Accession Number : AD0678334

Title :   BEHAVIOR OF NUCLEAR MAGNETIZATION VECTOR WHEN POLARIZING MAGNETIC FIELD IS REMOVED,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Madievskaya,E. Kh. ; Melnikov,A. V. ; Moskalev,V. V.

Report Date : 05 JAN 1968

Pagination or Media Count : 17

Abstract : The authors consider the method of free nuclear precession in weak magnetic fields and study the transition processes which take place when the polarizing magnetic field is cut off. The behavior of the nuclear magnetization vector is considered for two simple cases: (1) a change in the external field intensity while the orientation is held constant; (2) uniform rotation of the field while its intensity is held constant. In the first case, the vector of nuclear magnetization, which is directed initially along the field, does not change its direction. After a certain relaxation time, its intensity also remains constant. In the second case, the behavior of the vector is considerably dependent on the ratio of angular velocities for the Larmor precession and field rotation. The cases of fast and slow cutoff are considered. Approximate formulas are derived for calculating practical switch-off methods when using the free nuclear precession method for solving problems in metrology, geophysics and geology, radiospectroscopy, archeology, etc.

Descriptors :   (*NUCLEAR MAGNETIC RESONANCE, RELAXATION TIME), MAGNETIC FIELDS, POLARIZATION, TRANSIENTS, ROTATION, PRECESSION, USSR

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE