Properties of the 12C 10 MeV state determined through β-decay

The β-delayed triple- α particle decay of 12B has been measured with a setup that favours coincidence detection. A broad state in 12C, previously reported around 10 MeV, has been seen and its properties determined through R-matrix analysis of the excitation spectrum. The spin and parity are 0 + . In...

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Bibliographic Details
Published in:Nuclear physics. A 2005-10, Vol.760 (1), p.3-18
Main Authors: Diget, C.Aa, Barker, F.C., Borge, M.J.G., Cederkäll, J., Fedosseev, V.N., Fraile, L.M., Fulton, B.R., Fynbo, H.O.U., Jeppesen, H.B., Jonson, B., Köster, U., Meister, M., Nilsson, T., Nyman, G., Prezado, Y., Riisager, K., Rinta-Antila, S., Tengblad, O., Turrion, M., Wilhelmsen, K., Äystö, J.
Format: Article
Language:English
Subjects:
12Be( [formula omitted]) 12B( [formula omitted]) [produced in Ta( [formula omitted])]
deduced
double-sided Si strip detector
measured
R-matrix analysis
Radioactivity
spin and parity of levels in 12C
α-particle coincidences
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Summary:The β-delayed triple- α particle decay of 12B has been measured with a setup that favours coincidence detection. A broad state in 12C, previously reported around 10 MeV, has been seen and its properties determined through R-matrix analysis of the excitation spectrum. The spin and parity are 0 + . Interference between this state and the Hoyle state at 7.654 MeV has a marked influence on the spectrum. The coupling between the two states makes it difficult to determine the resonance energy.
ISSN:0375-9474
DOI:10.1016/j.nuclphysa.2005.05.159