Speaker
Badamsambuu Jigmeddorj
(University of Guelph)
Description
The Xe isotopes are centrally located in the $Z>50$, $N<82$ region that
displays an extraordinarily smooth evolution of simple collective signatures.
However, the collectivity of excited states in this region is very poorly
characterized because of a general lack of spectroscopic data for
low-spin states that provide measures of collective properties such as relative
and absolute $B(E2)$ decay strengths and the occurrence of $E0$ decays.
There are spectroscopic hints to unusual structures in this region.
The $0^+_3$ states in $^{124-132}$Xe are very strongly populated in
$(^3He,n)$ reactions, suggesting a pairing vibrational structure influenced by
proton subshell gaps, perhaps leading to shape-coexistence that could give rise
to strong $E0$ transitions. Recent work on $^{124}$Xe [1] has established nearly
identical quadrupole collectivity for the pairing vibrational $0^+_3$ band and
the ground state band. However, in $^{122}$Xe, the $0^+_3$ state has not been
firmly identified. A high-statistics $^{122}$Cs $\beta^+/EC$ decay experiment to
obtain detailed spectroscopic data for low-spin states was performed
at the TRIUMF-ISAC facility using the 8$\pi$ $\gamma$-ray spectrometer
and its auxiliary detectors including PACES, an array of five Si(Li) detectors,
for conversion electrons spectroscopy. The status of the data analysis and
preliminary results will be presented.
[1] A.J. Radich ${\it et\ al.}$, Phys. Rev. C ${\bf 91}$, 044320 (2015).
Author
Badamsambuu Jigmeddorj
(University of Guelph)
Co-authors
Adam Garnsworthy
(TRIUMF)
Allison Radich
(University of Guelph)
Baharak Hadinia
(University of Guelph)
Carl Svensson
(University of Guelph)
Corina Andreoiu
(Simon Fraser University)
David Cross
(Simon Fraser University)
Evan Rand
(University of Guelph)
Gordon Ball
(TRIUMF)
Greg Hackman
(TRIUMF)
Jason Park
(TRIUMF)
Jennifer Pore
(Simon Fraser University)
John Wood
(Georgia Institute of Technology)
Mohamad Moukaddam
(TRIUMF)
Mustafa Rajabali
(TRIUMF)
Paul Garrett
(University of Guelph)
Phil Voss
(Simon Fraser University)
Steven Yates
(University of Kentucky)
T Bruhn
(Simon Fraser University)
Usman Rizman
(Simon Fraser University)
Zhimin Wang
(TRIUMF)
