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WNPPC Prep 1

Fri., Feb. 7, 2020 3:30 p.m. - Fri., Feb. 7, 2020 4:30 p.m.

Location: CL 112

High-precision half-life measurement of 14O

Abstract:  Precision measurements of the ft values for Superallowed Fermi beta decays between nuclear isobaric analogue states of spin-parity Jπ = 0+ provide fundamental tests of the electroweak interaction. These transitions are used to constrain the conserved vector current (CVC) hypothesis and they provide the most precise value of Vud, the up-down element of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix. A high precision half-life measurement for 14O, one of these superallowed emitters, has recently been performed at the Isotope Separator and Accelerator (ISAC) facility at TRIUMF. The half-life of 14O was deduced using a 4π gas-filled proportional counter and fast tape transport system. This analysis has led to a new result that is 2 times more precise than the world average, T1/2(14O)= 70.619(11) s, obtained from 10 previous measurements of this quantity. Details of this new measurement and its impact on the ft value for 14O will be presented.

Speaker: Shivani Sharma, Department of Physics, University of Regina

Deep Exclusive π− Production with SoLID

Abstract:  SoLID (Solenoidal Large Intensity Device) is an upcoming high acceptance detector at Jefferson Lab. SoLID will utilise the latest detector technology to allow for accurate measurements at higher luminosities than currently possible for other large acceptance detectors currently available at Jefferson Lab. The proposed measurement of deep exclusive π− production from the neutron in a polarised 3He target using SoLID makes full use of these capabilities; in particular to measure several key single-spin asymmetries. These polarisation observables open a window into novel aspects of nucleon structure, and also play a role in the reliable extraction of the charged pion form factor from pion electroproduction measurements. These measurements are highly complementary to other experiments carried out at Jefferson Lab. In this talk, I will outline the experimental proposal as well as the capabilities and parameters of the SoLID.

Speaker: Dr. Stephen Kay, Department of Physics, University of Regina