Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Mon., July 21, 2014, at 3:00 PM - 4:00 PM (refreshments served at 2:40 PM)

Neutron Spectroscopy without Time-of-Flight: (d,n) and α,n) Measurements Using a DSP-Based Deuterated Scintillator Array

Michael Febbraro, University of Michigan, Ann Arbor, MI
ORNL, Bldg. 6008 Large Conference Room

Deuterated liquid scintillation detectors have shown promising results as neutron spectrometers for nuclear structure and astrophysics studies with stable and radioactive nuclear beams. Unlike normal hydrogen-based scintillators, they can provide neutron spectroscopic information without time-of-flight (ToF), allowing for close proximity to the neutron source for good angular coverage and absolute detector efficiency. Likewise DC-beams can then be used with higher intensity than a typical pulsed beam, resulting in a significant advantage. We have developed, extensively evaluated and fully characterized an array of such detectors (The University of Michigan Deuterated Scintillator Array: UM-DSA). Digital Pulse-Shape Discrimination (DPSD) using fast waveform digitizers is employed to permit not only separation of neutron and gamma events but also various recoils from nuclear reactions within the scintillator with subsequent improvements in the neutron spectra extracted. The instrumental techniques and detector developmental program will be discussed, along with spectral unfolding. Finally, a series of (d,n), and 13C(α,n)16O experiments performed at the University of Notre Dame Nuclear Structure Laboratory will be used to illustrate the advantage of these detectors for nuclear reaction measurements, including those using exotic beams. This work supported by US NSF and US DHS.

Contact: Alfredo Galindo-Uribarri, (865) 574-6124