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SUMMARY:Study of the excited 8.1 MeV state of $^{11}$C
DTSTART;VALUE=DATE-TIME:20261030T152500Z
DTEND;VALUE=DATE-TIME:20261030T154000Z
DTSTAMP;VALUE=DATE-TIME:20261104T013911Z
UID:indico-contribution-6359@cern.ch
DESCRIPTION:Speakers: Andrey Danilov (NRC Kurchatov Institute)\nThe $^{11}
 $C nucleus is a proton-rich nucleus with intriguing exotic features. Unlik
 e the neutron-rich $^{11}$Be nucleus\, isobar analog with a confirmed neut
 ron halo\, $^{11}$C does not form a pronounced proton halo due to the Coul
 omb barrier. \n\nThe results of an experimental study of the structure of 
 $^{11}$C using the transfer reaction $^{10}$B($^{7}$Li\,$^6$He)$^{11}$C at
  a beam energy of 58 MeV\, carried out at the U400 cyclotron at JINR\, are
  presented. The main focus is on a detailed analysis of the excited state 
 with an energy of 8.1 MeV. Using a multi-stage identification procedure an
 d kinematic calculations\, it was possible to reliably separate the peak u
 nder study from the contributions of parasitic impurities $^{12}$C and $^{
 16}$O in the operating angle range\, ensuring high purity of experimental 
 data. \n\nThe distorted waves method was used to interpret the obtained an
 gular distributions of differential cross sections. The analysis showed th
 at the radial dependence of the form factor for the 8.1 MeV state decrease
 s significantly more slowly (has a longer "tail") compared to the ground s
 tate. This directly indicates an abnormally large root mean square radius 
 of this level. The obtained results became the first experimental evidence
  of the increased size of the 8.1 MeV state in the $^{11}$C nucleus. Its s
 patial dimensions turned out to be comparable to the radius of the Hoyle s
 tate in $^{12}$C and the mirror level in $^{11}$B. This is consistent with
  the theoretical predictions of the antisymmetrized molecular dynamics (AM
 D) model and confirms the presence of an exotic three center cluster struc
 ture 2α + $^3$He\, which allows us to confidently assign this level to th
 e class of “size isomers”.\n\nhttps://indico.particle.mephi.ru/event/6
 26/contributions/6359/
LOCATION: Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6359/
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