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SUMMARY:Hard proton knockout from 12C in inverse kinematics: quasi-elastic
  scattering and short-range correlations
DTSTART;VALUE=DATE-TIME:20261029T132000Z
DTEND;VALUE=DATE-TIME:20261029T133500Z
DTSTAMP;VALUE=DATE-TIME:20261021T051825Z
UID:indico-contribution-6325@cern.ch
DESCRIPTION:Speakers: Stepan Cherepanov ()\nThe second Short-Range Correla
 tions (SRC) experiment at JINR\, performed in 2022\, used   a 44.8 GeV/c $
 ^{12}C$ beam incident on a liquid-hydrogen target to study hard proton kno
 ckout from $^{12}C$ in inverse kinematics. The reaction products were dete
 cted with a modified BM@N spectrometer. The experimental setup was optimiz
 ed for proton–proton scattering near $90^{\\circ}$ in the center-of-mass
  frame\, corresponding to a squared four-momentum transfer of approximatel
 y 2.5 $GeV/c^2$.\n\n\nUnder these kinematic conditions\, the cross section
  for the $^{12}C(p\,2p)^{11}B$ reaction was measured for the first time. T
 he result was compared with single-particle distorted-wave impulse-approxi
 mation calculations incorporating well-constrained initial- and final-stat
 e interactions within the Glauber framework. The extracted spectroscopic r
 eduction factor\, R_s=0.96±0.01(stat.) ±0.05(syst.)\, is consistent with
  results from high- $Q^2$  A(e\,e'p) measurements. It is\, however\, signi
 ficantly larger than the reduced single-particle strengths\, R_s=0.6\, typ
 ically obtained from low-energy quasi-elastic electron- and hadron-induced
  reactions. This comparison supports a scale-dependent picture of the obse
 rved single-particle strength in nuclei.\n\n\nThe ongoing analysis of even
 ts with an identified $^{10}B$ residual nucleus searches for exclusive sig
 natures of scattering from short-range-correlated nucleon pairs in $^{12}C
 $. The event selection is guided by detailed simulations of the SRC signal
  and relevant background processes. The talk will present the measured qua
 si-elastic cross section and spectroscopic strength\, discuss the observed
  exclusive event topologies\, and report the current status of the SRC-pai
 r knockout analysis.\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6325/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6325/
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