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- Jonsell, Svante, et al.
(författare)
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Fine Structure in Cold Collisions of Spin-Polarized H(2s) Atoms
- 2004
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Ingår i: Physica scripta. T. - 0281-1847. ; T110, s. 299-301, s. 299-301
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Tidskriftsartikel (refereegranskat)abstract
- We have calculated cross sections and rate coefficients for elastic scattering, ionization, and double excitation transfer in collision of two hydrogen atoms in the 2s state. We find that for collision energies between 5 × 10-10 a.u. and 10-6 a.u. elastic scattering has the largest cross section. For temperatures below 0.02 K ionization is the dominant loss process, while for higher temperatures double excitation transfer dominates. Our results for the total loss rate are found to be within a factor 2 or 3 of the error bars of recent measurements.
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| 3. |
- Jonsell, Svante, et al.
(författare)
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Strong Nuclear Force in Cold Antihydrogen : Helium Collisions
- 2004
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - New York, N.Y. : Publ. by the American Physical Society through the American Institute of Physics. - 1050-2947 .- 1094-1622. ; 70:6, s. 062708-
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Tidskriftsartikel (refereegranskat)abstract
- We calculate cross sections for elastic scattering and annihilation in antihydrogen-helium collisions at low energies. The calculations are based on the Born-Oppenheimer approximation, and incorporate the effects of the strong interaction through a scattering length approach. We find that the strong nuclear force not only causes significant annihilation, but also cannot be neglected in the elastic channel. In the zero energy limit we obtain the scattering length a=−7.69−3.80i a.u. for ground state antihydrogen-helium collisions. Annihilation is found to dominate over elastic scattering up to a temperature about 3 K. Loosely bound metastable antihydrogen-helium states are also investigated, and it is found that a number of relatively long-lived states with up to three units of angular momentum exist.
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| 4. |
- Zygelman, Bernard, et al.
(författare)
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Cold Collisions of Atomic Hydrogen with Antihydrogen Atoms : an Optical Potential Approach
- 2004
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 69:4, s. 042715-
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Tidskriftsartikel (refereegranskat)abstract
- The non-adiabatic couplings between the ground state and the first 5 excited states in (HeT+)-He-3 have been calculated. Non-adiabatic corrections to the beta-decay spectrum of T-2 are derived in first-order perturbation theory. These corrections are esti
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