Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12

O. S. Kirsebom; M. Alcorta; M. J. G. Borge; M. Cubero; Christian Aaen 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. Munoz; T. Nilsson; G. Nyman; D. Obradors; A. Perea; K. Riisager; O. Tengblad; M. Turrion

doi:10.1016/j.physletb.2009.08.034

Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12

O. S. Kirsebom, M. Alcorta, M. J. G. Borge, M. Cubero, Christian Aaen 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. Munoz, T. Nilsson, G. NymanD. Obradors, A. Perea, K. Riisager, O. Tengblad, M. Turrion

Physics

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Abstract

The reactions B-10(He-3, p alpha alpha alpha) at 4.9 MeV and B-11(He-3, d alpha alpha alpha) at 8.5 MeV have been used to investigate the gamma decay of states in C-12. By measuring the four-body final state in complete kinematics we are able to detect gamma transitions indirectly. We find gamma transitions from the 15.11 MeV state in C-12 to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three alpha particles. The relative gamma-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 gamma decays going to the bound states. We obtain Gamma(alpha)/Gamma = (2.8 +/- 1.2)% for the isospinforbidden alpha decay of the 15.11 MeV state. From the 12.71 MeV state we find gamma transitions to the 10.3 and 7.65 MeV states. The relative gamma-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 gamma decays going to the bound states. Finally. we discuss the relation between the beta decay of N-12 and B-12 to states in C-12 and the gamma decay of the 15.11 MeV analog in C-12 to the same states. (C) 2009 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	44-49
Number of pages	6
Journal	Physics Letters B
Volume	680
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2009.08.034
Publication status	Published - 14 Sept 2009

Keywords

Complete kinematics
Unbound state
Deduced gamma transition
ELECTRON-SCATTERING
LIGHT-NUCLEI
TRANSITIONS
DECAY

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10.1016/j.physletb.2009.08.034

http://www.sciencedirect.com/science/article/pii/S0370269309009836

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Kirsebom, O. S., Alcorta, M., Borge, M. J. G., Cubero, M., Diget, C. A., Dominguez-Reyes, R., Fraile, L., Fulton, B. R., Fynbo, H. O. U., Galaviz, D., Garcia, G., Hyldegaard, S., Jeppesen, H. B., Jonson, B., Joshi, P., Madurga, M., Maira, A., Munoz, A., Nilsson, T., ... Turrion, M. (2009). Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12. Physics Letters B, 680(1), 44-49. https://doi.org/10.1016/j.physletb.2009.08.034

@article{5b4d6baa0b49457694be6594ead80834,

title = "Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12",

abstract = "The reactions B-10(He-3, p alpha alpha alpha) at 4.9 MeV and B-11(He-3, d alpha alpha alpha) at 8.5 MeV have been used to investigate the gamma decay of states in C-12. By measuring the four-body final state in complete kinematics we are able to detect gamma transitions indirectly. We find gamma transitions from the 15.11 MeV state in C-12 to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three alpha particles. The relative gamma-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 gamma decays going to the bound states. We obtain Gamma(alpha)/Gamma = (2.8 +/- 1.2)% for the isospinforbidden alpha decay of the 15.11 MeV state. From the 12.71 MeV state we find gamma transitions to the 10.3 and 7.65 MeV states. The relative gamma-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 gamma decays going to the bound states. Finally. we discuss the relation between the beta decay of N-12 and B-12 to states in C-12 and the gamma decay of the 15.11 MeV analog in C-12 to the same states. (C) 2009 Elsevier B.V. All rights reserved.",

keywords = "Complete kinematics, Unbound state, Deduced gamma transition, ELECTRON-SCATTERING, LIGHT-NUCLEI, TRANSITIONS, DECAY",

author = "Kirsebom, {O. S.} and M. Alcorta and Borge, {M. J. G.} and M. Cubero and Diget, {Christian Aaen} and R. Dominguez-Reyes and L. Fraile and Fulton, {B. R.} and Fynbo, {H. O. U.} and D. Galaviz and G. Garcia and S. Hyldegaard and Jeppesen, {H. B.} and B. Jonson and P. Joshi and M. Madurga and A. Maira and A. Munoz and T. Nilsson and G. Nyman and D. Obradors and A. Perea and K. Riisager and O. Tengblad and M. Turrion",

year = "2009",

month = sep,

day = "14",

doi = "10.1016/j.physletb.2009.08.034",

language = "English",

volume = "680",

pages = "44--49",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1",

}

Kirsebom, OS, Alcorta, M, Borge, MJG, Cubero, M, Diget, CA, Dominguez-Reyes, R, Fraile, L, Fulton, BR, Fynbo, HOU, Galaviz, D, Garcia, G, Hyldegaard, S, Jeppesen, HB, Jonson, B, Joshi, P, Madurga, M, Maira, A, Munoz, A, Nilsson, T, Nyman, G, Obradors, D, Perea, A, Riisager, K, Tengblad, O & Turrion, M 2009, 'Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12', Physics Letters B, vol. 680, no. 1, pp. 44-49. https://doi.org/10.1016/j.physletb.2009.08.034

TY - JOUR

T1 - Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12

AU - Kirsebom, O. S.

AU - Alcorta, M.

AU - Borge, M. J. G.

AU - Cubero, M.

AU - Diget, Christian Aaen

AU - Dominguez-Reyes, R.

AU - Fraile, L.

AU - Fulton, B. R.

AU - Fynbo, H. O. U.

AU - Galaviz, D.

AU - Garcia, G.

AU - Hyldegaard, S.

AU - Jeppesen, H. B.

AU - Jonson, B.

AU - Joshi, P.

AU - Madurga, M.

AU - Maira, A.

AU - Munoz, A.

AU - Nilsson, T.

AU - Nyman, G.

AU - Obradors, D.

AU - Perea, A.

AU - Riisager, K.

AU - Tengblad, O.

AU - Turrion, M.

PY - 2009/9/14

Y1 - 2009/9/14

N2 - The reactions B-10(He-3, p alpha alpha alpha) at 4.9 MeV and B-11(He-3, d alpha alpha alpha) at 8.5 MeV have been used to investigate the gamma decay of states in C-12. By measuring the four-body final state in complete kinematics we are able to detect gamma transitions indirectly. We find gamma transitions from the 15.11 MeV state in C-12 to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three alpha particles. The relative gamma-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 gamma decays going to the bound states. We obtain Gamma(alpha)/Gamma = (2.8 +/- 1.2)% for the isospinforbidden alpha decay of the 15.11 MeV state. From the 12.71 MeV state we find gamma transitions to the 10.3 and 7.65 MeV states. The relative gamma-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 gamma decays going to the bound states. Finally. we discuss the relation between the beta decay of N-12 and B-12 to states in C-12 and the gamma decay of the 15.11 MeV analog in C-12 to the same states. (C) 2009 Elsevier B.V. All rights reserved.

AB - The reactions B-10(He-3, p alpha alpha alpha) at 4.9 MeV and B-11(He-3, d alpha alpha alpha) at 8.5 MeV have been used to investigate the gamma decay of states in C-12. By measuring the four-body final state in complete kinematics we are able to detect gamma transitions indirectly. We find gamma transitions from the 15.11 MeV state in C-12 to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three alpha particles. The relative gamma-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 gamma decays going to the bound states. We obtain Gamma(alpha)/Gamma = (2.8 +/- 1.2)% for the isospinforbidden alpha decay of the 15.11 MeV state. From the 12.71 MeV state we find gamma transitions to the 10.3 and 7.65 MeV states. The relative gamma-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 gamma decays going to the bound states. Finally. we discuss the relation between the beta decay of N-12 and B-12 to states in C-12 and the gamma decay of the 15.11 MeV analog in C-12 to the same states. (C) 2009 Elsevier B.V. All rights reserved.

KW - Complete kinematics

KW - Unbound state

KW - Deduced gamma transition

KW - ELECTRON-SCATTERING

KW - LIGHT-NUCLEI

KW - TRANSITIONS

KW - DECAY

UR - http://www.scopus.com/inward/record.url?scp=69349094475&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2009.08.034

DO - 10.1016/j.physletb.2009.08.034

M3 - Article

SN - 0370-2693

VL - 680

SP - 44

EP - 49

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -

Observation of gamma-delayed 3 alpha breakup of the 15.11 and 12.71 MeV states in C-12

Abstract

Keywords

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