Results 21 to 30 of about 411,589 (180)
Ongoing Space Physics - Astrophysics Connections [PDF]
, 2005 I review several ongoing connections between space physics and astrophysics: a) Measurements of energetic particle spectra have confirmed theoretical prediction of the highest energy to which shocks can accelerate particles, and this has direct bearing on the origin of the highest energy cosmic rays.
arxiv +1 more source
Free Magnetic Energy in Solar Active Regions above the Minimum-Energy Relaxed State [PDF]
The Astrophysical Journal, 2007, Volume 669, Issue 1, pp. L53-L56, 2008 To understand the physics of solar flares, including the local reorganisation of the magnetic field and the acceleration of energetic particles, we have first to estimate the free magnetic energy available for such phenomena, which can be converted into kinetic and thermal energy.
arxiv +1 more source
Nuclear Astrophysics with Radioactive Beams [PDF]
Physics Reports:485 195(2010), 2009 The quest to comprehend how nuclear processes influence astrophysical phenomena is driving experimental and theoretical research programs worldwide. One of the main goals in nuclear astrophysics is to understand how energy is generated in stars, how elements are synthesized in stellar events and what the nature of neutron stars is.
arxiv +1 more source
Advanced Science, EarlyView.How do chemical and physical processes involving multiple phases develop on compact astrophysical objects such as white dwarf stars? Herein, entropy‐driven self‐assembly of rod‐shaped nanoparticles in centrifugal acceleration fields up to 7251 times the gravity of Earth is investigated, where strong acceleration fields accelerated the kinetics of phase
Lingyan Xu, Hongbo Zhao, Pei‐Xi Wang
wiley +1 more source
The Astrophysics of Ultrahigh Energy Cosmic Rays
, 2011 The origin of the highest energy cosmic rays is still unknown. The discovery of their sources will reveal the workings of the most energetic astrophysical accelerators in the universe.
Ahn HS +5 more
core +1 more source
Neutron Catalysis of Resonance Fusion in Stellar Matter [PDF]
, 2005 Within the framework of resonance fusion study in stellar matter the features of system consisted of two alpha particles and one neutron have been investigated at astrophysical energies. Consideration of three body scattering has been carried out on base of well-known Faddeev's equations.
arxiv +1 more source
A Macroscopic Description of a Generalized Self-Organized Criticality System: Astrophysical Applications [PDF]
2014, The Astrophpysical Journal 782, 54, 2013 We suggest a generalized definition of self-organized criticality (SOC) systems: SOC is a critical state of a nonlinear energy dissipation system that is slowly and continuously driven towards a critical value of a system-wide instability threshold, producing scale-free, fractal-diffusive, and intermittent avalanches with powerlaw-like size ...
arxiv +1 more source
Artificial Intelligence‐Assisted Target Design for High‐Intensity Laser‐Driven Neutron Sources
Advanced Intelligent Systems, EarlyView.This study presents an artificial intelligence (AI)‐assisted target design that combines particle‐in‐cell simulations with gradient ascent algorithm to optimize laser‐driven neutron sources. By enhancing the sheath electric field, the optimized structure increases neutron yield by a factor of 4,000.
Youjing Wang +7 more
wiley +1 more source
Fundamental Physics and Relativistic Laboratory Astrophysics with Extreme Power Lasers
, 2012 The prospects of using extreme relativistic laser-matter interactions for laboratory astrophysics are discussed. Laser-driven process simulation of matter dynamics at ultra-high energy density is proposed for the studies of astrophysical compact objects ...
Bulanov, S. V., Esirkepov, T. Zh.
core +1 more source
Introduction to nuclear astrophysics [PDF]
AIP Conf.Proc.1213:3-22,2010, 2009 In the first lecture of this volume, we will present the basic fundamental ideas regarding nuclear processes occurring in stars. We start from stellar observations, will then elaborate on some important quantum-mechanical phenomena governing nuclear reactions, continue with how nuclear reactions proceed in a hot stellar plasma and, finally, we will ...
arxiv +1 more source