Elsevier

Nuclear Physics A

Volume 174, Issue 1, 11 October 1971, Pages 173-192
Nuclear Physics A

Magnetization distribution of the 7Li nucleus as obtained from electron scattering through 180°. The electric quadrupole moment of 7Li

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Abstract

Cross sections for scattering of electrons from the ground state doublet of 7Li have been measured in the energy range of 25 to 90 MeV with an energy resolution better than 200 keV. From the cross sections for transverse elastic scattering measured at 180° the rms radius of the ground state magnetization density distribution has been determined: 〈r2M12 = 2.98 ± 0.05 fm. The value of the reduced transition probability for M1 excitation of the first excited level has been determined from the ratio of transverse inelastic and elastic cross sections at 180°. The result [B(M1, ↑; 478 keV)=2.50±0.12 μN2] agrees very well with the result of lifetime measurements. The cross sections for longitudinal (C2) excitation of this level have been extracted from scattering through angles of 90° to 150°. The measured reduced transition probability [B(C2, ↑; 478 keV)=7±4 fm4] is compared with the values obtained by several other experimental methods. In a shell-model analysis our data can be considered to measure the size of the 1p shell. The resulting value (a1p=1.90±0.03 fm) is much larger than the one determined from earlier electron scattering experiments, where the 478 keV level was not resolved. A relative measurement of the longitudinal elastic scattering from 7Li and from 6Li showed no isotopic effect on the rms charge radius: 〈r2712/〈r2612=1.001±0.008. Accepting the measured rms charge radius for 6Li this corresponds to a1s=a1p=1.90 fm for 7Li reconfirming the above value. The data are compared with shell-model and projected Hartree-Fock calculations.

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