0.2 1.1 GeV region , 2006 .

[3]  A. Shimony,et al.  Proposed Experiment to Test Local Hidden Variable Theories. , 1969 .

[4]  T. Ichihara,et al.  Spin-Isospin Resonances Observed in the (d,2He) and (12C,12N) Reactions at E/A = 135 MeV , 1994 .

[5]  H. Okamura.  Fast data acquisition system for the spectrometer SMART at RIKEN , 2000 .

[6]  H. Sakaguchi,et al.  Polarization transfer measurements for the (d, pX) reaction at Ed = 65 MeV and the reaction mechanism for the protons in the continuum , 1989 .

[7]  D. Horen,et al.  A neutron polarimeter for (p, n) measurements at intermediate energies , 1985 .

[8]  H. Sakai,et al.  PERFORMANCE OF THE NEUTRON POLARIMETER NPOL2 FOR (P,N) POLARIZATION TRANSFER MEASUREMENTS , 1998 .

[9]  G. G. Ohlsen.  POLARIZATION TRANSFER AND SPIN CORRELATION EXPERIMENTS IN NUCLEAR PHYSICS. , 1972 .

[10]  W. Leo.  Techniques for Nuclear and Particle Physics Experiments: A How-To Approach , 1987 .

[11]  R. Serber,et al.  The Production of High Energy Neutrons by Stripping , 1947 .

[12]  Goodman,et al.  Zero-degree cross sections for the 7Li(p,n)7Be(g.s.+0.43-MeV) reaction in the energy range 80-795 MeV. , 1990, Physical review. C, Nuclear physics.

[13]  J. Watson,et al.  A high-performance polarimeter for medium-energy neutrons , 1988 .

[14]  C. Glashausser,et al.  POLARIZATION PHENOMENA IN NUCLEAR REACTIONS. , 1969 .

[15]  O. Baker,et al.  Calibration of a neutron polarimeter to measure the electric form factor of the neutron , 1998 .

[16]  N. Matsuoka,et al.  Deuteron break-up in the fields of nuclei at 56 MeV , 1980 .

[17]  J. Bell.  On the Einstein-Podolsky-Rosen paradox , 1964 .

[18]  J. Schambach,et al.  Polarimeters for medium-energy neutrons , 1989 .

[19]  H. Sakamoto,et al.  Polarization transfer in the deuteron break-up reaction at 56 MeV , 1985 .

[20]  F. D. Santos.  Polarization transfer in deuteron stripping reactions , 1974 .

[21]  C. Foster,et al.  INPOL – the Indiana University Neutron Polarimeter , 2001 .

[22]  H. Sakai,et al.  Absolute calibration of the deuteron beam polarization at intermediate energies via the 12C(d⇒,α)10B*[2+] reaction , 2007 .

[23]  Y Maeda,et al.  Spin correlations of strongly interacting massive fermion pairs as a test of Bell's inequality. , 2006, Physical review letters.