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SUMMARY:Neutron Cross Sections: Linking the Lab to the Cosmos
DTSTART:20260415T090000Z
DTEND:20260415T100000Z
DTSTAMP:20260430T231200Z
UID:indico-event-17614@indico.global
DESCRIPTION:Speakers: Michael Bacak (TU Wien\, Atominstitut)\n\n"In the ea
 rly days of the Manhattan Project when an unknown cross section was requir
 ed\, the procedure for obtaining a value was straightforward. One would ap
 proach Fermi and request a guess. Invariably he would decline to hazard a 
 guess. The next step\, as the story goes\, was to recite a lengthy sequenc
 e of numbers and if one produced a gleam in Fermi’s eye that was the val
 ue to use."\nH. Goldstein (talk at Atomenergie\, Sweden\, September 1953)\
 n \nIn a post-Fermi era\, we prefer and endeavour to measure neutron-indu
 ced cross-section data. Neutron cross-sections are directly requested in m
 any subfields of physics and applications ranging from nuclear astrophysic
 s to nuclear technology and medicine.\n \nCERN’s neutron time-of-flight
  (n_TOF) facility is dedicated to high-precision measurements of neutron r
 eaction cross-sections across a neutron spectrum from meV to GeV. Since 25
  years the facility has produced unique high-quality neutron data-sets for
  nuclear astrophysics\, nuclear technologies and medicine as well as funda
 mental research. Two particular physics cases were studied directly relate
 d to cosmology: the Re-Os nuclear clock and the lithium problem. Two other
  examples related to galactic nucleosynthesis\, galactic evolution and our
  understanding of star formation are the direct and for the first time 26A
 l and 41Ca (n\,a) reaction cross-section measurements. \n \nBeyond that\
 , when designing experiments and analysing their data\, neutrons can be a 
 major background component in rare event searches detector activation and 
 radiation damage. Two ongoing projects aim to improve neutron data on Argo
 n for the DUNE collaboration or on Oxygen for Hyper-Kamiokande which will 
 enhance the accuracy of their Monte-Carlo simulations.\n \nDespite almost
  100 years since the discovery of the neutron 1932\, improvements in techn
 ologies and modelling tools\, drive the request for new and more precise m
 easurements of neutron cross-sections\, ultimately assisting the improveme
 nt of our understanding of physics in different ways.\n \n\nhttps://indic
 o.global/event/17614/
LOCATION:Besprechungsraum (PSK 3.OG)
URL:https://indico.global/event/17614/
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