We obtain new stringent constraints on a light spinless particle φ coupled only to photons at low energies, considering its effects on the extragalactic photon background, the blackbody spectrum of the CMBR and the cosmological abundance of deuterium.

We present 12 C+ C direct fusion measurements with STELLA UKFATIMA, that reach into the region of astrophysics interest relevant to massive stars ( M ⊙ ≈ 25) using self-supporting thin rotating carbon foils [1]. demonstrate detecting gammas and light charged particles in coincidence nanosecond timing is key for effective background reduction achieving reliable sub-nanobarn range. give details a...

Models for the evolution of the integrated energy spectrum of primary cosmic ray electrons in clusters of galaxies have been calculated, including the effects of losses due to inverse Compton (IC), synchrotron, and bremsstrahlung emission, and Coulomb losses to the intracluster medium (ICM). The combined time scale for these losses reaches a maximum of ∼3×109 yr for electrons with a Lorentz fac...