11310446
Measurements of an ablator-gas atomic mix in indirectly driven implosions at the National Ignition Facility.
We present the first results from an experimental campaign to measure the atomic ablator-gas mix in the deceleration phase of gas-filled capsule implosions on the National Ignition Facility. Plastic capsules containing CD layers were filled with tritium gas; as the reactants are initially separated, DT fusion yield provides a direct measure of the atomic mix of ablator into the hot spot gas. Capsules were imploded with x rays generated in hohlraums with peak radiation temperatures of ∼294  eV. While the TT fusion reaction probes conditions in the central part (core) of the implosion hot spot, the DT reaction probes a mixed region on the outer part of the hot spot near the ablator-hot-spot interface. Experimental data were used to develop and validate the atomic-mix model used in two-dimensional simulations.
118588757
Generalization of the Andersson-Otterlund-Stenlund model for description of slow particle yield in interactions of nuclei with photoemulsion nuclei
181813172
CHARACTERISTIC FUNCTIONS OF INCLUSIVE PROCESSES WITH THE PARTICIPATION OF LIGHT NUCLEI
4466026
Fuel gain exceeding unity in an inertially confined fusion implosion
Ignition is needed to make fusion energy a viable alternative energy source, but has yet to be achieved. A key step on the way to ignition is to have the energy generated through fusion reactions in an inertially confined fusion plasma exceed the amount of energy deposited into the deuterium–tritium fusion fuel and hotspot during the implosion process, resulting in a fuel gain greater than unity. Here we report the achievement of fusion fuel gains exceeding unity on the US National Ignition Facility using a ‘high-foot’ implosion method, which is a manipulation of the laser pulse shape in a way that reduces instability in the implosion. These experiments show an order-of-magnitude improvement in yield performance over past deuterium–tritium implosion experiments. We also see a significant contribution to the yield from α-particle self-heating and evidence for the ‘bootstrapping’ required to accelerate the deuterium–tritium fusion burn to eventually ‘run away’ and ignite.
15576012
Higgs boson production at the LHC: NNLO partonic cross sections through order $\epsilon$ and convolutions with splitting functions to N$^3$LO
We consider Higgs boson production at hadron colliders in the gluon fusion channel and compute higher order terms in the regularization parameter ǫ. In particular, the next-to-next-to-leading order cross section is evaluated including order ǫ terms. These results are used to compute all convolutions with the splitting functions entering the next-to-next-to-next-to-leading order cross section.
119359676
MONTE-CARLO SIMULATION OF EXCLUSIVE CHANNELS IN e + e ANNIHILATION AT LOW ENERGY
Software package for Monte-Carlo simulation of e + e exclusive annihilation channels written in the C++ language for Linux/Solaris platforms has been developed. It incorporates matrix elements for several mechanisms of multipion production in a model of consequent two and three-body resonance decays. Possible charge states of intermediate and nal particles are accounted automatically under the assumption of isospin conservation. Interference eects can be taken into acccount. Package structure allows adding new matrix elements written in a gauge-invariant form.
17701283
Large mass expansion in two-loop QCD corrections of paracharmonium decay
We calculate the two-loop QCD corrections to paracharmonium decays {eta}{sub c}{yields}{gamma}{gamma} and {eta}{sub c}{yields}gg involving light-by-light scattering diagrams with light quark loops. Artificial large mass expansion and convergence improvement techniques are used to evaluate these corrections. The obtained corrections to the decays {eta}{sub c}{yields}{gamma}{gamma} and {eta}{sub c}{yields}gg account for -1.25% and -0.73% of the leading order contribution, respectively.
16606377
Virtual three-loop corrections to Higgs boson production in gluon fusion for finite top quark mass
Abstract In this Letter we present the three-loop virtual corrections to the Higgs boson production in the gluon fusion channel where finite top quark mass effects are taken into account. We perform an asymptotic expansion and manage to evaluate five terms in the expansion parameter M H 2 / M t 2 . A good convergence is observed almost until M H ≈ 2 M t .