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We carried out simultaneous measurement of SERs and cosmic ray neutron spectra for the first time. We measured SERs using 90 nm CMOS SRAM chips and measured neutron spectra using a Bonner multisphere spectrometer. We carried out the SER field measurement at the 4200 m summit of Mauna Kea, which is the most suitable place for SER field measurements because the neutron flux is over 10 times greater...
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