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Título: | Observation of γ-delayed 3α breakup of the 15.11 and 12.71 MeV states in 12C |
Autor: | Kirsebom, O.S.; Alcorta, Martín CSIC ORCID; García Borge, María José CSIC ORCID; Cubero, M. CSIC ORCID; Diget, C.A.; Domínguez-Reyes, Ricardo CSIC; Fraile, Luis M. ; Fulton, B.R.; Fynbo, H.O.U.; Galaviz, D. CSIC ORCID; García, Gustavo CSIC ORCID; Hyldegaard, S.; Jeppesen, H.B.; Jonson, B.; Joshi, P.; Madurga, Miguel CSIC; Maira-Vidal, A. CSIC; Muñoz, A. CSIC; Nilsson, T.; Nyman, G.; Obradors, Diego CSIC; Perea, Ángel CSIC ORCID; Riisager, K.; Tengblad, Olof CSIC ORCID ; Turrión, Manuela CSIC ORCID | Palabras clave: | Complete kinematics Unbound state Deduced γ ransition |
Fecha de publicación: | 19-ago-2009 | Editor: | Elsevier BV | Citación: | Physics Letters B 680: 44-49 (2009) | Resumen: | The reactions 10B (3He, p α α α) at 4.9 MeV and 11B (3He, d α α α) at 8.5 MeV have been used to investigate the γ decay of states in 12C. By measuring the four-body final state in complete kinematics we are able to detect γ transitions indirectly. We find γ transitions from the 15.11 MeV state in 12C to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three α particles. The relative γ-ray branching ratios obtained are (1.2 ± 0.3), (0.32 ± 0.12), (1.4 ± 0.2) and (4.4 ± 0.8) %, respectively, with the remaining (92.7 ± 1.0) % of the γ decays going to the bound states. We obtain Γα / Γ = (2.8 ± 1.2) % for the isospin-forbidden α decay of the 15.11 MeV state. From the 12.71 MeV state we find γ transitions to the 10.3 and 7.65 MeV states. The relative γ-ray branching ratios are (0.9- 0.5 + 0.6) and (2.6- 1.2 + 1.6) %, respectively, with the remaining (96.6- 1.3 + 1.7) % of the γ decays going to the bound states. Finally, we discuss the relation between the β decay of 12N and 12B to states in 12C and the γ decay of the 15.11 MeV analog in 12C to the same states. © 2009 Elsevier B.V. | Descripción: | 6 pags., 4 figs., 2 tabs. -- PACS:27.20.+n25.55.Hp23.20.-g29.85.-c | Versión del editor: | http://dx.doi.org/10.1016/j.physletb.2009.08.034 | URI: | http://hdl.handle.net/10261/246741 | DOI: | 10.1016/j.physletb.2009.08.034 | Identificadores: | doi: 10.1016/j.physletb.2009.08.034 issn: 0370-2693 |
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