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EXA 2011 pp 21-24 | Cite as

Collisional transitions between HFS states of antiprotonic 3He in the presence of microwave radiation

  • Sergey N. Yudin
  • Grigory Ya. KorenmanEmail author
Conference paper

Abstract

We consider collisional effects on the transitions between HFS states of \(({\bar{\rm p}\,^3{\rm He}}^+)\) in the presence of microwave radiation. Cross sections and rates of collisional HFS transition, density shifts and broadening of M1 spectral lines are calculated within the approach developed previously for \(({\bar{\rm p}\,^4{\rm He}}^+)\). The values averaged over thermal motion are used in the quantum master equation for the density matrix of HFS states in the microwave field. At the target density 3 × 1020 cm − 3 and T = 6 K, partial rates of the single spin-flip transition in \((\bar{{\rm p}}\,^3\mathrm{He}^+)\) are ∼1 · 106 s − 1. Effective relaxation rates by considering the kinetics are approximately twice more. At the same conditions collisional shifts of the M1 spectral lines are ≤ 4 kHz, collisional broadening of the lines is ≃ 0.5 MHz. The total width of the line J  − − + J  + − +  at t d  = 350 ns is 2.4 MHz allowing for collisional and Fourier broadenings. Maximum MW resonance signal in 3He is about 0.5 of that one in 4He.

Keywords

Antiproton Antiprotonic helium Hyperfine splitting Collisional transitions 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Institute of Nuclear PhysicsMoscow State UniversityMoscowRussia

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