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1.
Appl Radiat Isot ; 68(4-5): 643-6, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20096595

RESUMO

In 2002, an innovative neutron time-of-flight facility started operation at CERN: n_TOF. The main characteristics that make the new facility unique are the high instantaneous neutron flux, high resolution and wide energy range. Combined with state-of-the-art detectors and data acquisition system, these features have allowed to collect high accuracy neutron cross-section data on a variety of isotopes, many of which radioactive, of interest for Nuclear Astrophysics and for applications to advanced reactor technologies. A review of the most important results on capture and fission reactions obtained so far at n_TOF is presented, together with plans for new measurements related to nuclear industry.


Assuntos
Terapia por Captura de Nêutron/instrumentação , Terapia por Captura de Nêutron/métodos , Reatores Nucleares , Desenho de Equipamento , Análise de Falha de Equipamento , Nêutrons , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
2.
Phys Rev Lett ; 94(12): 121301, 2005 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-15903903

RESUMO

Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field ("axion helioscope"), they would be transformed into x-rays with energies of a few keV. Using a decommissioned Large Hadron Collider test magnet, the CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axion-photon coupling g(agamma)<1.16x10(-10) GeV-1 at 95% C.L. for m(a) less, similar 0.02 eV. This limit, assumption-free, is comparable to the limit from stellar energy-loss arguments and considerably more restrictive than any previous experiment over a broad range of axion masses.

3.
Phys Rev Lett ; 93(16): 161103, 2004 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-15524972

RESUMO

The151Sm(n,gamma)152Sm cross section has been measured at the spallation neutron facility n_TOF at CERN in the energy range from 1 eV to 1 MeV. The new facility combines excellent resolution in neutron time-of-flight, low repetition rates, and an unsurpassed instantaneous luminosity, resulting in rather favorable signal/background ratios. The 151Sm cross section is of importance for characterizing neutron capture nucleosynthesis in asymptotic giant branch stars. At a thermal energy of kT=30 keV the Maxwellian averaged cross section of this unstable isotope (t(1/2)=93 yr) was determined to be 3100+/-160 mb, significantly larger than theoretical predictions.

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