In the region of large μ+μ− invariant mass, the decay spectrum of KL → μ +μ−γ deviates from the Dalitz pair spectrum, as a result of interference between conversion (KL → γ ∗γ → μ+μ−γ) and bremsstrahlung amplitudes. The latter is proportional to the KL → μ +μ− matrix element, whose 2γ-absorptive part appears to dominate the observed KL → μ +μ− decay rate. We examine the extent to which a scruti...

Abstract. We report the results of extracting the hard X-ray continuum spectrum of Cas A SNR from RXTE/PCA Target of Opportunity observations (TOO) and CGRO/OSSE observations. The data can rule out the single thermal bremsstrahlung model for Cas A continuum between 2 and 150 keV. The single power law model gives a mediocre fit (∼5%) to the data with a power-law index, Γ = 2.94±0.02. A model wit...

Using our previous approach to electromagnetic emission during tunneling, an explicit , essentially classical, formula describing the bremsstrahlung spectrum in α decay is derived. The role of tunneling motion in photon emission is discussed. The shape of the spectrum is a universal function of the ratio E γ /E 0 , where E γ is the photon energy and E 0 is a characteristic energy depending only...

Coherent bremsstrahlung (CBS) is a specified type of radiation at colliders with short bunches. In the present paper we calculate the main characteristics of CBS for the BEPC collider. At this collider dN γ ∼ 3 · 10 8 dE γ /E γ photons of CBS will be emitted for a single collision of the beams in the energy range E γ < ∼ 240 eV. It seems that CBS can be a potential tool for optimizing collision...

We consider coherent electromagnetic processes for colliders with short bunches, in particular the coherent bremsstrahlung (CBS). CBS is the radiation of one bunch particles in the collective field of the oncoming bunch. It can be a potential tool for optimizing collisions and for measuring beam parameters. A new simple and transparent method to calculate CBS is presented based on the equivalen...