Freiburg 1998 – wissenschaftliches Programm
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T: Teilchenphysik
T 606: Strukturfkt. IV / Nukleonenspin II
T 606.5: Vortrag
Donnerstag, 26. März 1998, 09:30–09:45, HS F
Parit"atsverletzende Energieverschiebungen und Berry-Phasen in Atomen — •Thomas Gasenzer1, Dagmar Bru"s2, and Otto Nachtmann1 — 1Inst. f. Theoret. Physik, Philosophenweg 16, 69120 Heidelberg — 2ISI, Villa Gualino, Viale Settimio Severo 65, 10133 Torino, Italien
We consider hydrogen–like atoms in unstable levels of principal quantum number n=2, confined to a finite size region in a non–homogeneous electric field carrying handedness. The interplay between the internal degrees of freedom of the atoms and the external ones of their c.m. motion can produce P–odd contributions to the eigenenergies. The nominal order of such shifts is 10−8 Hz. Typically such energy shifts depend linearly on the small P–violation parameters δi≃10−12 (i=1,2), essentially the ratios of the P–violating mixing matrix elements of the 2S and 2P states over the Lamb shift, with i=1 (i=2) corresponding to the nuclear spin independent (dependent) term. We show how such energy shifts can be enhanced by a factor of ≃ 106 in a resonance like way for special field configurations where a crossing of unstable levels occurs, leading to P–violating effects proportional to √δi. Measurements of such effects can give information concerning the “spin crisis” of the nucleons.