We report experimental evidence for the loss of neutral C, C2, C3, and C4 from photoexcited c60 and C70. These species are detected by postionization with XUV radiation formed by four-wave mixing in Kr vapor. The fragments have been detected in the nascent distribution (i.e., before total disintegration of the fullerene-size molecular entities). A resonant autoionization transition in C atom ha...

In this project, we began with a serial plus OpenMP implementation of a multigrid method to solve Poisson’s equation in three dimensions. Our main goal was to parallelize this method using data-level parallelism and MPI. To this end, our primary goal was to extend the work of previous students by handling two and three dimensional data divisions. Beyond that, we sought to implement the fastest ...

Objective: Different categories are available for estimating of radiation dose. Radioisotopes with the same energy and almost the same physical properties have similar effects. Monte Carlo technique is a computerized method based on mathematical simulation of physical processes. The main purpose of this study is to show that beta particles are not able to penetrate deep into the water. also dif...

Neutron coincidence counting is a technique widely used for qualitative and quantitative analysis of nuclear material. Because different isotopes possess different coincident neutron characteristics, the coincident neutron signature can be used to identify and quantify a given material. In an effort to identify unknown nuclear samples in field inspections, a new portable neutron coincidence cou...

Structural properties of materials irradiated with gamma-rays, such as mechanical and physical properties, may be modified or reduced depending on the displacement damages. Apart from increasing decreasing that property, damage desirable not. This study investigates effects sterilization by gamma radiation polycaprolactone (PCL) scaffolds. Using a code-based simulation method, MCNPX provides in...

A novel simulation to calculate the neutronic parameters of TRIGA 2000 reactor using plate-type fuel has been performed. The plate used was produced by Indonesian Nuclear Industry (PT INUKI) with U3Si2-Al material. Neutronic based on INUKI’s dimension and current TRIGA’s configuration were simulated MCNPX. performed modeling complete reactor’s a fresh core state. We obtained kinetic parameter v...

radiotherapy dose calculations can be evaluated by monte carlo (mc) simulations with acceptable accuracy for dose prediction in complicated treatment plans. in this work, standard, livermore and penelope electromagnetic (em) physics packages of geant4 application for tomographic emission (gate) 6.1 were compared versus monte carlo n-particle extended (mcnpx) 2.6 in simulation of 6 mv photon lin...