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Physics-A Journal of General and Applied Physics最新文献

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Asynchronous excitation of a plasma instability 等离子体不稳定性的异步激发
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/003
B. Keen
{"title":"Asynchronous excitation of a plasma instability","authors":"B. Keen","doi":"10.1088/0305-4470/5/8/003","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/003","url":null,"abstract":"Results are presented which show that the classical effect of 'asynchronous excitation of an oscillator' can be applied to the excitation of an ion sound instability in a plasma. Further, the predicted upper and lower threshold values of the asynchronous driving amplitude are observed, for the region in which the instability is excited.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88745630","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
Lattice Green function for the simple cubic lattice 格格林函数为简单立方格
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/001
G. Joyce
{"title":"Lattice Green function for the simple cubic lattice","authors":"G. Joyce","doi":"10.1088/0305-4470/5/8/001","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/001","url":null,"abstract":"A particular lattice Green function for the simple cubic lattice is evaluated exactly as a square of a Heun function, and as a product of two complete elliptic integrals of the first kind. Applications of these results in lattice statistics are briefly described.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75218644","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: 51
The Onsager reaction field as a screened self-interaction in refractive index theory 折射率理论中Onsager反应场作为屏蔽的自相互作用
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/022
F. Hynne, R. Bullough
{"title":"The Onsager reaction field as a screened self-interaction in refractive index theory","authors":"F. Hynne, R. Bullough","doi":"10.1088/0305-4470/5/8/022","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/022","url":null,"abstract":"The authors give a microscopic derivation of a formula of Bottcher's type for the refractive index. In this a macroscopic cavity field replaces the Lorentz internal field and the polarizability is modified by many-body self-interactions. These combine both an Onsager type reaction field and a screened radiation reaction. The microscopic argument resolves apparent conflict between the two different macroscopic approaches to the internal field problem.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"74 1","pages":"1272-1295"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73604288","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: 11
The ground state rotational bands in 150Sm and 152Sm 150Sm和152Sm的基态旋转带
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/002
A. J. Hartley, R. Chapman, G. Dracoulis, S. Flanagan, W. Gelletly, J. Mo
{"title":"The ground state rotational bands in 150Sm and 152Sm","authors":"A. J. Hartley, R. Chapman, G. Dracoulis, S. Flanagan, W. Gelletly, J. Mo","doi":"10.1088/0305-4470/5/8/002","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/002","url":null,"abstract":"The gamma rays from the 150Nd ( alpha ,4n) 150Sm and 150Nd ( alpha ,2n) 152Sm reactions have been studied both in singles and coincidence. The ground state rotational bands in 150Sm and 152Sm are populated up to the state with spin 10+. It is found that the nuclear moment of inertia of 150Sm is substantially lower than that of 152Sm for the low spin states, but that it increases with spin and the moments of inertia converge for the high spin states. This supports earlier evidence that the change from spherical to deformed nuclei between N=88 and N=90 is gradual.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91324711","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: 4
Phase transitions in a one dimensional model of a ferromagnet: a transfer-matrix approach 铁磁体一维模型中的相变:转移矩阵方法
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/010
J. Martin
{"title":"Phase transitions in a one dimensional model of a ferromagnet: a transfer-matrix approach","authors":"J. Martin","doi":"10.1088/0305-4470/5/8/010","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/010","url":null,"abstract":"It is shown that a transfer-matrix method provides a particularly direct solution for a ferromagnetic version of a one dimensional model originally invented by Fisher (1967). An essential feature of this model is the many body potential leading to a phase transition. All the thermodynamical properties of the model may be written down once the dominant eigenvalue and eigenvector of the matrix are known; in particular, surface properties may be obtained in terms of the dominant eigenvector. Typical phase diagrams are obtained, and the singularities at the phase boundaries discussed.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"5 1","pages":"1176-1187"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87368553","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
Lifetime of the 321 keV(9/2-) state in 125Te 321 keV(9/2-)状态在125Te下的寿命
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/017
G. Satyanarayana, V. Ramamurty, V. Lakshminarayana
{"title":"Lifetime of the 321 keV(9/2-) state in 125Te","authors":"G. Satyanarayana, V. Ramamurty, V. Lakshminarayana","doi":"10.1088/0305-4470/5/8/017","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/017","url":null,"abstract":"The halflife of the 321 keV(9/2-) state in 125Te is measured by the delayed coincidence technique employing a time-to-amplitude converter. On comparing the experimental M1 and E2 transition probabilities with those evaluated by the single particle model, Kisslinger's three-quasiparticle model and the De-Shalit model, it is found that De-Shalit's single particle-core coupling model is applicable in this case.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"31 1","pages":"1243-1247"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87274853","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: 1
Time variation of the coupling constants 耦合常数随时间的变化
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/023
P. Davies
{"title":"Time variation of the coupling constants","authors":"P. Davies","doi":"10.1088/0305-4470/5/8/023","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/023","url":null,"abstract":"The possibility of the variation with time of the electromagnetic and strong coupling constants is investigated using nuclear systematics. Previous work by Dyson (1967) and Broulik and Trefil (see abstr. A57272 of 1971) is re-examined and extended, with the conclusion that Teller's hypothesis of a logarithmic time dependence of the fine structure constant is apparently within the limits discussed if there is a corresponding logarithmic time dependence of the strong coupling constant also. Moreover the recent discovery of naturally occurring 244Pu places the Gamow hypothesis of e2 approximately t much nearer the allowable limits than had previously been supposed.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"10 1","pages":"1296-1304"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89403163","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: 26
The velocity distribution function for a polymer chain 聚合物链的速度分布函数
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/011
S. Edwards, A. G. Goodyear
{"title":"The velocity distribution function for a polymer chain","authors":"S. Edwards, A. G. Goodyear","doi":"10.1088/0305-4470/5/8/011","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/011","url":null,"abstract":"The Gibbs distribution for a polymer molecule contains implicitly the correlation functions for velocity and position of the constituent monomers. The purely spatial part, ignoring potentials, gives the random flight distribution; the velocity correlation function is calculated, exploiting the markovian structure of the problem in phase space. It is shown that the problem can be reduced to an eigenfunction problem and hence solved. The form of the correlation function is quite accurately given by ( nu n1- nu n2)2=(2kT/m)(1-exp(-c mod n1-n2 mod )) where nu n1, nu n2 are the velocities of the n1th and n2th monomers and c equivalent to 1.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"10 1","pages":"1188-1195"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77261773","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: 16
The beat spectrum of the fission products from 252Cf and the associated inner bremsstrahlung radiation 252Cf的裂变产物的热谱和相关的内轫致辐射
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/021
R. Heller, I. Sugai, Y. Cheng, L. Chiao
{"title":"The beat spectrum of the fission products from 252Cf and the associated inner bremsstrahlung radiation","authors":"R. Heller, I. Sugai, Y. Cheng, L. Chiao","doi":"10.1088/0305-4470/5/8/021","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/021","url":null,"abstract":"Beta ray intensity against energy in the decay of 252Cf has been calculated as a function of time and it is predicted that 7.0 beta rays are emitted per fission. The inner bremsstrahlung radiation from all decaying fragments is shown to be equivalent, in the first 40.96 s after fission, to the radiation from a black body which cools from 1.5*1010 to 1.2*1010K.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"25 1","pages":"1266-1271"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85180561","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
GROUP ALGEBRAS AND TENSOR OPERATORS. 群代数与张量算子。
Physics-A Journal of General and Applied Physics Pub Date : 1972-08-01 DOI: 10.1088/0305-4470/5/8/006
J. Killingbeck
{"title":"GROUP ALGEBRAS AND TENSOR OPERATORS.","authors":"J. Killingbeck","doi":"10.1088/0305-4470/5/8/006","DOIUrl":"https://doi.org/10.1088/0305-4470/5/8/006","url":null,"abstract":"The conditions under which class sum operators for a finite group are hermitian are discussed. A class of linear mapping within the group algbra is treated, together with methods of obtaining elements which are symmetry adapted with respect to these mappings. Traditional tensor operators are treated as symmetry adapted elements of the group algebra, and the absence of certain types of tensor operator from the group algebra of direct product groups is discussed. The relevance of the work to operator equivalent theory is briefly indicated.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"130 3","pages":"1131-1137"},"PeriodicalIF":0.0,"publicationDate":"1972-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72575748","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: 3
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