Search results for "Solid"
showing 10 items of 3575 documents
Implementation of theP¯ANDA Planar-GEM tracking detector in Monte Carlo simulations
2018
Abstract The P ¯ ANDA experiment at FAIR will be performed to investigate different aspects of hadron physics using anti-proton beams interacting with a fixed nuclear target. The experimental setup consists of a complex series of detector components covering a large solid angle. A detector with a gaseous active media equipped with gas electron multiplier (GEM) technique will be employed to measure tracks of charged particles at forward direction in order to achieve a high momentum resolution. In this work, a full setup of the GEM tracking detector has been implemented in the P ¯ ANDA Monte Carlo simulation package (PandaRoot) based on the current technical and conceptual design, and the exp…
Analytical solution for the solid angle subtended at any point by an ellipse via a point source radiation vector potential
2010
An axially symmetric radiation vector potential is derived for a spherically symmetric point source. This vector potential is used to derive a line integral for the solid angle subtended at a point source by a detector of arbitrary shape and location. An equivalent line integral given previously by Asvestas for optical applications is derived using this formulation. The line integral can be evaluated in closed form for important cases, and the analytical solution for the solid angle subtended by an ellipse at a general point is presented. The solution for the ellipse was obtained by considering sections of a right elliptic cone. The general solution for the ellipse requires the solution of …
The PANDA DIRC detectors
2020
Abstract The PANDA experiment at the future Facility for Antiproton and Ion Research (FAIR) will address fundamental questions of hadron physics with unprecedented precision. To reach this goal excellent Particle Identification (PID) is essential over a large range of particle momenta and solid angles. Most of the phase space will be covered by two innovative DIRC (Detection of Internally Reflected Cherenkov light) detectors. The Endcap Disc DIRC and Barrel DIRC will cover the polar angle range from 5 to 22°and 22 to 140°, respectively. Both detectors rely on high precision optical components, lifetime-enhanced Microchannel Plate PMTs (MCP-PMTs), and fast readout electronics.
Nuclear magnetic resonance at millitesla fields using a zero-field spectrometer
2016
We describe new analytical capabilities for nuclear magnetic resonance (NMR) experiments in which signal detection is performed with chemical resolution (via spin-spin J couplings) in the zero to ultra-low magnetic field region, below 1μT. Using magnetic fields in the 100μT to 1mT range, we demonstrate the implementation of conventional NMR pulse sequences with spin-species selectivity.
The three-spectrometer facility at the Mainz microtron MAMI
1998
Abstract A set-up of three high-resolution magnetic spectrometers, for simplicity named A, B and C, has been built as the central facility for the precise determination of double and triple coincidence cross sections of hadron knock-out and meson production through the scattering of electrons at the Mainz microtron MAMI. The spectrometers A and C with point-to-point optics in the dispersive plane and parallel-to-point optics in the non-dispersive plane have a solid angle of 28 msr and a momentum acceptance of 20 and 25%, respectively. They each consist of a quadrupole, a sextupole and two dipole magnets, reaching maximum momenta of 735 and 550 MeV/c, respectively. The spectrometer B has a s…
Semicontact three-body interaction for nuclear density functional theory
2015
International audience; To solve difficulties related to the use of nuclear density functional theory applied in its beyond-mean-field version, we introduce a semicontact three-body effective interaction. We show that this interaction is a good candidate to replace the widely used density-dependent effective interaction. The resulting new functionals are able to describe symmetric, neutron, polarized, and neutron polarized nuclear matter as well as the effective mass properties simultaneously.
Summary Report of the Workshop on Polarized Electron Sources and Electron Spin Polarimeters
1991
The workshop was a satellite meeting of the 9th International Symposium on High Energy Spin Physics, Bonn 1990. It was the third in a row of similar workshops organised by Ch.K. Sinclair in Stanford 1983 [1] and in Minneapolis 1988 [2]. About fourty scientists from atomic, solid state, as well as high energy particle physics participated in the meeting. The broad spectrum of different fields of physics represented resulted in lively discussions throughout the workshop. It is hoped that the tradition of bringing together physicists working with polarized electrons in so different research fields, started by Ch.K. Sinclair in the Stanford meeting 1983, will find its contivation in the satelli…
Challenges for solid state detectors tracking detectors in nuclear physics experiments at FAIR
2007
The compelling scientific goals of future nuclear physics experiments demand significant advances in detector technology. Nuclear physics opportunities at future facility FAIR have never been so bright, but the detector challenges must be met. With the essential questions concerning nuclear structure and dynamics, nuclear astrophysics, limits of nuclear stability, tests of fundamental interactions and symmetries all being realistic targets of studies of exotic nuclei, detector development efforts are strongly motivated. Several examples of developments for future fixed target experiments as well as experiments at storage ring are outlined.
Development of a laser ion source at IGISOL
2005
FURIOS, the Fast Universal laser IOn Source, is under development at the IGISOL (Ion Guide Isotope Separator On-Line) mass separator facility in Jyvaskyla, Finland. This new laser ion source will combine a state-of-the-art solid state laser system together with a dye laser system, for the selective and efficient production of exotic radioactive species without compromising the universality and fast release inherent in the IGISOL system. The motivation for, and development of, this ion source is discussed in relation to the programme of research ongoing at this mass separator facility.
Physics at the electron accelerator MAMI
1995
Abstract An overview of physics at the Mainz Microtron facility MAMI is given. After a short description of the essential parameters of the accelerator, selected results of three different collaborations A1, A2, and A3, each centered around one major experimental facility, are presented. The A1 collaboration has installed a setup of three large acceptance magnetic spectrometers. Results presented are high momentum components (pm ≤ 700MeV/c) in 16O(e, e′p), L T separation and LT interference structure functions in p(e, e′π+), and angular distribution of p(e, e′p)π0 at π0 threshold. The A2 collaboration has installed a broad band tagger for experiments with nonpolarized and polarized photons.…