Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Experiment may help size up neutrinos

19.03.2003


Our planet is bombarded every second with a large number of chargeless, seemingly massless, particles that originate in nuclear fusion reactions that power the sun. They’re called neutrinos.



According to The Standard Solar Model – the most substantiated model of the sun – the sun should emit around three times more neutrinos than are actually measured on Earth. They are a source of great interest for scientists who seek to better understand elementary particles and the physics of the sun. Indeed, one of the recipients of this year’s Nobel Prize in Physics was Raymond Davis, who first drew attention to the neutrino shortfall.

Three major research efforts (carried out by the underground large detector complexes at Sudbury Neutrino Observatory (SNO) in Canada, the U.S. National Underground Science Laboratory at Homestake and the Super-Kamikande in Japan ) have measured the number of neutrinos that actually reach Earth as a result of a specific reaction in the sun (thus the experiments are sensitive to only a small fraction of the solar neutrino spectrum). To better understand the shortfall of neutrinos on Earth, scientists have been trying to determine precisely how many neutrinos are emitted as a result of this reaction in the lab, so as to compare them with the number that actually reach Earth as measured by SNO, Kamiokande and Homestake.


However, mostly due to difficulties with the preparation and homogeneity of a central component in the reaction (the target made of the radioactive isotope of mass 7 of the beryllium element), large discrepancies persisted. The present experiment, conducted by Prof. Michael Hass of the Weizmann Institute’s Particle Physics Department, uses in a novel way a 2 mm diameter target of the beryllium 7 nuclei, prepared at the ISOLDE (CERN) laboratory and brought to the Van de Graaff accelerator of the Weizmann Institute, Israel, for the measurement of the reaction. The results of this measurement, with less than a 4% margin of error, may draw to a close this reaction’s standing as the largest source of error in the Standard Solar Model estimates of the measured neutrino flux.

Alex Smith | EurekAlert!
Further information:
http://www.weizmann.ac.il/

More articles from Physics and Astronomy:

nachricht Innovative LED High Power Light Source for UV
22.06.2017 | Omicron - Laserage Laserprodukte GmbH

nachricht Spin liquids − back to the roots
22.06.2017 | Universität Augsburg

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

Im Focus: Optoelectronic Inline Measurement – Accurate to the Nanometer

Germany counts high-precision manufacturing processes among its advantages as a location. It’s not just the aerospace and automotive industries that require almost waste-free, high-precision manufacturing to provide an efficient way of testing the shape and orientation tolerances of products. Since current inline measurement technology not yet provides the required accuracy, the Fraunhofer Institute for Laser Technology ILT is collaborating with four renowned industry partners in the INSPIRE project to develop inline sensors with a new accuracy class. Funded by the German Federal Ministry of Education and Research (BMBF), the project is scheduled to run until the end of 2019.

New Manufacturing Technologies for New Products

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

A new technique isolates neuronal activity during memory consolidation

22.06.2017 | Life Sciences

Plant inspiration could lead to flexible electronics

22.06.2017 | Materials Sciences

A rhodium-based catalyst for making organosilicon using less precious metal

22.06.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>