R-matrix analysis of the {beta} decays of {sup 12}N and {sup 12}B

Journal Article · Mon Feb 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.024303· OSTI ID:21386586

Hyldegaard, S; Fynbo, H O. U.; Jeppesen, H B; Kirsebom, O S; Riisager, K ^[1]; Alcorta, M; Borge, M J. G.; Boutami, R; Madurga, M; Tengblad, O ^[2]; Bastin, B; Buescher, J; Van Duppen, P; Huyse, M; Raabe, R ^[3]; Brandenburg, S; Dendooven, P; Jungmann, K; Onderwater, G J. G.; Rogachevskiy, A ^[4]

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1. Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)
2. Instituto de Estructura de la Materia, CSIC, E-28006 Madrid (Spain)
3. Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium)
4. Kernfysisch Versneller Instituut, University of Groningen, NL-9747 AA Groningen (Netherlands)

The {beta} decays of {sup 12}N and {sup 12}B have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0{sup +} and 2{sup +} strengths in the triple-{alpha} continuum. For the first time a complete treatment of 3{alpha} decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0{sup +} and 2{sup +} state is needed to reproduce the spectra. Broad 0{sub 3}{sup +} and 2{sub 2}{sup +} states are found between 10.5 and 12 MeV in this work. The presence of {beta} strength up to the {sup 12}N Q-value window suggests the presence of additional 0{sup +} and 2{sup +} components in the {sup 12}C structure at energies above 12.7 MeV.

• OSTI ID: 21386586
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON 12
BORON ISOTOPES
CARBON 12
CARBON ISOTOPES
CORRELATIONS
DECAY
ENERGY
ENERGY RANGE
EVEN-EVEN NUCLEI
ISOTOPES
KVI
LIGHT NUCLEI
MATRICES
MEV RANGE
MEV RANGE 10-100
MILLISECONDS LIVING RADIOISOTOPES
NATIONAL ORGANIZATIONS
NETHERLANDS ORGANIZATIONS
NITROGEN 12
NITROGEN ISOTOPES
NUCLEAR DECAY
NUCLEI
ODD-ODD NUCLEI
Q-VALUE
R MATRIX
RADIOISOTOPES
SPECTRA
STABLE ISOTOPES