Abstract
The cross section of the11B(n, α)8Li reaction has been measured atE n=7.6 to 12.6 MeV. The neutron beam was produced via theD(d, n)3He reaction and aBF 3 counter (with naturalB isotopic composition) served both as target for the11B nuclides and as detector for the observation of the delayedα-activity of8Li. The data match well with previous results obtained atE n =12.5 to 20.0 MeV. Using the principle of detailed balance the data were converted to the case of the8Li(α, n 0)11B reaction. The associated astrophysicalS(E) factor is dominated by a resonance atE R=0.58 MeV of widthΓ R =200 keV, withS(E R )=8400 MeV b. ThisS (E R ) value for the n0 channel alone is already three times higher than the constantS(E) factor assumed previously and, thus, strengthens the significance of inhomogeneous Big Bang nucleosynthesis.
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Boesgaard, A.M., Steigman, G.: Ann. Rev. Astr. Ap.23, 319 (1985)
Applegate, J.H., Hogan, C.J., Scherrer, R.J.: Phys. Rev. D35, 1151 (1987); Astrophys. J.329, 592 (1988)
Alcock, C., Fuller, G.M., Mathews, G.J.: Astrophys. J.320, 439 (1987)
Malaney, R.A., Fowler, W.A.: The origin and distribution of the elements. Mathews, G.J. (ed.), p. 76. Singapore: World Scientific 1987
Malaney, R.A., Fowler, W.A.: Astrophys. J.333, 14 (1988);345, L5 (1989)
Malaney, R.A.: Primordial nuclosynthesis. Thompson, W.J., Carney, B.W. (eds.). Singapore: World Scientific, 1990 (in press)
Caughlan, G.R., Fowler, W.A.: At. Data Nucl. Data Tables40, 283 (1988)
Ajzenberg-Selove, F.: Nucl. Phys. A490, 1 (1988)
Madsen, J.: Phys. Rev. D (1990) (in press)
Thielemann, F.K., Wiescher, M.: Primordial nuclosynthesis. Thompson, W.J., Carney, B.W. (eds.). Singapore: World Scientific 1990 (in press)
Delbar, T., Huyse, M., Vanhorenbeek, J.: Belgian Interuniversity Report RIB-1988-1
Buchmann, L., D'Auria, J.M.: Proceedings of Accelerated Radioactive Beams Workshop, Parksville, Canada, 1985 (TRI-85-1)
Rolfs, C., Jonson, B., Allardyce, B.W., Haas, H., Ravn, H.: Preliminary Proposal for the ISOLDE Collaboration, CERN (1989)
Tanihata, I.: Treat. Heavy Ion Sci.8, 443 (1989)
Ajzenberg-Selove, F.: Nucl. Phys. A433, 1 (1985); preprint (A=12)
Wapstra, A.H., Audi, G.: Nucl. Phys. A432, 1 (1985)
Armstrong, A.H., Frye, G.M.: Phys. Rev.103, 335 (1956)
Scobel, W., Bormann, M.: Z. Naturforsch.25a, 1406 (1970)
Bormann, M., Kaack, D., Schröder, V., Scobel, W., Wilde, L.: Z. Phys.258, 285 (1973)
Vourvopoulos, G., Kossionides, S., Paradellis, T.: Nuclear data for science and technology. Böckhoff, K.H. (ed.), p. 854. ECSC, EEC, EAEC Brussels and Luxembourg 1973
Vourvopoulos, G., Paradellis, T., Asthenopoulos, A.: Nucl. Instrum. Methods220, 23 (1984)
Andersen, H.H., Ziegler, J.F.: Hydrogen stopping powers and ranges in all elements. Oxford, New York: Pergamon 1977
Ziegler, J.F., Biersack, J.P., Littmark, U.: The stopping and range of ions in solids. Oxford, New York: Pergamon 1985
Liskien, H., Paulson, A.: Nucl. Data Tables11, 569 (1973)
Poppe, C.H.: Progress in fast neutron physics. Chicago: University of Chicago Press 1963
Ziegler, J.F.: Helium stopping powers and ranges in all elements. Oxford, New York: Pergamon 1977
Littmark, U., Ziegler, J.F.: Range distributions for energetic ions in all elements. Oxford, New York: Pergamon 1980
Marion, J.B., Young, F.C.: Nuclear reaction analysis. Amsterdam: North Holland 1968
Ajzenberg-Selove, F.: Nucl. Phys. A460, 1 (1986)
Rolfs, C., Rodney, W.S.: Cauldrons in the cosmos. Chicago: University of Chicago Press 1988
Scobel, W.: Z. Naturforsch.24a, 289 (1969)
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Supported in part by Deutsche Forschungsgemeinschaft (Ro429/ 15-4) and Friedrich Flick Förderungsstiftung
The authors would like to thank A. Asthenopoulos, N. Divis, and N. Papakostopoulos for their efforts in running the accelerator. We appreciate also the help of N. Andreopoulos, G. Prokos, A. Chionakis, and A. Sokos in the setup of the mechanical and electronic components of the experiment. Finally, we thank R.W. Kavanagh (Caltech) for fruitful comments on the manuscript.
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Paradellis, T., Kossionides, S., Doukellis, G. et al. AstrophysicalS(E) factor of8Li (α,n 0)11B and inhomogeneous Big Bang nucleosynthesis. Z. Physik A - Atomic Nuclei 337, 211–220 (1990). https://doi.org/10.1007/BF01294294
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DOI: https://doi.org/10.1007/BF01294294