The sample environment group has published a detailed technical handbook on the BENSC sample environment. Sample environment for high pressures and high temperatures is equally available and presently an advanced and highly specialised instrumentation for adsorption experiments is being built up. A special emphasis is put on high magnetic fields and low and ultra low temperatures. An up-to-date description of the BENSC neutron scattering instrumentation can be found on the BENSC webpages: instrumentation_en.html An updated colour-printed instrument brochure will be available on request later in It replaces the brochure HMI-B 577 from March BENSC has an outstanding tradition in providing sample environment for extreme conditions. A part of the beam time for external users (up to 20% of the total beam time of an instrument) can be given to long term collaborating groups from German universities and other research institutions, the rest (at least 50% of the total beam time) is given to short term projects via a peer-review selection process. About 70% of the beam time is available to external users, 30% to in-house researchers. BENSC User Service BENSC is open to the national and international scientific community. The diffractometer E6 was not scheduled for user operation in 2005, because of severe detector problems. Two out of 14 user instruments could not be operated in 2005 (reflectometer V6 and spin-echo spectrometer V5), because the cold neutron guide 4 had to be replaced in connection with the important upgrade project of BENSC, the Neutron Guide Hall II. The neutron experiments performed at BENSC are described by 173 reports from external users and 44 from BENSC staff members. A complete coverage, however, is intended in the near future, when the administrative structures for incorporating the user service at these five instruments into BENSC will be fully developed. The 15 synchrotron reports included represent only a small part of the experiments performed. Hans-Anton Graf Hahn-Meitner-Institut in der Helmholtz-Gemeinschaft Glienicker Strasse 100 D Berlin Phone:, FAX: Net:Ĥ CONTENTS Introduction List of BENSC Instruments How to apply for BENSC Beam Time Acknowledgement for Support by the European Commission List of Contributed Reports IV VII XII XIII XV Part I: EXPERIMENTAL REPORTS 2005 Magnetism 1 Magnetic Structure and Phase Transitions 1 Magnetic Excitations 46 Structure 56 Chemical Structure 56 Structural Excitations 75 Biology & Soft Matter 86 Biology 86 Soft Matter 100 Material Science 115 Structures and Phases 115 Nanostructures 119 Stress Analysis 130 Cultural Heritage 143 Fundamental Physics and Others 155 Development of Instruments and Methods 157 BESSY 172 Part II: LIST OF BENSC PUBLICATIONS Theses 196 Papers 2005 (and Supplement 2004, 2003, 2001) 197 Conference Contributions, Seminar Talks and Posters 207 Contributions to the BENSC Users Meeting AUTHOR INDEX 223ĥ Introduction The present volume of the Experimental Reports gives an overview on the research performed with neutrons at BENSC during the year In addition starting with this volume we have also included reports on experiments performed with synchrotron radiation at the five HMI- BENSC instruments of BESSY, the Berlin Synchrotron Radiation Source. Address: Berlin Neutron Scattering Center BENSC The Scientific Secretary Dr. The Hahn-Meitner-Institut Berlin in der Helmholtz-Gemeinschaft (HMI) is a national research institution financed by the Federal Republic of Germany and the City State of Berlin. BENSC develops and runs the Neutron Scattering Instruments at the Berlin Research Reactor BER II and is responsible for the service to external users. The cover was designed by screenworks, Leibnizstraße 59, Berlin, Editorial: The Berlin Neutron Scattering Center (BENSC) is a department of the Hahn-Meitner-Institut Berlin GmbH. Further details are given in the experimental report EF p. Beside the conventional acoustic phonon branch originating from the Brillouin zone center, a phason mode is observed which is centered at an incommensurate wave vector and produced by a charge-density wave. Graf Berlin Neutron Scattering Center Hahn-Meitner-Institut Berlin in der Helmholtz Gemeinschaft Juni 2006 Berichte des Hahn-Meitner-Instituts Berlin HMI - B 607 ISSNģ Cover pictures: Phonon anomalies in the martensitic phase of Ni 2 MnGa The cover picture shows the acoustic phonon dispersion in the martensite phase of the ferromagnetic shape-memory alloy Ni 2 MnGa. 2 BENSC EXPERIMENTAL REPORTS 2005 edited by K.
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