EFFECT OF MODERATORS ON THE (n,γ) ACTIVATED REACTION OF Br80 WITH CH41

Rack, E. P.; Gordus, Adon A.

doi:10.1021/j100824a013

Cited by 35 publications

(19 citation statements)

References 2 publications

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“…A similar drop was observed by Rack (59) indicates that no significant long-term radiation-induced reactions were occurring during the irradiation.…”

Section: Countersupporting

confidence: 82%

Yields of Fission-Recoil Bromine by Delayed-Neutron Studies

Silbert

Tomlinson

1966

Radiochimica Acta

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target by the hot-atom reaction of the fission recoils with methane to form organic bromideso The organically-bound bromine was shown to be formed preferentially by primary (independently-formed) bromine with little contribution from secondary bromine.The delayed-neutron activity of the short-lived bromine isotopes was anaJ.yzed to obtain the relative yields of delayedneutrons from Br8?, Br88 and Br89 produced as primary fission products. The relative delayed-neutron yields are summarized below. lo2 -OolThe primary yields of the three isotopes in fission were estimated on the basis of their delayed-neutron yields.

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“…A similar drop was observed by Rack (59) indicates that no significant long-term radiation-induced reactions were occurring during the irradiation.…”

Section: Countersupporting

confidence: 82%

Yields of Fission-Recoil Bromine by Delayed-Neutron Studies

Silbert

Tomlinson

1966

Radiochimica Acta

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“…More direct experimental evidence comes from the electron-diffraction study of the structure of cyclohexene,6 and from an x-ray diffraction study of the molecular and crystal structure of cyclohexenylcyclobutenedione. 7 Bond lengths, bond angles, and torsion angles for cyclohexene have been reported by Corey and Sneen,8 Bucourt,9 and Bucourt and Hainant …”

Section: Molecular Structurementioning

confidence: 73%

NMR Study of Molecular Motions and Phase Transitions in Cyclohexene

Saffar

Eades

Llewellyn

1969

The Journal of Chemical Physics

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NMR measurements of the mean-square width and the spin-lattice relaxation time have been made in polycrystalline cyclohexane from 65° to the melting point 169.7°K. The results show that cyclohexane has three solid phases and two forms of molecular reorientations. On cooling the specimen, phase III (169.7°-128.5°K) is obtained first, followed by phase I (128S-65°K). On warming the specimen to 1l00K an irreversible transition from phase I to phase II takes place. Another irreversible transition from phase II to phase III takes place at 138.8°K. In phase I, the lattice is essentially rigid below about 1000K, while above this temperature, classical rotation about an axis normal to the "plane" of the molecule takes place. Above 115°K ring inversion of the half-chair form of the molecule is believed to take place, and in phase III this motion becomes effective in reducing the mean-square width. Phase II, which persists below 138.8°K, is characterized by the absence of molecular motion.

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“…This indicates that (η, γ) reaction can produce multiply positively charged iodine atoms in at least 18% of the neutron capture events while the experiments of WEXLER and DAVIS [17] and RACK etal. [18] have shown that the positively charged iodine atoms are about 50% and 36%, respectively. It may be mentioned here that the observation of FENGER et al [19], on the effect of γ-radiation during reactor irradiation of alkaline aqueous orthophosphate, has shown that low γ-dose causes a large variation of relative yields.…”

Section: Discussionmentioning

confidence: 99%

Some Studies on (n, γ) Recoil of lodine-128 in Alkaline Aqueous lodate and Periodate

Bera¹,

Shukla²

1978

Radiochimica Acta

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Hot atom chemistry / Iodine-128 / lodate / PeriodateSummary (n, y) reactions in alkaline aqueous solutions of KIO, and KI0 4 have been studied in presence of chloride and acetate additives. It has been found that the retentions and yields are remarkably influenced by additives. The radioiodate, -iodide and -periodate fractions observed from neutron irradiation of alkaline aqueous KI0 3 are about 20%, 75% and 5%, respectively, while those observed from alkaline aqueous KI0 4 are about 80%, 10% and 10%, respectively. With the increase of concentrations of the additives, the radioiodate, -iodide and -periodate yields reach the limiting values of about 28%, 54% and 18%, respectively, from both KIO3 and KI0 4 . The irradiation in frozen alkaline aqueous phase leads to retentions and yields remarkably different from those observed in the aqueous phase. The role of water molecules and additives, post recoil effect and chemical effects associated with local radiolysis and internal conversion are discussed to explain the observed results.

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EFFECT OF MODERATORS ON THE (n,γ) ACTIVATED REACTION OF Br⁸⁰ WITH CH₄¹

Cited by 35 publications

References 2 publications

Yields of Fission-Recoil Bromine by Delayed-Neutron Studies

Yields of Fission-Recoil Bromine by Delayed-Neutron Studies

NMR Study of Molecular Motions and Phase Transitions in Cyclohexene

Some Studies on (n, γ) Recoil of lodine-128 in Alkaline Aqueous lodate and Periodate

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