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Vector and tensor polarization lifetimes for a stored deuteron beam.
B V Przewoski1, V A Anferov, H O Meyer
1Indiana University Cyclotron Facility, Bloomington, Indiana 47405, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 20, 2003
Summary
Researchers measured deuteron beam polarization near a resonance. The vector polarization lifetime is about twice the tensor polarization lifetime, indicating specific magnetic substate transitions.
Area of Science:
- Nuclear physics
- Particle physics
Background:
- Deuteron beams are crucial for nuclear physics experiments.
- Understanding polarization dynamics is essential for beam control.
Purpose of the Study:
- To measure the time dependence of vector and tensor polarization of a 270 MeV stored deuteron beam.
- To investigate the effects of a longitudinal magnetic field-induced depolarizing resonance on polarization lifetimes.
Main Methods:
- Stored deuteron beam experiments at 270 MeV.
- Induction of depolarizing resonance using an oscillating longitudinal magnetic field.
- Varying the distance to resonance by changing oscillation frequency.
Main Results:
- Measured the ratio of polarization lifetimes: tau(vector)/tau(tensor) = 1.9 ± 0.2.
- Found transition rates between neighboring magnetic substates (e.g., +1 to 0) are four times higher than between non-neighboring substates (+1 to -1).
Conclusions:
- The observed polarization lifetime ratio suggests specific magnetic substate transition mechanisms.
- The findings provide insights into deuteron beam depolarization processes near resonance conditions.