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A dedicated geoneutrino detector for geosciences would exploit the deep-penetrating properties of neutrinos, which make this radiation in the decay of the heat producing elements ideally suited for investigating the deep interior of the Earth relative to conventional radiometric methods employing alpha-, beta- and gamma rays.
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Card 1 · A reference Earth model for the heat producing elements and associated geoneutrino flux
The recent geoneutrino experimental results from KamLAND and Borexino detectors reveal the usefulness of analyzing the Earth geoneutrino flux, as it provides a constraint on the strength of the radiogenic heat power and this, in turn, provides a test of compositional models of the bulk silicate Eart…
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The recent geoneutrino experimental results from KamLAND and Borexino detectors reveal the usefulness of analyzing the Earth geoneutrino flux, as it provides a constraint on the strength of the radiogenic heat power and this, in turn, provides a test of compositional models of the bulk silicate Earth (BSE). This flux is dependent on the amount and distribution of heat producing elements (HPEs: U, Th and K) in the Earth interior. We have developed a geophysically-based, three-dimensional global reference model for the abundances and distributions of HPEs in the BSE. The structure and composition of the outermost portion of the Earth, the crust and underlying lithospheric mantle, is detailed in the reference model, this portion of the Earth has the greatest influence on the geoneutrino fluxes. The reference model combines three existing geophysical models of the global crust and yields an average crustal thickness of 34.4+-4.1 km in the continents and 8.0+-2.7 km in the oceans. In situ s …
Card 2 · Reference Models for Lithospheric Geoneutrino Signal
Abstract Debate continues on the amount and distribution of radioactive heat producing elements (i.e., U, Th, and K) in the Earth, with estimates for mantle heat production varying by an order of magnitude. Constraints on the bulk‐silicate Earth's (BSE) radiogenic power also places constraints on ov…
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Abstract Debate continues on the amount and distribution of radioactive heat producing elements (i.e., U, Th, and K) in the Earth, with estimates for mantle heat production varying by an order of magnitude. Constraints on the bulk‐silicate Earth's (BSE) radiogenic power also places constraints on overall BSE composition. Geoneutrino detection is a direct measure of the Earth's decay rate of Th and U. The geoneutrino signal has contributions from the local ( 40%) and global ( 35%) continental lithosphere and the underlying inaccessible mantle ( 25%). Geophysical models are combined with geochemical data sets to predict the geoneutrino signal at current and future geoneutrino detectors. We propagated uncertainties, both chemical and physical, through Monte Carlo methods. Estimated total signal uncertainties are on the order of 20%, proportionally with geophysical and geochemical inputs contributing 30% and 70%, respectively. We find that estimated signals, calculated using CRUST2.0, CRUS …
Card 3 · Comprehensive geoneutrino analysis with Borexino
This paper presents a comprehensive geoneutrino measurement using the Borexino detector, located at Laboratori Nazionali del Gran Sasso (LNGS) in Italy.The analysis is the result of 3262.74 days of data between December 2007 and April 2019.The paper describes improved analysis techniques and optimiz…
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This paper presents a comprehensive geoneutrino measurement using the Borexino detector, located at Laboratori Nazionali del Gran Sasso (LNGS) in Italy.The analysis is the result of 3262.74 days of data between December 2007 and April 2019.The paper describes improved analysis techniques and optimized data selection, which includes enlarged fiducial volume and sophisticated cosmogenic veto.The reported exposure of ð1.29 Æ 0.05Þ × 10 32 protons × year represents an increase by a factor of two over a previous Borexino analysis reported in 2015.By observing 52.6 þ9.4 -8.6 ðstatÞ þ2.7 -2.1 ðsysÞ geoneutrinos (68% interval) from 238 U and 232 Th, a geoneutrino signal of 47.0 þ8.4 -7.7 ðstatÞ þ2.4 -1.9 ðsysÞ TNU with þ18.3 -17.2 % total precision was obtained.This result assumes the same Th/U mass ratio as found in chondritic CI meteorites but compatible results were found when contributions from 238 U and 232 Th were both fit as free parameters.Antineutrino background from reactors is fit u …
Card 4 · Considerations For a Dedicated Geoneutrino Detector For Geosciences
A combination of several sources including: radiogenic heating, processes of mantle and core formation and differentiation, delayed radiogenic heating, earthquakes, and tidal friction account for the surface heat flux in the Earth. Radiogenic heating is of much interest in various fields of geoscien…
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A combination of several sources including: radiogenic heating, processes of mantle and core formation and differentiation, delayed radiogenic heating, earthquakes, and tidal friction account for the surface heat flux in the Earth. Radiogenic heating is of much interest in various fields of geosciences. Inferences from recent experiments with reactor antineutrinos and solar neutrinos showed that the age of geoneutrinos is at hand for constraining radiogenic heat. Because of the deep penetrating properties of the neutrinos this type of radiation in the decay of the heat producing elements (HPE) is ideally suited for the investigation of the deep interiors of the Earth compared to conventional radiometric methods for HPE employing alpha-, beta- and gamma rays. This presentation will address the considerations for a dedicated geoneutrino detector to be set up for investigating the interior regions all the way to the center of the Earth.
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Card 4 · fact
Affected output: A dedicated geoneutrino detector for geosciences would exploit the deep-penetrating properties of neutrinos, which make this radiation in the decay of the heat producing elements ideally suited for investigating the deep interior of the Earth relative to conventional radiometric methods employing alpha-, beta- and gamma rays.
Model explanation: The row supplied the concrete rationale for a dedicated geoscience detector—deep-penetrating neutrino radiation from HPE decay versus conventional radiometric methods—which the paragraph otherwise lacked.