scholarly journals Study of the cosmogenic activation in NaI(Tl) crystals within the ANAIS experiment

2018 ◽  
Vol 33 (09) ◽  
pp. 1843006 ◽  
Author(s):  
P. Villar ◽  
J. Amaré ◽  
S. Cebrián ◽  
I. Coarasa ◽  
E. García ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Direct Detection ◽  
Production Rates ◽  
Low Background ◽  
Term Operation ◽  
Entire Energy Range ◽  
Set Up ◽  
Selection Of

The direct detection of galactic dark matter particles requires ultra-low background conditions. NaI(Tl) crystals are applied in the search for these dark matter particles through their interactions in the detector by measuring the scintillation signal produced. The production of long-lived isotopes in materials due to the exposure to cosmic rays on Earth’s surface can be an hazard for these ultra-low background demanding experiments, typically performed underground. Therefore, production rates of cosmogenic isotopes in all the materials present in the experimental set-up, as well as the corresponding cosmic rays exposure history, must be both well-known in order to assess the relevance of this effect in the achievable sensitivity of a given experiment. Here, analysis of the cosmogenic studies developed from the ANAIS experiment NaI(Tl) detectors are presented. Installed inside a convenient shielding at the Canfranc Underground Laboratory just after finishing surface exposure to cosmic rays and thanks to the prompt data taking developed, identification and quantification of isotopes with half-lives of the order of tens of days were allowed, and thanks to the long-term operation of the detectors long-lived isotopes have been also identified and quantified. Main results for the activation yields of iodine and tellurium isotopes, [Formula: see text]Na, [Formula: see text]Sn, [Formula: see text]Cd, and tritium are presented in this work, together with the estimate of the production rates for their activation by cosmic nucleons while on Earth’s surface based on a selection of excitation functions over the entire energy range of cosmic nucleons.

DARK MATTER SEARCH WITH GAMMA RAYS: THE EXPERIMENTS EGRET AND GLAST

2002 ◽  
Vol 17 (12n13) ◽  
pp. 1829-1840 ◽  
Author(s):  
ALDO MORSELLI
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Minimal Supersymmetric Standard Model ◽  
Gamma Rays ◽  
Galactic Center ◽  
Direct Detection ◽  
Model Parameters ◽  
Dark Matter Search

The direct detection of annihilation products in cosmic rays offers an alternative way to search for supersymmetric dark matter particles candidates. The study of the spectrum of gamma-rays, antiprotons and positrons offers good possibilities to perform this search in a significant portion of the Minimal Supersymmetric Standard Model parameters space. In particular the EGRET team have seen a convincing signal for a strong excess of emission from the galactic center that have not easily explanation with standard processes. We will review the achievable limits with the experiment GLAST taking into accounts the LEP results and we will compare this method with the antiproton and positrons experiments, the direct underground detection and with future experiments at LHC.

Characterization of Thick Film Technology for 300°C Packaging

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000097-000107 ◽  
Author(s):  
Rui Zhang ◽  
R. Wayne Johnson ◽  
Vinayak Tilak ◽  
Tan Zhang ◽  
David Shaddock
Keyword(s):  
Thick Film ◽  
Analog Circuits ◽  
Passive Components ◽  
Term Operation ◽  
C Storage ◽  
Selection Of ◽  
Device Technology ◽  
Thick Film Technology

Geothermal well logging and instrumentation applications require electronics capable of 300°C operation. SiC device technology enables the design and fabrication of analog circuits that can operate at these temperatures. However, to build functional circuits, an interconnection and packaging technology must be demonstrated to provide interconnectivity between different SiC devices and passive components. For long-term operation, organic based packaging is limited to ∼250°C with careful selection of materials. Thick film technology based on ceramics and metals has potential for higher operating temperatures. In this work the effect of 300°C storage on the adhesion of different thick film Au conductors and a multilayer dielectric have been studied. In addition, the electrical properties of the dielectric have been studied as a function of temperature and of high temperature aging. Assembly technologies: component attach, wire bonding and external lead attach have also been investigated and the results are reported.

Towards the next and far future

2016 ◽  
Vol 31 (31) ◽  
pp. 1642011
Author(s):  
R. Bernabei ◽  
P. Belli ◽  
A. Incicchitti ◽  
R. Cerulli ◽  
C. J. Dai ◽  
...  
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Low Background ◽  
The Future ◽  
Far Future

The DAMA project has realized and is developing many experiments in the field of Dark Matter direct detection, and in the search for many other rare processes by developing and using a wide choice of low background scintillators at the Laboratori Nazionali del Gran Sasso (LNGS) of the I.N.F.N. Thus, DAMA covers from pioneer to future aspects and can offer many other new results in the future.

scholarly journals How to Improve Meat Quality and Welfare in Entire Male Pigs by Genetics

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 699
Author(s):  
Catherine Larzul
Keyword(s):  
Meat Quality ◽  
Sexual Development ◽  
Genomic Data ◽  
Boar Taint ◽  
New Developments ◽  
Set Up ◽  
Near Future ◽  
Entire Male ◽  
Selection Of

Giving up surgical castration is desirable to avoid pain during surgery but breeding entire males raises issues on meat quality, particularly on boar taint, and aggression. It has been known for decades that boar taint is directly related to sexual development in uncastrated male pigs. The proportion of tainted carcasses depends on many factors, including genetics. The selection of lines with a low risk of developing boar taint should be considered as the most desirable solution in the medium to long term. It has been evidenced that selection against boar taint is feasible, and has been set up in a balanced way in some pig populations to counterbalance potential unfavorable effects on reproductive performances. Selection against aggressive behaviors, though theoretically feasible, faces phenotyping challenges that compromise selection in practice. In the near future, new developments in modelization, automatic recording, and genomic data will help define breeding objectives to solve entire male meat quality and welfare issues.

scholarly journals CRESST Detectors for Nonbaryonic Cold Dark Matter Particles

2004 ◽  
Vol 220 ◽  
pp. 493-494 ◽  
Author(s):  
Thomas Jagemann
Keyword(s):  
Dark Matter ◽  
Energy Deposition ◽  
Cold Dark Matter ◽  
Detection Method ◽  
Direct Detection ◽  
Weakly Interacting Massive Particles ◽  
Dark Matter Halo ◽  
Interaction Cross Section ◽  
Set Up ◽  
Crucial Parameter

The CRESST experiment is set up for the direct detection of Weakly Interacting Massive Particles (WIMPs) which our Galactic dark matter halo possibly consists of. the employed detection method is elastic scattering by nuclei. the recoiling nucleus deposits most of its energy in the form of lattice vibrations in the detector. Cooling the detector to very low temperatures (mK) enhances the temperature rise due to the energy deposition. the crucial parameter for direct WIMP searches is the sensitivity to the WIMP interaction cross section in a certain range of possible WIMP masses. CRESST is now sensitive enough to explore the parameter space predicted by supersymmetric models.

Selection of Sound Insulating Elements in Hydraulic Excavators Based Onidentification of Vibroacoustic Energy Propagation Paths

2013 ◽  
Vol 38 (4) ◽  
pp. 471-478 ◽  
Author(s):  
Zbigniew Dąbrowski ◽  
Jacek Dziurdź ◽  
Radosław Pakowski
Keyword(s):  
Energy Propagation ◽  
Term Operation ◽  
Measuring Procedure ◽  
Hydraulic Excavators ◽  
Propagation Paths ◽  
Selection Of

Abstract In spite of the fact that standardizing operations and increased awareness of hazards led to a significant improvement of vibroacoustic climate of operator’s stands of new machines, their long-term operation - often under difficult conditions - leads to a fast degradation of acoustic qualities of machines. Temporary operations performed during surveys and periodical overhauls are rarely effective, due to the lack of any guidelines. In this situation the authors propose the algorithm for selection of eventual screens or sound absorbing and sound insulating partitions, utilizing the measuring procedure aimed at identification, at the operator’s stand, of main noise components originated from various sources. On the basis of this procedure, the vibroacoustic energy propagation paths in the machine was estimated.

SEARCH FOR DAEMONS WITH NEMESIS

2012 ◽  
Vol 27 (08) ◽  
pp. 1250031 ◽  
Author(s):  
R. BERNABEI ◽  
P. BELLI ◽  
F. CAPPELLA ◽  
R. CERULLI ◽  
A. D'ANGELO ◽  
...  
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Cosmic Rays ◽  
Sea Level ◽  
Wide Class ◽  
Direct Detection ◽  
Detection Approach

The DAEMONs (DArk Electric Matter Objects) have been suggested as a possible exotic component in cosmic rays able to contribute to the Dark Matter; they belong to the wide class of the Elementary Black Holes (EBH) deeply discussed in literature. A preliminary possible DAEMONs direct detection, at ≃3σ C.L., was originally suggested by the sea-level St. Petersburg experiment (SPb); a DAEMONs flux: (1.0±0.3) DAEMONs/(days m2 sr) can be derived. Here the results obtained by the sea-level NEMESIS experiment, which has exploited the same detection approach, are presented; they restrict the DAEMONs flux to be less than 0.32 DAEMONs/(days m2 sr) at 90% C.L.

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