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Halo neutrons and the β decay of Li 11

2004; American Institute of Physics; Volume: 70; Issue: 3 Linguagem: Inglês

10.1103/physrevc.70.031302

1538-4497

F. Sarazin, Jim Al-Khalili, G. C. Ball, G. Hackman, P. M. Walker, R. A. E. Austin, B. Eshpeter, P. Finlay, P. E. Garrett, G. F. Grinyer, K. A. Koopmans, W. D. Kulp, J. R. Leslie, D. Melconian, C. J. Osborne, M. A. Schumaker, H. C. Scraggs, J. von Schwarzenberg, M. B. Smith, C. E. Svensson, J. C. Waddington, John L. Wood,

Nuclear Physics and Applications

The $\ensuremath{\beta}$ decay of $^{11}\mathrm{Li}$ has been investigated at TRIUMF-ISAC using a high-efficiency array of Compton suppressed $\mathrm{HPGe}$ detectors. From a line-shape analysis of the Doppler-broadened peaks observed in the $^{10}\mathrm{Be}$ $\ensuremath{\gamma}$ spectrum, both the half-lives of states in $^{10}\mathrm{Be}$ and the energies of the $\ensuremath{\beta}$-delayed neutrons feeding those states were obtained. Furthermore, it was possible to determine the excitation energies of the parent states in $^{11}\mathrm{B}\mathrm{e}$ with uncertainties comparable to those obtained from neutron spectroscopy experiments. These data suggest that the $\ensuremath{\beta}$ decay to the $8.81\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ state in $^{11}\mathrm{Be}$ occurs in the $^{9}\mathrm{Li}$ core and that one neutron comprising the halo of $^{11}\mathrm{Li}$ survives in a halolike configuration after the $\ensuremath{\beta}$-delayed neutron emission from this level.