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The response of a scintillation detector with a cylindrical 1.5-in. LaBr 3 :Ce crystal to incident neutrons has been measured in the energy range E n = 2–12 MeV. Neutrons were produced by proton irradiation of a Li target at E p = 5–14.6 MeV with pulsed proton beams. Using the time-of-flight information between target and detector, energy spectra of the LaBr 3 :Ce detector resulting from fast neutron interactions have been obtained at 4 different neutron energies. Neutron-induced γ rays emitted by the LaBr 3 :Ce crystal were also measured in a nearby Ge detector at the lowest proton beam energy. In addition, we obtained data for neutron irradiation of a large-volume high-purity Ge detector and of a NE-213 liquid scintillator detector, both serving as monitor detectors in the experiment. Monte-Carlo type simulations for neutron interactions in the liquid scintillator, the Ge and LaBr 3 :Ce crystals have been performed and compared with measured data. Good agreement being obtained with the data, we present the results of simulations to predict the response of LaBr 3 :Ce detectors for a range of crystal sizes to neutron irradiation in the energy range E n = 0.5–10 MeV. [ABSTRACT FROM AUTHOR]

A new β -decay station, COnversion electrons Chasing at Orsay (COeCO), has been developed at ALTO to perform conversion electron spectroscopy studies of neutron-rich nuclei produced by photo-fission of a uranium carbide target. It is based on the collection of a low-energy ISOL beam on a mylar tape, and the transportation of the electrons emitted by the produced radioactive source through a magnetic field induced by two copper coils, towards a cooled Si(Li) detector. In this article, a detailed description of the new decay station and its components is given. The magnetic field induced by the coils was measured and compared to simulations performed with the COMSOL ® software. The efficiency of the detection setup was estimated using a 207Bi and a 152Eu source as an off-line commissioning. Finally, the results obtained with a 96Rb radioactive beam for the on-line commissioning are presented. [ABSTRACT FROM AUTHOR]

Gamma-ray angular distributions for the resonances at Ep=550 and 1747 keV of the radiative capture reaction 13C(p,γ)14N have been measured, using intense proton beams on isotopically pure 13C targets. Experimental gamma-ray spectra were obtained with three HP–Germanium detectors at four angles for Ep=550 keV and six angles for Ep=1747 keV in the range of 0–90° with respect to the proton beam. From the data, relative intensities for the strongest transitions were extracted with an accuracy of typically 5%, making these resonances new useful gamma-ray standards for efficiency calibration in the energy range from Eγ=1.6–9 MeV. Gamma-ray branching ratios were obtained for several levels of 14N and are compared with literature values. [Copyright &y& Elsevier]