Determination of the First Townsend Coefficient in Pure Isobutane

Autor(es)

Lima, Iara B. ; Vivaldini, Tulio C. ; Goncalves, Josemary A. C. ; Botelho, Suzana ; Ridenti, Marco A. ; Fonte, Paulo ; Mangiarotti, Alessio ; Pascholati, Paulo R. ; Bueno Tobias, Carmen C. ; Vanin, VR

• Tipo de documento: Artigo Científico
• Fonte: XXXIII BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS; v. 1351, p. 5-pg., 2011-01-01.

Resumo

In this work studies of the first Townsend coefficient (alpha) behavior in isobutane for reduced electric fields ranging from 139Td up to 208Td are presented. Pure isobutane has been widely used in Resistive Plate Chambers (RPCs) and other gaseous detectors because of its excellent timing properties. Regardless of these characteristics, there is a lack of swarm parameters data in the literature for this gas. The measurements were based on the Pulsed Townsend technique. Considering the ratio between the current, measured in avalanche mode, and the primary ionization current, the first Townsend coefficient can be determined. In order to validate the technique, results for nitrogen are also presented. (AU)

• Processo FAPESP: 07/06773-0 - Medidas do coeficiente de multiplicação gasosa no isobutano puro
• Beneficiário: Iara Batista de Lima
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/06771-8 - Medidas de velocidade de arrastamento de elétrons no isobutano puro
• Beneficiário: Túlio Cearamicoli Vivaldini
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 02/04697-1 - Medidas de parâmetros de transporte de elétrons em gases em regime de multiplicação
• Beneficiário: Carmen Cecília Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Regular