43 research outputs found
Resonant Formation of Molecules in Deuterium: An Atomic Beam Measurement of Muon Catalyzed dt Fusion
Resonant formation of molecules in collisions of muonic tritium
() on D was investigated using a beam of atoms,
demonstrating a new direct approach in muon catalyzed fusion studies. Strong
epithermal resonances in formation were directly revealed for the
first time. From the time-of-flight analysis of fusion
events, a formation rate consistent with times the theoretical prediction was obtained. For the largest
peak at a resonance energy of eV, this corresponds to a rate
of s, more than an order of magnitude larger
than those at low energies.Comment: To appear in Phys. Rev. Let
Energy Level Displacement of Excited np State of Kaonic Deuterium In Faddeev Equation Approach
We calculate the energy level displacement of the excited state of
kaonic deuterium in terms of the P-wave scattering length of scattering.
We solve the Faddeev equations for the amplitude of scattering in the
fixed centre approximation and derive the complex P-wave scattering length of
scattering in terms of the S-wave and P-wave scattering lengths of
scattering. The estimated uncertainty of the complex P-wave
scattering length is of about . For the calculated width of the excited state of kaonic deuterium we evaluate
the yield of -rays for the emission line
of kaonic deuterium. Using the complex S-wave and P-wave scattering lengths of
scattering, calculated in \cite{ECL1,Weise1}, we get the width
of the excited state and the yield
of -rays for the emission line of kaonic
deuterium. The results, obtained in this paper, can be used for the planning of
experiments on the measurements of the energy level displacement of the ground
state of kaonic deuterium, caused by strong low-energy interactions.Comment: 13 page
Measurement of the Resonant Molecular Formation Rate in Solid HD
Measurements of muon-catalyzed dt fusion () in solid
HD have been performed. The theory describing the energy dependent resonant
molecular formation rate for the reaction + HD is
compared to experimental results in a pure solid HD target. Constraints on the
rates are inferred through the use of a Monte Carlo model developed
specifically for the experiment. From the time-of- flight analysis of fusion
events in 16 and 37 targets, an average formation rate
consistent with 0.897(0.046) (0.166) times the
theoretical prediction was obtained.Comment: 4 pages, 5 figure
On radiative np -> 1s + gamma transitions, induced by strong low-energy interactions,in kaonic atoms
We calculate the rates of the radiative transitions np -> 1s + gamma in
kaonic hydrogen and kaonic deuterium, induced by strong low-energy interactions
and enhanced by Coulomb interactions. The obtained results should be taken into
account for the theoretical analysis of the experimental data on the X-ray
spectra and yields in kaonic atoms.Comment: 10 pages, 1 figur
Energy level displacement of excited np states of kaonic hydrogen
We compute the energy level displacement of the excited np states of kaonic
hydrogen within the quantum field theoretic and relativistic covariant model of
strong low-energy bar-KN interactions suggested in EPJA21, 11 (2004). For the
width of the energy level of the excited 2p state of kaonic hydrogen, caused by
strong low-energy interactions, we find Gamma_2p = 2 meV. This result is
important for the theoretical analysis of the X-ray yields in kaonic hydrogen.Comment: 20 pages, no figures, Latex, new references are adde
Proton Zemach radius from measurements of the hyperfine splitting of hydrogen and muonic hydrogen
While measurements of the hyperfine structure of hydrogen-like atoms are
traditionally regarded as test of bound-state QED, we assume that theoretical
QED predictions are accurate and discuss the information about the
electromagnetic structure of protons that could be extracted from the
experimental values of the ground state hyperfine splitting in hydrogen and
muonic hydrogen. Using recent theoretical results on the proton polarizability
effects and the experimental hydrogen hyperfine splitting we obtain for the
Zemach radius of the proton the value 1.040(16) fm. We compare it to the
various theoretical estimates the uncertainty of which is shown to be larger
that 0.016 fm. This point of view gives quite convincing arguments in support
of projects to measure the hyperfine splitting of muonic hydrogen.Comment: Submitted to Phys. Rev.