A position-sensitive γ-ray detector for positron annihilation 2D-ACAR based on metal package photomultiplier tubes

Koji Inoue, Haruo Saito, Yasuyuki Nagashima, Toshio Hyodo, Yasuyoshi Nagai, Shinichi Muramatsu, Shota Nagai, Keisuke Masuda

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A new position-sensitive γ-ray detector to be used in a two-dimensional angular correlation of positron annihilation radiation (2D-ACAR) apparatus has been developed. It consists of 36 compact position-sensitive photomultiplier tubes (PS-PMT: HAMAMATSU R5900-00-C8), a light guide, and 2676 Bi4Ge3O12 (BGO) scintillator pieces of size 2.6 mm × 2.6 mm × 18 mm. A high detection efficiency for 511 keV γ-ray is achieved with the length of BGO scintillators used. The detection area is about 160 mm × 160 mm. The 288 anode outputs of the PS-PMTs are wired and connected to resistor chains from which 16 outputs (8 outputs each along the X and Y directions) are taken to identify the incident position of the γ-ray. The spatial resolution is about 3 mm (FWHM). The timing signal taken from the last dynodes of the PS-PMTs gives a timing resolution of 7.7 ns (FWHM) for 511 keV positron annihilation γ-rays.

Original languageEnglish
Pages (from-to)471-476
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume487
Issue number3
DOIs
Publication statusPublished - 2002 Jul 21
Externally publishedYes

Keywords

  • 2D-ACAR
  • BGO array
  • Position-sensitive photomultiplier tube
  • Positron annihilation
  • γ-ray detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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