G

Cosmic radioactivities

“…(4) An amount of 205 Pb that exceeds largely the experimental upper limit set by [57], but which is quite compatible with the value reported by [28], is obtained not only for the model star displayed in Fig. 1, but also for the other cases considered by [16]. This high production appears in fact to be a distinctive prediction concerning WR stars, and a renewed search for its in situ decay in meteorites would be most valuable (Sect.…”

“…4). A detailed discussion of its production by the MgAl chain of hydrogen burning has been conducted recently by [16] and [75]. Let us simply note here that the canonical value ( 26 Al/ 27 Al) 0 = 5 × 10 −5 [71], while not reached in the 60 M ⊙ star displayed in Fig.…”

“…The production of short-lived radionuclides of cosmochemical interest by a large variety of WR stars has been calculated in the framework of detailed evolution models, and with the use of extended nuclear reaction networks [16]. As the modelling of these stars is immensely simpler than the one of all the other short-lived radionuclide producers proposed up to now, the predicted WR yields are thus likely to reach a level of reliability that cannot be obtained in the other cases.…”

“…As the modelling of these stars is immensely simpler than the one of all the other short-lived radionuclide producers proposed up to now, the predicted WR yields are thus likely to reach a level of reliability that cannot be obtained in the other cases. In short, the main results obtained by [16] are as follows:…”

“…Other available experimental data (labelled Exp) are displayed. They are adopted from [71] for Al, [104] for Ca (see also [97]), [81] for Cl, and [57] for Pb [see also [28], who propose the somewhat larger value ( 205 Pb/ 204 Pb)0 ≈ 3 × 10 −4 (not shown)] (see [16] for more details)…”