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SUMMARY:Prompt and delayed gamma-ray spectroscopy of neutron-rich Au isoto
 pes populated from multi-nucleon transfer reaction
DTSTART;VALUE=DATE-TIME:20240531T080000Z
DTEND;VALUE=DATE-TIME:20240531T083000Z
DTSTAMP;VALUE=DATE-TIME:20260418T225603Z
UID:indico-contribution-23765@indico.ific.uv.es
DESCRIPTION:Speakers: Yung Hee KIM (Institute for Basic Science (IBS)\, Da
 ejeon\, Korea)\nThe investigation of neutron-rich nuclei situated below $^
 {208}$Pb is anticipated to unveil a spectrum of phenomena\, from shape evo
 lution to the existence of exotic shapes and co-existence\, which manifest
  from nuclear interaction. Additionally\, nuclides' vicinity to the N=126 
 shell closure is linked to understanding the r-process path towards actini
 des. Although its importance is well recognized\, only limited knowledge o
 f the excited states is available\, restricting comprehensive understandin
 g. Despite the acknowledged importance of this realm\, our understanding r
 emains restricted primarily due to challenges in the production of such is
 otopes. Furthermore\, the available excited states of known isotopes are l
 imited to decay spectroscopy.\n\nTo address these limitations\, a novel ex
 periment was performed at GANIL aimed at exploring isotopes of interest vi
 a multi-nucleon transfer reactions between a 7 MeV/u $^{136}$Xe beam and a
  $^{198}$Pt target. The large acceptance VAMOS++ magnetic spectrometer and
  AGATA Ge tracking array were used to measure excited states of nuclides o
 f interest. Several new experimental techniques were implemented. First\, 
 a new second arm ToF spectrometer was installed\, which is composed of a 1
 .2 m long vacuum chamber and large area multi-wire proportional counter to
  measure the velocity vector of the target-like fragments. Second\, a four
  EXOGAM clover HPGe array was installed at the end of the second arm to me
 asure the delayed gamma rays from the excited states. Finally\, a new meth
 od to determine particle identification was developed using a machine lear
 ning algorithm\, where energy and charge states are determined using super
 vised machine learning\, and atomic numbers are determined by the unsuperv
 ised learning method.\n\nAmong the plethora of populated isotopes\, partic
 ular attention was devoted to the nuclear structure of odd-mass Au isotope
 s. The structure of Au isotopes has the longest chain of odd-mass isotopes
  with excited state information\; showcasing proton-hole states with nearl
 y constant energies across varying neutron numbers\, but the neutron-rich 
 part of information is limited near the stable isotope $^{197}$Au. The pre
 liminary results of several neutron-rich Au isotopes\, such as their level
  structure\, will be presented.\n\nhttps://indico.ific.uv.es/event/7332/co
 ntributions/23765/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23765/
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