Die Absorption der Nukleonenkomponente der kosmischen Strahlung in Luft zwischen Seehöhe und 4000 m

Abstract

Durch Beobachtung der Zahl der Kern Zertrümmerungen in photographischen Emulsionen wird die Absorption der Nukleonenkomponente der kosmischen Strahlung in Luft zwischen Seehöhe und 3774 m untersucht.

Scaling factors for production rates of in situ produced cosmogenic nuclides: a critical reevaluation

“…This observation is in agreement with the ¢nding of Simpson and Uretz [3] that 1 increases with increasing altitude. The data of [18,22,23] are internally consistent as all investigators used identical photographic emulsions (Ilford G5) and screening procedures. Furthermore, the photographic emulsions reliably record tracks of all nuclear disintegrations induced by cosmic rays, i.e.…”

“…in situ produced cosmogenic nuclides) occurring at exactly the same interface. Hence, the values for 1 derived from the photographic emulsion studies used in this paper [18,22,23] probably best describe the altitude dependence of in situ production of cosmogenic nuclides at the air^surface interface.…”

“…The range in high latitude values for 1 is partially a result of the di¡erent detector designs. All data, except those of [18,19,22,23], were collected with BF 3 proportional counters embedded in para¤n using a lead core or cover; para¤n to shield the detectors from locally produced neutrons [13,24], lead as a target to produce secondary neutrons, from interactions with high-energy neutrons (200^1000 MeV [24]), that are recorded. A discussion of the in£uence of de-sign parameters on values for 1 is given in [13,25].…”

“…Teucher [28] comments on the possibility that locally produced secondary neutrons (i.e. those produced/re£ected at or below the air^surface interface [29]) are recorded as low energy events on the photographic emulsions and have an in£uence on the value of 1 obtained.…”

“…The neutron £ux at both sides of the interface shows a relatively £at pro¢le [29]. In all the photographic emulsion studies used here [18,22,23] the emulsions were exposed within 1 m of the air^surface interface. Thus a portion of the neutron tracks recorded by the emulsions is a consequence of the perturbed neutron £ux at the air^surface interface.…”