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SUMMARY:Study of the $^8$Li low-lying excited states
DTSTART;VALUE=DATE-TIME:20241023T081500Z
DTEND;VALUE=DATE-TIME:20241023T083000Z
DTSTAMP;VALUE=DATE-TIME:20260811T210812Z
UID:indico-contribution-4170@cern.ch
DESCRIPTION:Speakers: Andrey Danilov (NRC Kurchatov Institute)\nIn the A=8
  multiplet\, a halo was first discovered in $^8$B in [1] based on the incr
 eased quadrupole moment. It was shown that the halo structure is core $^7$
 Be and has a valence proton. It should be noted that the halo was discover
 ed despite the presence of both the Coulomb and centrifugal barriers. In [
 2]\, using total cross sections\, the presence of a proton halo in $^8$B w
 as confirmed\, and the root-mean-square radius R$_{rms}$ = 2.58 fm and the
  halo radius R$_h$ = 4.24 fm were determined. However\, the latest researc
 h indicates that $^8$B looks like a normal heavy ion [3]. All experiments 
 confirm a narrow width of the longitudinal momentum distribution of the co
 re\, and an obvious tail structure in the density distribution.\n\nThis im
 plies that mirror nuclei $^8$Li will be an interesting candidate for explo
 ring the formation of the halo structure. Many calculations have been made
  to investigate its structure\, such as ab initio calculations\, the clust
 er model\, the shell model\, the Hartree-Fock method\, and the relativisti
 c mean field. In fact\, there is still a large ambiguity to explain the st
 ructure of $^8$Li theoretically due to the lack of experimental constraint
 s. Although some of these methods could reproduce the radius or the quadru
 pole moment for $^8$Li well\, none of them could well describe both 8Li an
 d 8B simultaneously. \n\nMeanwhile\, several groups have tried to determin
 e its structure directly by deducing its matter radius or density distribu
 tion through the measurement of cross sections. In [4] using total cross s
 ections\, it is stated that there is no halo in $^8$Li. In [5] $^8$Li was 
 found to have a skin-like structure by comparing with the Li isotope and i
 ts mirror $^8$B. However\, the structure of the $^8$Li nucleus still canno
 t be clearly concluded\, especially for excited states.\n\nWe applied Modi
 fied diffraction model (MDM) to existing literature data on d+$^8$Li and $
 ^8$Li+$^{12}$C scattering and obtained radii of low-lying excited states o
 f $^8$Li\, practically similar as for g.s.\n\nhttps://indico.particle.meph
 i.ru/event/436/contributions/4170/
LOCATION: Moskvorechye 2
URL:https://indico.particle.mephi.ru/event/436/contributions/4170/
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