Production of selected cosmogenic radionuclides by muons: 2. Capture of negative muons (original) (raw)
ADS
;
- Lal, D. ;
- Jull, A. J. T. ;
- Kubik, P. ;
- Ivy-Ochs, S. ;
- Knie, K. ;
- Nolte, E.
Abstract
We have determined the production yields for radionuclides in Al 2O 3, SiO 2, S, Ar, K 2SO 4, CaCO 3, Fe, Ni and Cu targets, which were irradiated with slow negative muons at the Paul Scherrer Institute in Villigen (Switzerland). The fluences of the stopped negative muons were determined by measuring the muonic X-rays. The concentrations of the long-lived and short-lived radionuclides were measured with accelerator mass spectrometry (AMS) and γ-spectroscopy, respectively. Special emphasis was put on the radionuclides 10Be, 14C and 26Al produced in quartz targets, 26Al in Al 2O 3 and S targets, 36Cl in K 2SO 4 and CaCO 3 targets, and 53Mn in Fe 2O 3 targets. These targets were selected because they are also the naturally occurring target minerals for cosmic ray interactions in typical rocks. We also present results of calculations for depth-dependent production rates of radionuclides produced after cosmic ray μ - capture, as well as cosmic ray-induced production rates of geologically relevant radionuclides produced by the nucleonic component, by μ - capture, by fast muons and by neutron capture.
Publication:
Earth and Planetary Science Letters
Pub Date:
June 2002
DOI:
Bibcode: