37 research outputs found
Comparative studies of dipole polarizabilities in Sr, Ba and Ra and their applications to optical clocks
Static dipole polarizabilities are calculated in the ground and metastable
states of Sr, Ba and Ra using the relativistic coupled-cluster
method. Trends of the electron correlation effects are investigated in these
atomic ions. We also estimate the Stark and black-body radiation shifts from
these results for these systems for the transitions proposed for the optical
frequency standards and compare them with available experimental data.Comment: 10 pages, 1 figur
Expanding RIB Capabilities at the Cyclotron Institute: \textsuperscript{3}He-LIG production with an Isobar Separator LSTAR
A new \textsuperscript{3}He-driven IGISOL production station and mass
separator have been designed to produce neutron-deficient low-mass isotopes at
the Cyclotron Institute for the TAMUTRAP facility. The LSTAR design has a mass
resolution to reject contaminants with
efficiency.Comment: Proceeding for EMIS 202
On-line Excited-State Laser Spectroscopy of Trapped Short-Lived Ra Ions
As an important step towards an atomic parity violation experiment in one
single trapped Ra ion, laser spectroscopy experiments were performed with
on-line produced short-lived Ra ions. The isotope shift of
the 6\,^2D\,-\,7\,^2P and
6\,^2D\,-\,7\,^2P transitions and the hyperfine structure
constant of the 7\,^2S and 6\,^2D states in Ra
were measured. These values provide a benchmark for the required atomic theory.
A lower limit of ms for the lifetime of the metastable
6\,^2D state was measured by optical shelving.Comment: 4.2 pages, 6 figures, 2 tables
Measurement of the half-life of the T= mirror decay of Ne and its implication on physics beyond the standard model
The superallowed mixed mirror decay
of Ne to F is excellently suited for high precision studies of
the weak interaction. However, there is some disagreement on the value of the
half-life. In a new measurement we have determined this quantity to be
= s, which differs
from the previous world average by 3 standard deviations. The impact of this
measurement on limits for physics beyond the standard model such as the
presence of tensor currents is discussed.Comment: 5 pages, 3 figures, 1 tabl
Radium ion: A possible candidate for measuring atomic parity violation
Single trapped and laser cooled Radium ion as a possible candidate for
measuring the parity violation induced frequency shift has been discussed here.
Even though the technique to be used is similar to that proposed by Fortson
[1], Radium has its own advantages and disadvantages. The most attractive part
of Radium ion as compared to that of Barium ion is its mass which comes along
with added complexity of instability as well as other issues which are
discussed hereComment: Conference proceedin
Production of short lived radioactive beams of radium
Short lived Ra isotopes have been produced at the TRIP
facility in inverse kinematics via the fusion-evaporation reaction
Pb+C at 8 MeV/u. Isotopes are separated from other reaction
products online using the TRIP magnetic separator. The energetic radium
(Ra) isotopes at the exit of the separator were converted into low energy ions
with a thermal ionizer. Ra isotopes have been identified by observing their
decay and life times.Comment: 9 pages including 4 figures and 1 tabl