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SUMMARY:Systematic studies of the continuum-coupling correlations in near-
 threshold states
DTSTART:20261112T130000Z
DTEND:20261112T140000Z
DTSTAMP:20261104T074800Z
UID:indico-event-14407@indico.ijclab.in2p3.fr
CONTACT:pierre.arthuis@ijclab.in2p3.fr
DESCRIPTION:Speakers: David Cardona (GANIL)\n\nNuclei are open quantum sys
 tems: their particle-emission thresholds lie low in their own excitation s
 pectra\, so most of their states are resonances\, and the continuum these 
 decay into belongs to the same Hamiltonian rather than to an external envi
 ronment. This work studies what the coupling to that continuum does to lig
 ht nuclei\, where the thresholds are densely interleaved with the levels a
 nd the systems are still small enough to be treated microscopically using 
 the Gamow Shell Model.\n \nIn this approach nuclear states are built from
  a mix of different configurations of the nucleons in their single-particl
 e orbits. Which configurations dominate depends on how close a state lies 
 to the decay channels available to it\, and on the other states around it.
  This work takes up both. First we take a doublet of equal angular momentu
 m and parity and drive their mixing through their shared continuum until t
 he two states become indistinguishable and coalesce into one\, a so-called
  exceptional point. In its proximity the individual states stop being mean
 ingful objects\, the reaction cross sections depart from the usual resonan
 ce shapes\, and the decay is no longer exponential. Then\, in ⁴He we fol
 low several states across the available thresholds\, each gaining binding 
 and shifting the weight of its configuration towards the channel that open
 s near it\, a direct microscopic demonstration of near-threshold clusterin
 g.\n\nhttps://indico.ijclab.in2p3.fr/event/14407/
LOCATION:100/2-A201 - Salle A201 (IJCLab)
URL:https://indico.ijclab.in2p3.fr/event/14407/
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