Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session X3: Progess in Nuclear Physics |
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Sponsoring Units: DNP Chair: Craig Roberts, Argonne National Laboratory Room: Garden 3 |
Tuesday, May 3, 2011 10:45AM - 11:21AM |
X3.00001: Meson-Meson Interactions from Lattice QCD Invited Speaker: Chiral symmetry strongly constrains the interactions of pions at low energies, dictating the scattering of pions off other hadrons vanish at threshold in the chiral limit. These properties make pion interactions ideal quantities to study with lattice QCD, in particular, pion self-interactions. I will describe recent lattice computations of $\pi\pi$ scattering, and demonstrate that with the aid of chiral perturbation theory, we can now predict the $I=2$ scattering length with 1\% precision. We can extend this analysis to $SU(3)$ and include $K^+K^+$ and $K^+\pi^+$ interactions, as well as the quantity $f_K / f_\pi$. It has been shown that these four physical processes, share only two linear combinations of counterterms. This fact, combined with the numerical and theoretical cleanliness of these quantities, make them an ideal laboratory to explore the predictions of $SU(3)$ symmetry, including explicit $SU(3)$ symmetry breaking. I will describe local and global chiral $SU(2)$ and $SU(3)$ analyses of the NPLQCD computations of these systems and the resulting physical predictions. Time permitting, I will also briefly review lattice computations of other related quantities, namely multi-meson systems and the determination of the three-pion interaction, meson-baryon scattering, and the scattering of mesons off charmed hadrons. [Preview Abstract] |
Tuesday, May 3, 2011 11:21AM - 11:57AM |
X3.00002: Production of the $\gamma$-ray emitters $^{22}$Na and $^{26}$Al in classical novae Invited Speaker: A classical nova is a thermonuclear explosion occurring on the surface of a white dwarf star that is accreting hydrogen-rich material from a companion star in a binary system. Novae are expected to eject the $\gamma$-ray astronomy targets $^{22}$Na and $^{26}$Al in observable quantities. If $^{22}$Na were observed it could provide an unprecedented isotopic constraint for nova models. The observed Galactic $^{26}$Al/$^{60}$Fe ratio is already used as a benchmark for models of nucleosyntheis in massive stars and their supernovae, but a substantial contribution of $^{26}$Al from novae could skew such comparisons. The expected production of $^{22}$Na and $^{26}$Al in novae is sensitive to modeling details and uncertainties in the thermonuclear rates of the $^{22}$Na($p,\gamma$)$^{23}$Mg and $^{25}$Al($p,\gamma$)$^{26}$Si reactions, respectively. We recently measured the strengths of the relevant $^{22}$Na($p,\gamma$)$^{23}$Mg resonances to be higher than previous measurements by factors of two or more using the tandem Van de Graaff accelerator at the Center for Experimental Nuclear Physics and Astrophysics (CENPA) and $^{22}$Na targets prepared at TRIUMF-ISAC. We also evaluated the $^{25}$Al($p,\gamma$)$^{26}$Si rate at CENPA based on available experimental data, reducing the uncertainty by large factors. An imminent CENPA-led experiment is expected to further solidify the $^{25}$Al($p,\gamma$)$^{26}$Si rate. [Preview Abstract] |
Tuesday, May 3, 2011 11:57AM - 12:33PM |
X3.00003: New Developments in the DOE Isotope Production and Application Program Invited Speaker: |
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