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Gamma-induced Positron Spectroscopy (GiPS) at a superconducting electron linear accelerator
- Source :
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 269:2623-2629
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- A new and unique setup for Positron Annihilation Spectroscopy has been established and optimized at the superconducting linear electron accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf (Germany). The intense, pulsed (26 MHz) photon source (bremsstrahlung with energies up to 16 MeV) is used to generate positrons by means of pair production throughout the entire sample volume. Due to the very short gamma bunches (< 5 ps temporal length), the facility for Gamma-induced Positron Spectroscopy (GiPS) is suitable for positron lifetime spectroscopy using the accelerator’s radiofrequency as time reference. Positron lifetime and Doppler broadening Spectroscopy are employed by a coincident measurement (Age–Momentum Correlation) of the time-of-arrival and energy of the annihilation photons which in turn significantly reduces the background of scattered photons resulting in spectra with high signal to background ratios. Simulations of the setup using the GEANT4 framework have been performed to yield optimum positron generation rates for various sample materials and improved background conditions.
- Subjects :
- Physics
Nuclear and High Energy Physics
Positron Lifetime Spectroscopy
Bremsstrahlung
Particle accelerator
law.invention
Positron annihilation spectroscopy
Nuclear physics
Positron
law
Annihilation radiation
Physics::Accelerator Physics
Atomic physics
Spectroscopy
Instrumentation
Doppler broadening
Subjects
Details
- ISSN :
- 0168583X
- Volume :
- 269
- Database :
- OpenAIRE
- Journal :
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- Accession number :
- edsair.doi...........6646bbf1aacafea9ed8db1537bb20b5c