Nuclear Data Sheets for A = 238

Chukreev, F.E.; Makarenko, V. E.; Martin, M.J.

doi:10.1006/ndsh.2002.0017

Cited by 63 publications

(42 citation statements)

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“…These observed states are listed in Table 1. However, it had been assumed that the total width of each resonance was given by Γ = 1.05 Γ 0 + Γ 1 , which was not assumed by the nuclear data evaluators [12]. The influence of this assumption is examined in the discussion surrounding Table 4.…”

Section: Heil Et Al Observed Nrf Inmentioning

confidence: 99%

Transmission nuclear resonance fluorescence measurements of 238U in thick targets

Quiter

Ludewigt

Mozin

et al. 2011

Nuclear Instruments and Methods in Physics Research Section B:

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Transmission nuclear resonance fluorescence measurements were made on targets consisting of Pb and depleted U with total areal densities near 86 g/cm 2 . The 238 U content in the targets varied from 0 to 8.5% (atom fraction). The experiment demonstrates the capability of using transmission measurements as a non-destructive technique to identify and quantify the presence of an isotope in samples with thicknesses comparable to the average thickness of a nuclear fuel assembly. The experimental data also appear to demonstrate the process of notch refilling with a predictable intensity. Comparison of measured spectra to previous backscatter 238 U measurements indicates general agreement in observed excited states. Evidence of two new 238 U excited states and possibly a third state have also been observed.

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Section: Heil Et Al Observed Nrf Inmentioning

confidence: 99%

Transmission nuclear resonance fluorescence measurements of 238U in thick targets

Quiter

Ludewigt

Mozin

et al. 2011

Nuclear Instruments and Methods in Physics Research Section B:

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“…results in 238 Pu being in two excited states: E 1 = 44.051 keV and E 2 = 1028.542 keV, with probabilities of 41.1% and 44.8%, respectively [9,16]. For simplicity, we assume that the neutrino momentum is zero, and the beta particle possesses maximum kinetic energies of 1248 keV and 263 keV, for E 1 and E 2 , respectively [9].…”

Section: Theoretical Modelmentioning

confidence: 99%

Nuclear recoil spectroscopy of levitated particles

2018

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We propose a new method for the detection and characterization of nuclear decay processes. Specifically, we describe how nuclear decay recoil can be observed within small particles levitated in an optical trap with high positional resolution. Precise measurements of the magnitude of each recoil as well as their rate of occurrence can provide accurate information about the isotopic composition of a radioactive sample. We expect that this new technique for nuclear material characterization will be especially useful in the area of nuclear forensic analysis.

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“…The 1-sigma uncertainty in the intensity of the 44.915 keV peak alone is 1.951 % [107]. In order to make accurate ratio measurements of 242 Pu, it is desirable to know this intensity with less than 1 % uncertainty.…”

Section: Limitations In Nuclear Datamentioning

confidence: 99%

Development of Metallic Magnetic Calorimeters for Nuclear Safeguards Applications

Bates

2015

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Many nuclear safeguards applications could benefit from high-resolution gamma-ray spectroscopy achievable with metallic magnetic calorimeters. This dissertation covers the development of a system for these applications based on gamma-ray detectors developed at the University of Heidelberg. It demonstrates new calorimeters of this type, which achieved an energy resolution of 45.5 eV full-width at half-maximum at 59.54 keV, roughly ten times better than current state of the art high purity germanium detectors. This is the best energy resolution achieved with a gamma-ray metallic magnetic calorimeter at this energy to date. In addition to demonstrating a new benchmark in energy resolution, an experimental system for measuring samples with metallic magnetic calorimeters was constructed at Lawrence Livermore National Laboratory. This system achieved an energy resolution of 91.3 eV full-width at half-maximum at 59.54 keV under optimal conditions. Using this system it was possible to characterize the linearity of the response, the count-rate limitations, and the energy resolution as a function of temperature of the new calorimeter. With this characterization it was determined that it would be feasible to measure 242 Pu in a mixed isotope plutonium sample. A measurement of a mixed isotope plutonium sample was performed over the course of 12 days with a single two-pixel metallic magnetic calorimeter. The relative concentration of 242 Pu in comparison to other plutonium isotopes was determined by direct measurement to less than half a percent accuracy. This is comparable with the accuracy of the best-case scenario using traditional indirect methods. The ability to directly measure the relative concentration of 242 Pu in a sample could enable more accurate accounting and detection of indications of undeclared activities in nuclear safeguards, a better constraint on source material in forensic samples containing plutonium, and improvements in verification in a future plutonium disposition treaty.

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Nuclear Data Sheets for A = 238

Cited by 63 publications

References 0 publications

Transmission nuclear resonance fluorescence measurements of 238U in thick targets

Transmission nuclear resonance fluorescence measurements of 238U in thick targets

Nuclear recoil spectroscopy of levitated particles

Development of Metallic Magnetic Calorimeters for Nuclear Safeguards Applications

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