A neutron detector array will be essential for the study of the nuclear symmetry energy in the large-acceptance multipurpose spectrometer (LAMPS) at the planned rare-isotope beam facility RAON in Korea. We have built the prototype neutron detector for LAMPS and examined its performance by using radiation sources. For data taking, we tested the voltage-threshold discriminator (VTD) and the constant-fraction discriminator (CFD) modules for the pulse process. The intrinsic time resolution of the prototype detector is estimated to be 723 ps for VTD and 488 ps for CFD. The fission neutrons and gammas emitted from 252Cf can be clearly separated in the time distribution. We reconstruct the energy spectrum of the spontaneous fission neutrons from 252Cf, which can be described well by using the empirical Watt spectrum.
Bibliographical noteFunding Information:
We acknowledge support from the Rare-isotope Science Project (RISP) of the Institute for Basic Science (IBS). This work was supported by the National Research Foundation of Korea (Grants No. NRF-2012M7A1A1A00009 and NRF-2012M7A1A2055596).
- Constant-fraction discriminator
- Heavy-ion collision
- Neutron detector
- Nuclear symmetry energy
- Voltage-threshold discriminator
ASJC Scopus subject areas
- Physics and Astronomy(all)