Proton target polarization measured with a polarized neutron beam at 477 MeV

doi:10.1016/0168-9002(87)90702-9

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 254, Issue 2, 15 February 1987, Pages 469-471

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Abstract

The polarization of a proton target is determined with elastic neutron-proton scattering at 477 MeV. The results agree well with the nuclear magnetic resonance measurements at the error level of 4%.

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Cited by (7)

Calibration of the polarization of a frozen spin target
1991, Nuclear Inst. and Methods in Physics Research, A
A recent experiment, measuring the spin correlation parameter A_nn in neutron-proton elastic scattering to a precision of ±0.03 at several energies in the range 200 to 500 MeV, required the polarization of the proton frozen-spin target used in the experiment to be known to an accuracy of ±2%. The calibration of the polarization of the frozen-spin target was accomplished through an experiment interleaved with the A_nn experiment. An unpolarized proton beam, of an intensity comparable to the intensity of the neutron beam in the A_nn experiment, was scattered at 24° (lab.) from the frozen-spin target at energies of 468 and 501 MeV. From the measured left-right asymmetries and knowledge of the proton-proton analyzing powers, A_y(24°, 468 MeV) = 0.4087±0.0060 and A_y(24°, 501 MeV) = 0.4204±0.0059, the target polarizations could be deduced. The weighted average of the ratios of the target polarization deduced in the scattering experiment and obtained from nuclear magnetic resonance measurements was found to be P_t(scattering)/P_t(NMR) = 0.962±0.008(stat)±0.021(sys)±0.014(sys) at 468 MeV and 0.950±0.005(stat)±0.020(sys)±0.013(sys) at 501 MeV. By dividing the target cell holding the butanol beads, as illuminated by the incident proton beam, in three parts (top, middle, and bottom), a determination of the average polarization for each of the three parts was made. A clear decrease of the polarization going from the top to the bottom of the target cell was found.
Charge symmetry, quarks and mesons
1990, Physics Reports
Charge symmetry breaking (CSB) in particle and nuclear physics is reviewed. The data and theory relevant to understand CSB in hadronic mass spittings, interactions and decay rates; nucleon-nucleon interactions; nuclear reactions; and binding energies of mirror nuclei are examined. This vast information is consistent with the hypothesis that the difference between the masses of the up and down quarks plus electromagnetic interactions amongst quarks causes all CSB.
NMR measurements on the triumf polarized deuterium target
1989, Nuclear Inst. and Methods in Physics Research, A
The NMR system and the polarization measurements of the TRIUMF polarized deuterium target are described. The NMR tuned circuit is kept resonant at all frequencies to allow for a high gain in the rf amplifiers and to permit the measurement of the real part of the NMR signal. A Starburst (J-11) and an LSI-11 are used to process the NMR signal at a high sample rate. A synthesizer under the control of an 8085 based microprocessor (TRIMAC) provides the rf sweep. Vector polarizations between −0.33 and −0.40 were routinely achieved during a four week run in the TRIUMF M11 pion beamline with a statistical uncertainty of 3.4% and a systematic uncertainty of 5%.
The frozen spin polarized proton target at TRIUMF for intermediate energy neutron scattering
1988, Nuclear Inst. and Methods in Physics Research, A
A polarized proton target with a volume of 55 cm³ was constructed at TRIUMF to study neutron induced reactions. The polarizable protons were contained in the molecules of 1-butanol that was frozen in the form of beads and placed in the mixing chamber of a vertical dilution refrigerator. The target system was operated about 2000 h for a high precision neutron scattering experiment to test charge symmetry breaking. The highest polarization achieved was −0.97. The relaxation time was typically 150 h in a magnetic field of 0.257 T and at a temperature of 60 mK.
Np elastic scattering analyzing power characteristics at intermediate energies
1989, Physical Review C
Spin correlation parameter and analyzing power in n-p elastic scattering at intermediate energies
1989, Physical Review C

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Letter to the editorProton target polarization measured with a polarized neutron beam at 477 MeV

Abstract

Nucl. Instr. and Meth.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr. and Meth.

Comments Nucl. Part. Phys.

Letter to the editor
Proton target polarization measured with a polarized neutron beam at 477 MeV