Design of Wide-energy-range Neutron Calorimeter for Nuclear Collisions in the Korea Rare-isotope Accelerator
- Authors
- Hong, Byungsik; Jhang, Genie; Joo, Eunah; Lee, Kyong Sei; Shim, Hyunha
- Issue Date
- 2월-2011
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Neutron calorimeter; Symmetry energy; Equation of state; Heavy-ion collision; Korea rare-isotope accelerator
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.58, no.2, pp.211 - 222
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 58
- Number
- 2
- Start Page
- 211
- End Page
- 222
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/113198
- DOI
- 10.3938/jkps.58.211
- ISSN
- 0374-4884
- Abstract
- We have designed a neutron calorimeter dedicated to the measurement of the nuclear symmetry energy in the planned Korea rare-isotope accelerator. The design was optimized to precisely measure the neutron energy with high efficiency in a wide energy range from about 30 to 300 MeV. The final configuration of the detector is a hybrid of the homogeneous and the sampling calorimeters with a veto counter in the front. The homogeneous part is ideal for measuring low-energy neutrons below similar to 50 MeV whereas the sampling part is efficient for measuring high-energy neutrons. The detection efficiency is estimated to be about 88% for neutron energies larger than 50 MeV and decreases to similar to 78% at 30 MeV. We have estimated the energy resolution as a function of the incident energy based on the time-of-flight method. Assuming an ideal detector performance with null time resolution, the relative energy resolution decreases as the incident neutron energy increases. However, under a more realistic situation with a finite time resolution for the detector, the energy resolution monotonically increases with increasing the neutron energy, following a logarithmic function. Imposing an energy resolution of better than 3% at the highest neutron energy, we find the nominal position of the hybrid calorimeter to be 15 m from the target for a time resolution of 1.0 ns, but the detector needs to be free to move closer to or farther from the target, depending on the physics goal.
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