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--- group_5 [2018/09/13 16:27]
flowerdew
+++ group_5 [2018/09/14 09:13] (current)
surbrook
@@ Line 16: / Line 16: @@
   * Used website to calculate θ<sub>max</sub> and ΔE/E
-    ** Opening angle = 10 mrad which is less than the θ<sub>max</sub>=25 mrad so we're good. \\
+    ** Opening angle = 0.59 deg = 10 mrad which is less than the θ<sub>max</sub>=25 mrad so we're good. \\
-    ** ΔE/E = ~2% which is less than the 3.1% threshold so this also works.\\
+    ** ΔE/E = (12.083-11.593)/(12.083+11.593) ~2% which is less than the 3.1% threshold so this also works.\\
+{{:eandangle15oalpha.png?400|}}
 Question 5:
-  * <sup>15</sup>O + α reaction plays a role in the ignition of type I x-ray bursts on accreting neutron stars \\
+  * Proton capture on <sup>15</sup>O one might expect from rp-process conditions is halted by the short half-life of <sup>16</sup>F (40 keV) and its proton emission back to <sup>15</sup>O. The two minute half-life of <sup>15</sup>O further acts to limit transitions out of <sup>15</sup>O, making <sup>15</sup>O a waiting point in nucleosynthesis in this mass region. \\
+  * <sup>15</sup>O + α reaction plays a role in bypassing this waiting point in the ignition of type I x-ray bursts on accreting neutron stars, but the cross-section at relevant temperatures/energies has been experimentally inaccessible to date. The next generation recoil separators, St. George at Notre Dame and SECAR at NSCL/FRIB may reach sensitivity to this important reaction. \\

JINA-CEE ION OPTICS SUMMER SCHOOL: JIOSS 2018

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