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Flux and reactive contributions to electron transport in methane. 通量和反应对甲烷中电子传递的贡献。
Australian Journal of Physics Pub Date : 2000-06-15 DOI: 10.1071/PH99087
K. Ness, A. M. Nolan
{"title":"Flux and reactive contributions to electron transport in methane.","authors":"K. Ness, A. M. Nolan","doi":"10.1071/PH99087","DOIUrl":"https://doi.org/10.1071/PH99087","url":null,"abstract":"A previously developed theoretical analysis (Nolan et al. 1997) is applied to the study of electron transport in methane for reduced electricfields in the range 1 to 1000 Td. The technique of analysis identifies the flux and reactive components of the measurable transport, without resort to the two-term approximation. A comparison of the results of the Monte Carlo method with those of a multiterm Boltzmann equation analysis (Ness and Robson 1986) shows good agreement. The sensitivity of the modelled electron transport to post-ionisation energy partitioning is studied by comparison of three ionisation energy partitioning regimes at moderate (300 Td) and high (1000 Td) values of the reduced electricfield.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125526949","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
Collapses and revivals of the coherence of a mesoscopic superposition of motional states. 运动状态的介观叠加的相干性的崩溃和恢复。
Australian Journal of Physics Pub Date : 2000-06-15 DOI: 10.1071/PH99056
Shi-Biao Zheng
{"title":"Collapses and revivals of the coherence of a mesoscopic superposition of motional states.","authors":"Shi-Biao Zheng","doi":"10.1071/PH99056","DOIUrl":"https://doi.org/10.1071/PH99056","url":null,"abstract":"A scheme is proposed to observe the collapses and revivals of a mesoscopic superposition of coherent states in the motion of a trapped ion. In the scheme the ion motion in the x-axis is first prepared in a Schrodinger cat state, and then coupled to the motion in the z-axis. With the vibrational excitation exchange between the two modes, the mesoscopic quantum coherence collapses and revives periodically, providing an example for complementarity.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128429394","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
Monopole in the Dilatonic Gauge Field Theory 扩张规范场论中的单极子
Australian Journal of Physics Pub Date : 2000-05-25 DOI: 10.1071/PH99059
D. Karczewska, R. Mańka
{"title":"Monopole in the Dilatonic Gauge Field Theory","authors":"D. Karczewska, R. Mańka","doi":"10.1071/PH99059","DOIUrl":"https://doi.org/10.1071/PH99059","url":null,"abstract":"A numerical study of static, spherically symmetric monopole solutions coupled to the dilaton field, inspired by the Kaluza–Klein theory with large extra dimensions is presented. The generalised PrasadeSommerfield solution is obtained. We show that the monopole may also have the dilaton cloud configurations.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116050659","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
Electromagnetic and Gravitational Decay of the Higgs Boson 希格斯玻色子的电磁和引力衰变
Australian Journal of Physics Pub Date : 2000-04-17 DOI: 10.1071/PH00048
R. Delbourgo, Dong-sheng Liu
{"title":"Electromagnetic and Gravitational Decay of the Higgs Boson","authors":"R. Delbourgo, Dong-sheng Liu","doi":"10.1071/PH00048","DOIUrl":"https://doi.org/10.1071/PH00048","url":null,"abstract":"The decays of a scalar particle, of either parity, into two photons or into two gravitons are evaluated. The effective interactions are of the form φ FF , φ FF ~ or φ RR , φ RR ~ ; in particular, the Higgs meson decay mode into gravitons is tiny and can be neglected. In two recent papers, Srivastava and Widom (2000 a , 2000 b ) have claimed that the decay width of the Higgs meson into two gravitons is given by �� 2 G F m 3 /16 π . In their result, which they say stems from an effective interaction φ R / � φ � , Newton's constant disappears and gets replaced by the Fermi constant, leading to a large magnitude for the process. If their result were true, it would be counter-intuitive to the notion that gravitational interactions are miniscule in particle physics and it would imply that the Higgs mesons disappears very quickly into a puff of gravitational plus electromagnetic radiation! In this paper we revisit this interesting problem and derive the correct magnitudes for the decay amplitudes, be the decaying particle scalar or pseudoscalar; our faith in the weakness of induced gravitational (and electromagnetic) effects is happily restored. We consider parity-conserving decays of a 0 + or 0 − particle into two photons γ or into two gravitons h . A simple helicity amplitude analysis (Delbourgo and Liu 1998) shows that either process is governed by just one reduced helicity amplitude, � k , λ ; k ′ , λ′ | S |0 � , where λ = λ′ = 1 or 2, because of parity conservation. The same conclusion is reached by a covariant amplitude analysis, using the twin principles of gauge and general covariance. If e represents the external wavefunction of an incoming massless particle ( γ or h ), we may write down the unique couplings:","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"406 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122722884","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
Some implications of the gravitomagnetic field in fractal spacetime theory. 重力磁场在分形时空理论中的若干意义。
Australian Journal of Physics Pub Date : 2000-04-15 DOI: 10.1071/PH99009
M. Agop, H. Matsuzawa, I. Oprea, R. Vlad, C. Sandu, C. Buzea
{"title":"Some implications of the gravitomagnetic field in fractal spacetime theory.","authors":"M. Agop, H. Matsuzawa, I. Oprea, R. Vlad, C. Sandu, C. Buzea","doi":"10.1071/PH99009","DOIUrl":"https://doi.org/10.1071/PH99009","url":null,"abstract":"In a fractal spacetime, the absence of a gravitational Meissner effect is thought of as ordering space as a crystal, at both a microscopic and a macroscopic scale. A gravitational Meissner effect keeps a wormhole open and penetrable and, in the same context, a gravitational superconductor levitates in an external gravitomagnetic field, an external gravitomagnetic field induces quantised vortices in a gravitational superconductor and gravitational rotons in a superfluid, and the planetary systems are self-organised as superconducting structures.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125408986","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: 7
An atomistic interpretation of Planck's 1900 derivation of his radiation law. 普朗克1900年对他的辐射定律的推导的原子解释。
Australian Journal of Physics Pub Date : 2000-04-15 DOI: 10.1071/PH99063
F. Irons
{"title":"An atomistic interpretation of Planck's 1900 derivation of his radiation law.","authors":"F. Irons","doi":"10.1071/PH99063","DOIUrl":"https://doi.org/10.1071/PH99063","url":null,"abstract":"In deriving his radiation law in 1900, Max Planck employed a simple harmonic oscillator to model the exchange of energy between radiation and matter. Traditionally the harmonic oscillator has been viewed as modelling an entity which is itself oscillating, although a suitable oscillating entity has not been forthcoming. (Opinion is divided between a material oscillator, an imaginary oscillator and a need to revise Planck\"s derivation to apply to cavity modes of oscillation). We offer a novel, atomistic interpretation of Planck\"s derivation wherein the harmonic oscillator models a transition between the internal quantum states of an atom|not a normal electronic atom characterised by possible energies 0 and hv, but an atom populated by subatomic bosons (such as pions) and characterised by multiple occupancy of quantum states and possible energies nhv (n= 0;1;2; :::). We show how Planck\"s derivation can be varied to accommodate electronic atoms. A corollary to the atomistic interpretation is that Planck\"s derivation can no longer be construed as support for the postulate that material oscillating entities can have only those energies that are multiples of hv.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125200456","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: 17
The low-energy 9Be(g, n)8Be cross section. 低能9Be(g, n)8Be截面。
Australian Journal of Physics Pub Date : 2000-04-15 DOI: 10.1071/PH99065
F. C. Barker
{"title":"The low-energy 9Be(g, n)8Be cross section.","authors":"F. C. Barker","doi":"10.1071/PH99065","DOIUrl":"https://doi.org/10.1071/PH99065","url":null,"abstract":"Fits are made to low-energy 9 Be(g;n) 8 Be cross-section data using one-level R-matrix formulae including channel contributions. Fits with reasonable parameter values are found for the newer radioactive-isotope data, and also for data obtained from inelastic electron scattering on 9 Be, but not for older radioactive-isotope data. This differs from the result of recent fits using a semi-microscopic model, which supported the older data. The difference is attributed to the use in the latter calculation of a single-particle potential description of the continuum wave function.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132412302","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
Bonding without ionisation. 没有电离的成键。
Australian Journal of Physics Pub Date : 2000-04-15 DOI: 10.1071/PH99027
E. N. Maslen, B. Etschmann
{"title":"Bonding without ionisation.","authors":"E. N. Maslen, B. Etschmann","doi":"10.1071/PH99027","DOIUrl":"https://doi.org/10.1071/PH99027","url":null,"abstract":"Charges are calculated for diatomic molecules by partitioning the promolecular density with projection operators derived from free atom potentials. The promolecular charges thus obtained have physically reasonable magnitudes, which are moderately sensitive to interatomic distances and thus to bond type. Their signs are negative for cations and positive for anions. Trends in these charges correlate with subshell structure. Due to the long range of their electrostatic potentials, the cations compete successfully for electrons at the expense of the anions in the density partitioning. This implies that the cation states become overfilled when the atoms overlap, favouring a flow of electrons away from the cation towards the vacant anion states. That accounts for the positive cations and negative anions observed when molecular densities are partitioned with projection operators based on free atom electron densities.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744739","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
Hybrid model for drift waves in fully three-dimensional plasmas: Theory and applications. 全三维等离子体中漂移波的混合模型:理论与应用。
Australian Journal of Physics Pub Date : 2000-04-15 DOI: 10.1071/PH98111
J. Lewandowski
{"title":"Hybrid model for drift waves in fully three-dimensional plasmas: Theory and applications.","authors":"J. Lewandowski","doi":"10.1071/PH98111","DOIUrl":"https://doi.org/10.1071/PH98111","url":null,"abstract":"A novel fluid/gyro-kinetic hybrid model to study drift waves in low-pressure stellarator plasmas is presented. The ion population is modeled with the collisionless gyro-kinetic equation and the electron population is described using fluid equations. The model equations are written in straight-field-line coordinates and are valid for any magnetic configuration with closed, nested magnetic surfaces. The geometrical effects which enter the final eigenmode equations are derived and discussed in some detail. The numerical method used to solve the coupled, time-dependent, along-the-field-line equations is described. The geometrical effects are discussed in some detail. Numerical calculations are carried out for a three-field period toroidal heliac with small global magnetic shear.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115400318","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
Stability of a modulated ion acoustic wave in a magnetised plasma. 磁化等离子体中调制离子声波的稳定性。
Australian Journal of Physics Pub Date : 2000-04-15 DOI: 10.1071/PH99001
Md. Khurshedul Alam, A. Chowdhury
{"title":"Stability of a modulated ion acoustic wave in a magnetised plasma.","authors":"Md. Khurshedul Alam, A. Chowdhury","doi":"10.1071/PH99001","DOIUrl":"https://doi.org/10.1071/PH99001","url":null,"abstract":"A nonlinear Schrodinger equation which governs the nonlinear interaction of the ion-acoustic wave with the quasistatic plasma slow response in a magnetised plasma is deduced. The magnetic field is assumed to be constant. It is observed that the coefficient of the nonlinear term in the derived nonlinear Schrodinger equation turns out to be complex, in contrast to the usual situation. The condition for modulational stability is derived and it is found to be somewhat different. In the final section such a condition is discussed graphically. Our NLS equation goes back to that of the unmagnetised case if wc is put to zero.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134172885","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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