Physics – Nuclear Physics
Scientific paper
Nov 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972nupha.195..311a&link_type=abstract
Nuclear Physics A, Volume 195, Issue 1, p. 311-320.
Physics
Nuclear Physics
5
Nuclear Reactions
Scientific paper
Radiochemical measurements of the activities of 10Be and 7Be in oxygen due to the bombardment of water samples by protons of energies 135 and 550 MeV are reported. The ratios σ(10Be)/σ(7Be) of the cross sections in oxygen are found to be 0.19 +/- 0.01 and 0.32 +/- 0.02 for 135 and 550 MeV protons, respectively, based on t1/2(10Be) = 2.7 × 106 y and t1/2(7Be) = 53.6 d. Using the best estimate of the excitation function of 7Be in oxygen, the formation cross sections for 10Bein oxygen are estimated to be 1.0 +/- 0.06 and 2.9 +/- 0.2 mb for protons of energies 135 and 550 MeV respectively. Cross sections for 10Be in oxygen, averaged over the energy spectrum of cosmic rays, and based on the observations of its activity in meteorites and deep-sea sediments are discussed. The implication of the present measurements for the use of the 10Be isotope as a ``clock'' to estimate the ``age'' of cosmic rays is briefly noted.
Amin B. S.
Biswas Santidan
Lal Devendra
Somayajulu Bhamdipati L. K.
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