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.
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July 2014
Research Article|
July 14 2014
A system to measure isomeric state half-lives in the 10 ns to 10 μs range
D. L. Toufen;
D. L. Toufen
a)
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
2
Federal Institute of Education
, Science and Technology of São Paulo - IFSP, 07115-000 Guarulhos, São Paulo, Brazil
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P. R. P. Allegro;
P. R. P. Allegro
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
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N. H. Medina;
N. H. Medina
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
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J. R. B. Oliveira;
J. R. B. Oliveira
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
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E. W. Cybulska;
E. W. Cybulska
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
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W. A. Seale;
W. A. Seale
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
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R. Linares;
R. Linares
3
Fluminense Federal University
, 24220-900 Niterói, Rio de Janeiro, Brazil
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M. A. G. Silveira;
M. A. G. Silveira
4
Universitary Center of FEI
, 09850-901 São Bernardo do Campo, São Paulo, Brazil
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R. V. Ribas
R. V. Ribas
1Institute of Physics,
University of São Paulo
, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
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Rev. Sci. Instrum. 85, 073501 (2014)
Article history
Received:
February 04 2014
Accepted:
June 23 2014
Citation
D. L. Toufen, P. R. P. Allegro, N. H. Medina, J. R. B. Oliveira, E. W. Cybulska, W. A. Seale, R. Linares, M. A. G. Silveira, R. V. Ribas; A system to measure isomeric state half-lives in the 10 ns to 10 μs range. Rev. Sci. Instrum. 1 July 2014; 85 (7): 073501. https://doi.org/10.1063/1.4886814
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