andrea pocar

UMass Amherst physicist Andrea Pocar

AMHERST, Mass. – College of Massachusetts Amherst physicist Andrea Pocar is among the global staff of experts a short while ago awarded the European Actual physical Society’s Giuseppe and Vanna Cocconi Prize. The team, regarded as the Borexino Collaboration, has spent additional than a ten years unlocking the tricks of how the sunshine creates its electrical power. The Cocconi prize goes to scientists who have produced “an superb contribution to particle astrophysics and cosmology in the previous fifteen decades, in an experimental, theoretical or technological location.”

The Borexino Collaboration was awarded the Cocconi prize “for their ground-breaking observation of solar neutrinos from the proton-proton and carbon-nitrogen-oxygen chains that offered special and complete exams of the solar as a nuclear fusion motor.” These measurements had been manufactured doable by an instrument known as the Borexino detector, which is buried half a mile beneath the Apennine Mountains in Italy. The detector features a giant nylon balloon, practically 30 feet throughout, stuffed with 300 tons of an extremely-pure aromatic hydrocarbon. The balloon is itself housed in a 45-foot diameter, spherical vessel loaded with a equivalent hydrocarbon and surrounded by extremely-pure water.

The Borexino detector is able of sensing minimal-electrical power neutrinos emitted by stars. Neutrinos are subatomic particles that are difficult to measure, but vital simply because, states Pocar, they are the only immediate probe experts have for examining the main of stars. Although 400 billion of them hit every single sq. inch of the Earth each individual second of the day, most neutrinos go completely through the earth with no interacting with anything.



The Borexino Detector. Picture courtesy: Andrea Pocar

The Borexino detector is a single of the couple devices both of those huge ample and delicate sufficient to detect this kind of particles, which present up as temporary flashes of gentle when they hit the detector.

Borexino has operate because 2007 and steps the total composition of the photo voltaic neutrino spectrum in great element. The project started in the early 90s. A single of the team’s milestones was the first snapshot of the full spectrum of neutrinos emitted by the sun’s proton-proton, or pp chain. Extra just lately, Borexino identified that the carbon-nitrogen-oxygen cycle, or CNO cycle, is also at do the job in our sun. This was the initial time that the CNO cycle experienced been directly observed.

Pocar has been with the Borexino Collaboration for a lot more than 20 several years, because his graduate university student times, and was a member of the workforce that built and constructed the detector’s nylon balloon and the fluid-handling procedure. “It’s very fascinating to acquire this recognition from the EPS and to be a part of these highly regarded researchers who have been awarded the Cocconi prize for particle astrophysics,” he says. “The Borexino experiment is genuinely an extraordinary scientific experience, which has set a new normal in ultra-low qualifications, unusual event physics. My UMass learners and I have contributed to some of the essential analyses that have allowed us to extract the feeblest and most affordable strength solar neutrino signals.”

Borexino is an intercontinental collaboration and is supported by the Nationwide Science Basis in the US, as well as the Italian Nationwide Institute for Nuclear Physics (INFN), and funding agencies in Germany, Russia and Poland.