Low energy analysis techniques for CUORE Alduino, C.; Avignone, F. T.; Azzolini, O. ...
The European physical journal. C, Particles and fields,
12/2017, Letnik:
77, Številka:
12
Journal Article
Recenzirano
Odprti dostop
CUORE is a tonne-scale cryogenic detector operating at the Laboratori Nazionali del Gran Sasso (LNGS) that uses tellurium dioxide bolometers to search for neutrinoless double-beta decay of
130
Te. ...CUORE is also suitable to search for low energy rare events such as solar axions or WIMP scattering, thanks to its ultra-low background and large target mass. However, to conduct such sensitive searches requires improving the energy threshold to 10 keV. In this paper, we describe the analysis techniques developed for the low energy analysis of CUORE-like detectors, using the data acquired from November 2013 to March 2015 by CUORE-0, a single-tower prototype designed to validate the assembly procedure and new cleaning techniques of CUORE. We explain the energy threshold optimization, continuous monitoring of the trigger efficiency, data and event selection, and energy calibration at low energies in detail. We also present the low energy background spectrum of CUORE-0 below
60
keV
. Finally, we report the sensitivity of CUORE to WIMP annual modulation using the CUORE-0 energy threshold and background, as well as an estimate of the uncertainty on the nuclear quenching factor from nuclear recoils inCUORE-0.
Studies were carried out in Brazil to study the inheritance of tolerance to Zucchini yellow mosaic virus (ZYMV) in cucumber cv. Formosa. This cultivar was individually crossed with two cucumber lines ...from different varietal types (Lb from a Brazilian type, and Lj from a Japanese type), both susceptible to the virus. Two experiments, one for each line, were separately carried out, where 6 treatments (parents, generations FI, F2 and F1BC1 for both parents) were evaluated in a randomized block design with 5 repetitions. Cotyledons of 2-week-old cucumber seedlings were inoculated with ZYMV. Only the plants that did not show symptoms up to 63 days post inoculation were considered as tolerant. A chi-square (X²) analysis for assessing segregation from F2 and both F1BC1, led to the conclusion that the tolerance found in cv. Formosa is determined by a recessive gene.
Abstract
The addition of two unsymmetric malonate esters to the Buckminster fullerene C
60
can lead to 22 spectroscopically distinguishable isomeric products and therefore represents a formidable ...synthesis challenge. In this work, we achieve 87 % selectivity for the formation of a single (
in
,
out
‐
trans
‐3) isomer by combining three approaches: (i) we use a starting material, in which the two malonates are covalently connected (tether approach); (ii) we form the strong supramolecular complex of C
60
with the shape‐persistent 10CPP macrocycle (template approach) and (iii) we embed this complex further within a self‐assembled nanocapsule (shadow mask approach). Variation of the spacer chain shed light on the limitations of the approach and the ring dynamics in the unusual 2catenanes were studied in silico with atomistic resolution. This work significantly widens the scope of mechanically interlocked architectures comprising cycloparaphenylenes (CPP).
Localization and modeling of radioactive contaminations is a challenge that ultra-low background experiments are constantly facing. These are fundamental steps both to extract scientific results and ...to further reduce the background of the detectors. Here we present an innovative technique based on the analysis of
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delayed coincidences in
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U decay chains, developed to investigate the contaminations of the ZnSe crystals in the CUPID-0 experiment. This method allows to disentangle surface and bulk contaminations of the detectors relying on the different probability to tag delayed coincidences as function of the
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The common practice for liming no-tillage consists of applying dolomite to soil surface without incorporation into the soil by plowing. The effectiveness of surface application of lime to oxisols ...under no-tillage, particularly with regard to subsoil acidity, is uncertain.
A field experiment was conducted from 1986 to 1991 in the State of Paraná, Brazil, to evaluate the extent of downward movement of dolomite and phosphogypsum in an acid soil profile under a no-tillage system, and the effect on soybean yields. The experimental treatments were: control (no amendments), surface dolomite, incorporated dolomite (0–20 cm), surface phosphogypsum, surface
1
2
dolomine (half of the lime requirement) plus surface
1
2
phosphogypsum (half of the phosphogypsum requirement), and surface
1
4
dolomine (one-quarter of the lime requirement applied per year over 4 years). The following results were obtained: a significant reduction in Al and increase in Ca and Mg because of increased pH were measured about 40 cm deep when dolomite is surface applied; the effects of surface dolomite on the acid soil chemistry were essentially the same as those produced by incorporated dolomite; surface phosphogypsum had no effect on pH, increased Ca and decreased Mg; combining phosphogypsum with dolomite improved the soil fertility levels; soybean yields increased with surface and incorporated dolomite, phosphogypsum plus dolomite, and surface
1
4
dolomite annually; and soybean yields decreased with single application of phosphogypsum. It was concluded that for a no-tillage system, surface applied dolomite was effective in improving the fertility of an acid soil below the point of placement, and increased soybean grain yields.
•Fabrication of Al-Ga-Pd-Mn icosahedral film via specific co-sputtering strategy.•Icosahedral phase stabilized in a narrow temperature (350–450 °C) window.•Well-define crake-free quasicrystal ...surfaces trigger many surface related applications.
Growth of Al–Pd–Mn–Ga quasicrystalline thin film is hindered by the low melting temperature of Ga (30 °C) and the formation of residual binary phases. In this study, a stable icosahedral film with a composition near Al67.5Pd19Mn7.5Ga5.7 has been achieved using the co-sputtering of Al64.9Pd20.7Mn8.4Ga6 and Al materials followed by ex-situ annealing. The increase in the 6d lattice parameter from 6.45 to 6.48 Å of icosahedral phases suggested that Ga (+1) successfully replaced Al(+3) in the composition. The temperature-dependent XRD study (from RT to 700 °C) reveals that the icosahedral phase found only in a narrow temperature window of 350 – 450 °C. Interestingly, Al63Pd18Mn7.5Ga6 quasicrystalline thin film exhibits cluster spin glass behaviour due to spin-spin interaction of localized Mn ions. These stable icosahedral thin films with crack-free well-defined surfaces can be useful for potential surface-related applications.
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