Beta decay studies of r-process nuclei at the National Superconducting Cyclotron Laboratory

通过天然锑的质子轰击生产$\n\thrm{^{117m}Sn}$与$\n\thrm{^{119m}Te}$及其对带电粒子反应建模的启示

$\mathrm{^{117m}Sn}$ and $\mathrm{^{119m}Te}$ Production via Proton Bombardment on Natural Antimony and Implications for Modeling Charged Particle Reactions

本研究通过多实验室实验测量了天然锑质子轰击下相关核素的反应截面，同时结合实验数据优化TALYS 1.95的质子反应建模参数，为放射性核素生产和核反应建模提供支撑。

Next Generation Muon g-2 Experiment at FNAL

The precise measurement of the muon anomalous magnetic moment $a_\mathrmμ$ has stimulated much theoretical and experimental efforts over more than six decades. The last experiment at Brookhaven National Laboratory, Upton, NY, USA obtained a value more than three standard deviations larger than predicted by the Standard Model of particle physics, and is one of the strongest hints for physics beyond the Standard Model. A new experiment at Fermi National Accelerator Laboratory, Batavia, IL, USA to measure $a_\mathrmμ$ with fourfold increased precision to $140\,\mathrm{ppb}$ is currently in its co…

$C_5^A$ axial form factor from bubble chamber experiments

A careful reanalysis of both Argonne National Laboratory and Brookhaven National Laboratory data for weak single pion production is done. We consider deuteron nuclear effects and normalization (flux) uncertainties in both experiments. We demonstrate that these two sets of data are in good agreement. For the dipole parametrization of $C_5^A(Q^2)$, we obtain $C_5^A(0)=1.19\pm 0.08$, $M_A=0.94\pm 0.03$ GeV. As an application we present the discussion of the uncertainty of the neutral current 1$π^0$ production cross section, important for the T2K neutrino oscillation experiment.

Search for a Possible Spontaneous Emission of Muons from Heavy Nuclei

A search for an exotic natural radioactivity of lead nuclei, using nuclear emulsion sheets as detector, is described. We discuss the experimental set-up of a test performed at the Gran Sasso National Laboratory (Italy), the event simulation, data analysis and preliminary results.

Highlights from RHIC Plus some earlier BNL Highlights in Subnuclear Physics

Highlights of the contributions of Brookhaven National Laboratory to Subnuclear Physics are presented together with recent highlights from RHIC

Half Life of the Doubly-magic r-Process Nucleus 78Ni

Nuclei with magic numbers serve as important benchmarks in nuclear theory. In addition, neutron-rich nuclei play an important role in the astrophysical rapid neutron-capture process (r-process). 78Ni is the only doubly-magic nucleus that is also an important waiting point in the r-process, and serves as a major bottleneck in the synthesis of heavier elements. The half-life of 78Ni has been experimentally deduced for the first time at the Coupled Cyclotron Facility of the National Superconducting Cyclotron Laboratory at Michigan State University, and was found to be 110 (+100 -60) ms. In the sa…

Highlights from BNL and RHIC 2017

Highlights of news from Brookhaven National Laboratory (BNL) and results from the Relativistic Heavy Ion Collider (RHIC) in the period July 2016-2017 are presented. 2017 was the 70th birthday of Brookhaven National Laboratory which was built starting in 1947 on Camp Upton, a military base in 1917 for World War I and in September 1944 for World War II. Highlights in 70 years of research at BNL are presented, which include 6 Nobel Prizes as well as other important discoveries and inventions. RHIC is the world's only polarized proton collider and a review of the establishment of the Riken BNL Res…

Low energy neutron background in deep underground laboratories

The natural neutron background influences the maximum achievable sensitivity in most deep underground nuclear, astroparticle and double-beta decay physics experiments. Reliable neutron flux numbers are an important ingredient in the design of the shielding of new large-scale experiments as well as in the analysis of experimental data. Using a portable setup of He-3 counters we measured the thermal neutron flux at the Kimballton Underground Research Facility, the Soudan Underground Laboratory, on the 4100 ft and the 4850 ft levels of the Sanford Underground Research Facility, at the Waste Isola…

New precision measurements of free neutron beta decay with cold neutrons

Precision measurements in free neutron beta decay serve to determine the coupling constants of beta decay, and offer several stringent tests of the Standard Model. This paper describes the free neutron beta decay program planned for the Fundamental Physics Beamline at the Spallation Neutron Source at Oak Ridge National Laboratory, and puts it into the context of other recent and planned measurements of neutron beta decay observables.