학술논문
NMR studies on polarized12 B implanted in highly oriented pyrolytic graphite
Document Type
Article
Author
Source
Hyperfine Interactions; July 1988, Vol. 39 Issue: 3 p253-267, 15p
Subject
Language
ISSN
03043843; 15729540
Abstract
Abstract: NMR measurements on12 B nuclei implanted in a thin sheet of highly oriented pyrolytic graphite (Grafoil) have been made to study the magnitude of the polarization of12 B and its electric quadrupole coupling. The magnitude of the residual polarization of12 B held in carbon material is of crucial importance to the experiment measuring the average polarization of12 B produced in the muon capture by12 C. It was found that the polarization of12 B can be maintained at 101.02.2% in Grafoil under a magnetic field of 3 kG. The electric quadrupole coupling was determined to bee 2 qQ/h=+1207.38.2 kHz. From the magnitude and the sign of the electric field gradienteq, the location of12 B was found to be a substitutional site in the carbon lattice. The anomalous B-C bond involving thesp 2 hybrid orbitals with partially filledp z electrons is also discussed.