摘要:

If the reader senses a certain evangelistic undertone running through these pages, he will have perceived accurately the intent of the author. I have recently undergone a very stimulating experience, receiving from it certain enlightenment, and I now hope to find converts willing to share both in the experience and the enlightenment.

ISSN:0031-9228    

DOI:10.1063/1.3051363

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

“(Atomic Energy of Canada Limited recommends) that the Chalk River 5 million volt (MV) tandem accelerator be replaced by…a tandem accelerator of advanced design, capable of operating with 10 MV on the terminal. “This will provide precisely‐controlled heavy‐ion beams of much greater energy and intensity than the present accelerator, e.g., bromine ions of 160 MeV, more energetic than the fastest fission fragments. The High Voltage Engineering Corporation (HVEC) has carried out the basic design and is prepared to build such a machine, the MP II Tandem, and to guarantee reliable operation at 10 MV…”

ISSN:0031-9228    

DOI:10.1063/1.3051364

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

It is often possible to make a clear division between pure and applied physics, although at times the dividing line is indistinct. Seldom has the distinction been so completely blurred as it is in those areas of research related to optical masers, or lasers. In this field new advances in devices and techniques immediately make possible new experiments of fundamental importance. New scientific knowledge is very quickly translated into new devices.

ISSN:0031-9228    

DOI:10.1063/1.3051365

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

The Sixth General Assembly and International Congress of the International Union of Crystallography, which convened in Rome during the period from September 9 to 18, 1963, was a far cry from the first Congress of the Union which was held at Harvard University from July 28 to August 3, 1948. The Union actually had been founded two summers earlier at a conference held in London in 1946. The first and sixth meetings form an interesting study in contrasts. At that delightful first Congress, there was a total of about 85 papers presented, including a few invited addresses. Everyone gave his own paper. Actually, there was ample time for this personal presentation. While there were some joint sessions, these occurred only on two mornings of the six‐day meeting and the conflicts were not serious. By way of contrast, at the Sixth Congress there were somewhat more than five hundred papers grouped under 21 different topics and at times as many as five simultaneous sessions. Another aspect of the most recent Congress, one which markedly influenced its general character, was the almost universal application of the rapporteur system. This system had been initiated three years earlier at the 1960 meeting in Cambridge, England, and, while it had been only partly successful there, it had been hoped that the experience gained in Cambridge would lead to a more successful application of the rapporteur system at the larger meeting in Rome. Alas, these hopes were not realized. After having faithfully attended every session possible, this reporter felt that scientifically the meeting was almost a complete loss as far as he was concerned. No paper, as discussed by a rapporteur, made a vivid impression on him. It is unfortunately true that the use of the rapporteur system removes any personal contact between the author of a scientific work and the audience. There was naturally a wide range in the quality of the reports by the rapporteurs; some of them quite obviously had not taken their assignments seriously and did poor jobs. A few had worked very hard but, despite their most valiant efforts, the impact of the research being described could simply not come through.

ISSN:0031-9228    

DOI:10.1063/1.3051366

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

Forty papers were presented in two and one‐half days at the symposium on problems and methods in crystallographic computing, and this was a welcome change of pace from the rapporteured sessions of the previous week. With a few exceptions, the papers were concerned with programming for various aspects of crystal‐structure analysis. General‐purpose machines were invariably used, ranging from the IBM 1620 class to the ATLAS at Manchester.

ISSN:0031-9228    

DOI:10.1063/1.3051367

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

Because of the proximity of the International Conference on Lattice Dynamics in Copenhagen from August 5 to 9, Symposium III of the Rome meeting in September was designed, not as an opportunity for presentation of the latest results in the field of lattice dynamics, but rather as an elementary course to give the average crystallographer an understanding of the types of problems which have been solved and those being studied now, the techniques which have been used and those showing the greatest promise at present. The speakers could hardly have been better chosen for this task, and there was, as a result, general agreement on the great success of the symposium

ISSN:0031-9228    

DOI:10.1063/1.3051369

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

For most crystallographers, the twin problems of how to measure integrated intensities accurately and how to measure them quickly are of daily concern. An open session of the IUCr Commission on Crystallographic Apparatus, called specifically to discuss these problems, provided a high point of the Sixth Congress. This session contained six invited papers, followed by a vigorous informal discussion held with less rigid attention to time than most other sessions.

ISSN:0031-9228    

DOI:10.1063/1.3051370

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

To him who, in the love of nature, finds occasion to investigate, say, the nuclear properties of europium‐152, nature offers a variety of approaches. The two lowest states have half‐lives of 13 years and 9.3 hours, so their decay properties can be conveniently studied. Further, these states live long enough to be subjected to atomic‐beam, isotope‐shift, isomer‐shift, mass‐spectrometer, and cross‐section experiments, and some such studies have been reported. Higher levels inEu152can be studied via neutron capture gamma rays and neutron resonances. They can also be studied through reactions, such asEu151(d,p),Eu153(d,t),orSm149(&agr;,p).

ISSN:0031-9228    

DOI:10.1063/1.3051371

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

Until 1953 it was not known that more than one allotrope of helium existed. In that year Dugdale and Simon reported the existence of two solid forms ofHe4.These are the &agr; and &bgr; forms in Fig. 1. Then in 1961 Vignos and Fairbank showed that a third solid phase,&ggr;‐He4,existed in a narrow region along the melting curve. At the Los Alamos Scientific Laboratory the three allotropic forms ofHe3shown in the figure were discovered. The structures of all these solid phases have been found by x‐ray and neutron diffraction studies and are listed in Table 1.

ISSN:0031-9228    

DOI:10.1063/1.3051372

出版商:AIP    

年代:1964

数据来源: AIP

摘要:

What are the leading problems of quantum physics today? Where does reduction of the wave‐packet occur? Why single‐valued wave functions? To what extent have relativity theory and quantum theory really been united consistently? Does it make sense to speak of “quantum mechanical action at a distance”? What is the significance of electromagnetic potentials in the quantum domain? What does a leading quantum physicist have to say about the physicist's picture of nature?

ISSN:0031-9228    

DOI:10.1063/1.3051373

出版商:AIP    

年代:1964

数据来源: AIP