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SUMMARY:[RBRC seminar]  Statistical Properties of Actinides from Shell Mod
 el Monte-Carlo
DTSTART:20260129T173000Z
DTEND:20260129T193000Z
DTSTAMP:20260311T035300Z
UID:indico-event-31337@indico.bnl.gov
DESCRIPTION:Speakers: Dallas DeMartini (BNL)\n\nMicroscopic calculations o
 f nuclear properties in the presence of correlations pose a challenging ma
 ny-body problem. The configuration-interaction shell model provides a suit
 able framework for the inclusion of correlations\, but the large dimension
 ality of the many-particle model space has hindered its application in hea
 vy nuclei\, often necessitating the use of approximations such as mean-fie
 ld methods or density functional approaches. The shell-model Monte Carlo (
 SMMC) method\, which is based on the Hubbard-Stratonovich transformation\,
  enables calculations in model spaces that are many orders of magnitude la
 rger than can be treated by direct diagonalization methods.\nWe have recen
 tly extended the SMMC method to the actinides. The actinides present sever
 al technical challenges compared with the lanthanides: the required valenc
 e single-particle model space is larger\, and the lower first excitation e
 nergy requires larger values of the imaginary time (or inverse temperature
 ) to compute the ground-state properties of these nuclei. In order to stud
 y these nuclei\, we have developed phenomenological good-sign interactions
  for use in single-particle model spaces as large as 10^32\, which is 20 o
 rders of magnitude larger than the largest space used in conventional shel
 l-model calculations.\nIn this seminar\, I will first introduce the conven
 tional shell-model picture and discuss the differences of the SMMC method.
  I will discuss novel techniques used for calculations and present new res
 ults for key properties of actinides. I will show that our methods produce
  nuclear level densities that are in excellent agreement with recent Oslo 
 method experiments and have enabled the first theoretical predictions that
  the so-called 'low-energy enhancement' persists in the gamma-ray strength
  functions of actinides. I will also present ongoing investigations into t
 he quadrupole shape distributions of these actinides. These observables ha
 ve applications as inputs in calculations of astrophysical reaction rates\
 , nuclear fission\, and relativistic heavy-ion collisions.\n\nhttps://indi
 co.bnl.gov/event/31337/
LOCATION:2-160 (https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6J
 fFp6HAnpyLxex.1)
URL:https://indico.bnl.gov/event/31337/
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