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Título : Precise branching ratios to unbound 12C states from 12N and 12B β-decays
Autor : Hyldegaard, S., Forssén, C., Diget, C.Aa., Alcorta, Martín, Barker, F. C., Bastin, B., García Borge, María José, Boutami, Rafik, Brandenburg, S., Büscher, J., Dendooven, P., Van Duppen, P., Eronen, T., Fox, S., Fulton, B. R., Fynbo, H. O. U., Huikari, J., Huyse, M., Jeppesen, Henrik B., Jokinen, A., Jonson, B., Jungmann, K., Kankainen, A., Kirsebom, O., Madurga, Miguel, Moore, I., Navrátil, P., Nilsson, T., Nyman, G., Onderwater, G. J. G., Penttilä, H., Peräjärvi, K., Raabe, R., Riisager, K., Rinta-Antila, S., Rogachevskiy, A., Saastamoinen, A., Sohani, M., Tengblad, Olof, Traykov, E., Vary, J. P., Wang, Y., Wilhelmsen, K., Wilschut, H. W., Äystö, J.
Palabras clave : [PACS] Few-body systems
[PACS] β decay; double β decay; electron and muon capture
[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
[PACS] Ab initio methods
Fecha de publicación : 4-Jul-2009
Editor: Elsevier
Resumen: 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.
Descripción : 6 pages, 2 tables, 4 figures.--PACS nrs.: 21.45.-v; 23.40.-s; 27.20.+n; 21.60.De.--Printed version published Aug 3, 2009
Versión del editor:
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2009.06.064
Citación : Physics Letters B 678(5): 459–464 (2009)
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