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Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Elektromagnetische und Hadronische Sonden

HK 24.3: Vortrag

Mittwoch, 14. März 2007, 11:45–12:00, A

Measurement of the deuteron electrodisintegration under 180 at the S-DALINAC — •N. Ryezayeva, O. Burda, A. Byelikov, M. Chernykh, Y. Kalmykov, P. von Neumann-Cosel, I. Pysmenetska, I. Poltoratska, S. Rathi, A. Richter, and A. Shevchenko — Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

Studies of the 2H(e,e′) reaction at Θ = 180 were performed at the S-DALINAC at an incident electron energy E0 = 27.8 MeV and 74 MeV. At such low momentum transfers (q = 0.28 fm−1 and 0.72 fm−1, respectively) magnetic dipole transitions are expected to give the dominant contributions to the breakup cross sections. An energy resolution of ΔE = 45 keV (FWHM) was achieved at the lower incident energy. Thus, the measured deuteron-electrodisintegration cross section at threshold can be used to obtain the cross section for the npd γ reaction applying the principle of detailed balance. Accurate information about this process is of great interest in nuclear astrophysics, specifically with regard to Big-Bang nucleosynthesis [1]. The experimental data are in excellent agreement with theoretical calculations based on a nucleon-nucleon potential model, after the inclusion of meson-exchange and isobar effects.
[1] S. Burles et al., Phys. Rev. Lett. 82, 4176 (1999).
 Supported by the DFG through SFB 634.

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