introduction: in recent decades, several monte carlo codes have been introduced for research and medical applications. these methods provide both accurate and detailed calculation of particle transport from linear accelerators. the main drawback of monte carlo techniques is the extremely long computing time that is required in order to obtain a dose distribution with good statistical accuracy. ...

Fully quantum and classical trajectory Monte Carlo calculations are performed for a Rydberg alkali atom that is kicked by a pulsed electric field. The two calculations are compared to recent experimental results through the ionization probability versus peak field strength. The energy distribution of the final electrons are compared between the two calculations. There is a qualitative differenc...

The effect of the statistical uncertainty, or noise, in inverse treatment planning for intensity modulated radiotherapy (IMRT) based on Monte Carlo dose calculation was studied. Sets of Monte Carlo beamlets were calculated to give uncertainties at Dmax ranging from 0.2% to 4% for a lung tumour plan. The weights of these beamlets were optimized using a previously described procedure based on a s...

We present an algorithm for the analytic continuation of imaginary-time quantum Monte Carlo data which is strictly based on principles of Bayesian statistical inference. Within this framework we are able to obtain an explicit expression for the calculation of a weighted average over possible energy spectra, which can be evaluated by standard Monte Carlo simulations, yielding as by-product also ...

background: for an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. the usual method to determine these factors is thermo luminescent dosimeter (tld) dosimetry. nowadays, another more accurate method is known to be the monte carlo ...

Charge-exchange cross sections in Be4+ + H(1s) collisions are calculated using the three-body classical trajectory Monte Carlo method (CTMC) and quasi-classical of Kirschbaum Wilets (QCTMC) for impact energies between 10 keV/amu 300 keV/amu. We present charge-exchange projectile n = 2 nl 2s, 2p states. Our results compared with previous quantum-mechanical approaches. found that QCTMC model is a...

We study the iteration of block spin transformations in the O(3) symmetric non-linear σ-model on a two-dimensional square lattice with help of the Monte Carlo method. In contrast to the classical Monte Carlo Renormalization Group approach, we do attempt to explicitly compute the block spin effective actions. Using two different methods for the determination of effective couplings, we study the ...

To reach the goal of prediction of electrochemical behavior from first principles, it appears increasingly evident that an intermediate stage, between ab initio calculation and Monte Carlo or classical molecular dynamics, will be required. Here we report progress on the development of such an intermediate computational method, using a self consistent tight binding approach, and report some prel...