DSAM for mean lifetime measurements in<sup>27</sup>Al following the (n, n' ) reaction

Elenkov, D.; Lefterov, D.; Toumbev, G.

doi:10.1088/0305-4616/8/7/016

Cited by 4 publications

(1 citation statement)

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“…The peaks at 844 keV, 1014 keV and 2211 keV are identified as transitions following the 27 Al(n,n γ) reac-tion. Since the 2212 keV level in 27 Al has a short mean life (26.6 fs [29]), the peak marked at 2211 keV is Doppler broadened [30] with a FWHM value of 15 keV. Due to the natural background radioactivity, the 214 Pb peak at 352 keV, the 214 Bi peaks at 1120 keV, 1238 keV, 1765 keV and the 40 K peak at 1461 keV are observed in this spectrum as a result of random coincidences.…”

Section: Identification Of Gamma-ray Peaksmentioning

confidence: 99%

Identification and rejection of scattered neutrons in AGATA

Şenyiğit

Ataç

Akkoyun

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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γ Rays and neutrons, emitted following spontaneous fission of 252Cf, were measured in an AGATA experiment performed at INFN Laboratori Nazionali di Legnaro in Italy. The setup consisted of four AGATA triple cluster detectors (12 36-fold segmented high-purity germanium crystals), placed at a distance of 50 cm from the source, and 16 HELENA BaF2 detectors. The aim of the experiment was to study the interaction of neutrons in the segmented high-purity germanium detectors of AGATA and to investigate the possibility to discriminate neutrons and γ rays with the γ-ray tracking technique. The BaF2 detectors were used for a time-of-flight measurement, which gave an independent discrimination of neutrons and γ rays and which was used to optimise the γ-ray tracking-based neutron rejection methods. It was found that standard γ-ray tracking, without any additional neutron rejection features, eliminates effectively most of the interaction points due to recoiling Ge nuclei after elastic scattering of neutrons. Standard tracking rejects also a significant amount of the events due to inelastic scattering of neutrons in the germanium crystals. Further enhancements of the neutron rejection was obtained by setting conditions on the following quantities, which were evaluated for each event by the tracking algorithm: energy of the first and second interaction point, difference in the calculated incoming direction of the γ ray, and figure-of-merit value. The experimental results of tracking with neutron rejection agree rather well with Geant4 simulations. © 2013 Elsevier B.V

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Section: Identification Of Gamma-ray Peaksmentioning

confidence: 99%