scholarly journals Cosmogenic activation: Recent results

2018 ◽  
Author(s):  
Vitaly A. Kudryavtsev
Keyword(s):  
Cosmogenic Activation

scholarly journals Study of cosmogenic activation in copper for rare event search experiments

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Ze She ◽  
Zhi Zeng ◽  
Hao Ma ◽  
Qian Yue ◽  
Mingkun Jing ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Rare Event ◽  
Background Level ◽  
Germanium Detectors ◽  
Production Rates ◽  
Background Estimation ◽  
Gamma Ray Spectrometer ◽  
Detector Structure ◽  
Cosmogenic Activation ◽  
The Impact

AbstractRare event search experiments using germanium detectors are performed in underground laboratories to minimize the background induced by cosmic rays. However, the cosmogenic activation of cupreous detector components on the ground generates long half-life radioisotopes and contributes to the background level. We measured cosmogenic activation with 142.50 kg of copper bricks after 504 days of exposure at an altitude of 2469.4 m outside the China Jinping Underground Laboratory (CJPL). The specific activities of the cosmogenic nuclides produced in the copper bricks were measured using a low-background germanium gamma-ray spectrometer at CJPL. The production rates at sea level, in units of nuclei/kg/day, were $${18.6 \pm 2.0}$$ 18.6 ± 2.0 for $${^{54}}$$ 54 Mn, $${9.9 \pm 1.3}$$ 9.9 ± 1.3 for $${^{56}}$$ 56 Co, $${48.3 \pm 5.5}$$ 48.3 ± 5.5 for $${^{57}}$$ 57 Co, $${51.8 \pm 2.5}$$ 51.8 ± 2.5 for $${^{58}}$$ 58 Co, and $${39.7 \pm 5.7}$$ 39.7 ± 5.7 for $${^{60}}$$ 60 Co. The measurement will help to constrain cosmogenic background estimation for rare event searches using copper as a detector structure and shielding material. Based on the measured production rates, the impact of the cosmogenic background in cupreous components of germanium detectors on the next generation CDEX-100 experiment was assessed with the expected exposure history above ground.

scholarly journals Cosmogenic Activation in Double Beta Decay Experiments

Universe ◽  
2020 ◽  
Vol 6 (10) ◽  
pp. 162
Author(s):  
Susana Cebrián
Keyword(s):  
Cosmic Rays ◽  
Beta Decay ◽  
Double Beta Decay ◽  
Nuclear Process ◽  
Different Types ◽  
Deep Underground ◽  
Cosmogenic Activation ◽  
Materials Used ◽  
Set Up ◽  
Copper Lead

Double beta decay is a very rare nuclear process and, therefore, experiments intended to detect it must be operated deep underground and in ultra-low background conditions. Long-lived radioisotopes produced by the previous exposure of materials to cosmic rays on the Earth’s surface or even underground can become problematic for the required sensitivity. Here, the studies developed to quantify and reduce the activation yields in detectors and materials used in the set-up of these experiments will be reviewed, considering target materials like germanium, tellurium and xenon together with other ones commonly used like copper, lead, stainless steel or argon. Calculations following very different approaches and measurements from irradiation experiments using beams or directly cosmic rays will be considered for relevant radioisotopes. The effect of cosmogenic activation in present and future double beta decay projects based on different types of detectors will be analyzed too.

Fiducial Volume of the Edelweiss Germanium Bolometers for Dark Matter Search Using Cosmogenic Activation

2012 ◽  
Vol 167 (5-6) ◽  
pp. 1154-1159
Author(s):  
J. Domange ◽  
◽  
E. Armengaud ◽  
A. Broniatowski ◽  
G. Gerbier
Keyword(s):  
Dark Matter ◽  
Dark Matter Search ◽  
Fiducial Volume ◽  
Cosmogenic Activation

scholarly journals Cosmogenic activation of materials

2017 ◽  
Vol 32 (30) ◽  
pp. 1743006 ◽  
Author(s):  
Susana Cebrián
Keyword(s):  
Cosmic Rays ◽  
Cross Sections ◽  
Direct Detection ◽  
Production Cross ◽  
Cosmic Ray ◽  
Double Beta Decay ◽  
Radioactive Isotopes ◽  
Isotope Production ◽  
Deep Underground ◽  
Cosmogenic Activation

Experiments looking for rare events like the direct detection of dark matter particles, neutrino interactions or the nuclear double beta decay are operated deep underground to suppress the effect of cosmic rays. But, the production of radioactive isotopes in materials due to previous exposure to cosmic rays is a hazard when ultra-low background conditions are required. In this context, the generation of long-lived products by cosmic nucleons has been studied for many detector media and for other materials commonly used. Here, the main results obtained on the quantification of activation yields on the Earth’s surface will be summarized, considering both measurements and calculations following different approaches. The isotope production cross-sections and the cosmic ray spectrum are the two main ingredients when calculating this cosmogenic activation; the different alternatives for implementing them will be discussed. Activation that can take place deep underground mainly due to cosmic muons will be briefly commented too. Presently, the experimental results for the cosmogenic production of radioisotopes are scarce and discrepancies between different calculations are important in many cases, but the increasing interest on this background source which is becoming more and more relevant can help to change this situation.

scholarly journals Measurement of the cosmogenic activation of germanium detectors in EDELWEISS-III

2017 ◽  
Vol 91 ◽  
pp. 51-64 ◽  
Author(s):  
E. Armengaud ◽  
Q. Arnaud ◽  
C. Augier ◽  
A. Benoît ◽  
L. Bergé ◽  
...  
Keyword(s):  
Germanium Detectors ◽  
Cosmogenic Activation

scholarly journals Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment

2018 ◽  
Vol 62 (1) ◽  
Author(s):  
JingLu Ma ◽  
Qian Yue ◽  
ShinTed Lin ◽  
Henry Tsz-King Wong ◽  
JinWei Hu ◽  
...  
Keyword(s):  
Germanium Detectors ◽  
Cosmogenic Activation
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