An effective range determination of phase shifts for the elastic proton helium-3 reaction between the energies of 0 and 12 MeV

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7005268

Alley, M T

New measurements have been made of the observables from the [sup 3][rvec H]e ([rvec p], p)[sup 3]He reaction in the energy range of 0 to 12 MeV. The new data were used in a global phase shift fit that utilized an energy dependent expansion of the phase shift parameters. The observable measurements were made possible through the construction of a new polarized [sup 3]He target for use with the Wisconsin tandem accelerator. The design of the polarized [sup 3]He target consisted of a low pressure double cell system which allowed the scattering cell to be cooled for increased target densities. The optimal pumping medium was an infrared LNA laser that provided approximately 1 watt of power at the wavelength of 1.083 [mu]m. The target was designed to produce polarizations along the three lab axes of [cflx x], [cflx y] and [cflx x]. The scattering observables were measured with the Wisconsin crossed-beam polarized proton source and the new [sup 3][rvec H]e target. Measurements of the proton analyzing power (A[sub y0]), [sup 3]He analyzing power (A[sub 0y]) and spin correlation coefficient A[sub yy], were performed for 10 angles at each of the five energies of 4.01, 5.54, 7.03, 8.52 and 10.01 MeV. Measurements were also made of the spin correlation coefficients A[sub xx], A[sub zz], A[sub xz], and A[sub zx] at 5.54 MeV. A new procedure was developed to express the scattering observables as functions of the phase shifts. The parameterization of the phase shifts was accomplished using a modified effective range expansion for each parameter. This was incorporated into a computer search routine that performed a global fit on the new measurements plus over 900 existing [sup 3]He(p,p)[sup 3]He observables. The addition of the new spin correlation measurements into the database has made it possible to uniquely specify the low energy phase shifts. The final fit has a reduced [chi][sup 2][sub nu] per degree of freedom of 0.959, and a confidence level of 0.823.

• Research Organization: Wisconsin Univ., Madison, WI (United States)
• OSTI ID: 7005268
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BEAMS
CHARGED-PARTICLE REACTIONS
COLLIDING BEAMS
DATA
EFFECTIVE RANGE THEORY
ELASTIC SCATTERING
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
HELIUM 3 REACTIONS
INFORMATION
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PHASE SHIFT
PROTONS
SCATTERING
STATISTICAL DATA