The ITER neutral beam test facility under construction in Padova will host two experimental devices: SPIDER, a 100 kV negative H/D RF source, and MITICA, a full scale, 1 MeV deuterium beam injector. Detection of fusion neutrons will be used as a means to resolve the horizontal beam intensity profile. The neutron detection system will be placed right behind the SPIDER beam dump, as close to the ...

A Monte Carlo simulation of primary protons and alpha particles interacting with the atmosphere has been performed using the GEANT4 code. Measured particle fluxes were used as input to the simulation. The simulated terrestrial cosmic ray flux was found to agree within a factor of two with the measured neutron flux over the energy range from 1 to 10,000 MeV and with the measured muon flux in the...

Neutron radiography has long been used in various scientific investigations and industrial applications that require thermal neutrons for characterization. Different kinds of sources such as radioactive sources, portable and accelerator based neutron generators and nuclear reactors can be used to provide thermal beam of neutrons suited for neutron radiography. Among the different varieties of n...

Since 1950’s there has been a growing interest of understanding the effects of cosmic ray radiation on the increase in average global temperature. Recent studies showed that galactic cosmic rays play a significant role in the formation of low cloud coverage and its consequent impact on the global temperature variation of the earth. A long-term measurement of the cosmic ray flux distribution at ...

The process of thermal neutron absorption in the coldworked Pd cathodes during electrolysis in NaOD/D2O solution under irradiation by Ultraweak Thermalized Neutron Field (UTNF) was studied. It was found that during deuterium loading the probability of thermal neutron absorption in a strained Pd is increased by a factor 8 compared to the unstrained (annealed) sample or sample where loading is no...

We report small-angle neutron-scattering (SANS) measurements of flux line properties near H(c2) in an ultrapure sample of niobium with weak pinning of flux in the bulk. These confirm in detail the Abrikosov picture of the flux line lattice to within 20 mK of the upper critical field line. However, it has recently been claimed [X. S. Ling et al., Phys. Rev. Lett. 86, 712 (2001)], on the basis of...

The composition of the outer 100 m of a neutron star sets the heat flux that flows outwards from the core. For an accreting neutron star in an X-ray transient, the thermal quiescent flux depends sensitively on the amount of hydrogen and helium remaining on the surface after an accretion outburst and on the composition of the underlying ashes of previous H/He burning. Because H/He has a higher t...