1,721,071 research outputs found
Mesic molecules and muon catalysed fusion
No full textWe discuss the energy spectrum of mesic molecules, reviewing the recent advances in the methods of calculations and in the measurements of the energy levels. We also present recent ideas concerning the possibility of using the muon catalysed fusion for energy production. © 1982
Some aspects of the muon catalysis of d-t fusion
No full textWhen a deuteron, a triton and a muon are bound in a (dμt) mesomolecule the nuclear reaction d + t → 4He + n takes place in a very short time. In this paper the processes following the nuclear reaction are studied. The probability of the muon sticking to the α-particle is found to be w = (1.2 ± 0.1) × 10-2. All the processes which can strip the (μα) during the slowing down are taken into account. At the end of the slowing down the probability for the muon still to be bound to the α-particle is $ ̄w = 9.1 × 10-3. Consequently the maximum number of d-t fusions one muon can catalyse is Nmax = 1 w ̄ = 110. The yields of K and L (μα) lines are also calculated: K = 0.60 × 10-2, L = 0.59×10-3. © 1981
Coulomb de-excitation of mesic hydrogen
No full textSome aspects of the cascade of neutral exotic atoms are analysed. In particular the relevance of the Coulomb de-excitation-transitions induced by the Coulomb interaction with the surrounding atoms-is pointed out. Cross-sections and rates are calculated for μ-p and π-p atoms in hydrogen with energies ranging between 0.1 and 10 eV. The effect turns out to be dominant for n≳10 and for a large interval of pressure values. The consequence is a drastic shortening of the early stages of the cascade. When considered for π-p atoms, the effect provides a better agreement between the theoretical and experimental cascade times than that previously found. © 1978 Società Italiana di Fisica
On the Energy-loss of Very-slowly-moving Magnetic Monopoles
No full textWe investigate the energy loss of magnetic monopoles with β {less-than or approximate}10-4, arising from elastic collisions with hydrogen and helium atoms. At liquid hydrogen density, we find dE dx ∼ 50 MeV/cm. We discuss the relevance of this result for monopole searches. We find that monopoles with β ≤10-4 are stopped by the earth and by the moon, and we derive a bound on monopole flux: φ {less-than or approximate} 10-4 (m2 day sr)-1 for β ≤ 10-4. © 1984
Uso del Fattore di crescita nervoso (NGF)per l'espansione in vitro di cellule staminali del cordone ombelicale
No full textBounds On Long-range Hadronic-interactions
No full textBounds on long-range nucleon-nucleon interactions are obtained from the analysis of gravitational experiments, molecular spectroscopy and low and intermediate energy nuclear phenomena. Previously existing results are improved, and rather general types of potentials are considered: potentials behaving as 1/Rn and potentials corresponding to the exchange of scalar and pseudo-scalar particles. © 1983
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
