Results from the Cuore Experiment Caminata, Alessio; Adams, Douglas; Alduino, Chris ...
Universe (Basel),
01/2019, Letnik:
5, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector ...consists of an array of 988 TeO 2 crystals arranged in a cylindrical compact structure of 19 towers, each of them made of 52 crystals. The construction of the experiment was completed in August 2016 and the data taking started in spring 2017 after a period of commissioning and tests. In this work we present the neutrinoless double beta decay results of CUORE from examining a total TeO 2 exposure of 86.3 kg yr , characterized by an effective energy resolution of 7.7 keV FWHM and a background in the region of interest of 0.014 counts / ( keV kg yr ) . In this physics run, CUORE placed a lower limit on the decay half-life of neutrinoless double beta decay of 130 Te > 1.3 · 10 25 yr (90% C.L.). Moreover, an analysis of the background of the experiment is presented as well as the measurement of the 130 Te 2 ν β β decay with a resulting half-life of T 1 / 2 2 ν = 7.9 ± 0.1 ( stat . ) ± 0.2 ( syst . ) × 10 20 yr which is the most precise measurement of the half-life and compatible with previous results.
Background and Objective Post-traumatic nerve repair is still a challenge for rehabilitation. It is particularly important to develop clinical protocols to enhance nerve regeneration. The present ...study investigated the effects of 660 and 780nm low-level laser therapy (LLLT) using different energy densities (10, 60, and 120J/cm2) on neuromuscular and functional recovery as well as on matrix metalloproteinase (MMP) activity after crush injury in rat sciatic nerve. Materials and Methods Rats received transcutaneous LLLT irradiation at the lesion site for 10 consecutive days post-injury and were sacrificed 28 days after injury. Both the sciatic nerve and tibialis anterior muscles were analyzed. Nerve analyses consisted of histology (light microscopy) and measurements of myelin, axon, and nerve fiber cross-sectional area (CSA). S-100 labeling was used to identify myelin sheath and Schwann cells. Muscle fiber CSA and zymography were carried out to assess the degree of muscle atrophy and MMP activity, respectively. Statistical significance was set at 5% (P<=0.05). Results Six hundred sixty nanometer LLLT either using 10 or 60J/cm2 restored muscle fiber, myelin and nerve fiber CSA compared to the normal group (N). Furthermore, it increased MMP-2 activity in nerve and decreased MMP-2 activity in muscle and MMP-9 activity in nerve. In contrast, 780nm LLLT using 10J/cm2 decreased MMP-9 activity in nerve compared to the crush group (CR) and N; it also restored normal levels of myelin and nerve fiber CSA. Both 60 and 120J/cm2 decreased MMP-2 activity in muscle compared to CR and N. 780nm did not prevent muscle fiber atrophy. Functional recovery in the irradiated groups did not differ from the non-irradiated CR. Conclusion Data suggest that 660nm LLLT with low (10J/cm2) or moderate (60J/cm2) energy densities is able to accelerate neuromuscular recovery after nerve crush injury in rats. Lasers Surg. Med. 42:673-682, 2010 ? 2010 Wiley-Liss, Inc.
The GERmanium Detector Array (Gerda) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0vββ) of sup.76Ge. Germanium detectors made of material with an ...enriched sup.76Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of the experiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new sup.76Ge enriched detectors of broad energy germanium (BEGe) type were produced. A subgroup of these detectors has already been deployed in Gerda during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the sup.76Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of Gerda Phase II.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A search for neutrinoless
β
β
decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the ...Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices
n
=
1
,
2
,
3
,
7
were searched for. No signals were found and lower limits of the order of 10
23
yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with
76
Ge. A new result for the half-life of the neutrino-accompanied
β
β
decay of
76
Ge with significantly reduced uncertainties is also given, resulting in
T
1
/
2
2
ν
=
(
1.926
±
0.094
)
×
10
21
yr.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The GERmanium Detector Array (
Gerda
) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (
0
ν
β
β
) of
76
Ge. Germanium detectors made of material with ...an enriched
76
Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of theexperiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new
76
Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in
Gerda
during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the
76
Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of
Gerda
Phase II.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
In order to supply warning discharge lamps installed atop towers, the insulation of ground wires in HV and EHV can be used. The paper describes a simplified yet efficient matrix procedure which ...allows both to compute the capacitive induced voltages and to determine the equivalent circuit supplying such non-linear loads. In addition, the waveform of the conduction currents and voltages and the average power on the lamps are determined by a fast analytical procedure. The analytical results have been compared with laboratory experimental results giving a really good agreement.
This paper aims at investigating the impact of the increasing demand for electricity on the power quality of the transmission networks. In particular, investigations on the transmission network ...structure as a source of voltage unbalance are made by performing numerical simulations. All the simulations are carried out by means of the MCA method, and by means of a novel three-phase power flow algorithm named as PFPD_3P. Moreover, proposals and discussions on possible power quality mitigation strategies on the transmission networks are presented (i.e., synchronous compensators installations and/or network reinforcements).
A rápida perda de qualidade pós-colheita limita a comercialização da nêspera no mercado de frutas frescas. Neste sentido, este trabalho teve por objetivo avaliar os efeitos da utilização de atmosfera ...modificada na conservação pós-colheita da nêspera 'Fukuhara' armazenada sob refrigeração (1 °C / 90% UR). Para tanto, os frutos (≈450 g) foram acondicionados em bandejas de poliestireno e embalados em dois tipos de filme: polietileno de baixa densidade (PEBD, 50 µm) e polipropileno (PP, 30 µm), sendo, em seguida, armazenados a 1 °C / 90% UR. Os frutos foram comparados a um controle que não envolveu a aplicação de filmes. As análises físico-químicas (perda de massa, firmeza, sólidos solúveis, pH e acidez titulável) foram realizadas aos 15, 30 e 45 dias sob refrigeração, seguido por período de três dias sob condição ambiente (25 °C / 80% UR). A composição gasosa (O2/CO2) no espaço livre das embalagens, a incidência de podridões e de manchas escuras na epiderme dos frutos também foram avaliadas. Os resultados mostraram que a utilização de filme PEBD e PP para a conservação pós-colheita da nêspera, apesar de ser eficaz na redução da perda de massa e não alterar a cidez titulável, o pH e a firmeza dos frutos, não é indicada para o aumento do período de conservação, pois deprecia sua qualidade devido a condições de anaerobiose e elevada incidência de podridões.
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