BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-4692
DTSTART:20180503T193000Z
DURATION:PT1H0M0S
DTSTAMP:20260309T184522Z
LAST-MODIFIED:20180413T135658Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Fission and the formation of the r-process rare-earth abundanc
 e peak in neutron star mergers\, NPAC (Nuclear/Particle/Astro/Cosmo) F
 orum\, Nicole Vassh\, University of Notre Dame
DESCRIPTION:The recent observations of the GW170817 electromagnetic co
 unterpart<br>
\nsuggest lanthanides were produced in this neutron star
  merger event.<br>
\nHowever many questions regarding heavy element pr
 oduction in mergers<br>
\nremain: can such events account for all the 
 r-process lanthanide material<br>
\nobserved in the galaxy? are precio
 us metals such as gold produced in<br>
\nsufficient amounts? are actin
 ides produced? where within the merger<br>
\nenvironment does nucleosy
 nthesis occur and under what specific conditions?<br>
\nSuch questions
  can only be answered with careful studies of the nuclear<br>
\nphysic
 s uncertainties affecting r-process calculations. Here I will<br>
\ndi
 scuss recent extended calculations of beta-delayed fission and their<b
 r>
\nimplications for r-process nucleosynthesis. The influence of fiss
 ion<br>
\nfragment distributions will also be addressed with a particu
 lar emphasis<br>
\non the unknown origin of the r-process rare-earth p
 eak at A~164. Since the<br>
\nrare-earth peak is formed as the r-proce
 ss path begins to draw closer to<br>
\nstability\, the rare-earth nucl
 ei contributing to peak formation will soon<br>
\nbe within reach of n
 uclear physics experiments performed at\, for example\,<br>
\nthe CPT 
 at CARIBU and the upcoming FRIB. Here I will present the latest<br>
\n
 results for the masses found to produce the rare-earth peak in a low<b
 r>
\nentropy accretion disk wind scenario and compare directly with re
 cent mass<br>
\nmeasurements from the CPT at CARIBU. Such collaborativ
 e efforts between<br>
\ntheory and experiment could soon be in a posit
 ion to make definitive<br>
\nstatements regarding the mechanism of rar
 e-earth peak formation and thus<br>
\nthe astrophysical site of the r 
 process.
URL:https://www.physics.wisc.edu/events/?id=4692
END:VEVENT
END:VCALENDAR