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SUMMARY:Quantum Correlations Between Two Giant Dipole Resonances in Ultra-
 Peripheral Collisions
DTSTART:20261127T090000Z
DTEND:20261127T100000Z
DTSTAMP:20261105T084600Z
UID:indico-event-1844@indico.wigner.hu
DESCRIPTION:Speakers: Ashik Ikbal (Hiroshima University)\n\nGiant dipole r
 esonances (GDRs) are among the most prominent collective excitations of a
 tomic nuclei\, yet angular correlations between neutrons emitted from GDR
 -excited nuclei have not been experimentally explored. In ultra-periphera
 l Au+Au collisions (UPCs)\, both nuclei can undergo GDR excitation and su
 bsequently separate before decaying into forward neutrons\, forming a nat
 ural system of two spatially separated nuclear dipole oscillations. This 
 provides a unique opportunity to investigate whether the two GDR excitati
 ons evolve independently or exhibit coherent correlations.\nWe report the
  first measurement of the angular correlation between GDR neutron emission
  from the two nuclei in Au+Au UPCs at $\\sqrt{s_{NN}} =$ $200$ GeV with ST
 AR. The position-sensitive ZDC-SMD detectors measure the transverse distri
 bution of forward neutrons independently on the East and West sides\, from
  which we reconstruct the first-order neutron-emission directions\, $\\Psi
 _1^E$ and $\\Psi_1^W$. In mutual electromagnetic dissociation XnXn events\
 , we observe a highly significant nonzero angular correlation\, $\\langle\
 \cos(\\Psi_1^E\\Psi_1^W)\\rangle$\, between the two GDR neutron-emission d
 irections.\nTo investigate the origin of the observed neutron angular corr
 elation\, we compare it with expectations from independent GDR decay\, el
 ectromagnetic recoil\, and a phase-locking scenario connecting the measur
 ed neutron directions to the two spatially separated GDR oscillations. Th
 is measurement introduces a new experimental approach to studying quantum
  correlations between collective nuclear excitations and provides a testb
 ed for probing possible entanglement between spatially separated nuclear 
 systems.\nZoom:\n\nhttps://indico.wigner.hu/event/1844/
LOCATION:Médiaterem (2. épület)
URL:https://indico.wigner.hu/event/1844/
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