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Radiative capture of polarized deuterons by [sup 6]Li and the D-state of [sup 8]Be

Thesis/Dissertation ·
OSTI ID:7197356

Measurements of angular distributions of the cross section, [sigma]([theta]), and vector and tensor analyzing powers have been obtained at E[sub d] (lab) = 9.0 MeV and E[sub d] (lab) = 2.0 MeV for the [sup 6]Li([rvec d],[gamma])[sup 8]Be reaction. The measured analyzing powers include A[sub yy]([theta]) and A[sub y]([theta]) at E[sub d] (lab) = 2.0 MeV and A[sub yy] ([theta]), A[sub y] ([theta]) and T[sub 20]([theta]) at E[sub d] (lab) = 9.0 MeV. Energy excitation functions of the differential cross section, [sigma]([theta]) at [theta] = 130[degrees] were measured from E[sub d] (lab) = 7.0 MeV to E[sub d] (lab) = 14.0 MeV. Transition matrix element analyses of the angular distributions at E[sub d] (lab) = 9.0 MeV and E[sub d] (lab) = 2.0 MeV were performed. The results show the presence of 13% to 21% E1 radiation in addition to the dominant E2 radiation at E[sub d] (lab) = 9.0 MeV and a dominant E1 radiation contribution, instead of dominant E2 radiation, of 57% at E[sub d] (lab) = 2.0 MeV. The largest E1 component at both energies is the isospin forbidden E1 transition comprising 10% of the cross section at E[sub d] (lab) = 9.0 MeV and 40% of the cross section at E[sub d] (lab) = 2.0 MeV. The angular distributions at E[sub d] (lab) = 9.0 MeV were compared to a simple direct capture (DC) calculation. The dominant E2 direct capture calculation gave a reasonable description of the tensor analyzing power A[sub yy] ([theta]) but failed to reproduce the cross section [sigma]([theta]) and the vector analyzing power A[sub y]([theta]). This model leads to a D-state probability of P[sub D] = 0.5% for the ground state of [sup 8]Be. A multichannel resonating group model (MCRGM) calculation was also performed. This calculation provided a fairly good representation of the data and predicts a D-state probability of P[sub D] = 0.3% for the ground state of [sup 8]Be.

Research Organization:
Duke Univ., Durham, NC (United States)
OSTI ID:
7197356
Country of Publication:
United States
Language:
English

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Related Subjects

663440* -- D-
T-
& He-induced Reactions & Scattering-- (1992-)
663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
ANALYZING POWER
ANGULAR DISTRIBUTION
BEAMS
BERYLLIUM 8
BERYLLIUM ISOTOPES
CAPTURE
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
D STATES
DEUTERONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
GAMMA RADIATION
HEAVY ION REACTIONS
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM 6 REACTIONS
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
NUCLEI
POLARIZED BEAMS
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES