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SUMMARY:New isomers in 213Tl and 215Tl revealing shell evolution beyond N 
 = 126 shell closure
DTSTART;VALUE=DATE-TIME:20240530T141000Z
DTEND;VALUE=DATE-TIME:20240530T143000Z
DTSTAMP;VALUE=DATE-TIME:20261012T132025Z
UID:indico-contribution-23080@indico.ific.uv.es
DESCRIPTION:Speakers: Tik Tsun Yeung (The University of Tokyo)\nExperiment
 al data of isomerism in the neutron-rich N ≥ 126 region are important to
  test the predictability of shell evolution beyond the N = 126 shell closu
 re by shell-model calculations. Moreover\, the predicted properties of mor
 e exotic isotopes could affect the abundance of actinides in r-process cal
 culations [1]. However\, these information are scarcely available as it is
  challenging to access this region by current facilities. \n\nWe will pres
 ent new isomeric transitions in the BRIKEN experiment [2] at RIBF\, RIKEN 
 Nishina Center. Particle identification of isotopes with mass ranging 200 
 ≲ A ≲ 220 was confirmed by the BigRIPS separator and the novel silicon
  dE telescope. For the first time at RIBF\, decays of nuclei southeast of 
 208Pb were measured by the BRIKEN array [3]. New isomers in 213Tl and 215T
 l [4] were observed by correlation among implantation\, Meitner-Ellis elec
 tron [5] and γ events using WAS3ABi active stopper [6] and high-purity ge
 rmanium (HPGe) clover detector. Our proposed isomeric level schemes [4] ar
 e compared to the shell-model calculations [7] to explain shell evolution.
  Plans to further investigate isomeric transitions and β decays in the sa
 me region will be introduced. \n\nReferences \n[1] E. Holmbeck et al.\, As
 trophys. J. 870(1)\, 23 (2019).\n[2] J. Wu et al.\, RIBF NP-PAC Proposal N
 P1712-RIBF158 (2017).\n[3] A. Tolosa-Delgado et al.\, Nucl. Instrum. Metho
 ds. Phys. Res. A 925-133 (2019).\n[4] T. T. Yeung\, A. I. Morales\, J. Wu\
 , M. Liu\, C. Yuan et al.\, First Exploration of Monopole-Driven Shell Evo
 lution above the N = 126 shell closure: new Millisecond Isomers in 213Tl a
 nd 215Tl\, arXiv:2401.06428 (2024). https://arxiv.org/abs/2401.06428 \n[5]
  H. E. Mahnke\, Notes Rec. 76(1)\, 107-116 (2022).\n[6] S. Nishimura\, Pro
 g. Theor. Exp. Phys. 2012(1)\, 03C006 (2012).\n[7] C. Yuan et al.\, Phys. 
 Rev. C 106(4)\, 044314 (2022).\n\nhttps://indico.ific.uv.es/event/7332/con
 tributions/23080/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23080/
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