Mr Shree Neupane (Central Michigan University)
The mass of the isotope is an important parameter in Nuclear Astrophysics to model various stellar processes. Among the various methods used to measure mass of isotopes, Time-of-Flight Mass measurement technique is suitable for very unstable isotopes. This technique is based on measuring the time-of-flight and magnetic rigidity of isotopes with high precision in a beam of fast ions. The requirement of precise mass measurement of isotopes push us to build a timing Detector with good resolution. We have setup a work station at Central Michigan University to build and test the fast-timing detector. We are using Hamamatsu R4998 and R7400U Photomultiplier Tubes; and BC-418 and EJ-228 plastic scintillators to build a prototype detector. We will test different options for electronics. The test setup includes a pico-second laser to provide a signal source. Our goal is to develop timing detectors with a resolution of 10 ps (root mean square) to be used in upcoming time-of-flight experiments with the S800 spectrometer at the NSCL. We will present preliminary results for test of a prototype detector using four R4998 photomultiplier tubes.
Mr Shree Neupane (Central Michigan University) alfredo estrade (CMU)