Lali Chatterjee

Branching ratio for sticking in muon catalysed fusion

Abstract A proper evaluation of the sticking factor as the branching ratio W s of stuck to all possible final states results in a reduction of the intrinsic sticking w 0 s as conventionally calculated. This establishes that phase space effects influence the rates and cause significant corrections that must be considered for contact with experiment. Numerically the percentage sticking is reduced by 0.2 for fusion in (dtμ), and for the (ddμ) case the value obtained for W s is in agreement with experiment and other theories.

Sub-barrier nuclear fusion of amuonic and muonic flavour

Abstract Sub-barrier nuclear d-d fusion has been investigated for low energies, using the Allis-Morse cut-off type screening potential. It is found that cut-off parameters smaller than 0.1 A are required to explain the new experimental results for cold fusion in condensed matter. Possible theoretical bases for realising such anomalous screening conditions are explored. The study is extended to collisional muon catalysed fusion as well.

Stochastic continuum to bound transitions of the negative muon in the nuclear coulomb field

Cross sections for radiative Coulomb capture of muons in hydrogen are shown to be enhanced by two orders of magnitude for muon energies in the neighbourhood of 2.8 keV. This effect has not been recognised earlier and has important consequences for negative muon physics as shown.

Quantum Electrodynamic Study of Electron Capture by Light Stripped Ions

We report the numerical results of a rearrangement charge transfer process calculated by direct application of relativistic Quantum Electro-dynamics in the Lorentz gauge. Results for single electron capture by fully stripped Li ions from neutral (1S) Hydrogen show very good agreement with experiments and with Coulomb Born methods for energies above 300 keV.

(pμ-d)+ formation studied quantumelectrodynamically

Abstract Formation rates of mesic molecules influence greatly the rate of muon catalysed fusion of the relevant nuclei. We have calculated the rate of formation of (pμ-d)+ at thermal equilibrium, using quantumelectrodynamics, and our value is in agreement with existing experimental and theoretical results.

On heavy ion collisions as a muon source

We explore the possibility of heavy ion collisions providing an efficient pion, and eventually muon source for research purposes and for ultimate utilisation of muon catalysed fusion.

De‐excitation of muonic molecules by internal conversion

The most effective process for effecting de−excitation of the muonic molecule, tdμ, is internal conversion : the excitation energy is carried away by one of the molecular electrons. Using previously calculated wave functions for all the J=0 and J=1 states of the muonic molecular ions we have calculated the transition rates for internal conversion. Also, we have made the first variational calculation of the J=2 wave function of the tdμ ion, obtaining a binding energy of 101.59 eV. (AIP)

The muon as a deep nuclear probe

The status of the Fermilab Experiment E 802 entitled “Deep inelastic muon interaction with nuclear targets using emulsion telescope technique” is reported. GeV muons in matter probe deep within the nucleus to yield rich information on the quark structure and other features. The EMC effect, the modification of the quark response due to various nuclear environments along with topological and scaling characteristics are being studied. The status of the collaborative project INT-9118888 sanctioned by the National Science Foundation (USA) to enable participation of the Jadvapur University Group in collaboration with Fermilab in E 782 along with E 802 is also reported. E 782 is a unique bubble chamber muon experiment investigating the deep inelastic structure functions using the Tohoku Bubble Chamber and is a Tohoku University, Japan-Fermilab (USA) collaboration involving also other institutes in the USA and the Institute of High Energy Physics, China.

Formation of fast exotic atoms by radiative Coulomb capture

Interesting surprises in some exotic atom kinetics have been reported recently. These involve muonic atom transfer cross sections, nuclear pion capture and theq 1s effect in μCF. These can be explained if the exotic atom population contains a contributing fast component. Such fast atoms can be formed by radiative continuum to bound transitions of fast (keV) muons or pions. Cross sections for formation of such fast pionic and muonic atoms and their velocity distributions are reported. The possibility of these processes competing with the thermalisation channels and contributing effectively to the exotic atom population is discussed.

ANALYTIC APPROACH TOq SYSTEMS IN POTENTIAL MODELS

Analytic solutions for qq systems obtained from a cut-off type approximation to the funnel potential are applied to bb and cc systems. Perturbative corrections to oscillator energy levels due to inclusion of short range a/r effect are also obtained.