A pair spectrometer is available for use with the
tape transport system
at the recoil mass spectrometer
It consists of two silicon
detectors between which the thin tape may travel.
Some nuclear de-excitations, such as transitions between two 0+ states,
are forbidden to proceed via gamma-ray emission. In these instances,
electric monopole transitions proceed through the emission of an
atomic electron. Internal pair formation can compete with these
transitions, particularly when the excitation energy is high and the atomic
number is low. The spectrometer will increase the probability that
the E0 decays between
0+ states can then be observed. In addition, the compact system
would allow two Ge detectors to be positioned close to the tape
ensuring large solid angle coverage. It may also be possible to
place this device inside a large
This system is available from Louisiana State University.
For questions about this page please contact the HRIBF User Liaison.
This file last modified Wednesday July 27, 2005