Fission of Elements from Pt to Bi by High Energy Neutrons

Measurements of neutron-induced fission cross sections forBi209,Pbnat,PbSmirnov1, Eismont2, Filatov3 et al. 2004Phys. Rev. C21180View full textAdd to dashboardCite

“…The early experiments of Kelly and Wiegand [10], Goldanskiy et al [11], Reut et al [12], and Dzhelepov et al [13] are rather of a qualitative character. The studies of Vorotnikov and Larionov [14] and Vorotnikov [15] are of a high methodological quality, but cover only a narrow energy region near the fission barrier, where the cross sections are extremely small, and therefore only upper limits for cross sections could be obtained in many cases.…”

Réalisation et étude d'une chambre à fissioà bismuth, détecteur de neutrons de grande énergie

“…Les electrodes port6es a la haute tension (fig. 2) sont couvertes par des couches de bismuth. Le parcours moyen des fragments de fission dans Bi est 6gal a 4,3 mg,lcm2 [14] et nous avons choisi une 6paisseur pour chaque couche de 0,64 mg/cm2.…”

“…Introduetion. -On sait que les noyaux de Bi bombardés par des particules de tres grande energie peuvent subir la fission, [1,2,3]. Ce processus a 6t6 utilise pour détecter des neutrons d'une energie sup6rieure a 50 MeV [4,5,6,7] a I'aide de chambres d'ionisation a impulsions comportant des electrodes recouvertes de bismuth.…”

Stray Radiation Measurements at Particle Accelerator Sites

“…(-^U A detector which will respond only to neutrons above a certain energy, by any of several mechanisms, is known as a threshold detector. For example, a chamber employing material such as U^^^ or 31^09 (31,32,33) js useful as a detector of neutrons produced by the fission process with energies above 1,1 and 60 Mev, respectively. The S^^ isotope has value as a threshold detector by virtue of the (n,p) reaction which occurs above neutron energies of about 1 Mev.V^^) Nuclear Track Film.…”