Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session KE: Award Session |
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Chair: David Dean, Oak Ridge National Laboratory Room: Salon 5 |
Friday, October 27, 2017 2:00PM - 2:36PM |
KE.00001: Final Results from the Jefferson Lab Q$_{\rm weak}$ Experiment Invited Speaker: Gregory Smith The Q$_{\rm weak}$ collaboration has unblinded our final result. We briefly describe the $\vec{\rm{e}}$p elastic scattering experiment used to extract the asymmetries measured in the two distinct running periods which constituted the experiment. The precision obtained on the final combined asymmetry is $\pm$ 9.3 ppb. Some of the backgrounds and corrections applied in the experiment will be explained and quantified. We then provide the results of several methods we have used to extract consistent values of the proton's weak charge $Q^{p}_W$ from our asymmetry measurements. We also present results for the strange and axial form factors obtained from a fit to existing parity-violating electron scattering data. In conjunction with existing atomic parity violation results on $^{133}$Cs we extract the vector weak quark couplings C$_{1u}$ and C$_{1d}$. The latter are combined to obtain the neutron's weak charge. From the proton's weak charge we obtain a result for $\sin^2 \theta_W$ at the energy scale of our experiment, a sensitive SM test of the running of $\sin^2 \theta_W$. We also show the mass reach for new beyond-the-Standard-Model physics obtained from our determination of the proton's weak charge and its uncertainty, and discuss sensitivity to specific models. [Preview Abstract] |
Friday, October 27, 2017 2:36PM - 3:12PM |
KE.00002: Dissertation Award in Nuclear Physics Recipient: Nuclear structure at the Edge: Proton decay and the invariant-mass Method Invited Speaker: Kyle W. Brown Two-nucleon decay is the most recently discovered nuclear-decay mode. For proton-rich nuclei, most multi-proton decays occur via sequential steps of one-proton emission. Direct two-proton (2p) decay was believed to occur only in even-Z nuclei beyond the proton-drip line where one-proton decay is energy forbidden. This has been observed for the ground states of around a dozen nuclei including 6Be, the lightest case, and $^5^4$Zn, the heaviest case. Direct 2p decay has also recently been observed for isobaric-analog states where all possible 1p intermediates are either isospin allowed and energy forbidden, or energy allowed and isospin forbidden. For light proton emitters $(A < 12)$, the lifetimes are short enough that the invariant-mass technique is ideal for measuring the decay energy, intrinsic width, and, for multi-proton decays, the momentum correlations between the fragments. I will describe recent measurements of proton emitters using the invariant-mass technique with the High-Resolution Array (HiRA). I will present a new, high-statistics measurement on the decay of the ground and excited states in $^1^2$O. By measuring the momentum correlations between the decay fragments, one can observe how the decay transitions from direct to sequential as the decay energy increases. I will present data on the isobaric-analog pair $^8$C and 8BIAS, which highlight the two known types of direct 2p decay. I will also present the first observation of $^1^1$O, the mirror of the well-known halo nucleus $^1^1$Li. [Preview Abstract] |
Friday, October 27, 2017 3:12PM - 3:48PM |
KE.00003: Dissertation Award in Nuclear Physics Recipient: Astromaterials in Neutron Stars Invited Speaker: Matthew E. Caplan Stars freeze. As they age and cool white dwarfs and neutron stars crystallize, with remarkable materials forming in their interiors. These `astromaterials' have structures similar to terrestrial crystalline solids and liquid crystals, though they are over a trillion times denser. Notably, because their material properties affect the observable properties of the star, astromaterials must be understood to interpret observations of neutron stars. Thus, astromaterial science can be thought of as an interdisciplinary field, using techniques from material science to study nuclear physics systems with astrophysical relevance. In this talk, I will discuss recent results from simulations of astromaterials and how we use these results to interpret observations of neutron stars in X-ray binaries. In addition, I will discuss how nuclear pasta, in neutron stars, forms structures remarkably similar to biophysical membranes seen in living organisms. [Preview Abstract] |
Friday, October 27, 2017 3:48PM - 4:24PM |
KE.00004: Imagine a universe with 85\% down quarks: Mentoring for inclusive excellence in nuclear science. Invited Speaker: Sherry J. Yennello If nature created six down quarks for every up quark the world might be a bit more strange. The US population is made up of over 50\% women. Hispanic Americans and African Americans make up over 30\% of the US population. The processes by which we foster curiosity, educate our youth, encourage people into science, recruit and retain people into physics and welcome them as members of our nuclear physics community results in a much different demographic in the membership of the DNP. Enabling the development of an identity as a scientist or nuclear scientist is a crucial part of mentoring young people to successful careers in nuclear science. Research experiences for students can play a critical role in that identity development. Since 2004, over 170 students have explored nuclear science through the Research Experiences for Undergraduates program Texas A\&M University Cyclotron Institute. [Preview Abstract] |
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