Photon-induced positron annihilation lifetime spectroscopy using ultrashort laser-Compton-scattered gamma-ray pulses

Journal Article · Wed May 15 04:00:00 EDT 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4807701· OSTI ID:22118555

Taira, Y.; Toyokawa, H.; Kuroda, R. ^[1]; Yamamoto, N. ^[2]; Adachi, M.; Tanaka, S.; Katoh, M. ^[3]

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1. Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)
2. Nagoya University Synchrotron Radiation Research Center, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603 (Japan)
3. UVSOR, Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji-cho, Okazaki, Aichi 444-8585 (Japan)

High-energy ultrashort gamma-ray pulses can be generated via laser Compton scattering with 90 Degree-Sign collisions at the UVSOR-II electron storage ring. As an applied study of ultrashort gamma-ray pulses, a new photon-induced positron annihilation lifetime spectroscopy approach has been developed. Ultrashort gamma-ray pulses with a maximum energy of 6.6 MeV and pulse width of 2.2 ps created positrons throughout bulk lead via pair production. Annihilation gamma rays were detected by a BaF{sub 2} scintillator mounted on a photomultiplier tube. A positron lifetime spectrum was obtained by measuring the time difference between the RF frequency of the electron storage ring and the detection time of the annihilation gamma rays. We calculated the response of the BaF{sub 2} scintillator and the time jitter caused by the variation in the total path length of the ultrashort gamma-ray pulses, annihilation gamma rays, and scintillation light using a Monte Carlo simulation code. The positron lifetime for bulk lead was successfully measured.

• OSTI ID: 22118555
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 5 Vol. 84; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNIHILATION
BARIUM FLUORIDES
COLLISIONS
COMPTON EFFECT
COMPUTERIZED SIMULATION
DETECTION
ELECTRONS
GAMMA RADIATION
GAMMA SPECTRA
GAMMA SPECTROSCOPY
LASERS
LIFETIME
MONTE CARLO METHOD
PAIR PRODUCTION
PHOTOMULTIPLIERS
PHOTONS
POSITRONS
PULSES
SCINTILLATION COUNTERS
STORAGE RINGS