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The quantum potential approach to neutron interferometry experiments 中子干涉实验的量子势方法
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90161-1
C. Dewdney
{"title":"The quantum potential approach to neutron interferometry experiments","authors":"C. Dewdney","doi":"10.1016/0378-4363(88)90161-1","DOIUrl":"10.1016/0378-4363(88)90161-1","url":null,"abstract":"<div><p>It is shown that the quantum potential approach to quantum mechanics, originated by de Broglie and Bohm, can account for the essential features of spatial interference and spin superposition, observed with neutron interferometers, in terms of well-defined individual particle motions.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 160-170"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90161-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74344466","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
Test of the time dependent Schrödinger equation with very slow neutrons 用非常慢的中子测试与时间有关的Schrödinger方程
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90157-X
J. Felber, R. Gähler, R. Golub
{"title":"Test of the time dependent Schrödinger equation with very slow neutrons","authors":"J. Felber,&nbsp;R. Gähler,&nbsp;R. Golub","doi":"10.1016/0378-4363(88)90157-X","DOIUrl":"10.1016/0378-4363(88)90157-X","url":null,"abstract":"<div><p>Very slow neutrons with matter wave frequencies ⩽10<sup>11</sup> Hz offer the possibility to observe “diffraction in time”, the spreading in frequency (and velocity) die to the interaction with time varying potentials. These effects can be regarded as a test of the time dependent Schrödinger equation and of the uncertainty principle <span><math><mtext>ΔE · Δt = </mtext><mtext>h</mtext><mtext>̵</mtext></math></span>.</p><p>As a first step we will try to observe “diffraction in time” from a fast chopper with opening times (and repetition times) of about 2(6) × 10<sup>−8</sup>s. The spreading in travel time will be observed by a new high resolution time of flight spectrometer for 30 Å neutrons, which is currently under construction. With the nominal relative energy resolution of about 8 × 10<sup>−4</sup> we expect interferences in time from successive openings of the chopper. This can be regarded as the double slit experiment in time. In a later version it seems possible to achieve chopper frequencies close to matter wave frequencies of 200 Å neutrons.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 135-139"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90157-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90946766","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: 20
Does measurement reverse the direction of intrinsic time? 测量会改变固有时间的方向吗?
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90182-9
Iwo Bialynicki-Birula
{"title":"Does measurement reverse the direction of intrinsic time?","authors":"Iwo Bialynicki-Birula","doi":"10.1016/0378-4363(88)90182-9","DOIUrl":"10.1016/0378-4363(88)90182-9","url":null,"abstract":"<div><p>A new interpretation of the formula for transition probabilities in quantum theory is proposed, based on the relativistic version of the Feynman path integral. According to this interpretation both the transition amplitude and its complex conjugate are treated on equal footing. They differ only in having opposite directions of the intrinsic time. It is conjectured that both processes, the one that corresponds to the amplitude and the one that corresponds to the complex conjugate amplitude, are equally real and that they both take place in space-time. Every time a measurement occurs, the direction of the intrinsic time is reversed. In this formulation the dilemma faced by Schrödinger in 1926, which sign of i to choose in the wave equation, does not arise.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 302-305"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90182-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75875280","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
Significance of Aharonov-Bohm effect measurements Aharonov-Bohm效应测量的意义
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90201-X
Murray Peshkin
{"title":"Significance of Aharonov-Bohm effect measurements","authors":"Murray Peshkin","doi":"10.1016/0378-4363(88)90201-X","DOIUrl":"10.1016/0378-4363(88)90201-X","url":null,"abstract":"","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 384-385"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90201-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76975017","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
Neutron spin-pendellösung resonance 中子spin-pendellösung共振
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90165-9
Michael A. Horne , K.D. Finkelstein, C.G. Shull, Anton Zeilinger , Herbert J. Bernstein
{"title":"Neutron spin-pendellösung resonance","authors":"Michael A. Horne ,&nbsp;K.D. Finkelstein,&nbsp;C.G. Shull,&nbsp;Anton Zeilinger ,&nbsp;Herbert J. Bernstein","doi":"10.1016/0378-4363(88)90165-9","DOIUrl":"10.1016/0378-4363(88)90165-9","url":null,"abstract":"<div><p>A novel resonant enhancement of the spin-orbit scattering of thermal neutrons in a perfect crystal is predicted. The effect occurs when the Larmor precession distance for the neutron in an externally applied magnetic field coincides with the pendellösung distance in the crystal. The potential is described, the wave functions are derived, and an experiment is proposed.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 189-192"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90165-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78423240","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
Stochastic and deterministic attenuation of one beam in the neutron interferometer 中子干涉仪中一束的随机和确定性衰减
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90152-0
J. Summhammer, H. Rauch, D. Tuppinger
{"title":"Stochastic and deterministic attenuation of one beam in the neutron interferometer","authors":"J. Summhammer,&nbsp;H. Rauch,&nbsp;D. Tuppinger","doi":"10.1016/0378-4363(88)90152-0","DOIUrl":"https://doi.org/10.1016/0378-4363(88)90152-0","url":null,"abstract":"<div><p>Experiments are reported, where one of the beams inside the neutron interferometer was attenuated in three different ways: by partially absorbing gold or indium foils, by a slow beam chopper and by a fine cadmium lattice. When the attenuation was the same the different methods still had a different effect on the amplitude of the interference pattern. This counter intuitive result can be formally explained in a quantum mechanical analysis which nicely illuminates how the history of a neutron affects its wave function.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 103-107"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90152-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91756558","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: 12
Neutron interference and quantum measurement problems 中子干涉与量子测量问题
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90178-7
Mikio Namiki
{"title":"Neutron interference and quantum measurement problems","authors":"Mikio Namiki","doi":"10.1016/0378-4363(88)90178-7","DOIUrl":"10.1016/0378-4363(88)90178-7","url":null,"abstract":"<div><p>Physical implications of the neutron interference experiments are discussed from the viewpoint of the many-Hilbert-spaces theory of quantum measurements, which provides a definite criterion for measuring apparatus to give wave packet reduction. We stress that the neutron interference experiments serve for a counter test of quantum measurement theories.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 281-285"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90178-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79496252","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
Schrödinger's discovery of coherent states Schrödinger相干态的发现
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90187-8
F. Steiner
{"title":"Schrödinger's discovery of coherent states","authors":"F. Steiner","doi":"10.1016/0378-4363(88)90187-8","DOIUrl":"10.1016/0378-4363(88)90187-8","url":null,"abstract":"<div><p>Already in 1926, Schrödinger constructed “minimum uncertainty wave packets” for the harmonic oscillator, later popularized as “coherent states”, which today are widely used, for instance in quantum optics (laser theory) and in quantum field theory (infrared behaviour in QED and QCD). It is argued that Schrödinger's discovery of coherent states played a crucial role in Heisenberg's discovery of the uncertainty principle in 1927.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 323-326"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90187-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79594443","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
Information measures in quantum mechanics 量子力学中的信息测量
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90189-1
Evan Harris Walker
{"title":"Information measures in quantum mechanics","authors":"Evan Harris Walker","doi":"10.1016/0378-4363(88)90189-1","DOIUrl":"10.1016/0378-4363(88)90189-1","url":null,"abstract":"<div><p>This paper introduces an information operator specifying the rate of change of probability to obtain a modified Schrödinger equation (MSE) which provides automatic state vector collapse under the conditions of “complete measurement” interaction.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 332-338"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90189-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87801579","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
Perfect crystal neutron optics 完美晶体中子光学
Physica B+C Pub Date : 1988-07-01 Epub Date: 2002-10-09 DOI: 10.1016/0378-4363(88)90158-1
F. Eichhorn
{"title":"Perfect crystal neutron optics","authors":"F. Eichhorn","doi":"10.1016/0378-4363(88)90158-1","DOIUrl":"10.1016/0378-4363(88)90158-1","url":null,"abstract":"<div><p>Double crystal diffractometry is used for investigations in the field of neutron optics of perfect and nearly perfect crystals as well as for small-angle neutron scattering. It is demonstrated on the Si (220) reflection, that the structure factor for perfect crystal reflections can be determined with an accuracy of 0.1% by the simple inclination method. In implanted crystal slices the deformation of the crystal lattice near the implanted layer is investigated. Moreover, the change of this deformation field after light irradiation annealing is proved. Small-angle neutron scattering measurements in the momentum transfer range from 1 × 10<sup>−4</sup> nm<sup>−1</sup> to 0.5 nm<sup>−1</sup> are possible by using a double crystal diffractometer equipped with perfect or elastically bent crystals. Applying an analyser crystal in fully asymmetric geometry the angular dependence of the SANS intensity is transformed in a positional one, which enables us to employ a position-sensitive detector.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 140-146"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90158-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90074392","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
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