Nuclear [beta] decay has a long-standing history of shaping and testing the standard model of particle physics, and it continues to this day with elegant, ultra-precise low-energy nuclear measurements. Experiments observing the angular correlations between the electron, neutrino and recoil momenta following the [beta] decay of (un)polarized nuclei can be used to search for exotic currents contributing to the dominant V – A structure of the weak interaction. Precision measurements of the correlation parameters to < 0.1% would be sensitive to (or meaningfully constrain) new physics, complementing other searches at large-scale facilities such as the LHC. Ion and atom traps provide an ideal source of very cold, short-lived radioactive nuclei in an extremely clean and open environment. As such, they are invaluable tools for precision measurements of [beta]-decay parameters which are sensitive to physics beyond the standard model. This talk will outline three such efforts. At TRIUMF in Vancouver, Canada, the TRINAT collaboration has demonstrated the ability to highly polarize (>99%) 37K atoms and measure the [beta] asymmetry parameter, A_β, to 0.3%. The TAMUTRAP facility at the Cyclotron Institute, Texas A&M University, will utilize a unique cylindrical Penning trap – by far the world’s largest ion trap with an inner diameter of 180 mm – to measure the [beta]-delayed proton decays of neutron-deficient nuclei. The 6He b collaboration is adapting the exquisitely precise cyclotron radiation emission spectroscopy (CRES) technique developed by Project 8 to search for evidence of tensor interactions in the energy spectrum from the [beta] decay of 6He. The status and goals of these projects will be described.

The 2020 Fall Meeting of the Division of Nuclear Physics of the American Physical Society will be held Oct. 29 - Nov. 1, 2020 https://indico.frib.msu.edu/e/DNP2020Fall

The National Synchrotron Light Source II (NSLS-II) is a 3 GeV , low emittance (H: 1 nm-rad and V: 8 pm-rad), high brightness third generation synchrotron light source at Brookhaven National Lab. It is to deliver a broad range of light to 60-70 beamlines at full built-out. The storage ring was commissioned in 2014 and began its routine operations in the December of the same year. Since then, we have been continuously installing and commissioning new insertion devices and beamlines. At this point the facility hosts 28 beamlines to deliver light from Infrared to hard x-ray. Over the past five years, the storage ring performance continuously improved, including 500 mA demonstration and 400 mA routine top off operation. In FY20, we delivered 5400 hrs beam time with 97% operation reliability. Towards the future, a program to explore upgrade paths for the NSLS-II was initiated in 2019, with the goal of dramatically increasing its brightness and flux, which requires significantly lower emittance. Instead of following the Multi-Bend Achromat (MBA) lattice approach, recently we proposed an alternative way to reach low emittance by use of a lattice element that we call 'Complex Bend'. The Complex Bend is a new concept of bending magnet consisting of a number of dipole poles with strong alternate focusing to maintain the beta-function and dispersion oscillating at very low values, thus reach low emittance. Candidate lattices have achieved ~30 pm-rad emittance with 5 mm on-momentum dynamic aperture to allow off-axis injection.

The advent of high precision measurements of neutrinos and their oscillations calls for accurate predictions of their interactions with nuclear targets utilized in the detectors. Achieving a comprehensive description of the different reaction mechanisms active in the broad range of energy relevant for oscillation experiments is a formidable challenge for both particle and nuclear Physics. I will present an overview of recent developments in the description of electroweak interactions within nuclear many-body approaches and discuss the future perspectives to support the experimental effort in this new precision era.

Hosts: Alex Gade and Sanjay Reddy and Panelists: Andrew Cumming and Zach Meisel

Due to the spread of COVID-19, the ISNET Local Organizing Committee will postpone the in-person conference for 2021. Virtual pre-conference December 14-18 2020, updates will follow. Thank you for your understanding. The Virtual pre-conference will be held from December 14 to 18 2020; in the format of 30-40 min. talk with 20-30 min. for discussions led by a panel and the speaker. A few ideas for lectures are: 1. Bayesian Basics 2. Model Emulation 3. Model Mixing 4. ML techniques for statistical analysis 5. Advanced Statistics Techniques for Analyzing Experimental Data 6. Resampling Techniques (e.g. bootstrap) Please contact us should you have any questions or ideas at isnet@frib.msu.edu