Contribution to the study of 12C excited levels resulting from the reactions 11B (P/ α0) and 11B (p, α1)
Creators
- 1. Commissariat a l'Energie Atomique, Grenoble (France). Centre d'Etudes Nucleaires
Description
This work is made up of two parts. In the first part the differential cross-sections have been determined of the reactions 11B (p,α) from 130 to 500 keV thus confirming, at the 163 keV resonance, the (2+) characteristics of the 16.11 MeV level of 12C. Furthermore, the experimental results in the neighbourhood of the 163 keV resonance can be explained by the interference of the 12C levels: 2+ at 16.11 MeV and 1- at 17.23 MeV for the α0, 2+ at 16.11 MeV and 2- at 16.58 MeV for the α1. In the second part the (α-8Be) disintegration process of 12C has been studied in the neighbourhood of the 16.11 MeV level. It is shown that, if the (α-8Be) mode of disintegration is preponderant outside the Ep = 163 keV resonance, it is also preponderant at this same resonance; a direct disintegration of the 12C to 3 α, with an approximate magnitude of 40 per cent has however not been excluded. (author)
Availability note (English)
Available from INIS in electronic formAbstract (French)
Ce travail comprend deux parties: Dans la premiere, on a determine la section efficace differentielle des reactions 11B (p,α) de 130 a 500 keV, confirmant, a la resonance de 163 keV, les caracteristiques (2+) du niveau de 16,11 MeV du 12C. En outre, les resultats experimentaux au voisinage de la resonance de 163 keV sont explicables par l'interference des niveaux du 12C: 2+ a 16,11 MeV et 1- a 17,23 MeV pour les α0, 2+ a 16,11 MeV et 2- a 16,58 MeV pour les α1. Dans la deuxieme partie, on a etudie le mode de desintegration (α-8Be) du 12C au voisinage du niveau de 16,11 MeV. On a montre que, si le mode de desintegration (α-8Be) est preponderant en dehors de la resonance Ep = 163 keV, il est egalement preponderant a cette resonance; une desintegration directe en 3α du 12C, dont l'ordre de grandeur maximum serait de 40 pour cent, n'a cependant pas pu etre exclue. (auteur)Files
37064760.pdf
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Additional details
Additional titles
- Original title (French)
- Contribution a l'etude des niveaux excites du
Publishing Information
- Imprint Pagination
- 76 p.
- Report number
- CEA-R--2416
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 37064760
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- ALPHA DECAY; ANGULAR DISTRIBUTION; BORON 11 TARGET; CARBON 12; CLUSTER MODEL; COINCIDENCE SPECTROMETRY; DIFFERENTIAL CROSS SECTIONS; EXCITED STATES; ISOSPIN; JUNCTION DETECTORS; PROTON REACTIONS; RESONANCE
- Descriptors DEC
- BARYON REACTIONS; CARBON ISOTOPES; CHARGED-PARTICLE REACTIONS; COINCIDENCE METHODS; COUNTING TECHNIQUES; CROSS SECTIONS; DECAY; DISTRIBUTION; ENERGY LEVELS; EVEN-EVEN NUCLEI; HADRON REACTIONS; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; NUCLEAR DECAY; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; PARTICLE PROPERTIES; RADIATION DETECTORS; SEMICONDUCTOR DETECTORS; STABLE ISOTOPES; TARGETS
Optional Information
- Notes
- 28 refs.