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Closed Access item On the β-decay of C-9

Authors:Bergmann, U. C.
García Borge, María José
Boutami, Rafik
Fraile, Luis M.
Fynbo, H. O. U.
Hornshøj, P.
Jonson, B.
Markenroth, K.
Martel, Ismael
Mukha, I.
Nilsson, T.
Nyman, G.
Oberstedt, A.
Prezado Alonso, Yolanda
Riisager, K.
Simon, H.
Tengblad, Olof
Wenander, F.
Wilhelmsen Rolander, K.
Keywords:Radioactivity C-9(β(+)) [from O,Ca(p,X)], Measured β-delayed E-p, E-α, pαα-coin, Angular correlations, B-9 deduced β-branching strengths, Decay mechanism features, A=9 β-decay asymmetry, Double-sided silicon strip detectors, Mass-separated source, Delayed proton, Nuclear system, Light-nuclei, Shell-Model, Drip-line, Emission, Asymmetry, Continuum, States, Li-9
Issue Date:24-Sep-2001
Series/Report no.:Nuclear Physics A 692(3-4): 427–450 (2001)
Abstract:In β-decay experiments on C-9 at CERN/ISOLDE the β-strength was determined to the ground state, the 12.2 MeV excited state and the Isobaric Analog State (IAS) at 14.655 MeV in B-9. A large β-strength asymmetry is deduced for the mirror transitions of C-9 and Li-9 to states around 12 MeV excitation energy. A satisfactory description of the three-body decay from a narrow energy region around the 12.2 MeV resonance is obtained within a sequential model involving the ground and first-excited states of Li-5 and Be-8. From the study of angular correlations the spin of the 12.2 MeV state is determined as 5/2(-). For the first time the population of the IAS is observed in β-decay and new information on the decay of this state is obtained. The advantages of a closely packed. highly segmented detector setup are demonstrated.
Description:24 pages, 9 figures.-- PACS nrs.: 23.40.Hc; 27.20.+n; 24.80.+y.-- Available online 17 August 2001.
Publisher version (URL):http://dx.doi.org/10.1016/S0375-9474(01)00650-9
Appears in Collections:(CFMAC-IEM) Artículos

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