Book/Report

FZJ-2018-03566

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Delta-Anregungen in Kernen mittels der ($\overrightarrow{d}$,2p)- Reaktion

Oltmanns, P. (Corresponding author)FZJ*

1991
Forschungszentrum Jülich GmbH Zentralbibliothek Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18931

Report No.: Juel-2510

Abstract: Several investigations of $\Delta$ excitations in nuclei induced by intermediate energy cliarge excha.nge reactions have revealed a systematic downward energyshift of the $\Delta$(1232)-resonance peak position for targets with A $\geq$ 12 with respect to that observed for a proton target. The non - trivial part of this shift is caused by a coherent medium effect on the spin - longitudinal response function. To obtain more inforrnation on the spin - longitudinal ($\sim \overrightarrow{\sigma} \cdot \hat{q}$ ) and spin - transverse($\sim \overrightarrow{\sigma}$ x $\hat{q}$) contributions to the (p, n)- and ($^{3}$He, t)-cross sections, the ($\overrightarrow{d}$, 2p) - reaction has been performed that we describe consistently with both of the previously mentioned reactions. We show by analysis of the cross section and analysing power of the p($\overrightarrow{d}$, 2p)$\Delta^{0}$ - process that there is a constant ratio of spin -transverse to spin - longitudinal excitation. This ratio aniounts to 2:1. We cannot, however, describe the analysing power data of the $^{12}$C($\overrightarrow{d}$, 2p) - reaction satisfactorily. This is probably due to the fact that the experimental cross section contains contributions different from the actual $\Delta$ - excitation.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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