Determinations of nuclear level halflives in 85Rb and 237Np and their use as timing standards

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Abstract

The application of nuclear lifetimes in the nonosecond range to the calibration of nuclear timing systems is discussed. More precise measurements of the lifetimes of the 517 keV level in 85Rb and the 60 keV level in 237Np are presented.

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Cited by (20)

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    The value is the weighted average of 5 measurements, the most recent of which is from 1972. The value obtained in this study does not agree with the stated average value, which could be caused by the very low uncertainty of the 1972 measurement 68.3(2) ns (Miller et al., 1972). In the ENSDF evaluation (Bhat, 1992), the same 5 measurements were used, but the low uncertainty of the 1972 measurement by Miller et al. is increased to 0.7 ns (1%) by the evaluator.

  • Standardisation of <sup>85</sup>Sr with digital anticoincidence counting and half-life determination of the 514 keV level of <sup>85</sup>Rb

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    Apart from the determination of the activity, the flexibility of the new digitizer-based approach made it possible to measure the half-life of the 514 keV excited state of 85Rb along with the activity determination. The new value of (1020.2 ± 6.0) ns within its uncertainty is consistent with the recommendation of the Decay Data Evaluation Project (Bé et al., 2004): The currently accepted half-life of (1015 ± 1) ns is based on the measurement by Miller et al. (1972) who used a 100 MHz digital timing circuit in combination with a NaI scintillator for X-ray detection (start signal) and a plastic scintillator for gamma-ray detection (stop signal). In contrast to this, the present experiment utilised liquid scintillation counting to detect 85Sr decay events which represents a more efficient way to identify start signals than an external X-ray detector.

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  • Nuclear data sheets for A = 85

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Supported in part by the National Aeronautics and Space Administration and the National Science Foundatiom.

Gulf Oil Corporation Graduate Fellow.

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