| Precise branching ratios to unbound 12C states from 12N and 12B beta-decays (2009) | |||||||||
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Abstract | |||||||||
| Two complementary experimental techniques have been used to extract precise branching ratios to unbound states in 12C from 12N and 12B β-decays. In the first the three α-particles emitted after β-decay are measured in coincidence in separate detectors, while in the second method 12N and 12B are implanted in a detector and the summed energy of the three α-particles is measured directly. For the narrow states at 7.654 MeV (0+) and 12.71 MeV (1+) the resulting branching ratios are both smaller than previous measurements by a factor of ~2. The experimental results are compared to no-core shell model calculations with realistic interactions from chiral perturbation theory, and inclusion of three-nucleon forces is found to give improved agreement.. Academy of Finland (No. project 44875). Spanish Agency CICYT (No. FPA2005-02379). MEC Consolider project CSD2007-00042. Belgian IAP P6/23 project. FWO-Vlaanderen. European Union sixth Framework Programme “EURONS” (No. 506065). Swedish Research Council. Knut and Alice Wallenberg foundation. LLNL (Contract DE-AC52-07NA27344 and DE-FC02-07ER41457). DE-FG02-87ER40371. program 48 (TRIμP) of the ‘Stichting voor Fundamenteel Onderzoek der Materie’ (FOM). Swedish National Infrastructure for Computing (SNIC007-07-56). Oak Ridge Natinal Laboratory Jaguar facility under the auspices of a DOE-INCITE award (David Dean, PI) | |||||||||
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