ZZH coupling : A probe to the origin of EWSB ?
Choudhury, Debajyoti
2003-02-17
Search results
26 records were found.
Comment: 4 pages, 3 figures
Comment: 8 pages, 3 figures, 2 tables
Excited states in the nucleus 133Sb, populated in the fission of 235U induced by thermal neutrons were studied using the Lohengrin fission-fragment separator. A new 4191.8 keV level in 133Sb, populated in the decay of the 16.6 μs isomer, was observed. The level is interpreted as the 11/2+ member of the πg7/2 * core configuration, predicted by the shell model at 4095 keV. Levels corresponding to octupole excitation of the 132Sn core, identified previously in prompt-γ measurement, were now observed in the isomeric decay.
We present for the first time the concept of a seeded {\gamma} quantum
Free-Electron-Laser (QFEL) at 478 keV, which has very different properties
compared to a classical. The basic concept is to produce a highly brilliant
{\gamma} beam via SASE. To produce highly intense and coherent {\gamma} beam,
we intend to use a seeded FEL scheme. Important for the production of such a
{\gamma} beam are novel refractive {\gamma} -lenses for focusing and an
efficient monochromator, allowing to generate a very intense and coherent seed
beam. The energy of the {\gamma} beam is 478 keV, corresponding to a wavelength
in the sub-{\AA}ngstr{\o}m regime (1/38 {\AA}). To realize a coherent {\gamma}
beam at 478 keV, it is necessary to use a quantum FEL design. At such high
radiation energies a classical description of the {\gamma}-FEL becomes wrong.
Comment: 10 pages, 7 figures
When a rather cold electron bunch is transported during laser bubble
acceleration in a strongly focusing plasma channel with typical forces of 100
GeV/m, it will form partially ordered long electron cylinders due to the
relativistically longitudinal reduced repulsion between electrons, resulting in
a long-range pair correlation function, when reaching energies in the
laboratory above 0.5 GeV. During Compton back-scattering with a second laser,
injected opposite to the electron bunch, the electron bunch will be further
modulated with micro bunches and due to its ordered structure will reflect
coherently, M\"ossbauer-like, resulting in a \gamma free electron laser
(\gamma-FEL). Increasing the relativistic \gamma factor, the quantal regime
becomes more dominant. We discuss the scaling laws with \gamma.
Comment: 13 pages, 4 figures
