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Chin M.P.W.,4004 Wesbrook Mall
Journal of Radioanalytical and Nuclear Chemistry | Year: 2015

This work introduces FTREE, which describes radiation cascades following impingement of a source particle on matter. The ensuing radiation field is characterised interaction by interaction, accounting for each generation of secondaries recursively. Each progeny is uniquely differentiated and catalogued into a family tree; the kinship is identified without ambiguity. This mode of observation, analysis and presentation goes beyond present-day detector technologies, beyond conventional Monte Carlo simulations and beyond standard pedagogy. It is able to observe rare events far out in the Gaussian tail which would have been lost in averaging—events less probable, but no less correct in physics. © 2015 Akadémiai Kiadó, Budapest, Hungary Source

Romero-Redondo C.,4004 Wesbrook Mall | Navratil P.,4004 Wesbrook Mall | Navratil P.,Lawrence Livermore National Laboratory | Quaglioni S.,4004 Wesbrook Mall
AIP Conference Proceedings | Year: 2013

In this work we briefly outline the extension of the ab initio no-core shell model/Resonating group method (NCSM/RGM) to three-body cluster states. We present the results for 6He ground state within a 4He+n+n cluster basis under this approach. © 2013 AIP Publishing LLC. Source

Prelovsek S.,Jozef Stefan Institute | Draper T.,University of Kentucky | Lang C.B.,University of Graz | Limmer M.,University of Graz | And 3 more authors.
Proceedings of 24th International Symposium on Lepton-Photon Interactions at High Energy, LP 2009 | Year: 2010

We address the question whether the lightest scalar mesons σ and κraquarks. We present a search for possible light tetraquark states with JPC = 0++ and I = 0, 1/2, 3/2, 2 in the dynamical and the quenched lattice simulations using tetraquark interpolators. In all the channels, we unavoidably find lowest scattering states π (k) π (-k) or K(k) π (-k) with back-to-back momentum k = 0, 2 π /L,. However, we find an additional light state in the I = 0 and I = 1/2 channels, which may be related to the observed resonancesπ and π with a strong tetraquark component. In the exotic repulsive channels I = 2 and I = 3/2, where no resonance is observed, we find no light state in addition to the scattering states. Source

Egilmez M.,American University of Sharjah | Chow K.H.,University of Alberta | Macfarlane W.A.,University of British Columbia | Salman Z.,Laboratory for Muon Spin Spectroscopy | And 8 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2015

The local magnetic properties of Tm12Co 5Bi were investigated using muon spin relaxation (μSR), showing unusual magnetic features. Below 0.27 T, any magnetic transition in the sample occurs below ∼ 3 K while at 2.7 and 5 T, there is a magnetic transition in the range 10–30 K. These results constitute a possibility of a phase transition from an antiferromagnetic ground state to a short-ranged magnetic phase at the local level. © 2015 Springer Science+Business Media New York Source

Michan J.M.,4004 Wesbrook Mall | Polovy G.,University of British Columbia | Madison K.W.,University of British Columbia | Fujiwara M.C.,4004 Wesbrook Mall | Momose T.,University of British Columbia
Hyperfine Interactions | Year: 2015

We describe the design and performance of a solid-state pulsed source of narrowband (< 100 MHz) Lyman-α radiation designed for the purpose of laser cooling magnetically trapped antihydrogen. Our source utilizes an injection seeded Ti:Sapphire amplifier cavity to generate intense radiation at 729.4 nm, which is then sent through a frequency doubling stage and a frequency tripling stage to generate 121.56 nm light. Although the pulse energy at 121.56 nm is currently limited to 12 nJ with a repetition rate of 10 Hz, we expect to obtain greater than 0.1 μJ per pulse at 10 Hz by further optimizing the alignment of the pulse amplifier and the efficiency of the frequency tripling stage. Such a power will be sufficient for cooling a trapped antihydrogen atom from 500 mK to 20mK. © 2015 Springer International Publishing Switzerland Source

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