Bulletin of the American Physical Society
2013 Fall Meeting of the APS Division of Nuclear Physics
Volume 58, Number 13
Wednesday–Saturday, October 23–26, 2013; Newport News, Virginia
Session KA: DNP Awards Session |
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Chair: Bob Mckeown, Thomas Jefferson National Accelerator Facility Room: Grand Ballroom I |
Friday, October 25, 2013 2:00PM - 2:36PM |
KA.00001: Mentoring Award Talk Invited Speaker: Benjamin Zeidman Nuclear Physics is an expanding science with an ever increasing number of applications which can provide a meaningful career that is both stimulating and fun. It will be a pleasure to briefly share some of the joys of interacting with many distinguished physicists and with younger physicists whose futures lie ahead of them. [Preview Abstract] |
Friday, October 25, 2013 2:36PM - 3:12PM |
KA.00002: Dissertation Award Winner: First Determination of the Proton's Weak Charge from the Qweak Experiment Invited Speaker: Katherine Myers The Qweak experiment at the Thomas Jefferson National Accelerator Facility has measured the parity-violating asymmetry in elastic electron-proton scattering at low momentum transfer, Q$^2$ = 0.025 GeV$^2$. This asymmetry is proportional to the weak charge of the proton and can be related to the electroweak mixing angle of the Standard Model. The experiment will ultimately provide the most precise measurement of the weak mixing angle at low energy to date, challenging the predictions of the Standard Model and probing certain types of new physics up to the TeV scale. Details of how this challenging measurement was performed and the first results from the measurement with the extracted weak charge of the proton will be presented. [Preview Abstract] |
Friday, October 25, 2013 3:12PM - 3:48PM |
KA.00003: How to precisely weight one of the most exotic nuclei Over the past years, several technical developments in radioactive ion beam delivery and trapping have allowed the precise mass measurement of increasingly exotic nuclei, reaching both drip lines. Excessive surface-ionizable contamination, which often prevents measurements of exotic nuclei produced at low yield, however remained a constraint. This issue was recently medicated with the use, for the first time on-line, of an ion guide-laser ion source. This technique was used to achieve a 6-fold suppression of surface-ionized contamination resulting in the weighting of 21Mg and 20Mg, the most proton-rich nuclei to be trapped. Furthermore, both measurements resulted in a severe breakdown of the once robust isobaric mass multiplet equation (IMME). This equation, which relates the masses of isobaric analogue states, is an important tool for predicting unmeasured masses of nuclei near the proton drip line, such as two-proton radioactivity candidates. The significant departure from the quadratic form of the IMME that we observed cannot be accounted by shell model calculations, which could potentially point to new effects not included in sd-shell interactions. Hence, more precise experimental data of very proton-rich nuclei are required to help refine nuclear interactions and better predict the relationship between the masses of isobaric analogue states. [Preview Abstract] |
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