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SUMMARY:Probing the Shell Effects on Fission: The New Superheavy Nucleus 2
 57Sg
DTSTART:20251114T133000Z
DTEND:20251114T160000Z
DTSTAMP:20260315T045300Z
UID:indico-event-36753@indico.in2p3.fr
DESCRIPTION:Speakers: Pavol Mošať (GSI)\n\nThe fission of heavy atomic n
 uclei is the main constraint on the existence of chemical elements with la
 rge atomic numbers. Nuclei with Z > 103 are stabilized against fission d
 ue to effects resulting from the nuclear shell structure and can thus exis
 t for a time longer than 10−14 s. This is the time needed for an atomic
  shell to be established [1]. The so-called isotopic borders for particul
 ar superheavy elements can be studied in the neutron-deficient nuclei [2\
 ,3]. However\, the present experimental technique (i.e.\, in-flight separa
 tion) is limited to study nuclei with half-lives of about 10−6 s.\nAnot
 her approach suitable for studying sub-µs nuclei is via long-lived K-isom
 eric states [4\,5]. Recently\, at TASCA\, the 60-ns isotope 252Rf was dis
 covered via its K-isomeric state\, which has a half-life long enough to su
 rvive the flight through the separator [3]. This result shows that the is
 otopic border of Rf isotopes is yet to be reached.\nThe next step is to ex
 plore the isotopic border of Sg isotopes. Recently\, at TASCA\, we studied
  the neutron-deficient isotopes 257-259Sg\, aiming to investigate their fi
 ssion properties and to probe the location of the isotopic border.\nIn the
  talk\, results from the experiment will be discused in detail.\nReference
 s\n\n\n\n\n[1]\n\n\nA. Wapstra\, Pure Appl. Chem. 63\, 879 (1991).\n\n\n\n
 \n[2]\n\n\nJ. Khuyagbaatar\, et al.\,  Phys. Rev. C 104\, L031303 (2021).
 \n\n\n\n\n[3]\n\n\nJ. Khuyagbaatar\, P. Mosat\, et al.\, Phys. Rev. Let. 1
 34\, 022501 (2025).\n\n\n\n\n[4]\n\n\nD. Ackermann\, S. Antalic and F. P. 
 Heßberger\, Eur. Phys. J. Spec. Top. 233\, 1017 (2024).\n\n\n\n\n[5]\n\n\
 nJ. Khuyagbaatar\, Eur. J. Phys. A 58\, 243 (2022).\n\n\n\n\n \n\nhttps:/
 /indico.in2p3.fr/event/36753/
URL:https://indico.in2p3.fr/event/36753/
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