Photo-response of the N=Z nucleus 24Mg
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AbstractThe electricE1 and magneticM1 dipole responses of the$$N=Z$$N=Znucleus$$^{24}$$24Mg were investigated in an inelastic photon scattering experiment. The 13.0MeV electrons, which were used to produce the unpolarised bremsstrahlung in the entrance channel of the$$^{24}$$24Mg($$gamma ,gamma ^{prime }$$,) reaction, were delivered by the ELBE accelerator of the Helmholtz-Zentrum Dresden-Rossendorf. The collimated bremsstrahlung photons excited one$$J^{pi }=1^-$$J=1-, four$$J^{pi }=1^+$$J=1+, and six$$J^{pi }=2^+$$J=2+states in$$^{24}$$24Mg. De-excitation$$gamma $$rays were detected using the four high-purity germanium detectors of the$$gamma $$ELBE setup, which is dedicated to nuclear resonance fluorescence experiments. In the energy region up to 13.0MeV a total$$B(M1)uparrow = 2.7(3)~mu _N^2$$B(M1)=2.7(3)N2is observed, but this$$N=Z$$N=Znucleus exhibits only marginalE1 strength of less than$$sum B(E1)uparrow le 0.61 imes 10^{-3}$$B(E1)0.6110-3e$$^2 , $$2fm$$^2$$2. The$$B(varPi 1, 1^{pi }_i ightarrow 2^+_1)/B(varPi 1, 1^{pi }_i ightarrow 0^+_{gs})$$B(1,1i21
