Table 3.
Natural abundances of calcium isotopes and their radioactive scandium reaction products after proton bombardment at 15.56 MeV.
| Target | % abundance | Nuclear reaction | t1/2 | Measured saturation yield (MBq/μA) | Predicted yield using corrected data in (Levkovskij, 1991) (MBq/μA) | % of predicted yield | % of yield measured in (Severin et al., 2012a) at 16 MeV |
|---|---|---|---|---|---|---|---|
| 40Ca | 96.941 | 40Ca(p,n)40Sca | 182 ms | – | |||
| 42Ca | 0.647 | 42Ca(p,n)42mSca | 61.7 s | – | |||
| 42Ca(p,n)42gScb | 681 ms | – | |||||
| 43Ca | 0.135 | 43Ca(p,n)43Scb | 3.89 h | 4.870.8 | 7.06 | 68% | 90% |
| 43Ca(p,2n)42Sca | 681 ms | – | |||||
| 44Ca | 2.086 | 44Ca(p,n)44gSc | 3.93 h | 179 ± 22 | 257 | 70% | 84% |
| 44Ca(p,n)44mSc | 58.6 h | 15.2 ± 2.0 | 20.0 | 76% | 88% | ||
| 44Ca(p,2n)43Scb | 3.89 h | ||||||
| 46Ca | 0.004 | 46Ca(p,n)46Sc | 83.8 h | Unobserved | |||
| 48Ca | 0.187 | 48Ca(p,n)48Sc | 43.7 h | 15.6 ± 2.4 | – | – | 75% |
| 48Ca(p,2n)47Sc | 80.4 h | 14.5 ± 2.5 | – | – | 129% |
a
These reactions are practically negligible because of the too short half-life of the produced Sc-isotope.
b
The 43Sc produced from 44Ca(p,2n), with an energy threshold of 14.5 MeV, is not distinguished from 43Ca(p,n) in this study.