"New Modular Total Absorption Spectrometer at the HRIBF (ORNL, Oak Ridge)* "
Marzena Wolińska-Cichocka, ORAU / ORNL
(id #121)
Seminar: NoPoster: Yes
Invited talk: No
M. Wolińska-Cichocka1,2, K.P. Rykaczewski2, R.K. Grzywacz2,3, M. Karny1,2,4, A. Kuźniak4, B.C. Rasco2,5,
1 ORAU, Oak Ridge, TN 37830, USA,
2 ORNL, Oak Ridge, TN 37830, USA,
3 University of Tennessee, Knoxville, TN 37996, USA,
4 University of Warsaw, Warsaw, PL 00-681, Poland,
5 Smarter Than You Software, Seattle, WA 98109, USA,
A new detector, the Modular Total Absorption Spectrometer (MTAS) is under construction at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. This detector is designed to efficiently measure the gamma radiation emitted in the decay of radioactive nuclei. The studies of beta-gamma strength pattern including so called “decay heat” released in the decay of fission products occurring in the nuclear fuels [1] are among the goals of the project. Neutron-rich nuclei produced in the proton-induced fission of 238U at the HRIBF will be studied with MTAS using the ranging-out method [2,3]. These measurements of true beta-strength distribution will help develop the microscopic description of neutron-rich matter.
The detector array consists of 19 NaI(Tl) hexagonal shape blocks, each 21" long and 6.92" measured face to face. The modular design of MTAS enables the construction of a detector with a very large active volume. The housing of the individual modules is kept at the minimum (~0.8 mm carbon fiber) to reduce gamma absorption effects. The photo-peak efficiency is expected to reach nearly 90% around 300 keV and over 75% for a
5 MeV single gamma transition [4].
The details of the design and the results of first tests of individual MTAS modules will be presented.
*We acknowledge the support of the U.S. Department of Energy through Contract DE-AC05-00OR2272 (ORNL).
[1] “Assessment of Fission Product Decay Data for Decay Heat Calculations”, Nuclear Science NEA/WPEC-25 report, NEA No. 6284, OECD (2007).
[2] C.J. Gross et al., Eur. Phys. J. A25, S01, 115 (2005).
[3] J. A. Winger et al., Phys. Rev. Letters, 102, 142502 (2009).
[4] B.C. Rasco, GEANT4 simulations (2010).
1 ORAU, Oak Ridge, TN 37830, USA,
2 ORNL, Oak Ridge, TN 37830, USA,
3 University of Tennessee, Knoxville, TN 37996, USA,
4 University of Warsaw, Warsaw, PL 00-681, Poland,
5 Smarter Than You Software, Seattle, WA 98109, USA,
A new detector, the Modular Total Absorption Spectrometer (MTAS) is under construction at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. This detector is designed to efficiently measure the gamma radiation emitted in the decay of radioactive nuclei. The studies of beta-gamma strength pattern including so called “decay heat” released in the decay of fission products occurring in the nuclear fuels [1] are among the goals of the project. Neutron-rich nuclei produced in the proton-induced fission of 238U at the HRIBF will be studied with MTAS using the ranging-out method [2,3]. These measurements of true beta-strength distribution will help develop the microscopic description of neutron-rich matter.
The detector array consists of 19 NaI(Tl) hexagonal shape blocks, each 21" long and 6.92" measured face to face. The modular design of MTAS enables the construction of a detector with a very large active volume. The housing of the individual modules is kept at the minimum (~0.8 mm carbon fiber) to reduce gamma absorption effects. The photo-peak efficiency is expected to reach nearly 90% around 300 keV and over 75% for a
5 MeV single gamma transition [4].
The details of the design and the results of first tests of individual MTAS modules will be presented.
*We acknowledge the support of the U.S. Department of Energy through Contract DE-AC05-00OR2272 (ORNL).
[1] “Assessment of Fission Product Decay Data for Decay Heat Calculations”, Nuclear Science NEA/WPEC-25 report, NEA No. 6284, OECD (2007).
[2] C.J. Gross et al., Eur. Phys. J. A25, S01, 115 (2005).
[3] J. A. Winger et al., Phys. Rev. Letters, 102, 142502 (2009).
[4] B.C. Rasco, GEANT4 simulations (2010).
