1,871 research outputs found
A fast-neutron spectrometer of advanced design
Fast neutron spectrometer combines helium filled proportional counters with solid-state detectors to achieve the properties of high efficiency, good resolution, rapid response, and effective gamma ray rejection
Finite Density of States in a Mixed State of d_x^2-y^2+id_xy Superconductor
We have calculated the density of states of quasiparticles in a
d_x^2-y^2+id_xy superconductor, and show that in the mixed state the
quasiparticle spectrum remains gapless because of the Doppler shift by
superflow. It was found that if the d_{xy} order gap
as suggested by experiments, then thermal conductivity in accord with experimental data at lowest temperatures. This is an
appended version of the paper published in Phys. Rev. {\bf B 59}, 6024, (1999).
We now also discuss the disorder effects and analyze the H log H crossover at
small fields. We argue that H log H regime is present and disorder effect is
dominant as the field-induced seconary gap is small at small fields.Comment: This is an appended version of the paper published in Phys. Rev. {\bf
B 59}, 6024, (1999). We now also discuss the disorder effects and analyze the
H log H crossover at small fields. 3 pages, Latex file with 2 eps figure
file
A fast neutron spectrometer of advanced design Final report, 1 May 1966 - 30 Jun. 1967
Helium 3 sandwich type fast neutron spectrometer desig
Fast-neutron spectrometer developments
Li6 sandwich-type neutron spectrometer is equipped with proportional counter for particle identification. System uses current-sensitive preamplifiers to minimize pile-up of gamma-ray and particle pulses
Influence of Resonances on the Noise Performance of SQUID Susceptometers
Scanning Superconducting Quantum Interference Device (SQUID) Susceptometry simultaneously images the local magnetic fields and susceptibilities above a sample with sub-micron spatial resolution. Further development of this technique requires a thorough understanding of the current, voltage, and flux ( IVΦ ) characteristics of scanning SQUID susceptometers. These sensors often have striking anomalies in their current–voltage characteristics, which we believe to be due to electromagnetic resonances. The effect of these resonances on the performance of these SQUIDs is unknown. To explore the origin and impact of the resonances, we develop a model that qualitatively reproduces the experimentally-determined IVΦ characteristics of our scanning SQUID susceptometers. We use this model to calculate the noise characteristics of SQUIDs of different designs. We find that the calculated ultimate flux noise is better in susceptometers with damping resistors that diminish the resonances than in susceptometers without damping resistors. Such calculations will enable the optimization of the signal-to-noise characteristics of scanning SQUID susceptometers
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