Cumulative yields of the heavy fragments in U235 thermal neutron fission

Farrar, H.; Tomlinson, R. H.

doi:10.1016/0029-5582(62)90227-4

Cited by 45 publications

(8 citation statements)

References 30 publications

(40 reference statements)

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“…Although 238 U and 244 Pu provide heavy Xe gases, including 129 Xe (Eikenberg et al., 1993; Lewis, 1975), 235 U does not produce 129 Xe. Although we did not determine U contents, we assumed the isotopic composition of fission Xe as 235 U‐derived Xe (Farrar & Tomlinson, 1962) and obtained the 129 Xe I+trap / 132 Xe ratio with minimum data reduction. After subtracting cosmogenic 134 Xe from measured 134 Xe, we obtained a fission Xe content by separating the remaining 134 Xe into trapped and fission components.…”

Section: Resultsmentioning

confidence: 99%

Multiple shock events recorded in the Northwest Africa 2139 LL6 chondrite: Implications for collisional histories of the LL chondrite parent body

Takenouchi

Sumino

Shimodate

et al. 2021

Meteorit & Planetary Scien

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LL chondrites have experienced multiple shock events; however, the relations of each shock event and their timing have rarely been investigated. To demonstrate the relations between each shock texture and shock chronological ages, we conducted both petrological and chronological (40Ar/39Ar and I‐Xe ages) studies using aliquots subsampled from the same chip of the Northwest Africa (NWA) 2139 LL6 chondrite. Our 40Ar/39Ar studies and petrological observation reveal that NWA 2139 recorded at least three impact events before 4.17 ± 0.10 Ga, thus resulting in a complex brecciated texture, silicate darkening, and thick shock veins. An intense heating event occurred at 4.17 ± 0.10 Ga, which recrystallized the thick veins and healing cracks. Then, a weak shock event occurred at <3.9 Ga. Combined with 40Ar/39Ar data of other LL chondritic materials, this study supports that the LL chondrite parent body was possibly broken up by 1.7 Ga, and that most of the breakup likely occurred within 3.8–4.2 Ga.

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Section: Resultsmentioning

confidence: 99%

Multiple shock events recorded in the Northwest Africa 2139 LL6 chondrite: Implications for collisional histories of the LL chondrite parent body

Takenouchi

Sumino

Shimodate

et al. 2021

Meteorit & Planetary Scien

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“…For comparison, the results from the GEF 2021/1.1 model [26] are plotted on the left panels by the blue solid step lines. The experimental data [15][16][17][18][19][20][21][22][23][24][25] from the EXFOR library are denoted by different symbols as indicated in Fig. 5.…”

Section: From Pre-to Post-neutron Emission Fpymentioning

confidence: 99%

“…We thus make assumptions for the probability in three different ways based on the experimental neutron multiplicity data. The POST-FPYs calculated by using the assumptions are compared with the POST-FPYs from the experimental data [15][16][17][18][19][20][21][22][23][24][25], the ENDF/B-VII.1 [1], and the GEF [26]. It is shown that the PRE-and POST-FPYs calculated by using the assumptions based on the experimental neutron multiplicity data can reproduce both PRE-and POST-FPY experimental data consistently.…”

Section: Introductionmentioning

confidence: 99%

Semi-empirical model to determine pre- and post-neutron fission product yields and neutron multiplicity

Lee,

Park

et al. 2022

Preprint

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Post-neutron emission fission product mass distributions are calculated by using pre-neutron emission fission product yields (FPYs) and neutron multiplicity. A semi-empirical model is used to calculate the pre-neutron FPY, first. Then the neutron multiplicity for each fission fragment mass is used to convert the pre-neutron FPY to the post-neutron FPY. In doing so, assumptions are made for the probability for a pre-emission fission fragment with a mass number A * to decay to a post-emission fragment with a mass number A. The resulting post-neutron FPYs are compared with the data available. The systems where the experimental data of not only the pre-and postneutron FPY but also neutron multiplicity are available are the thermal neutron-induced fission of 233 U, 235 U and 239 Pu. Thus, we applied the model calculations to these systems and compared the calculation results with those from the GEF and the data from the ENDF and the EXFOR libraries.Both the pre-and post-neutron fission product mass distributions calculated by using the semiempirical model and the neutron multiplicity reproduce the overall features of the experimental data.

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“…The mass distribution of products from low-energy fission has been studied extensively and is now fairly well known in good part through mea surements on stable isotopes done by mass spectrometry (5,7,8) . The situ ation is far from being the same in high-energy nuclear reactions, because of complications, both experimental and theoretical.…”

Section: Distribution Of High-energy Reaction Productsmentioning

confidence: 99%

“…Following the early work of Thode & Graham (4) in 1947 on Kr and Xe, the Canadian group of Thode, Tomlinson and their co-workers (5)(6)(7) has determined with the mass spectrometer practically all the major cumu lative yields and products produced in slow-neutron fission. See Hyde (8) for a discussion of the results.…”

Section: Mass Spectrometry (Offline)mentioning

confidence: 99%

Mass Separation for Nuclear Reaction Studies

Klapisch¹

1969

Annu. Rev. Nucl. Sci.

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Cumulative yields of the heavy fragments in U235 thermal neutron fission

Cited by 45 publications

References 30 publications

Multiple shock events recorded in the Northwest Africa 2139 LL6 chondrite: Implications for collisional histories of the LL chondrite parent body

Multiple shock events recorded in the Northwest Africa 2139 LL6 chondrite: Implications for collisional histories of the LL chondrite parent body

Semi-empirical model to determine pre- and post-neutron fission product yields and neutron multiplicity

Mass Separation for Nuclear Reaction Studies

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