Computer Science
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt........37g&link_type=abstract
Thesis (PhD). THE UNIVERSITY OF BRITISH COLUMBIA (CANADA), Source DAI-B 61/05, p. 2602, Nov 2000, 181 pages.
Computer Science
1
Scientific paper
The β-decay of 9C (tl/2 = 126.5 ms) to the particle-unstable nucleus 9B has been studied at the TISOL facility at TRIUMF with an intent to measure the β-decay scheme and to study the structure of 9B. All of the states in 9B populated by the β+ decay of 9C are unbound and decay ultimately into 2α + p. It is therefore necessary to measure the decay particles in coincidence in order to measure the excitation energy of 9B. Two coincidence experiments with different detector geometries were performed. In the first experiment. four ΔE-E particle telescopes arranged in face-to-face pairs measured singles and double coincidence particle spectra. For the second experiment a pair of position sensitive Double-Sided Silicon Strip Detectors were used in conjunction with particle telescopes to record three-fold coincidence events. The coincidence measurements allowed us to kinematically identify events from 5Li + α and 8Be + p, the two major decay modes of the states of 9B. Several states in 9B have been observed and β- branching ratios to these states. and a and proton decay branches from these states have been measured. Because most of the 9B levels are broad, the state shapes fed by the β decay of 9C are distorted by the β-decay phase-space factor. In order to describe the states of 9B and the secondary compound states such as 5Li into which the 9B states decay. a simplified one-level R- matrix description of these states was used, and the spectra from both decay modes were fitted. β-decay branching ratios as well as Gamow-Teller strengths for the observed states of 9B were extracted from these fits. Four strongly populated states of 9B have been observed; the ground state (47 +/- 5) % and excited states at 2.34 (35 +/- 7) %, 2.8 (6.7 +/- 0.7) % and 12.16 (6.8 +/- 0.7) % MeV. The strong branch to the 12.16 MeV state corresponds to a large Gamow-Teller matrix element with BGT = 2.5 +/- 0.25.
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