摘要:

Laboratory after nearly 30 years of neutron scattering research. Brookhaven organized a symposium to honor John for his significant contributions t o condensed matter science, the neutron scattering community, Brook-haven and the Department of Energy.

ISSN:1044-8632    

DOI:10.1080/10448639908233657

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

We describe novel, compact optical elements for collimating and/or focusing beams of slow neutrons. These optical elements are solid composites consisting of regular stacks of alternating micro-foils analogous in action to Soller slits. They are made out of pairs of metals with suitable refractive indices for reflection and/or absorption of the radiation. The performance of these proof-in-principle collimating elements is limited only by the choice of microfoil materials and uniformity of their interfaces.

ISSN:1044-8632    

DOI:10.1080/10448639908233658

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Square-channel capillary, or “Lobster-Eye” arrays, have been shown to be the optimum geometry for array optics. This configuration leads to a novel class of conditioning devices for X-ray and neutron beams. We present the first results of the focusing of neutrons with a lead glass square-channel array. This array designed for soft X-rays performs comparably with neutrons.

ISSN:1044-8632    

DOI:10.1080/10448639908233659

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Ref.[1] highlights the usage of multiple small-angle scattering (MSAS) technique to characterize inhomogeneities which are inaccessible to conventional smallangle scattering measurements under the single scattering approximation. Multiple scattering in the context of scattering experiments has so far been perceived largely to be something of a nuisance value which should be avoided, if possible. But the point that the beam broadening feature' of multiple scattering can also be exploited to study large inhomogeneities was not quite appreciated. The authors [l] attempted to bring home the aforementioned aspects of multiple scattering with some experimental data on ceramics, thanks to their accessibility to an advanced small-angle neutron scattering (SANS) instrument. They have tried to interpret the data by a scheme based on a theory [2] put forward by one of the authors (N.F. Berk) in 1985. But it is worth considering all the subsequent developments pertaining to MSAS. In the following lines, we intend to outline some of the recent developments.

ISSN:1044-8632    

DOI:10.1080/10448639908233660

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

We regret that Mazumder and Sequeira do not feel we gave their work recognition in our Neutron News article [1]. We considered that the purpose of this brief Scientific Review was to summarize our own work in this field. and place it in the context of the ongoing experimental research of ourselves and our collaborators. Clearly, such a brief article cannot be a comprehensive review of the multiple small-angle neutron scattering (MSANS) field.

ISSN:1044-8632    

DOI:10.1080/10448639908233661

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Some 10 years ago closed all-carbon molecules (fullerenes) were observed for the first time experimentally. a discovery awarded the Nobel prize for chemistry in 1996. A few years after the first identification of isolated fullerenes. a production process was discovered yielding macroscopic quantities of C60and C70, the two most stable members of the family. This opened the door for the investigation of the solid state properties [1] in which both elastic and inelastic neutron scattering (INS) have played a vital role right from the start.

ISSN:1044-8632    

DOI:10.1080/10448639908233662

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Pekka Hiismäki World Scientific © 1997 177 pp.

ISSN:1044-8632    

DOI:10.1080/10448639908233663

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:1044-8632    

DOI:10.1080/10448639908233664

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor