Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Elektromagnetische und Hadronische Sonden I

HK 44.7: Vortrag

Freitag, 14. März 2008, 15:45–16:00, 1B/C

Decays, contact P-wave interactions and hyperfine structure in Omega- exotic atoms — •Mikhail Krivoruchenko and Amand Faessler — Institut für Theoretische Physik der Universität Tübingen, Baden-Württemberg

Contact P-wave interactions connected to the Larmor interaction of a magnetic dipole and Thomas spin precession in the filed of an electric quadrupole are described and their implications for spectroscopy of exotic Omega-atoms are studied. In order to evaluate the magnitude of the contact P-wave interactions as compared to the conventional long-range interactions and the sensitivity of spectroscopic data to the Omega-hyperon quadrupole moment, we consider 2P states of Omega-atoms formed with light stable nuclei with spins I > 1/2 and atomic numbers Z < 10. The energy level splitting caused by the contact interactions is 2-5 orders of magnitude smaller than the conventional long-range interactions. Strong decay widths of p-Omega- atoms due to reactions p+Omega- -> Lambda+Xi + 180 MeV, induced by t-channel kaon exchange, are calculated. Omega- atoms formed with the light nuclei have strong widths 5-6 orders of magnitude higher than splittings caused by the contact interactions. The low-L pattern in the energy spectra of intermediate- and high-Z Omega-atoms thus cannot be observed. The Omega- quadrupole moment can be measured by observing x-rays from circular transitions between high-L levels in Omega- exotic atoms. The effect of strong interactions in 208Pb-Omega- is negligible starting from L = 10.The contact P-wave interactions exist in ordinary atoms and muonic atoms.