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The University of Tennessee

Department of Physics and Astronomy

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LeRIBSS Resources






MTAS wiki


Moving Tape Counter Manual (pdf)

MTC Time Cycle Guide (pdf)


LeRIBSS Pixie16 DAQ User Guide

DAQ Quick Start Guide (pdf)

Pixie Manual (pdf)


MPOD Local user guide (pdf)

Wiener MPOD manual (pdf)

Wiener MPOD information (pdf)


LeRIBSS slide presentation


Useful Numbers


LeRIBSS Beamline Injector 574 4767
LeRIBSS Counting Room 576 7388
HRIBF Control Room 574 4720

    Contact Information


Prof. Krzysztof Rykaczewski
Building 6000, M.S. 6371,
Oak Ridge National Laboratory,
P.O. Box 2008,
Oak Ridge, TN 37831-6371.
Phone: (865) 576-2636


Dr. Robert Grzywacz
220 Ayres Hall,
Knoxville, TN  37996.
Phone: (865) 974-2918, 574 4732(ORNL)


Low Energy RIB Spectroscopy Station (LeRIBSS)

The new Low Energy Radioactive Ion Beam Spectroscopy Station (LeRIBSS) is Holifield Radioactive Ion Beam Facilities newly developed experimental endstation, which was conceived and developed by a team of ORNL physicists led by Krzysztof Rykaczewski and Carl Gross. LeRIBSS takes advantage of most HRIBF beam purity developments and combined with up to 100 times more intense beams than previously available in both positive and negative charges states, this powerful new device will allow previously impossible exciting experiments to be performed.

LeRIBSS is located at the bottom of the HRIBF Tandem accelerator. It utilises the high resolution RIB injector magnet to provide high quality and high intensity low-energy RIBs produced at the IRIS-1 (and IRIS-2) ion sources.

The station comprises steering and focussing beam transport elements; beam diagnostic monitors; a miniature ion counting Micro-Channel Plate (MCP) detector (ORNL/UT) or Silicon detector; a new fast-moving tape collector (MTC) (LSU); the Clover Array for Recoil Decay Spectroscopy (CARDS) which can accomodate up to 8 large volume Clarion-type HPGe Clover detectors and/or a fast timing BaF2 array, high resolution electron detectors, β-counters and a high efficiency β-delayed neutron detector.

LeRIBSS is fully instrumented with the 100-Mega Samples per Second digital data acquisition system Pixie16 (UT/ORNL).

LeRIBSS is a collaboration between Physics Division Oak Ridge National Laboratory, the University of Tennessee, Louisiana State University, Mississippi State University, the Universities Radioactive Ion Beam (UNIRIB) consortium and Vanderbilt University .


Front end of LeRIBSS. CARDS with  Clovers installed is on the left. The beam diagnostics and steering magnets are visible on the right.


Left to right: MTC, lead shielding & CARDS mount

Left to right: Glass plate for quartz viewer, the "sputnik" chamber with MCP and MTC tape centred in the CARDS ring

The new MTC chamber designed and fabricated by Ed Zganjar (LSU), bottom left . Shown is the tape storage area through a plastic panel. The mechanical assembly is on the left of the casing.