83 research outputs found
Novel technique for constraining r-process (n,) reaction rates
A novel technique has been developed, which will open exciting new
opportunities for studying the very neutron-rich nuclei involved in the
r-process. As a proof-of-principle, the -spectra from the -decay
of Ga have been measured with the SuN detector at the National
Superconducting Cyclotron Laboratory. The nuclear level density and
-ray strength function are extracted and used as input to
Hauser-Feshbach calculations. The present technique is shown to strongly
constrain the Ge()Ge cross section and reaction rate.Comment: 5 pages, 3 figure
High-Precision Measurement of the 19Ne Half-Life and Implications for Right-Handed Weak Currents
We report a precise determination of the 19Ne half-life to be s. This result disagrees with the most recent precision
measurements and is important for placing bounds on predicted right-handed
interactions that are absent in the current Standard Model. We are able to
identify and disentangle two competing systematic effects that influence the
accuracy of such measurements. Our findings prompt a reassessment of results
from previous high-precision lifetime measurements that used similar equipment
and methods.Comment: 5 pages and 5 figures. Paper accepted for publication in Phys. Rev.
Let
Production cross sections of neutron rich isotopes from a 82Se beam
Production cross sections for neutron-rich nuclei from the fragmentation of a
82Se beam at 139 MeV/u were measured. The longitudinal momentum distributions
of 122 neutron-rich isotopes of elements were determined by
varying the target thickness. Production cross sections with beryllium and
tungsten targets were determined for a large number of nuclei including several
isotopes first observed in this work. These are the most neutron-rich nuclides
of the elements (64Ti, 67V, 69Cr, 72Mn). One event was
registered consistent with 70Cr, and another one with 75Fe. A one-body Qg
systematics is used to describe the production cross sections based on thermal
evaporation from excited prefragments. The current results confirm those of our
previous experiment with a 76Ge beam: enhanced production cross sections for
neutron-rich fragments near Z=20.Comment: Talk given at the 11th International Conference on Nucleus-Nucleus
Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear
in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS
Ground State Electromagnetic Moments of <sup>37</sup>Ca
The hyperfine coupling constants of neutron deficient Ca were deduced from the atomic hyperfine spectrum of the transition in Ca II, measured using the collinear laser spectroscopy technique. The ground-state magnetic-dipole and spectroscopic electric-quadrupole moments were determined for the first time as and fm, respectively. The experimental values agree well with nuclear shell model calculations using the universal sd model-space Hamiltonians versions A and B (USDA/B) in the -model space with a 95\% probability of the canonical nucleon configuration. It is shown that the magnetic moment of Ca requires a larger non--shell component than that of Ca for good agreement with the shell-model calculation, indicating a more robust closed sub-shell structure of Ca at the neutron number = 16 than Ca. The results are also compared to valence-space in-medium similarity renormalization group calculations based on chiral two- and three-nucleon interactions
Mass Measurement of P for Improved Type-I X-ray Burst Modeling
Light curves are the primary observable of type-I x-ray bursts. Computational
x-ray burst models must match simulations to observed light curves. Most of the
error in simulated curves comes from uncertainties in process reaction
rates, which can be reduced via precision mass measurements of
neutron-deficient isotopes in the process path. We perform a precise
atomic mass measurement of P and use this new measurement to update
existing type-I x-ray burst models to produce an improved light curve.
High-precision Penning trap mass spectrometry was used to determine the
atomic mass of P. Modules for Experiments in Stellar Astrophysics (MESA)
was then used to simulate x-ray bursts using a 1D multi-zone model to produce
updated light curves. The mass excess of P was measured to be
-670.7 0.6 keV, a fourteen-fold precision increase over the mass reported
in AME2020. The Si()P and reverse photodisintegration
reaction rates have been determined to a higher precision based on the new,
high precision mass measurement of P, and MESA light curves generated
using these rates. Changes in the mass of P seem to have minimal effect
on XRB light curves, even in burster systems tailored to maximize impact.
The mass of P does not play a significant role in x-ray burst light
curves. It is important to understand that more advanced models don't just
provide more precise results, but often qualitatively different ones. This
result brings us a step closer to being able to extract stellar parameters from
individual x-ray burst observations. In addition, the Isobaric Multiplet Mass
Equation (IMME) has been validated for the quartet, but only
after including a small, theoretically predicted cubic term and utilizing an
updated excitation energy for the isobaric analogue state of Si.Comment: 8 pages, 7 figure
β-decay Half-lives of Neutron-rich Nuclides in the A = 100 – 110 Mass Region
β-decay half-lives of neutron-rich nuclides in the A = 100–110 mass region have been measured using an implantation station installed inside of the Summing NaI(Tl) (SuN) detector at the National Superconducting Cyclotron Laboratory. Accurate half-lives for these nuclides are important for nuclear astrophysics, nuclear structure, and nuclear technology. The half-lives from the present work are compared with previous measurements, showing overall good agreement
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