Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session FA: Neutrinos and Fundamental Symmetries |
Hide Abstracts |
Chair: Wick Haxton, University of California, Berkeley Room: Sweeny A |
Thursday, November 4, 2010 4:00PM - 4:36PM |
FA.00001: Neutrino Mixing of $^{8}$B Solar Neutrinos Invited Speaker: The Sun is a copious source of neutrinos. Since Ray Davis' pioneering experiment at the Homestake mine four decades ago, terrestrial experiments have been using solar neutrinos to investigate the properties of neutrinos and to probe the solar core. The long-standing Solar Neutrino Problem was finally resolved by the Sudbury Neutrino Observatory (SNO) experiment nearly a decade ago, when it simultaneously observed a deficit of electron-type neutrinos and a congruence of the measured total active neutrino flux with predictions from solar models. This difference in the electron-type neutrino flux and the total active neutrino flux is direct evidence for neutrino mixing. Since then there have been tremendous progress worldwide in measuring the neutrino mixing parameters $\theta_{12}$ and $\Delta m_{12}^2$ using $^{8}$B solar neutrinos. In this talk, I will review the current status of these measurements. In particular, I will discuss recent results by the SNO experiment and their implications for our understanding of the neutrinos. [Preview Abstract] |
Thursday, November 4, 2010 4:36PM - 5:12PM |
FA.00002: Neutrino Mixing of 7-Beryllium and Low-Energy 8-Boron Solar Neutrinos Invited Speaker: I will review and discuss recent results on the mixing of low- and intermediate-energy solar neutrinos, obtained with the most recent searches for solar neutrinos. I will review the perspective for future findings in this field. [Preview Abstract] |
Thursday, November 4, 2010 5:12PM - 5:48PM |
FA.00003: Standard Model and Beyond with Neutron Beta Decay Experiments Invited Speaker: The underlying charge-current weak interaction of the neutron beta decay connects together the Fermi constant $G_F$, CKM matrix element $V_{ud}$, the nucleon axial weak coupling constant $g_A$, and the free neutron life time $\tau_{n}$. Consequently, the combination of direct measurements of these provides stringent constraints to the Standard Model. At present, $G_F$ and $V_{ud}$ have been measured to a precision of 5 ppm and 225 ppm, respectively, whereas the data in $g_A$ and $\tau_n$ are less precise, and both exhibit significant inconsistency among measurements. With polarized neutrons, $g_A$ can be determined by measuring the angular correlation of the decay electrons with the neutron spin (so-called $\beta$-asymmetry). In the past, $\beta$-asymmetry have been measured in the cold neutron beam experiments, yielding a range of results much wider than the reported uncertainties. A new $\beta$-asymmetry measurement, UCNA (Ultracold Neutron Asymmetry), has been developed using the solid deuterium pulse spallation ultracold neutron (UCN) source at the Los Alamos Neutron Science Center, where UCN are transported in a guide system, fully polarized, then loaded into a decay trap within a solenoidal beta spectrometer. Utilizing UCN give this experiment very different systematics compared to cold neutron experiments. In this talk, I will give a brief review of the neutron beta decay measurements on the angular correlations as well as the life time. The main focus of this talk will be on the UCNA experiment. I will discuss the experimental techniques, and present the new results from the data in 2008 and 2009. The implication of the new results, combined with the world data on $\beta$-asymmetry, $V_{ud}$, and $\tau_{n}$, will also be discussed. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700