Cosmic-Ray Neutron Production in Elements as a Function of Latitude and Altitude

1953 ◽  
Vol 90 (1) ◽  
pp. 44-50 ◽  
Author(s):  
J. A. Simpson ◽  
R. B. Uretz
Keyword(s):  
Cosmic Ray ◽  
Neutron Production

Neutron production by cosmic-ray particles at sea level and underground

1951 ◽  
Vol 8 (5) ◽  
pp. 326-340 ◽  
Author(s):  
R. D. Sard ◽  
M. F. Crouch ◽  
D. R. Jones ◽  
A. M. Conforto ◽  
B. F. Stearns
Keyword(s):  
Sea Level ◽  
Cosmic Ray ◽  
Neutron Production

Fast neutrons at LNL Legnaro

2020 ◽  
pp. 1-15
Author(s):  
Pierfrancesco Mastinu ◽  
Dario Bisello ◽  
Rogelio Alfonso Barrera ◽  
Ignacio Porras ◽  
Gianfranco Prete ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Neutron Production ◽  
Fast Neutrons ◽  
General Interest ◽  
Air Showers ◽  
Space Applications ◽  
Microelectronic Devices ◽  
Energy Peak ◽  
Under Construction ◽  
Production Target

In this contribution we describe NEPIR, the fast-neutron irradiation facility under construction at the 70 MeV cyclotron SPES facility of the INFN laboratory of Legnaro (LNL). NEPIR will be constructed in stages, according to the available funds. The initial configuration, based on a thick Be neutron production target, will be operational in 2022; it will be used for shielding studies against fast neutrons for space applications and to investigate neutron-induced Single Event Effects (SEE) in microelectronic devices and systems. In its final configuration NEPIR will have two target systems: one will deliver a Quasi Mono-energetic Neutron (QMN) beam, of general interest, with an adjustable energy peak in the 20–70 MeV range; the second target will deliver a specialized continuous energy neutron beam for studying the effects of fast neutrons produced in cosmic ray air-showers in electronic devices and systems. We review the use of NEPIR to characterize the sensitivity of electronics, describe the neutron production targets and the facility layout. In closing we describe ways, presently under investigation, to use the 15 MV XTU Tandem of LNL to produce nearly monochromatic fast neutrons that would complement the QMN system by allowing one to probe for SEE below 20 MeV.

Further Results on Neutron Production by Cosmic-Ray Particles at Sea Level

1949 ◽  
Vol 76 (8) ◽  
pp. 1134-1136 ◽  
Author(s):  
R. D. Sard ◽  
A. M. Conforto ◽  
M. F. Crouch
Keyword(s):  
Sea Level ◽  
Cosmic Ray ◽  
Neutron Production

Time and other Variations in the Intensity of Cosmic Ray Neutrons

1951 ◽  
Vol 6 (11) ◽  
pp. 592-598
Author(s):  
N. Adams ◽  
H. J. J. Braddick
Keyword(s):  
Cosmic Rays ◽  
Solar Flare ◽  
Diurnal Variation ◽  
Sea Level ◽  
Geomagnetic Latitude ◽  
Cosmic Ray ◽  
Temporal Variations ◽  
Neutron Production ◽  
Neutron Intensity

AbstractWe have measured the barometer coefficient of cosmic ray neutron production at sea level and find the value -9,25% ± 0,20/cmHg. We have shown that there is no diurnal variation of neutron production of amplitude greater than about 0,4 %. The effects of the large solar flare of November 19 th , 1949 on cosmic ray neutrons were much greater than on ionising cosmic rays at sea level; the maximum factor of increase was more than 5 and the intensity remained measurably above normal for about 12 hours. A small increase of neutron intensity is found, statistically, to be correlated with a number of recorded radio fade-outs. It is suggested that neutron measurements are particularly suitable for studying temporal variations of cosmic rays. The latitude increase of cosmic ray neutrons between geomagnetic latitude 54,5° and 56,5° was found to be about 2%. No certain increase was found between 56,5° and 59,5°.

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