Author/Authors :
U.C. Bergmann، نويسنده , , M.J.G. Borge، نويسنده , , R. Boutami، نويسنده , , L.M. Fraile، نويسنده , , H.O.U. Fynbo، نويسنده , , P. Hornsh?j، نويسنده , , B. Jonson، نويسنده , , K. Markenroth، نويسنده , , I. Martel، نويسنده , , I. Mukha، نويسنده , , T. Nilsson، نويسنده , , G. Nyman، نويسنده , , A. Oberstedt، نويسنده , , Y. Prezado Alonso، نويسنده , , K. Riisager، نويسنده , , H. Simon، نويسنده , , O. Tengblad، نويسنده , , F. Wenander، نويسنده , , K. Wilhelmsen Rolander، نويسنده , , ISOLDE Collaboration ، نويسنده , , et al.، نويسنده ,
Abstract :
In β-decay experiments on 9C 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 9B. A large β-strength asymmetry is deduced for the mirror transitions of 9C and 9Li 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 5Li and 8Be. 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.
Keywords :
decay mechanism features , Ca(p , X)] , measured ?-delayed View the MathML source , A=9?-decay asymmetry. Double-sided silicon strip detectors , View the MathML source , mass-separated source , p??-coin. , angular correlations. 9B deduced ?-branching strengths
