Neutron total cross section measurements of gold and tantalum at the nELBE photoneutron source

Neutron total cross sections of $^{197}$Au and $^\text{nat}$Ta have been measured at the nELBE photoneutron source in the energy range from 0.1 - 10 MeV with a statistical uncertainty of up to 2 % and a total systematic uncertainty of 1 %. This facility is optimized for the fast neutron energy range and combines an excellent time structure of the neutron pulses (electron bunch width 5 ps) with a short flight path of 7 m. Because of the low instantaneous neutron flux transmission measurements of neutron total cross sections are possible, that exhibit very different beam and background conditions than found at other neutron sources.Comment: article (18 pages, 10 figures, 2 tables) with attached data tables (13 pages

Coulomb dissociation of N 20,21

Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N20,21 are reported. Relativistic N20,21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N19(n,γ)N20 and N20(n,γ)N21 excitation functions and thermonuclear reaction rates have been determined. The N19(n,γ)N20 rate is up to a factor of 5 higher at

Coulomb dissociation of O-16 into He-4 and C-12

We measured the Coulomb dissociation of O-16 into He-4 and C-12 within the FAIR Phase-0 program at GSI Helmholtzzentrum fur Schwerionenforschung Darmstadt, Germany. From this we will extract the photon dissociation cross section O-16(alpha,gamma)C-12, which is the time reversed reaction to C-12(alpha,gamma)O-16. With this indirect method, we aim to improve on the accuracy of the experimental data at lower energies than measured so far. The expected low cross section for the Coulomb dissociation reaction and close magnetic rigidity of beam and fragments demand a high precision measurement. Hence, new detector systems were built and radical changes to the (RB)-B-3 setup were necessary to cope with the high-intensity O-16 beam. All tracking detectors were designed to let the unreacted O-16 ions pass, while detecting the C-12 and He-4

Foreign-owned firms as agents of structural change in regions

This paper investigates the role of different types of firms in related and unrelated diversification in regions, in particular the extent to which foreign-owned firms induce structural change in the manufacturing capability base of 67 Hungarian regions between 2000 and 2009. Doing so, it connects more tightly the literatures of evolutionary economic geography and international business. The results indicate that foreign-owned firms deviate more from the region's average capability match than domestic-owned firms. However, this deviation is larger on the short run than in the long run, and more pronounced in peripheral regions and in the capital region.publishedVersio

Smarta diversifieringsmöjligheter i Värmland, Dalarna och Gävleborg

Denna rapport har utifrån nuvarande forskning om smart specialisering identifierat Värmlands, Dalarnas och Gävleborgs näringslivsstruktur och hur verksamheterna i respektive region är kopplade till varandra ur ett kompetensperspektiv. Detta är en central utgångspunkt för att utifrån nuvarande situation kunna förstå framtida utvecklingsmöjligheter utifrån de möjligheter regionernas arbetskraft har att kunna använda sina kompetenser i nya verksamheter. Vi har kunnat visa att alla tre regioner utgörs av tydliga och relativt övriga riket väldigt koherenta kunskapskluster där Dalarna sticker ut som en region med en tydligt sammansatt kompetensstruktur (bara Stockholm har i genomsnitt högre grad av inbäddade specialiseringar). Dock är komplexiteten i alla dessa tre regioner, framförallt i Dalarna och Gävleborg, relativt låg vilket indikerar att många av regionernas specialiseringar är relativt generiska och återfinns i många andra regioner.  Detta speglar också regionernas diversifieringspotential. Regionerna delar till stor del befintliga specialiseringar, och därmed också potentiella diversifieringsmöjligheter. Det är i huvudsak byggverksamheter, tillverkning av konstfiber och betong som utgör diversifieringsmöjligheter utifrån existerande strukturer. Några tydliga undantag är tekniskt konsultverksamhet och arkitekter samt arkiv i Dalarna och teknisk analys i Värmland som alla är något mer kunskapsintensiva verksamheter som också delar kompetenser med många av de redan befintliga specialiseringarna i regionerna

Nuclear structure and decay data evaluation in Europe

Nuclear Structure and Decay Data (NSDD) activities in Europe include mass-chain and individual nuclei evaluations as well as horizontal evaluations and compilations, data dissemination and educational activities. As such they are essential for a large range of applications from energy, environmental, and medical to basic research in nuclear structure and reactions, all of which are intensively pursued in Europe. Although the NSDD evaluation groups in Europe form part of the international network of NSDD evaluators, which is coordinated by the International Atomic Energy Agency, they are faced with some very distinct challenges. We shortly present the NSDD Data Centre at IFIN-HH, Bucharest and discuss possible actions to improve the situation for the entire European NSDD evaluation effort

Nuclear structure and decay data evaluation in Europe

Nuclear Structure and Decay Data (NSDD) activities in Europe include mass-chain and individual nuclei evaluations as well as horizontal evaluations and compilations, data dissemination and educational activities. As such they are essential for a large range of applications from energy, environmental, and medical to basic research in nuclear structure and reactions, all of which are intensively pursued in Europe. Although the NSDD evaluation groups in Europe form part of the international network of NSDD evaluators, which is coordinated by the International Atomic Energy Agency, they are faced with some very distinct challenges. We shortly present the NSDD Data Centre at IFIN-HH, Bucharest and discuss possible actions to improve the situation for the entire European NSDD evaluation effort

Nuclear structure and decay data evaluation in Europe

Nuclear Structure and Decay Data (NSDD) activities in Europe include mass-chain and individual nuclei evaluations as well as horizontal evaluations and compilations, data dissemination and educational activities. As such they are essential for a large range of applications from energy, environmental, and medical to basic research in nuclear structure and reactions, all of which are intensively pursued in Europe. Although the NSDD evaluation groups in Europe form part of the international network of NSDD evaluators, which is coordinated by the International Atomic Energy Agency, they are faced with some very distinct challenges. We shortly present the NSDD Data Centre at IFIN-HH, Bucharest and discuss possible actions to improve the situation for the entire European NSDD evaluation effort

NeuLAND: The high-resolution neutron time-of-flight spectrometer for R3B at FAIR

NeuLAND (New Large-Area Neutron Detector) is the next-generation neutron detector for the R3B (Reactions with Relativistic Radioactive Beams) experiment at FAIR (Facility for Antiproton and Ion Research). NeuLAND detects neutrons with energies from 100 to 1000 MeV, featuring a high detection efficiency, a high spatial and time resolution, and a large multi-neutron reconstruction efficiency. This is achieved by a highly granular design of organic scintillators: 3000 individual submodules with a size of 5 × 5 × 250 cm3 are arranged in 30 double planes with 100 submodules each, providing an active area of 250 × 250 cm2 and a total depth of 3 m. The spatial resolution due to the granularity together with a time resolution of 150 ps ensures high-resolution capabilities. In conjunction with calorimetric properties, a multi-neutron reconstruction efficiency of 50% to 70% for four-neutron events will be achieved, depending on both the emission scenario and the boundary conditions allowed for the reconstruction method. We present in this paper the final design of the detector as well as results from test measurements and simulations on which this design is based