Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session KM: Undergraduate Research I
10:30 AM–12:06 PM,
Saturday, October 29, 2022
Hyatt Regency Hotel
Room: Imperial 9
Chair: Mike Youngs, Texas A&M
Abstract: KM.00003 : Studying the Nuclear Isomers of Thallium at the ISOLDE Decay Station*
10:54 AM–11:06 AM
Presenter:
Jordan R Cory
(Stevens Institute of Technology)
Author:
Jordan R Cory
(Stevens Institute of Technology)
Collaboration:
ISOLDE Decay Station
induce fission in an Uranium target. These fission fragments are then extracted,
mass separated and sent to the ISOLDE Decay Station to study their decay. One
such decay is that of nuclear isomers, excited states with a relatively long life-
time. All odd neutron-deficient thallium isotopes are known to have such states
that de-excite by internal decay. These high-spin isomers decay to the ground
state via an intermediate state that is populated by a high-multipole gamma
transition. These gammas could also go undetected if they are absorbed by an
electron in the inner atom in a process called electron conversion. The nuclear
isomer of Thallium has a different shape than the ground state, a fascinating
phenomenon only known to the atomic nucleus called shape coexistence. This
project intends to measure the lifetime of the non-isomeric intermediate state of
Thallium, the electron conversion coefficient, and the mixing ratio of the mul-
tipole gamma transitions to extract transition strength. These measurements will
allow us to make inferences about the shape of Thallium in the ground state
and the isomeric state.
*NSF Award #PHY-1949923
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