Spectroscopy of 9B via high-resolution ejectile-tagged recoil break-up

C. Wheldon*, Tzanka Kokalova Wheldon, M. Freer, J. Walshe, R. Hertenberger, H. F. Wirth, N. I. Ashwood, M. Barr, N. Curtis, Th Faestermann, R. Lutter, J. D. Malcolm, D. J. Marín-Lámbarri

*Corresponding author for this work

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3 Citations (Scopus)
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Abstract

An experiment has been carried out using the 9Be(3He, t) 9B reaction at a beam energy of 33 MeV. A large acceptance silicon-strip array was used to detect the 9B break-up in coincidence with the triton ejectiles in the high-resolution Munich-Q3D spectrograph. The excitation energy regime <3 MeV has been explored and the spectrum resulting from proton decaying states, isolated and characterized. Additional resonance strength is observed at 1.86 MeV ±70 keV(stat) ±35 keV(syst), in agreement with two other recent measurements at higher energies and different angles. The consequences for the “missing” ½+ first excited state are discussed. Additionally, the branching ratios for the 2.36 MeV 5/2 state have been measured as Γα0/Γ = 0.98 ± 0.12 and Γp0/Γ = 0.016 ± 0.008, in close agreement with earlier work.
Original languageEnglish
Article number024308
Number of pages6
JournalPhysical Review C
Volume91
Issue number2
DOIs
Publication statusPublished - 11 Feb 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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