15 research outputs found
(gamma,np) reactions in <sup>12</sup>C , <sup>6</sup>Li and <sup>3,4</sup>He
The emission of neutron-proton pairs is the most probable outcome of photon absorbtion in the energy region above the giant resonance at least up to the pion threshold, but little detailed information on the process has been obtained due to experimental difficulties. Two nucleon emission following photon absorbtion by a correlated pair is favoured
compared to direct knockout of a single nucleon, which is suppressed by the large momentum mismatch between the ingoing photon and a single outgoing fast nucleon. Studies of the (gamma,np) process seek firstly to obtain a quantitative
understanding of the photon interaction mechanism, and through this to open the door to investigations of nucleon
correlations in nuclei [1], information about which is long sought but not readily obtainable
Relativistic corrections in (gamma,N) knockout reactions
We develop a fully relativistic DWIA model for photonuclear reactions using
the relativistic mean field theory for the bound state and the Pauli reduction
of the scattering state which is calculated from a relativistic optical
potential. Results for the 12C(gamma,p) and 16O(gamma,p) differential cross
sections and photon asymmetries are displayed in a photon energy range between
60 and 257 MeV, and compared with nonrelativistic DWIA calculations. The
effects of the spinor distortion and of the effective momentum approximation
for the scattering state are discussed. The sensitivity of the model to
different prescriptions for the one-body current operator is investigated. The
off-shell ambiguities are large in (gamma,p) calculations, and even larger in
(gamma,n) knockout.Comment: LaTeX2e, 18 pages, and 6 figure
Micromachining using deep ion beam lithography
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms1301-4155-159NIMB
Deep ion beam lithography for micromachining applications
10.1117/12.280533Proceedings of SPIE - The International Society for Optical Engineering3183128-137PSIS
A high resolution beam scanning system for deep ion beam lithography
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms136-138385-389NIMB
Direct synthesis of L10-phase nanostructured CoPt thin films using dense plasma focus device operating in non-optimized focus mode
Materials Research Society Symposium Proceedings1250113-118MRSP
On the plume splitting of pulsed laser ablated Fe and Al plasmas
A time resolved imaging study of pulsed laser ablated Fe and Al plasma plumes with specific interest in the splitting of plumes into the slow and fast moving components as they expand through the background argon gas at different pressures is reported. The material ablation was achieved using a Q-switched Nd:YAG (yttrium aluminum garnet) laser operating at 532 nm with a pulse duration of ~ 8ns full width at half maximum and a fluence of 30 µJ.cm-2 at the target surface. Typical time resolved images with low magnification show that the splitting occurs at moderate background gas pressures (0.5 and 1.0 mbar for Fe, and 0.2 mbar for Al plasma plumes). The plume splitting did not occur for higher background gas pressures
Miniature plasma focus as a novel device for synthesis of soft magnetic FeCo thin films
10.1016/j.physleta.2009.12.037Physics Letters, Section A: General, Atomic and Solid State Physics37481043-1048PYLA