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

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 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

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 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

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 DOI: 10.1016/0891-3919(59)90154-2

V.N. Andreev

引用次数: 2

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 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 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 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 DOI: 10.1016/0891-3919(59)90160-6

引用次数: 0

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 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

Neutron flux distributions in media separated by a plane boundary 以平面边界分隔的介质中的中子通量分布

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 DOI: 10.1016/0891-3919(59)90173-7

I.I. Talyanskii

引用次数: 0

Gamma-ray spectra excited by the inelastic scattering of fast neutrons by Mg, Al, Fe, Cu, Sn, and Sb 由Mg, Al, Fe, Cu, Sn和Sb的快中子的非弹性散射激发的伽玛射线谱

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 DOI: 10.1016/0891-3919(59)90148-9

I.F. Barchuk, M.V. Pasechnik, Iu.A. Tsibul'ko

{"title":"Gamma-ray spectra excited by the inelastic scattering of fast neutrons by Mg, Al, Fe, Cu, Sn, and Sb","authors":"I.F. Barchuk, M.V. Pasechnik, Iu.A. Tsibul'ko","doi":"10.1016/0891-3919(59)90148-9","DOIUrl":"10.1016/0891-3919(59)90148-9","url":null,"abstract":"<div>The study of the inelastic scattering of fast neutrons is of considerable theoretical and practical importance. From the theoretical point of view such studies provide information about the levels of stable nuclei. The practical value of these studies is due to the importance of inelastically scattered neutrons in the operation of fast neutron reactors. A knowledge of the spectra of the inelastically scattered neutrons is essential to the provision of a sound theory of fast reactors. (1,2) In order to provide this information, the last 5–7 years has seen a considerable amount of work devoted to the development of fast neutron spectrometry and to the spectroscopy of the gamma-rays accompanying inelastic neutron scattering.In this paper, we report measurements of the spectra of gamma-rays excited by the inelastic scattering of 2·8 MeV neutrons by Mg, Al, Fe, Cu, Sn, and Sb. A NaI(Tl) scintillation spectrometer was used in this work in conjunction with a photomultiplier, type FEU-1B, and a 50 channel pulse height analyser incorporating a magnetic drum memory device. For 60Co gamma-rays, the resolution of the spectrometer was 6·5–7 per cent. Gamma-rays having the following energies (MeV) were observed: Mg 0·97; 1·41; 1·92; 2·3. Al 0·84; 1·00; 1·80; 2·16. Fe 0·84; 1·25; 1·46; 1·70. Cu 0·63; 0·78; 0·96; 1·12; 1·38; 1·46; 1·72; 2·03. Sn 0·84; 1·16; 1·50; 1·80; 2·16. Sb 1·04; 1·50; 1·84; 2·16.</div>","PeriodicalId":100812,"journal":{"name":"Journal of Nuclear Energy (1954)","volume":"9 1","pages":"Pages 120-127"},"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)90148-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85474935","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: 5

14 MeV fission cross-sections of 232Th and 237Np 232Th和237Np的14mev裂变截面

Journal of Nuclear Energy (1954) Pub Date : 1959-06-01 DOI: 10.1016/0891-3919(59)90157-7

A.N. Protopopov, Iu.A. Seltiskii, S.M. Solov'ev

引用次数: 0