K$sup -$-MESONIC ATOMS

Journal Article · Sat Jun 15 04:00:00 EDT 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.130.2352· OSTI ID:4667268

Eisenberg, Y; Kessler, D

Computational techniques previously used for the treatment of /sup -/ - and ceramic materia /sup -/-mesonic atoms are extended to K/sup -/mesonic atoms and x-ray yields for the most important transitions are calculated as a function of atomic number. It is shown that the experimental measurement of these yields will provide a sensitive determination of the imaginary part of the K/sup -/-nucleus optical potential. The level shifts due to the meson scattering interaction are also discussed. In principle, one can relate the level shifts to the real part of the zero-energy scattering lengths with the help of the theory of Deser et al.; however, the calculations show that, for the ground state, such measurements will be more difficult to perform than in ceramic materia /sup -/- mesonic atoms because of the low yields of the K lines. Therefore, an attempt was made to predict the shiits of the 2p state. It turns out that these shifts are expected to be measurable, both from the point of view of magnitude and yield, for the elements from carbon to fluorine. The Auger electron spectra from stopping K/sup -/ mesons in nuclear emulsion are derived from the cascade calculations. In particular, it is shown that the expected fraction of K/sup -/ captures associated with at least one Auger electron of more than 15 kev energy is 4% in the light (C,N,O) and 88% in the heavy (AgBr) emulsion elements. An experiment on Auger electrons in nuclear emulsion is described. Whereas the theoretical and experimental numbers of K/sup -/ stoppings associated wtth electrons are in good agreement, there are systematic discrepancies in the details of the energy and multiplicity spectra that are, most probably, due to experimental uncertainties. The level shifts in ceramic materia -mesonic atoms are briefly discussed in an Appendix. (auth)

• Research Organization: Weizmann Inst. of Science, Rehovoth, Israel
• NSA Number: NSA-17-026568
• OSTI ID: 4667268
• Report Number(s): IA-805; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 130; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ATOMS
AUGER EFFECT
CAPTURE
CARBON
DECAY
ELECTRONS
ENERGY LEVELS
EXCITATION
FIELD THEORY
FOURIER ANALYSIS
KAONS
KAONS-MINUS
MEASURED VALUES
NITROGEN
NUCLEAR EMULSIONS
NUCLEAR MODELS
NUMERICALS
OPTICAL MODEL
OXYGEN
PHYSICS
PIONS
PRODUCTION
SCATTERING
SCATTERING AMPLITUDE
SILVER BROMIDES
SPECTRA
TRANSITIONS
X RADIATION