Analysis of Single-event Upset for SRAM Devices by Using the MC-50 Cyclotron

Neutron spectra produced by 30, 35 and 40 MeV proton beams at KIRAMS MC-50 cyclotron with a thick beryllium target

“…[17,18], the neutron spectra produced by a thick beryllium target at different proton energies provided by the MC-50 cyclotron of the KIRAMS were simulated by using the GEANT4 code [21,22]. By using the simulated neutron flux and the experimentally measured SEU of several RAM devices, the SEU cross-sections were obtained and found in agreement with those obtained at other facilities within a factor of $ 2.…”

“…GEANT4 is a particle transport code and is widely used for simulations in diverse scientific fields, such as medical physics [24][25][26], accelerator induced radiation [17,18,27], neutron shielding [28][29][30], and environment radiation [31][32][33][34]. The details of the GEANT4 code can be found on the web [35].…”

“…Neutron beams with broad energy spectra can be produced through 9 Be(p,n) reactions by using the MC-50 cyclotron of the Korea Institute of Radiological Medical Sciences (KIRAMS) which is usually utilized for the production of medical isotopes. These neutrons can be used for various purposes, including studies of irradiation effects of neutrons on single event upsets (SEU) of RAM devices [17,18], materials [19] and bio-sciences [20].…”

“…By using the simulated neutron flux and the experimentally measured SEU of several RAM devices, the SEU cross-sections were obtained and found in agreement with those obtained at other facilities within a factor of $ 2. However, the energy and angular distributions of neutrons used in these analyses [17,18] were based on the simulation results obtained by the physics models provided in the GEANT4 code version 9.2p01 and are bound to have some uncertainties. Therefore, verification of the simulated neutron spectra provided by the MC-50 cyclotron is still needed.…”

Measurements of 89Y(n,2n)88Y and 89Y(n,3n)87Y, 87mY cross sections for fast neutrons at KIRAMS

“…By using a subtraction method [13], we can extract the cross sections at the central value of the neutron Gaussian peak. The cross section at the neutron energy of 34.8 MeV can be extracted by the following…”