Analyzing power for neutron-proton scattering at 10 MeV

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5010890

Holslin, D T

Precise low energy neutron-proton (np) scattering experiments are now possible because of recent improvements in experimental techniques. At low energies, different potential models predict conflicting results for the np polarization. To investigate this problem, the author has measured the np analyzing power at 12 angles ({theta}{sub cm} = 45{degree}-165{degree}) for an incident neutron energy of 10.03 {plus minus} 0.05 MeV to typically {plus minus}0.10 {times} 10{sup {minus}2}. Polarized neutrons were produced using the D(d,n){sup 3}He polarization transfer reaction (typically p{sub y} = 0.57 {plus minus} 0.02). Two separate experimental techniques were used to measure the np analyzing power. In the first technique (45{degree} {le} {theta}{sub cm} {le} 130{degree}), 10 MeV neutrons are scattered from a cylindrical scintillator and are detected by two pairs of plastic scintillators placed symmetrically about the beam axis. For {theta}{sub cm} {ge} 130{degree}, a second method was used in which 10 MeV neutrons upon scattering from a thin (1.5 mm thick) plastic scintillator produced energetic recoil protons. The protons were detected in a pair of thin (1mm thick) plastic scintillators placed symmetrically about the beam axis. In both methods, fast coincidence techniques were employed. The final results were fit to a phase shift expansion of A{sub np}({theta}), and with only P and D waves included the {chi}{sup 2}/d.f. was 0.95. Predictions from three potential models were also compared to the final results. The Paris potential ({chi}{sup 2}/d.f. = 1.94) and Nijmegen potential ({chi}{sup 2}/d.f. = 1.92) represent the present results much better than the Bonn potential ({chi}{sup 2}/d.f. = 7.00).

• Research Organization: Wisconsin Univ., Madison, WI (USA)
• OSTI ID: 5010890
• Country of Publication: United States
• Language: English

Related Subjects

651000* -- Nuclear Physics
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BARYONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
ELEMENTARY PARTICLES
ENERGY RANGE
ERRORS
FERMIONS
HADRON REACTIONS
HADRONS
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 10-100
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
POLARIZATION
PROTONS
RADIATION DETECTORS
SCATTERING
SCINTILLATION COUNTERS
TARGETS