The evolution of the simple collective signature, the excited first state energy,
is extraordinarily smooth for the nuclei in the Z50, N82 region, which is expected
to be an ideal region to test collectivity. The study of Xe is a part of a systematic
examination of the development of collectivity in the Xe isotopes which are located in the region.
Detailed investigations of nuclear structure in the Xe isotopes reveal
a pairing vibrational structure influenced by proton subshell gaps.
In particular, the states in Xe are very strongly populated in
(He,n) reactions [1], suggesting a pairing vibrational structure.
Recent work on Xe [2] has established nearly identical quadrupole collectivity
for the pairing vibrational band and the ground state band.
The collectivity of excited states in Xe is not well
characterized because of a general lack of spectroscopic data for
low- and high-spin states, which provide measures of collective properties.
The experiment to study Xe with the /EC decay of Cs
was performed at the TRIUMF-ISAC facility located in Vancouver, B.C., Canada.
The data collected have enabled
the observation of about 505 new transitions and about 250 new levels, including
around 145 new high-spin states. The results on the establishment of the band members of
the and bands, observation of important, but
previously unobserved, and transitions [3],
and the confirmation of the spin of the state [4] are reported.
In addition, the present work is focused on newly observed high-spin states of Xe.
[1] W.P. Alford, , Nucl. Phys. A, 339 (1979).
[2] A.J. Radich , Phys. Rev. C, 044320 (2015).
[3] B. Jigmeddorj , Web of Conf. 107, 03014 (2016)
[4] B. Jigmeddorj , Physics Procedia 90 ( 2017 )