排序方式: 共有12条查询结果,搜索用时 31 毫秒
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Giovanni Baccolo Massimiliano Clemenza Barbara Delmonte Niccolò Maffezzoli Massimiliano Nastasi Ezio Previtali Michele Prata Andrea Salvini Valter Maggi 《Analytica chimica acta》2016
Dust found in polar ice core samples present extremely low concentrations, in addition the availability of such samples is usually strictly limited. For these reasons the chemical and physical analysis of polar ice cores is an analytical challenge. In this work a new method based on low background instrumental neutron activation analysis (LB-INAA) for the multi-elemental characterization of the insoluble fraction of dust from polar ice cores is presented. Thanks to an accurate selection of the most proper materials and procedures it was possible to reach unprecedented analytical performances, suitable for ice core analyses. The method was applied to Antarctic ice core samples. Five samples of atmospheric dust (μg size) from ice sections of the Antarctic Talos Dome ice core were prepared and analyzed. A set of 37 elements was quantified, spanning from all the major elements (Na, Mg, Al, Si, K, Ca, Ti, Mn and Fe) to trace ones, including 10 (La, Ce, Nd, Sm, Eu, Tb, Ho, Tm, Yb and Lu) of the 14 natural occurring lanthanides. The detection limits are in the range of 10−13–10−6 g, improving previous results of 1–3 orders of magnitude depending on the element; uncertainties lies between 4% and 60%. 相似文献
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C. Arnaboldi C. Brofferio A. Bryant C. Bucci L. Canonica S. Capelli M. Carrettoni M. Clemenza I. Dafinei S. Di Domizio F. Ferroni E. Fiorini Z. Ge A. Giachero L. Gironi A. Giuliani P. Gorla E. Guardincerri R. Kadel K. Kazkaz L. Kogler Y. Kolomensky J. Larsen M. Laubenstein Y. Li C. Maiano M. Martinez R. Maruyama S. Nisi C. Nones Eric B. Norman A. Nucciotti F. Orio L. Pattavina M. Pavan G. Pessina S. Pirro E. Previtali C. Rusconi Nicholas D. Scielzo M. Sisti Alan R. Smith W. Tian M. Vignati H. Wang Y. Zhu 《Journal of Crystal Growth》2010,312(20):2999-3008
High purity TeO2 crystals are produced to be used for the search for the neutrinoless double beta decay of 130Te. Dedicated production lines for raw material synthesis, crystal growth, and surface processing were built compliant with radio-purity constraints specific to rare event physics experiments. High sensitivity measurements of radio-isotope concentrations in raw materials, reactants, consumables, ancillaries, and intermediary products used for TeO2 crystals production are reported. Indications are given on the crystals perfection and how it is achieved and maintained in a large scale production process. Production and certification protocols are presented and resulting ready-to-use TeO2 crystals are described. 相似文献
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First measurement of the partial widths of 209Bi decay to the ground and to the first excited states
Beeman JW Biassoni M Brofferio C Bucci C Capelli S Cardani L Carrettoni M Clemenza M Cremonesi O Ferri E Giachero A Gironi L Gorla P Gotti C Nucciotti A Maiano C Pattavina L Pavan M Pessina G Pirro S Previtali E Sisti M Zanotti L 《Physical review letters》2012,108(6):062501
209Bi alpha decay to the ground and to the first excited state have been recently observed for the first time with a large BGO scintillating bolometer. The half-life of 209Bi is determined to be τ(1/2)=(2.01±0.08)×10(19) yr while the branching ratio for the ground-state to ground-state transition is (98.8±0.3)%. 相似文献
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G. Baccolo C. Baroni M. Clemenza B. Delmonte V. Maggi A. Motta M. Nastasi E. Previtali M. C. Salvatore 《Journal of Radioanalytical and Nuclear Chemistry》2014,299(3):1615-1623
The elemental composition of 40 samples of mineral sediments collected in Victoria Land, Antarctica, in correspondence of ice-free sites, is presented. Concentration of 36 elements was determined by instrumental neutron activation analysis, INAA. The selection of 6 standard reference materials and the development of a specific analytical procedure allowed to reduce measurements uncertainties and to verify the reproducibility of the results. The decision to analyze sediment samples from Victoria Land ice-free areas is related to recent investigations regarding mineral dust content in the TALos Dome ICE core (159°11′E; 72°49′S, East Antarctica, Victoria Land), in which a coarse local fraction of dust was recognized. The characterization of Antarctic potential source areas of atmospheric mineral dust is the first step to identify the active sources of dust for the Talos Dome area and to reconstruct the atmospheric pathways followed by air masses in this region during different climatic periods. Principal components analysis was used to identify elements and samples correlations; attention was paid specially to rare earth elements (REE) and incompatible/compatible elements (ICE) in respect to iron, which proved to be the most discriminating elemental groups. The analysis of REE and ICE concentration profiles supported evidences of chemical weathering in ice-free areas of Victoria Land, whereas cold and dry climate conditions of the Talos Dome area and in general of East Antarctica. 相似文献
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C. Bucci S. Capelli M. Carrettoni M. Clemenza O. Cremonesi L. Gironi P. Gorla C. Maiano A. Nucciotti L. Pattavina M. Pavan M. Pedretti S. Pirro E. Previtali M. Sisti 《The European Physical Journal A - Hadrons and Nuclei》2009,41(2):155-168
Large-mass bolometers are today extensively used for dark matter and double beta decay searches, in both cases the ultimate
experimental sensitivity is defined by the background level reached in such devices. The most common background sources and
the techniques used for their identification and reduction are here reviewed, with a particular focus on double beta decay
searches. The relevant role played by Monte Carlo simulations in this field is discussed. As a real case, the background optimization
in the MiDBD experiment is described. 相似文献
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O. Azzolini M. T. Barrera J. W. Beeman F. Bellini M. Beretta M. Biassoni E. Bossio C. Brofferio C. Bucci L. Canonica S. Capelli L. Cardani P. Carniti N. Casali L. Cassina M. Clemenza O. Cremonesi A. Cruciani A. D’Addabbo I. Dafinei S. Di Domizio F. Ferroni L. Gironi A. Giuliani P. Gorla C. Gotti G. Keppel M. Martinez S. Morganti S. Nagorny M. Nastasi S. Nisi C. Nones D. Orlandi L. Pagnanini M. Pallavicini V. Palmieri L. Pattavina M. Pavan G. Pessina V. Pettinacci S. Pirro S. Pozzi E. Previtali A. Puiu C. Rusconi K. Schäffner C. Tomei M. Vignati A. Zolotarova 《The European Physical Journal C - Particles and Fields》2018,78(11):888
The CUPID-0 experiment searches for double beta decay using cryogenic calorimeters with double (heat and light) read-out. The detector, consisting of 24 ZnSe crystals 95\(\%\) enriched in \(^{82}\)Se and two natural ZnSe crystals, started data-taking in 2017 at Laboratori Nazionali del Gran Sasso. We present the search for the neutrino-less double beta decay of \(^{82}\)Se into the 0\(_1^+\), 2\(_1^+\) and 2\(_2^+\) excited states of \(^{82}\)Kr with an exposure of 5.74 kg\(\cdot \)yr (2.24\(\times \)10\(^{25}\) emitters\(\cdot \)yr). We found no evidence of the decays and set the most stringent limits on the widths of these processes: \(\varGamma \)(\(^{82}\)Se \(\rightarrow ^{82}\)Kr\(_{0_1^+}\))8.55\(\times \)10\(^{-24}\) yr\(^{-1}\), \(\varGamma \) (\(^{82}\) Se \(\rightarrow ^{82}\) Kr \(_{2_1^+}\))\(\,{<}\,6.25 \,{\times }\,10^{-24}\) yr\(^{-1}\), \(\varGamma \)(\(^{82}\)Se \(\rightarrow ^{82}\)Kr\(_{2_2^+}\))8.25\(\times \)10\(^{-24}\) yr\(^{-1}\) (90\(\%\) credible interval). 相似文献
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M. Pavan C. Callegaro S. Capelli M. Carrettoni M. Clemenza L. Gironi P. Gorla C. Maiano C. Nones M. Pedretti 《The European Physical Journal A - Hadrons and Nuclei》2008,36(2):159-166
The problem of background reduction in bolometers used to search for ββ(0ν) is reviewed with particular emphasis on bulk and
surface radioactive contamination of the detectors. 相似文献
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O. Azzolini M. T. Barrera J. W. Beeman F. Bellini M. Beretta M. Biassoni C. Brofferio C. Bucci L. Canonica S. Capelli L. Cardani P. Carniti N. Casali L. Cassina M. Clemenza O. Cremonesi A. Cruciani A. D’Addabbo I. Dafinei S. Di Domizio F. Ferroni L. Gironi A. Giuliani P. Gorla C. Gotti G. Keppel M. Martinez S. Morganti S. Nagorny M. Nastasi S. Nisi C. Nones D. Orlandi L. Pagnanini M. Pallavicini V. Palmieri L. Pattavina M. Pavan G. Pessina V. Pettinacci S. Pirro S. Pozzi E. Previtali A. Puiu F. Reindl C. Rusconi K. Schäffner C. Tomei M. Vignati A. Zolotarova 《The European Physical Journal C - Particles and Fields》2018,78(5):428
The CUPID-0 detector hosted at the Laboratori Nazionali del Gran Sasso, Italy, is the first large array of enriched scintillating cryogenic detectors for the investigation of \(^{82}\)Se neutrinoless double-beta decay (\(0\nu \beta \beta \)). CUPID-0 aims at measuring a background index in the region of interest (RoI) for \(0\nu \beta \beta \) at the level of 10\(^{-3}\) counts/(keV kg years), the lowest value ever measured using cryogenic detectors. CUPID-0 operates an array of Zn\(^{82}\)Se scintillating bolometers coupled with bolometric light detectors, with a state of the art technology for background suppression and thorough protocols and procedures for the detector preparation and construction. In this paper, the different phases of the detector design and construction will be presented, from the material selection (for the absorber production) to the new and innovative detector structure. The successful construction of the detector lead to promising preliminary detector performance which is discussed here. 相似文献