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SUMMARY:The East Lansing Model: Towards uncertainty-quantified optical pot
 entials for rare isotopes
DTSTART:20251124T100000Z
DTEND:20251124T110000Z
DTSTAMP:20260913T111400Z
UID:indico-event-11979@indico.ijclab.in2p3.fr
CONTACT:chloe.hebborn@ijclab.in2p3.fr
DESCRIPTION:Speakers: Kyle Beyer (FRIB/MSU)\n\nOptical potentials are ubiq
 uitous ingredients in nuclear reaction analysis\, as they effectively redu
 ce the many-body degrees of freedom to an effective few between reacting b
 odies. In applications involving nucleon-nucleus optical potentials\, this
  effective interaction is typically obtained by a phenomenological fit to 
 elastic scattering cross sections. Such global phenomenological models hav
 e the limitation that the available experimental data to constrain them pr
 imarily comes from neutron and proton beams on stable targets. To describe
  reactions involving species away from beta-stability\, with large neutron
 -proton asymmetry\, these models are extrapolated\, typically without any 
 uncertainty quantification (UQ). Recently\, work has begun to address this
  lack of UQ using a Bayesian statistical approach. We present the first re
 sults of the East Lansing Model (ELM)\; a global\, phenomenological\, UQ'e
 d\, nucleon-nucleus optical potential\, developed for extrapolating off of
  the line of beta-stability towards rare isotopes with controlled uncertai
 nties. We discuss the choices made in 1) curating a corpus of experimental
  evidence from EXFOR including differential cross sections and analyzing p
 owers for (n\,n) and (p\,p) elastic scattering\, and for (p\,n) to the iso
 baric analog state on a variety of targets\, 2) developing a functional fo
 rm for the physical model\, 3) developing a model for the likelihood that 
 the physical model describes the evidence\, and\, finally\, 4) performing 
 a Bayesian calibration of the model.  Finally\, we demonstrate the perfo
 rmance of ELM compared to the state-of-the-art\, highlighting unique featu
 res of ELM\, especially with regards to its isovector component\, which go
 verns the (N-Z)/A dependence.\n\nhttps://indico.ijclab.in2p3.fr/event/1197
 9/
LOCATION:100/2-A201 - Salle A201 (IJCLab)
URL:https://indico.ijclab.in2p3.fr/event/11979/
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