Mathematics – Logic
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvc..63c4303b&link_type=abstract
Physical Review C, vol. 63, Issue 3, id. 034303
Mathematics
Logic
15
Relation With Nuclear Matrix Elements And Nuclear Structure, 6<=A<=19
Scientific paper
The decay of 9C (T1/2=126.5 ms) has been observed in two experiments at the TISOL facility at TRIUMF employing different detector configurations for each run. In the first of two papers [E. Gete et al., Phys. Rev. C 61, 064310 (2000)], the experimental technique and data analysis were described. Phenomenological branching ratios and Gamow-Teller strengths were then deduced. In this paper, the data are analyzed using a multichannel, multistate R-matrix approach which leads to a different interpretation of the spectra and therefore modified state energies, widths, branching ratios, and Gamow-Teller strengths. Difficulties in fitting the second excited state of 9B at 2.34 MeV and possible modifications to the penetrability are described. The existence of a Jπ=1/2- state at about 5 MeV excitation energy is suggested from the fits, as well as a considerable decay strength from the 9B ground state at high energies. Consequences for the properties of the A=9, T=1/2 nuclear system are then discussed; in particular, it is shown that the data agree qualitatively with shell model predictions without unusual Gamow-Teller strength present at high excitation energies. Finally, an estimate of the 4He(αn,γ)9Be stellar reaction rate is given.
Buchmann Lothar
Chow Judith C.
Gete E.
King J. D.
Measday D. F.
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