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Physica B+C最新文献

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Measurement of double-photon compton scattering cross-sections of 662 keV gamma rays 662 keV伽马射线双光子康普顿散射截面的测量
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90090-3
G.S. Sekhon, B.S. Sandhu, B.S. Ghumman
{"title":"Measurement of double-photon compton scattering cross-sections of 662 keV gamma rays","authors":"G.S. Sekhon,&nbsp;B.S. Sandhu,&nbsp;B.S. Ghumman","doi":"10.1016/0378-4363(88)90090-3","DOIUrl":"10.1016/0378-4363(88)90090-3","url":null,"abstract":"<div><p>The cross-section for double-photon Compton scattering for incident photons of energy 662 keV and two emitted photons having energies ⩾ 100 keV has been measured at different scattering angles <em>θ</em><sub>1</sub> = 30° to 150° and <span><math><mtext>θ</mtext><msub><mi></mi><mn>2</mn></msub><mtext> = φ</mtext><msub><mi></mi><mn>2</mn></msub><mtext> = </mtext><mtext>π</mtext><mtext>2</mtext></math></span>. The experimental results are compared with the theory of Mandl and Skyrme. Some calculations are also carried out to understand the important features of the phenomenon.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90090-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89311941","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
Influence of initial conditions on squeezing and anti-bunching in the Jaynes-Cummings model 初始条件对Jaynes-Cummings模型中压缩和反聚束的影响
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90085-X
P.K. Aravind, Guanghui Hu
{"title":"Influence of initial conditions on squeezing and anti-bunching in the Jaynes-Cummings model","authors":"P.K. Aravind,&nbsp;Guanghui Hu","doi":"10.1016/0378-4363(88)90085-X","DOIUrl":"10.1016/0378-4363(88)90085-X","url":null,"abstract":"<div><p>We have carried out a detailed investigation of squeezing and anti-bunching in the Jaynes-Cummings model, thereby extending the earlier work of Meystre and Zubairy [Phys. Lett. 89 A (1982) 390]. Analytic criteria are formulated relating the initial states of atom and field to the tendency of the field to undergo squeezing or anti-bunching when the atom enters the cavity. Some interesting connections are established between atomic squeezing and field squeezing/anti-bunching. Using the initial conditions suggested by our criteria, we explore the generation of non-classical states of the cavity field. The relationship of our work to other recent work on squeezing and anti-bunching in the Jaynes-Cummings model is discussed.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90085-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88085061","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: 32
Divacancies production in irradiated n-type silicon 辐照n型硅的空位产生
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90069-1
O.O. Awadelkarim
{"title":"Divacancies production in irradiated n-type silicon","authors":"O.O. Awadelkarim","doi":"10.1016/0378-4363(88)90069-1","DOIUrl":"10.1016/0378-4363(88)90069-1","url":null,"abstract":"<div><p>Measurements of loss factor and capacitance made on single crystals of P-doped n-type silicon are reported. Samples are irradiated with (1.00 ± 0.20) MeV electrons at temperatures &lt;12K. The production of divacancies in the irradiated samples is monitored using hopping conductivity changes at 4.2 K. Higher divacancy production is observed in Czochralski-grown samples and samples containing appreciable concentrations of group III impurities. This suggests that oxygen and group III impurities trap the self interstitials, mobile under irradiation conditions, thus, inhibiting divacancy-self-interstitials annihilation. Effects of irradiation on the free carriers conductivity of the samples are also investigated.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90069-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78827267","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
Electronic structure of CeAg CeAg的电子结构
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90071-X
S.W. Luh, T.L. Liu
{"title":"Electronic structure of CeAg","authors":"S.W. Luh,&nbsp;T.L. Liu","doi":"10.1016/0378-4363(88)90071-X","DOIUrl":"10.1016/0378-4363(88)90071-X","url":null,"abstract":"<div><p>The Slater-Koster interpolation method is used in combination with the standard KKR method to get a set of quickly applicable energy bands for a mixed valence intermetallic compound CeAg.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90071-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83617135","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
Cohesive properties in the Al-Gd system Al-Gd体系的内聚性
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90080-0
C. Colinet, A. Pasturel, K.H.J. Buschow
{"title":"Cohesive properties in the Al-Gd system","authors":"C. Colinet,&nbsp;A. Pasturel,&nbsp;K.H.J. Buschow","doi":"10.1016/0378-4363(88)90080-0","DOIUrl":"10.1016/0378-4363(88)90080-0","url":null,"abstract":"<div><p>The standard molar enthalpies of formation of AlGd<sub>2</sub>, Al<sub>2</sub>Gd<sub>3</sub>, AlGd, Al<sub>2</sub>Gd and Al<sub>3</sub>Gd compounds were determined by dissolution calorimetry, using a calorimeter based on liquid aluminium. Experimental results are compared with model predictions. More particularly the alloy cluster Bethe lattice method has been used to analyse the chemical trend in the bonding properties of these compounds.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90080-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85550879","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: 24
Experimental lifetime for the B 3Πg (v = 0) level of N2 实验寿命为B 3Πg (v = 0)水平的N2
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90086-1
M. Ortiz, A. Perez, J. Campos
{"title":"Experimental lifetime for the B 3Πg (v = 0) level of N2","authors":"M. Ortiz,&nbsp;A. Perez,&nbsp;J. Campos","doi":"10.1016/0378-4363(88)90086-1","DOIUrl":"10.1016/0378-4363(88)90086-1","url":null,"abstract":"<div><p>Electron impact excitation followed by fluorescence induced by N<sub>2</sub>-laser absorption was used to study the lifetime of the lowest vibrational level of the B <sup>3</sup>Π<sub>g</sub> electronic state of N<sub>2</sub>. The experimental result of this work is 13 ± 1 μs and comparison is made with recent experimental and theoretical results.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90086-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72478880","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: 6
Modified version of ferromagnetic spin-wave excitations in the presence of a magnetic field 磁场存在下铁磁自旋波激发的修正版本
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90084-8
Shoichi Nagata, Shuji Ebisu, Satoshi Taniguchi
{"title":"Modified version of ferromagnetic spin-wave excitations in the presence of a magnetic field","authors":"Shoichi Nagata,&nbsp;Shuji Ebisu,&nbsp;Satoshi Taniguchi","doi":"10.1016/0378-4363(88)90084-8","DOIUrl":"10.1016/0378-4363(88)90084-8","url":null,"abstract":"<div><p>In the presence of an applied magnetic field, an energy gap exists in the spin-wave dispersion relation. As a consequence, the temperature dependence of the magnetization for ferromagnets must differ from the simple Bloch <em>T</em><sup><span><math><mtext>3</mtext><mtext>2</mtext></math></span></sup> law. For the first time, the modification factors have been calculated systematically.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90084-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80803437","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
Dipolar polarization in a single crystal of lithium acetate measured by NMR dispersion spectroscopy 用核磁共振色散光谱法测定醋酸锂单晶的偶极极化
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90072-1
E. Crits, L. Van Gerven, S. Emid
{"title":"Dipolar polarization in a single crystal of lithium acetate measured by NMR dispersion spectroscopy","authors":"E. Crits,&nbsp;L. Van Gerven,&nbsp;S. Emid","doi":"10.1016/0378-4363(88)90072-1","DOIUrl":"10.1016/0378-4363(88)90072-1","url":null,"abstract":"<div><p>Using a new type of NMR dispersion spectrometer we have made an extensive study of the tunnelling induced nuclear dipolar polarization effect or Haupt effect in lithium acetate single crystals. Special attention is paid to the temperature dependence and angular dependence of the Haupt effect.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90072-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72918975","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: 6
Crystalline electric field effects in the magnetic properties of hexagonal praseodymium compounds 晶体电场对六方镨化合物磁性能的影响
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90081-2
J. Mrachkov, E. Leyarovski
{"title":"Crystalline electric field effects in the magnetic properties of hexagonal praseodymium compounds","authors":"J. Mrachkov,&nbsp;E. Leyarovski","doi":"10.1016/0378-4363(88)90081-2","DOIUrl":"10.1016/0378-4363(88)90081-2","url":null,"abstract":"<div><p>The high field magnetization and the magnetic susceptibility of hexagonal praseodymium compounds are calculated on the basis of a molecular field Hamiltonian, including the CEF potential, a Zeeman term, and isotropic exchange interactions. At low temperatures it is shown that the full magnetic moment of the Pr<sup>3+</sup> ion is always reached in a stepwise manner for a magnetic field applied along the <em>c</em>-axis. Perpendicular to the <em>c</em>-axis this occurs only in the case of a Γ<sub>4</sub> ground state. This is a pure CEF effect, resulting from the crossing of the ground state by an excited state with a higher magnetic moment. The temperature dependence of the magnetic susceptibility would have a maximum corresponding to an appreciable population of an excited state with a greater magnetic moment. Some hexagonal Pr compounds are considered in which the discussed effects are or should be observable.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90081-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78632652","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: 6
Study of the interatomic forces in the A15 superconducting compounds A15超导化合物中原子间作用力的研究
Physica B+C Pub Date : 1988-06-01 DOI: 10.1016/0378-4363(88)90068-X
Vijay Baboo Gupta, H.C. Gupta
{"title":"Study of the interatomic forces in the A15 superconducting compounds","authors":"Vijay Baboo Gupta,&nbsp;H.C. Gupta","doi":"10.1016/0378-4363(88)90068-X","DOIUrl":"10.1016/0378-4363(88)90068-X","url":null,"abstract":"<div><p>The lattice dynamics of the A15 superconducting compounds have been investigated using a model in which the interatomic forces include, in addition to central forces, the angular forces of the type employed by de Launey. This model has been applied to Mo<sub>3</sub>Si, Cr<sub>3</sub>Si and V<sub>3</sub>Si to investigate the phonon dispersion curves in the three symmetry directions of the Brillouin Zone. The force constants have been evaluated by fitting them to the measured values of the phonons at the zone centre. The calculated results are found to be in good agreement with the available experimental results. It has been inferred that the angular forces are not important for these compounds. The physical aspects for the same are discussed.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90068-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81175779","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: 2
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