Measuring neutron-induced fission cross-section of shortlived actinides using a lead neutron-slowing-down spectrometer

Granier, T.; Pangault, L N; Ethvignot, T.; Haight, R. C.; Ledoux, X.; Méot, V.; Patin, Y.; Pras, P.; Szmigiel, M.; Rundberg, R. S.; Wilhelmy, J.B.

doi:10.1016/s0168-9002(03)01373-1

Cited by 12 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This procedure is suitable for an accurate determination of the resolving power of spectrometers consisting of heavy nuclei, e.g. the resolving power of the lead spectrometers that have recently attracted renewed interest [12][13][14].…”

Section: Slowing Down In a Moderator Containing Only Heavy Nucleimentioning

confidence: 99%

“…Formula (3.63) is referred to in the recent publications [12][13][14] on lead neutron spectrometers. Before starting a more detailed discussion on the slowing down process in moderators consisting of heavy nuclei, it will be of some interest to investigate more thoroughly the error of the Lamarsh formula.…”

Section: Heuristic Considerationsmentioning

confidence: 99%

“…The prototype of the lead neutron-spectrometer was tested by F L Shapiro and M Kazarnovsky and their co-workers [11] already before 1955 and their results were published in the First International Conference on the 'Peaceful Use of Nuclear Energy' in Geneva, 1955. From the articles [12][13][14] about the new applications, it turned out-in a surprisingly interesting way-that the spectrometer mathematics based on the old heuristic considerations have still been used. This fact convinced me that it is reasonable to publish my old unpublished calculations concerning the stochastic theory of the slowing down of neutrons'.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stochastic aspects of neutron slowing down processes

Пал¹,

Pázsit²

2010

Phys. Scr.

View full text Add to dashboard Cite

This paper presents a review of all the aspects of slowing down phenomena in which stochastic considerations of the process need to be taken into account. The cases both with and without absorption are treated. A consistent treatment is given of the energy distribution functions, the moments of collisions to slow down past a certain energy, the speed of neutrons and the slowing down time, with explicit expressions for the expectation and variance in all cases. Besides a compact and uniform derivation of known results, some new results are also presented.

show abstract

Section: Slowing Down In a Moderator Containing Only Heavy Nucleimentioning

confidence: 99%

Section: Heuristic Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stochastic aspects of neutron slowing down processes

Пал¹,

Pázsit²

2010

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…The lead slowing-down spectrometer [2] (LSDS), operated in Target-2, is an instrument that down scatters a large pulse of neutrons produced by the PSR beam which strikes a tungsten target inside a 1.7 cubic meter lead structure. Because lead is a heavy nucleus with a low capture cross section, the neutrons within the LSDS attain an average energy distribution with roughly a 30% energy spread that varies inversely as the square of the time after proton beam arrival.…”

Section: Wnr Research Program and Selected Accomplishmentsmentioning

confidence: 99%

Basic and Applied Science Research at the Los Alamos Neutron Science Center

Lisowski¹

2005

AIP Conference Proceedings

View full text Add to dashboard Cite

The Los Alamos Neutron Science Center, or LANSCE, is an accelerator-based national user facility for research in basic and applied science using four experimental areas. LANSCE has two areas that provide neutrons generated by the 800-MeV proton beam striking tungsten target systems. A third area uses the proton beam for radiography. The fourth area uses 100 MeV protons to produce medical radioisotopes. This paper describes the four LANSCE experimental areas, gives nuclear science highlights of the past operating period, and discusses plans for the future.

show abstract

“…To compensate for low count rates for measurements with conventional time-of-flight techniques on small quantities of actinides with short half-lives, a very high neutron flux is needed. In this goal, a Lead Slowing-Down Spectrometer is being developed at LANSCE [1]. An interesting example of a short-lived isomer is the first isomer of uranium 235 with a half-life of 26 min.…”

Section: Introductionmentioning

confidence: 99%

First Measurements with a Lead Slowing-Down Spectrometer at LANSCE

Rochman¹,

Haight²,

Wender³

et al. 2005

AIP Conference Proceedings

View full text Add to dashboard Cite

The characteristics of a Lead Slowing-Down Spectrometer (LSDS) installed at the Los Alamos Neutron Science Center (LANSCE) are presented in this paper. This instrument is designed to study neutron-induced fission on ultra small quantities of actinides, on the order of tens of nanograms or less. The measurements of the energy-time relation, energy resolution and neutron flux are compared to simulations performed with MCNPX. Results on neutroninduced fission of 235 U and 239 Pu with tens of micrograms and tens of nanograms, respectively, are presented. Finally, a digital filter designed to improve the detection of fission events at short time after the proton pulses is described.

show abstract

Measuring neutron-induced fission cross-section of shortlived actinides using a lead neutron-slowing-down spectrometer

Cited by 12 publications

References 15 publications

Stochastic aspects of neutron slowing down processes

Stochastic aspects of neutron slowing down processes

Basic and Applied Science Research at the Los Alamos Neutron Science Center

First Measurements with a Lead Slowing-Down Spectrometer at LANSCE

Contact Info

Product

Resources

About