A system to measure isomeric state half-lives in the 10 ns to 10 mu s range

Autor(es)

Toufen, D. L. ^{[1, 2]} ; Allegro, P. R. P. ^[1] ; Medina, N. H. ^[1] ; Oliveira, J. R. B. ^[1] ; Cybulska, E. W. ^[1] ; Seale, W. A. ^[1] ; Linares, R. ^[3] ; Silveira, M. A. G. ^[4] ; Ribas, R. V. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Phys, BR-05315970 Sao Paulo, SP - Brazil

^[2] Fed Inst Educ Sci & Technol Sao Paulo, BR-07115000 Guarulhos, SP - Brazil

^[3] Univ Fed Fluminense, BR-24220900 Niteroi, RJ - Brazil

^[4] Universitary Ctr FEI, BR-09850901 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Review of Scientific Instruments; v. 85, n. 7 JUL 2014.
• Citações Web of Science: 0

Resumo

The Isomeric State Measurement System (SISMEI) was developed to search for isomeric nuclear states produced by fusion-evaporation reactions. The SISMEI consists of 10 plastic phoswich telescopes, two lead shields, one NaI(Tl) scintillation detector, two Compton suppressed HPGe gamma-ray detectors, and a cone with a recoil product catcher. The new system was tested at the 8 UD Pelletron tandem accelerator of the University of Sao Paulo with the measurement of two known isomeric states: Fe-54, 10(+) state (E = 6527.1 (11) keV, T-1/2 = 364(7) ns) and the 5/2(+) state of F-19 (E = 197.143 (4) keV, T-1/2 = 89.3 (10) ns). The results indicate that the system is capable of identifying delayed transitions, of measuring isomeric state lifetimes, and of identifying the feeding transitions of the isomeric state through the delayed gamma-gamma coincidence method. The measured half-life for the 10(+) state was T-1/2 = 365(14) ns and for the 5/2(+) state, 100(36) ns. (C) 2014 AIP Publishing LLC. (AU)

• Processo FAPESP: 05/57440-6 - Estudo de estados isomerico.
• Beneficiário: Dennis Lozano Toufen
• Modalidade de apoio: Bolsas no Brasil - Mestrado