The Cosmic Ray Induced Neutron Spectrum at the Summit of the Zugspitze (2963m)

Neutron spectrometry at high mountain observatories

“…2a, the experimental neutron spectrum measured on the Matterhorn is shown together with the calculated data of Merker, and with the FLUKA code simulation results for Zugspitze (2963 m, geographical position 47 25 0 N; 11 E (Schraube et al, 1997). The wide energy range system is capable of reconstructing the two peaks of the neutron spectrum: the first one at about 1 MeV (evaporative contribution) and the second one around 100 MeV.…”

Measurement of cosmic-neutron energy spectrum at the summit of Mt. Fuji

“…There have been many experiments to acquire cosmic-neutron measurements in aircraft and on mountains but not as many reports of the energy spectrum (Florek et al, 1996;Goldhagen, 2000;Goldhagen et al, 2002;Kowatari et al, 2005;Nakamura et al, 1987;Schraube et al, 1997), and these measurements were furthermore performed using a multimoderator spectrometer, the so-called Bonner sphere. Although a well examined cosmic-neutron energy spectrum is necessary to determine an accurate cosmic-neutron dose, because the fluence-toambient dose equivalent conversion coefficients depend on neutron energy, there is still some uncertainty in these results particularly in the high-energy region due to the absence of verification by other neutron spectrometers.…”

Evaluation of Geomagnetic Latitude Dependence of the Cosmic-ray Induced Environmental Neutrons in Japan

“…[1][2][3][4][5][6][7] Very few results on cosmic-ray neutrons at sea level in Japan have been available. 8) In recent years, several experiments have been performed at low geomagnetic latitudes.…”