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SUMMARY:Understanding the structure of 16C and the B(E2) problem through L
 arge-Scale Shell-Model (LSSM) calculations
DTSTART:20250401T140000Z
DTEND:20250401T150000Z
DTSTAMP:20260613T162100Z
UID:indico-event-1516064@indico.cern.ch
DESCRIPTION:Speakers: Khuliso Murulane (University of Johannesburg)\n\nThe
  structure of neutron-rich carbon isotopes continues to be a subject of in
 terest in nuclear physics\, particularly the nucleus 16C. One of the key u
 nresolved issues is the variation in measured B(E2) values for the transit
 ion from the first-excited 2+1 state to the ground state\, with reported v
 alues spanning nearly an order of magnitude. Traditional interpretations a
 ssume asimple model in which two valence neutrons couple to a 14C core\, r
 equiring the introduction of a large effective charge to match experimenta
 l data. However\, this approach does not fully capture the complexity of 
 16C’s nuclear structure.\nThis talk presents results from a large-scale
   (2 + 4)ℏω no-core shell-model calculation of 16C\, incorporating si
 x major shells and employing the Zheng et al [1] interaction within the OX
 BASH [2] framework. The analysis of the wave functions indicates significa
 nt mixing of higher-order configurations\, challenging the validity of the
  simple two-neutron model. The theoretical predictions are further validat
 ed by comparing the computed excitation spectrum and intermediate-energy e
 lastic proton scattering cross-sections with experimental data. Notably\, 
 the results demonstrate that a smaller\, or even negligible\, effective ch
 arge is sufficient to reproduce the accepted B(E2) value\, resolving discr
 epancies observed in previous studies.\nReferences[1] D. C. Zheng\, B. R. 
 Barrett\, J. P. Vary\, W. C. Haxton\, and C.-L.Song\, Phys. Rev. C 52\, 24
 88 (1995).[2] OXBASH-MSU (the Oxford-Buenos-Aries-Michigan State Universit
 y shell model code). A.Etchegoyen\, W. D. M. Rae\, and N. S. Godwin (MSU v
 ersion by B. A. Brown\, 1986)\; B.A.Brown\, A. Etchegoyen\, and W. D. M. R
 ae\, MSUCL Report Number 524 (1986).\n\nhttps://indico.cern.ch/event/15160
 64/
LOCATION:508/1-001 (CERN)
URL:https://indico.cern.ch/event/1516064/
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