TY - JOUR
T1 - In-situ production of radionuclides at great depths
AU - Heisinger, B.
AU - Niedermayer, M.
AU - Hartmann, F. J.
AU - Korschinek, G.
AU - Nolle, E.
AU - Morteani, G.
AU - Neumaier, S.
AU - Petitjean, C.
AU - Kubik, P.
AU - Synal, A.
AU - Ivy-Ochs, S.
PY - 1997/3
Y1 - 1997/3
N2 - The depth dependent in-situ production of radionuclides has been measured and calculated taking into account spallation reactions, reactions with captured negative and fast muons and background reactions. The following probabilities f* of particle emission channels after μ- capture have been measured: O(μ-,vμαpxn)10Be, x = 1-3, f* = (5.2 ± 0.6) × 10-3 and S(μ-, vμαxn)26Al, x = 2-4, 6, f* = (1.4 ± 0.4) × 10-3. From the oxygen irradiation result for 10Be and the known channel probability from silicon to 26Al, the production ratio of 26Al to 10Be after μ capture in quartz has been deduced to be P(26Al)/P(10Be) = 7.2 ± 1.2. The nucleon emission probabilities after μ- capture have been determined for iron. The particle emission channel Fe(μ-,vμxn)53Mn, x = 1, 3-5 was estimated to 0.05 ± 0.02. Natural depth profiles of 26Al in quartz have been measured in Northern Bavaria up to depths of 250 m and have been compared with calculated profiles taking erosion into account. From this comparison, the erosion rate in the last million years has been obtained to be about 10-20 μm/y.
AB - The depth dependent in-situ production of radionuclides has been measured and calculated taking into account spallation reactions, reactions with captured negative and fast muons and background reactions. The following probabilities f* of particle emission channels after μ- capture have been measured: O(μ-,vμαpxn)10Be, x = 1-3, f* = (5.2 ± 0.6) × 10-3 and S(μ-, vμαxn)26Al, x = 2-4, 6, f* = (1.4 ± 0.4) × 10-3. From the oxygen irradiation result for 10Be and the known channel probability from silicon to 26Al, the production ratio of 26Al to 10Be after μ capture in quartz has been deduced to be P(26Al)/P(10Be) = 7.2 ± 1.2. The nucleon emission probabilities after μ- capture have been determined for iron. The particle emission channel Fe(μ-,vμxn)53Mn, x = 1, 3-5 was estimated to 0.05 ± 0.02. Natural depth profiles of 26Al in quartz have been measured in Northern Bavaria up to depths of 250 m and have been compared with calculated profiles taking erosion into account. From this comparison, the erosion rate in the last million years has been obtained to be about 10-20 μm/y.
UR - http://www.scopus.com/inward/record.url?scp=0031546956&partnerID=8YFLogxK
U2 - 10.1016/S0168-583X(96)00702-1
DO - 10.1016/S0168-583X(96)00702-1
M3 - Article
AN - SCOPUS:0031546956
SN - 0168-583X
VL - 123
SP - 341
EP - 346
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-4
ER -