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  • Kirsebom, O. S.Århus Universitet,Aarhus University (author)

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

  • Article/chapterEnglish2009

Publisher, publication year, extent ...

  • Elsevier BV,2009

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  • LIBRIS-ID:oai:research.chalmers.se:573b24fb-67f7-4a4f-be64-21af46e7062c
  • https://research.chalmers.se/publication/103395URI
  • https://doi.org/10.1016/j.physletb.2009.08.034DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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.

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  • Alcorta, M.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Borge, M. J. G.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Cubero, M.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Diget, C. A.University of York (author)
  • Dominguez-Reyes, R.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Fraile, L.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Fulton, B. R.University of York (author)
  • Fynbo, H. O. U.Århus Universitet,Aarhus University (author)
  • Galaviz, D.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Garcia, G.Universidad Autonoma de Madrid (UAM) (author)
  • Hyldegaard, S.Århus Universitet,Aarhus University (author)
  • Jeppesen, H. B.Århus Universitet,Aarhus University (author)
  • Jonson, Björn,1941Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bjn (author)
  • Joshi, P.University of York (author)
  • Madurga, M.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Maria, A.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Munoz, A.Universidad Autonoma de Madrid (UAM) (author)
  • Nilsson, Thomas,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tnilsson (author)
  • Nyman, Göran Hugo,1943Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)f2bgn (author)
  • Obradors, D.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Perea, A.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Riisager, K.Århus Universitet,Aarhus University (author)
  • Tengblad, Olof,1957CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Turrion, M.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Århus UniversitetCSIC - Instituto de Estructura de la Materia (IEM) (creator_code:org_t)

Related titles

  • In:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics: Elsevier BV680:1, s. 44-490370-2693

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