Cook, Charles William (1957) Alpha-particles from boron 12: the astrophysical significance. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-07012004-103706
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Alpha particle emission associated with the [beta]-decay of B12 has been detected and the energy spectrum investigated. These studies show that 1.3 [plus or minus] 0.4 percent of all decays of B12 lead to the second excited state of C12 and 0.13 [plus or minus] 0.04 percent of the decays lead to what is most probably a broad state of higher excitation in C12. The most probable-spin and parity assignments for the second excited state appear to be [...], and analysis of the alpha-spectrum yields [...]kev, corresponding to an excitation energy in [...] Mev. A new determination of the disintegration energy of Be8 yields [...] kev and hence [...] kev. It is concluded from the general principle of reversibility of nuclear reactions, that the second excited state of C12 as predicted by Hoyle is of a suitable character to act as a stellar thermal resonance in the Salpeter process, [...]; [...] under conditions expected in red giant stars. The high-energy spectrum is consistent with a broad level peaking at an excitation energy 10.1 [plus or minus] 0.2 Mev in C12 and having a width at half maximum of [...]. The most probable spinand parity assignments for this level are [...] although [...] cannot definitely be excluded; for [...], the width is approximately the Wigner limit.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1957|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||02 Jul 2004|
|Last Modified:||26 Dec 2012 02:54|
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