24 research outputs found
Development of Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search
We report recent achievements in the development of scintillating bolometers to search for neutrinoless double-beta decay of Mo. The presented results have been obtained in the framework of the LUMINEU, LUCIFER and EDELWEISS collaborations, and are now part of the R\&D activities towards CUPID (CUORE Update with Particle IDentification), a proposed next-generation double-beta decay experiment based on the CUORE experience. We have developed a technology for the production of large mass (1 kg), high optical quality, radiopure zinc and lithium molybdate crystal scintillators (ZnMoO and LiMoO, respectively) from deeply purified natural and Mo-enriched molybdenum. The procedure is applied for a routine production of enriched crystals. Furthermore, the technology of a single detector module consisting of a large-volume (~cm) ZnMoO and LiMoO scintillating bolometer has been established, demonstrating performance and radiopurity that are close to satisfy the demands of CUPID. In particular, the FWHM energy resolution of the detectors at 2615 keV --- near the -value of the double-beta transition of Mo (3034~keV) --- is 4--10~keV. The achieved rejection of -induced dominant background above 2.6~MeV is at the level of more than 99.9\%. The bulk activity of Th (Th) and Ra in the crystals is below 10 Bq/kg. Both crystallization and detector technologies favor LiMoO, which was selected as a main element for the realization of a CUPID demonstrator (CUPID-0/Mo) with 7 kg of Mo
Resonance laser ionization of atoms for nuclear physics
The applications of the laser resonance ionization method in nuclear research are reviewed. Investigation of radioactive isotopes using resonance ionization techniques provides a valuable combination of high selectivity, efficiency and spectral resolution. The majority of radioactive ion beams produced at on-line isotope separator facilities profit from the selectivity and universal applicability of laser ion sources. Numerous ultra-sensitive and high-resolution techniques of laser spectroscopy based on resonance ionization of atoms have been developed for the study of rare and radioactive isotopes. A summary of ionization schemes applied to radioactive isotopes is given in table form. © 2012 The Royal Swedish Academy of Sciences.status: publishe
Fourier-Type Series with Integer Coefficients in Systems of Contractions and Shifts of a Single Function in Spaces Lp, p ≥ 1
Production and study of heavy neutron rich nuclei formed in multi-nucleon transfer reactions
A new setup is proposed to produce and investigate heavy neutron-rich nuclei located along the neutron closed shell N = 126. This "blank spot" of the nuclear map can be reached neither in fusion-fission reactions nor in fragmentation processes widely used nowadays for the production of exotic nuclei. The present limits of the upper part of the nuclear map are very close to stability while the unexplored area of heavy neutron-rich nuclides along the neutron closed shell N = 126 is extremely important for nuclear astrophysics investigations and, in particular, for the understanding of the r-process of astrophysical nucleosynthesis. A new way was recently proposed for the production of these nuclei via low-energy multi-nucleon transfer reactions. The estimated yields of neutron-rich nuclei are found to be rather high in such reactions and several tens of new nuclides can be produced, for example, in the near-barrier collision of 136Xe with 208Pb. This setup could definitely open a new opportunity in the studies at heavy-ion facilities and will have significant impact on future experiments. © 2013 Springer Science+Business Media Dordrecht.status: publishe
Evaluation of the Residual Life of a Pipe of Oil Pipeline with an External Surface Stress-Corrosion Crack for a Laminar Flow of Oil with Repeated Hydraulic Shocks
Patterns on the Fish Skins Induced by Anisotropy in Diffusion (Interfaces, Pulses and Waves in Nonlinear Dissipative Systems : RIMS Project 2000 "Reaction-diffusion systems : theory and applications")
The EURECA (European Underground Rare Event Calorimeter Array) project is aimed at searching for dark matter particles using cryogenic bolometers. The proponents of the present project have decided to pool their strengths and expertise to build a facility to house up to 1000 kg of detectors, EURECA, consisting in the first instance of germanium and CaWO 4 crystals. The shielding will be provided through a large water tank in which the cryostat with detectors will be immersed. The EURECA infrastructure will be an essential tool for the community interested in using cryogenic detectors for dark matter searches. Beyond European detectors, it will be designed to host other types of similar cryogenic detectors, requiring millikelvin operating temperatures. In particular, this includes the germanium detectors currently in use by the SuperCDMS team, following the current collaborative work performed by the EURECA and SuperCDMS collaborations. EURECA will have two stages. The first phase aims at a sensitivity of 3 . 10 −10 pb and will involve building the infrastructure, cryostat and shielding, and operating 150 kg of detectors. The second phase will be completed with 850 kg of additional detectors, the relative weight between the different detectors being decided by the collaboration according to the physics reach. A sensitivity of 2 . 10 −11 pb is aimed for at the second stage. EURECA will ideally benefit from the planned extension of the deepest underground laboratory in Europe – LSM. With a site-independent design, it can also be hosted in other locations at similar or deeper sites such as SNOLAB