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Journal ArticleDOI

A modular NaI(Tl) detector for 20–1000 MeV photons☆

01 Aug 1983-Nuclear Instruments and Methods in Physics Research (North-Holland)-Vol. 213, Iss: 2, pp 251-259

AbstractA detector consisting of 54 NaI (Tl) modules is described. The detector has been optimized for the detection of 20–1000 MeV photons. An energy resolution (fwhm) of 5.5% at 130 MeV could be attained, and the stability has been better than 1% over several months.

Topics: Detector (52%) more

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Abstract: Proton-antiproton annihilations at rest in liquid hydrogen were investigated through the inclusive γ spectrum, related to the annihilation. The high-energy part of the spectrum was used to deduce branching ratios for the so far unobserved annihilation channels: R( p p →π 0 ω) = (2.38 ± 0.65)% , R( p p → π 0 η) = (0.82 ± 0.10% , R p p →π 0γ) = (0.015 ± 0.007)% , and R( p p → π 0 π 0 = (0.06 ± 0.04)% . An upper limit for the π0η′ channel was deduced to be R( p p → π 0 η ′ ) .

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Journal ArticleDOI
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Journal ArticleDOI
Abstract: After having found evidence for narrow exotic states in p p annihilation, the production of such states on a nuclear target was studied with similar techniques. The γ spectrum associated with p annihilation on 4He at rest was measured. The spectrum shows two peaks, at energies of 161.9 and 203.0 MeV, corresponding to intermediate narrow states of masses which seem to be related to states found in p p annihilations. The confidence is better than 4σ.

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Abstract: A prototye NaI(Tl) detector (the Cluster of 54) of spherical geometry subtending a solid angle of 7.5% of 4? at its center, has recently been assembled and tested. This detector consisted of 54 close-packed but optically isolated NaI(Tl) modules and the associated electronic circuitry. The Cluster of 54 is the predecessor of an almost complete spherical detector, the Crystal Ball, which will cover 94% of 4?. The latter detector is now under construction and is especially designed for the study of ?-rays produced in electron-positron collisions at colliding beam facilities. This article will outline the mechanical, optical, and electronic assembly of the prototype system. Cluster of 54 test data will be presented.

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