Yields of Short-Lived Fission Products Produced by Thermal-Neutron Fission of Plutonium-239

Dickens, J.K.; McConnell, J.W.; Northcutt, K. J.

doi:10.13182/nse81-a21348

Cited by 16 publications

(4 citation statements)

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“…For this paper, we focus on the first method where fractional-independent or -cumulative fission yields are generally obtained by the analysis of growth and decay curves of daughters and parents in γ-ray spectroscopy. In the past, systematic studies by Livermore [6][7][8][9], Argonne [10][11][12], and Oak Ridge [13][14][15][16] groups provided FPY information for a large number of fissioning systems. While there are a number of energy-integral measurements of cumulative fission product yields (e.g., following β decay of the fission products themselves), particularly for thermal neutrons [14,17,18], data for higher-energy (E n >1 MeV) differential measurements of short-lived FPYs are incomplete or have substantial uncertainties due to the low-intensity of quasi-monoenergetic fast neutron sources and the short lifetimes of fission products far from the valley of stability.…”

Section: Fission Product-yield Measurementsmentioning

confidence: 99%

Toward short-lived and energy-dependent fission product yields from neutron-induced fission

et al. 2020

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Fission product yields (FPYs) are an important source of information that are used for basic and applied physics. They are essential observables to address questions relevant to nucleosynthesis in the cosmos that created the elements from iron to uranium, for example, in energy generating processes from fission recycling in binary neutron star mergers; resolving the reactor neutrino anomaly; decay heat release in nuclear reactors; and many national security applications. While new applications will require accurate energy-dependent FPY data over a broad set of incident neutron energies, the current evaluated FPY data files contain only three energy points: thermal, fast, and 14-MeV incident energies. Recent measurements using mono-energetic and pulsed neutron beams at the Triangle Universities Nuclear Laboratory (TUNL) tandem accelerator and employing a dual fission ionization chambers setup have produced self-consistent, high-precision data critical for testing fission models for the neutron-induced fission of the major actinide nuclei. This paper will present new campaign just beginning utilizing a RApid Belt-driven Irradiated Target Transfer System (RABITTS) to measure shorter-lived fission products and the time dependence of fission yields, expanding the measurements from cumulative towards independent fission yields.

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Section: Fission Product-yield Measurementsmentioning

confidence: 99%

Toward short-lived and energy-dependent fission product yields from neutron-induced fission

et al. 2020

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“…Fractional independent and cumulative yields were generally obtained by the analysis of growth and decay curves of parent/daughter systems and therefore the results do not depend directly on the γ-ray line intensities of the short-lived isotopes that are frequently not well known. The method has been applied to the thermal neutron induced fission of 229 Th [66,67], 239 Pu [68,69], 241 Pu [70], 245 Cm [71], and 249 Cf [72].…”

Section: Y-ray Spectroscopy Of Unseparated Mixturesmentioning

confidence: 99%

15 Fission Fragment Mass, Charge and Energy Distributions

1997

Experimental Techniques in Nuclear Physics

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“…Up to 28 CFY for fission products with half-lives up to 1100 sec in 239 Pu (n th , f) and 8 CFY for fission products with half-lives to 230 sec in 23S U(n th ,f) have been recently reported [19,20]. Using the rapid gamma ray method, however, the fission rate in a sample was limited to about 10® fissions/s during irradiation in order to avoid high dead-time loss in the post-irradiation counting.…”

Section: Introductionmentioning

confidence: 99%

Cumulative Fission Product Yields of Fast-neutron Fission of ²³²Th

Chung

Pan

1985

Radiochimica Acta

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Fission product yields in 13I Th(nf, f) / Rapid multi-scaling gamma spectroscopy IGe(Li) detector AbstractThe cumulative yields of 33 fission products in fast-neutron induced fission of 232 Th have been determined using direct gamma ray spectroscopic method. To obtain the absolute yields of fission products having half-lives ranging from 13 s to 32 days, a total of 66 multi-scaling gamma ray spectra with various irradiation and cooling periods were collected. Gamma rays and photopeak areas of interest were assigned to the fission products by their energies and half-lives. Fission product activities were evaluated from spectral data using growth and decay calculation, and fission yields were determined by normalizing the l40 Ba yield to the average value from reported data. Results of the cumulative fission yields, among which 22 were measured for the first time, are compared with previous measurements and with recommended yields in recent evaluations. The agreements and some discrepancies of the comparisons are discussed, with the odd-even pairing effect emphasized.

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Yields of Short-Lived Fission Products Produced by Thermal-Neutron Fission of Plutonium-239

Cited by 16 publications

References 0 publications

Toward short-lived and energy-dependent fission product yields from neutron-induced fission

Toward short-lived and energy-dependent fission product yields from neutron-induced fission

15 Fission Fragment Mass, Charge and Energy Distributions

Cumulative Fission Product Yields of Fast-neutron Fission of ²³²Th

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Yields of Short-Lived Fission Products Produced by Thermal-Neutron Fission of Plutonium-239

Cited by 16 publications

References 0 publications

Toward short-lived and energy-dependent fission product yields from neutron-induced fission

Toward short-lived and energy-dependent fission product yields from neutron-induced fission

15 Fission Fragment Mass, Charge and Energy Distributions

Cumulative Fission Product Yields of Fast-neutron Fission of 232Th

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Cumulative Fission Product Yields of Fast-neutron Fission of ²³²Th