by O. S. Kirsebom, M. Alcorta, M. J. G. Borge, M. Cubero, C. A. Diget, R. Dominguez-Reyes, L. Fraile, B. R. Fulton, H. O. U. Fynbo, D. Galaviz, G. Garcia, S. Hyldegaard, H. B. Jeppesen, B. Jonson, P. Joshi, M. Madurga, A. Maira, A. Muñoz, T. Nilsson, G. Nyman, D. Obradors, A. Perea, K. Riisager, O. Tengblad and M. Turrion
Abstract:
The reactions B10(He3,pααα) at 4.9 MeV and B11(He3,dααα) 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.
Reference:
O. S. Kirsebom, M. Alcorta, M. J. G. Borge, M. Cubero, C. A. Diget, R. Dominguez-Reyes, L. Fraile, B. R. Fulton, H. O. U. Fynbo, D. Galaviz, G. Garcia, S. Hyldegaard, H. B. Jeppesen, B. Jonson, P. Joshi, M. Madurga, A. Maira, A. Muñoz, T. Nilsson, G. Nyman, D. Obradors, A. Perea, K. Riisager, O. Tengblad and M. Turrion, “Observation of γ-delayed 3α breakup of the 15.11 and 12.71 MeV states in 12C”, Physics Letters B, vol. 680, no. 1, pp. 44–49.
Bibtex Entry:
@article{kirsebom_observation_2009,
title = {Observation of γ-delayed 3α breakup of the 15.11 and 12.71 {MeV} states in {12C}},
volume = {680},
issn = {0370-2693},
url = {http://www.sciencedirect.com/science/article/pii/S0370269309009836},
doi = {10.1016/j.physletb.2009.08.034},
abstract = {The reactions B10(He3,pααα) at 4.9 MeV and B11(He3,dααα) 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.},
number = {1},
urldate = {2017-10-06},
journal = {Physics Letters B},
author = {Kirsebom, O. S. and Alcorta, M. and Borge, M. J. G. and Cubero, M. and Diget, C. A. and Dominguez-Reyes, R. and Fraile, L. and Fulton, B. R. and Fynbo, H. O. U. and Galaviz, D. and Garcia, G. and Hyldegaard, S. and Jeppesen, H. B. and Jonson, B. and Joshi, P. and Madurga, M. and Maira, A. and Muñoz, A. and Nilsson, T. and Nyman, G. and Obradors, D. and Perea, A. and Riisager, K. and Tengblad, O. and Turrion, M.},
month = sep,
year = {2009},
keywords = {Complete kinematics, Deduced transition, Unbound state},
pages = {44--49},
file = {ScienceDirect Full Text PDF:E:\cmam_papers\files\998\Kirsebom et al. - 2009 - Observation of γ-delayed 3α breakup of the 15.11 a.pdf:application/pdf;ScienceDirect Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\TGZ4APZN\Kirsebom et al. - 2009 - Observation of γ-delayed 3α breakup of the 15.11 a.pdf:application/pdf;ScienceDirect Snapshot:E:\cmam_papers\files\993\S0370269309009836.html:text/html;ScienceDirect Snapshot:E:\Usuarios\Administrator\Zotero\storage\IFK8AS68\S0370269309009836.html:text/html},
}