Journal of Nuclear Energy (1954)最新文献_第4页

Spectra of secondary neutrons produced in the passage of fast neutrons through layers of various materials 快中子通过各种材料层时产生的次级中子光谱

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90136-6

Yu.S. Zamyatnin, E.K. Gutnikova, N.I. Ivanova, I.N. Safina

引用次数: 4

Secondary nuclear reactions induced in tin by fast protons 快质子在锡中引起的二次核反应

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90179-6

M.Ia. Kuznetsova, V.N. Mekhedov, V.A. Khalkin

{"title":"Secondary nuclear reactions induced in tin by fast protons","authors":"M.Ia. Kuznetsova, V.N. Mekhedov, V.A. Khalkin","doi":"10.1016/0891-3919(59)90179-6","DOIUrl":"10.1016/0891-3919(59)90179-6","url":null,"abstract":"<div>Nuclear reactions in which spallation products are captured by the target nucleus have been studied by the radio-chemical method. The excitation functions of secondary reactions leading to product nuclei having charges 2 or 3 units greater than that of the target nuclei have been obtained from measurements of the yields of isotopes of tellurium (Z = 52) and iodine (Z = 53) formed in the 170–660 MeV proton bombardment of tin (Z = 50). The cross-sections of these reactions increase with increasing proton energy: for Ep = 170 MeV, σ(α, xn) and σ(Li, xn) are 18·5 ± 5 and 0·17 ± 0·1 μbarns, respectively; for Ep = 660 MeV, these cross-sections are 50 ± 6·5 and 1·6 ± 0·5 μbarns, respectively. The cross-sections for the capture of lithium nuclei by tin obtained in this work are in good agreement with the results for similar reactions with copper, tin, and lead over a comparable proton energy interval but they are 50 times less than the cross-sections found by Marquez and Perlman. The observed secondary reaction cross-sections for the capture of lithium nuclei can be accounted for only by supposing that the lithium nuclei are emitted with energies greater than they could acquire as a result of fission or evaporation of the target nucleus. Secondary reactions of the type (α, xn) can be accounted for by assuming that the m-particles are emitted as a result of the evaporation process.</div>","PeriodicalId":100812,"journal":{"name":"Journal of Nuclear Energy (1954)","volume":"9 1","pages":"Pages 240-247"},"PeriodicalIF":0.0,"publicationDate":"1959-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0891-3919(59)90179-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88280340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The measurement of νeff and σf + σc of 235U and 239Pu for fast neutrons 快中子235U和239Pu的νeff和σf + σc的测量

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90154-2

V.N. Andreev

引用次数: 2

The elastic scattering of neutrons in cylindrical absorbers 中子在圆柱形吸收器中的弹性散射

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90159-5

T.Kh. Sedelnikov

引用次数: 0

On the angular distribution of the light and heavy fragments from the fission of 238U by 14 MeV neutrons 14mev中子裂变238U后轻、重碎片的角分布

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90160-6

引用次数: 0

Spectra of secondary neutrons produced in the passage of 14 MeV neutrons through layers of fissile material 14兆电子伏中子穿过可裂变物质层时产生的次级中子光谱

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90170-2

Yu.S. Zamyatnin, I.N. Safina, E.K. Gutnikova, N.I. Ivanova

引用次数: 5

The composition and instability constants of +3 oxalate complex ions 草酸+3络合离子的组成及不稳定常数

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90132-3

A.D. Gel′man, N.N. Matorina, A.I. Moskvin

{"title":"The composition and instability constants of +3 oxalate complex ions","authors":"A.D. Gel′man, N.N. Matorina, A.I. Moskvin","doi":"10.1016/0891-3919(59)90132-3","DOIUrl":"10.1016/0891-3919(59)90132-3","url":null,"abstract":"<div>The solubility of Pu2(C2O4)3·9H2O in aqueous K2C2O4 solutions of from 0·01 to 2·4 M was determined at 20°C and constant onic strength. It was established that Pu+3 forms complexes in these solutions. The solubility data show the following complex ions in this concentration range: [Pu(C2O4)2]−, [PU(C2O4)3]−3 and [PU(C2O4)4]−5 with overall instability constants of 4·9 × 10−10, 4·10 × 10-10, and 11·9 ×x 10−11 respectively. The solubility of PU2(C2O4)3·9H2O in 0·07 to 0·7 M aqueous (NH4) 2 C204 solutions at 70°C was also determined. Under these conditions, the complex ions formed were shown to be [PU(C2O4)2]−, [Pu(C2O4)3]−3 and [PU(C2O4)4]−5. The calculated overall instability constants are 11·6 × 10−9, 5·6 × 10−9 and 2·5 x 10−9 respectively. Heats of formation of the Pu+3 oxalate complex ions were calculated for the reaction Pu+3 + nC2O4−2 2 : [Pu(C2O4)n]3−2n. ΔQ for [PU(C2O4)2]− is 1300 cal, for [PU(C2O4)3]−3 1200 cal and for [Pu(C2O4)4]−5 1300 cal.</div>","PeriodicalId":100812,"journal":{"name":"Journal of Nuclear Energy (1954)","volume":"9 1","pages":"Pages 1-8"},"PeriodicalIF":0.0,"publicationDate":"1959-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0891-3919(59)90132-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81724878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective boundary conditions in the theory of neutron diffusion (A review) 中子扩散理论中的有效边界条件(综述)

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90182-5

G.A. Bat', D.F. Zaretskii

引用次数: 2

Time-of-flight measurements of neutron spectra at energies below 0·5 MeV 能量低于0.5 MeV的中子能谱的飞行时间测量

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90137-4

Yu.A. Vasilev, Yu.S. Zamyatnin, P.V. Toropov, E.F. Fomushkin

引用次数: 2

An upper limit to frequency in a synchrotron 同步加速器频率的上限

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 Epub Date: 2015-07-13 DOI: 10.1016/0891-3919(59)90147-0

E.M. Moroz, M.S. Rabinovich

引用次数: 1