Mergers of double neutron stars are considered the most likely progenitors for short gamma-ray bursts. Indeed such a merger can produce a black hole with a transient accreting torus of nuclear matter (Lee & Ramirez-Ruiz 2007, Oechslin & Janka 2006), and the conversion of a fraction of the torus mass-energy to radiation can power a gamma-ray burst (Nakar 2006). Using available binary pulsar obse...

Accurate partial gamma-ray production cross sections were determined for the prompt and radioactive product decay gamma rays following cold neutron capture in Tc. They can be used for non-destructive assay of technetium by prompt gamma activation analysis (PGAA) and neutron activation analysis (NAA), offering orders of magnitude higher analytical sensitivities than passive gamma-ray counting. A...

Organic scintillators doped with capture agents provide a detectable signal for neutrons over broad energy range. This work characterizes the fast and slow neutron response of EJ-254, an organic plastic scintillator 5% natural boron loading by weight. For neutrons, primary mechanism light generation in is n-p elastic scattering. To study response, proton yield EJ-254 was measured at 88-Inch Cyc...

Radiation therapy has made marked progress following introduction of high energy xray, gamma ray and electron accelerators . Neverthe l ess, the fact that the doses delivered to the target volume depend on radiation tolerance of the normal tissues still remaims critical problems. At National Institute of Radiological Sciences ( NIRS ), medical cyclotron was installed on 1973 and the clinical tr...

Binary neutron star mergers are expected to produce fast dynamical ejecta, with mildly relativistic velocities extending $\beta=v/c>0.6$. We consider the radio X-ray synchrotron emission produced by collisionless shocks driven such ejecta into interstellar medium. Analytic expressions given for spherical broken power-law mass (or energy) distributions, $M(>\gamma\beta)\propto(\gamma\beta)^{-s}$...

The CITATION code based on neutron diffusion theory is used for flux calculation inside voluminous sample in prompt gamma activation analysis with an isotopic neutron source (241Am–Be). The code used the specific parameters related to energy spectrum source, irradiation system materials (shielding, reflector, etc.), geometry and elemental composition of the sample. The flux distribution (therma...

We measured in situ the radiation-induced absorption of pure silica core fibers exposed to a fission nuclear radiation. We observed the growth of the 1.38m OH vibration band in polymer coated fiber. Two contributions, a gamma-induced hydrogen diffusion and the recoil protons, are compared. The major contribution to the OH content growth is identified to originate from the gamma-induced hydrogen...

For an unsteady baryonic gamma-ray burst (GRB) outflow, the fast and slow proton shells collide with each other and produce energetic soft gamma-ray emission. If the outflow has a significant neutron component, the ultrarelativistic neutrons initially expand freely until decaying at a larger radius. The latetime proton shells ejected from the GRB central engine, after powering the regular inter...