High-energy gamma ray spectrometer for heavy-ion induced experiments

S. Kubono, M. H. Tanaka, H. Kawakami, K. Sueki, H. Miyatake, T. Nomura, K. Morita, M. Ishihara, S. Kato, C. Konno, A. Sakaguchi

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3 Citations (Scopus)


A gamma-ray detector system of large NaI(Tl) crystals has been constructed to investigated heavy ion reaction mechanisms and highly excited nuclear structure with heavy ion beams. The NaI(Tl) crystals have as a whole a cross section of hexagonal shape of 30 cm between the parallel sides and a length of 20 cm, and are composed of seven substructures based on a honeycomb shape. This is designed for detection of high energy gamma rays with high resolution, and also for use as an anti-Compton spectrometer for a Germanium detector. A good energy resolution of 2.7 (3.2)% fwhm was obtained for 22.3 MeV gamma rays with 18 (39)% detection effeciency of the full-energy-loss peak with anti-Compton mode (sum mode) operation of the trapezoidal NaI(Tl) crystals. Compton scattering background in a spectrum by a Ge detector was successfully reduced by about 60% in applying the trapezoidal NaI(Tl) crystals for Compton suppression. The performance of the spectrometer is discussed.

Original languageEnglish
Pages (from-to)74-80
Number of pages7
JournalNuclear Inst. and Methods in Physics Research, A
Issue number1
Publication statusPublished - Oct 1 1986
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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