Elsevier

Nuclear Physics A

Volume 515, Issue 2, 27 August 1990, Pages 226-236
Nuclear Physics A

The first excited state of 8Be studied in the 7Li(p, γ)8Be reaction

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Abstract

In order to study the intrinsic line shape of the broad first excited 2+ state of 8Be, the radiative capture reaction 7Li(p,γ)8Be has been investigated in an energy range close to the center of the giant dipole resonance built upon this state. A large NaI(Tl) spectrometer with a well-known response function is employed. The data are fitted with spectral density functions derived from αα phase shifts in the framework of the R- matrix theory. The optimum value of the channel radius obtained from the fits, a = 4.5 fm, is in agreement with the value deduced from a similar analysis of a kinematically complete coincidence study of the 9Be(d,tα)4He reaction. The calculated spectral density function for a = 4.5 fm reaches its maximum at Ex = 2.91 MeV, the width (FWHM) is 1.23 MeV.

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    Work supported by the Deutsche Forschungsgemeinschaft.

    1

    Present address: Physik-Institut der Universität Zürich, CH-8001 Zürich, Switzerland.

    2

    Alexander von Humboldt Fellow.

    3

    Present address: Institute of Nuclear Physics, 31342 Cracow, ul. Radzikowskiego 152, Poland.

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