Development of radioactive beams at LAMPF for a high precision test of the standard model and as a step towards an IsoSpin Laboratory

摘要

The main objective of this project is to design, fabricate, install, and make operational a thin-target, He-jet system at LAMPF to provide high-intensity Cs-(125 to 139) isotopes for an atomic parity nonconservation (PNC) experiment and as a robust production source for radioactive beams. The experiment seeks to measure the 6S-7S PNC transition rate for this series of Cs isotopes. From the ratios of these rates measured in the different isotopes, a fundamental test of the standard model can be made at the level of 0.2%. Herein, we describe the successful operation of a thin- target, He-jet system operating at primary beam intensities of up to 700 micro-A with production yields of 10,000,000 to 100,000,000 atoms/s for a wide range of nonvolatile and Cs radioisotopes. 7 refs., 3 figs.