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

Toufen, D. L. ; Allegro, P. R. P. ; Medina, N. H. ; Oliveira, J. R. B. ; Cybulska, E. W. ; Seale, W. A. ; Linares, R. ; Silveira, M. A. G. ; Ribas, R. V.

Review of scientific instruments, 2014-07, Vol.85 (7), p.073501-073501 [Periódico revisado por pares]

United States: American Institute of Physics

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Título:
A system to measure isomeric state half-lives in the 10 ns to 10 μs range
Autor: Toufen, D. L. ; Allegro, P. R. P. ; Medina, N. H. ; Oliveira, J. R. B. ; Cybulska, E. W. ; Seale, W. A. ; Linares, R. ; Silveira, M. A. G. ; Ribas, R. V.
Assuntos: COINCIDENCE METHODS ; COMPTON EFFECT ; FLUORINE 19 ; GAMMA DETECTION ; HALF-LIFE ; HIGH-PURITY GE DETECTORS ; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ; IRON 54 ; Iron isotopes ; ISOMERIC NUCLEI ; KEV RANGE ; LEAD ; NAI DETECTORS ; Nuclear fusion ; Nuclear reactions ; PELLETRON ACCELERATORS ; Rangefinding ; Recoil ; RECOILS ; Scientific apparatus & instruments ; SHIELDS ; TANDEM ELECTROSTATIC ACCELERATORS ; TELESCOPES ; THERMONUCLEAR REACTIONS
É parte de: Review of scientific instruments, 2014-07, Vol.85 (7), p.073501-073501
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: 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 γ-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 São Paulo with the measurement of two known isomeric states: 54Fe, 10+ state (E = 6527.1 (11) keV, T1/2 = 364(7) ns) and the 5/2+ state of 19F (E = 197.143 (4) keV, T1/2 = 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 γ-γ coincidence method. The measured half-life for the 10+ state was T1/2 = 365(14) ns and for the 5/2+ state, 100(36) ns.
Editor: United States: American Institute of Physics
Idioma: Inglês

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

Toufen, D. L. ; Allegro, P. R. P. ; Medina, N. H. ; Oliveira, J. R. B. ; Cybulska, E. W. ; Seale, W. A. ; Linares, R. ; Silveira, M. A. G. ; Ribas, R. V.

United States: American Institute of Physics

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