7Li form factors in a microscopic cluster calculation

doi:10.1016/0370-2693(91)90316-I

Physics Letters B

Volume 261, Issue 3, 30 May 1991, Pages 211-216

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Abstract

Longitudinal and transverse electromagnetic form factors are calculated for the transitions into the three lowest ⁷Li states for momentum transfers q up to 5 fm⁻¹ in the framework of the resonating group model. Most of the data are described well if the wave functions contain not only an α−t structure but also additional configurations. Mesonic effects yield only smaller corrections and lead to rather unspecific structures in the form factors at large momentum transfers.

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1995, Nuclear Physics, Section A
The two-cluster photodisintegration of the ⁶Li and ⁷Li nuclei through the $^{3} He +^{3} H$ and $^{4} He +^{3} H$ channels, respectively, has been studied. The experiments were performed with polarized-photon beams. Differential cross sections up to E_γ ≈ 90 MeV and the Σ-asymmetry of the disintegration by polarized photons up to E_γ ≈ 70 MeV at θ_c.m. = 90° were measured. The measured data were treated in the framework of the cluster approach to the structure of these nuclei.
Large-basis space and mesonic effects on the 7Li form factors
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The electron-scattering form factors of ⁷Li are investigated in the nuclear shell model. Calculations have been performed in the Op-shell-model space as well as in the complete (0 + 2)ħ;ω model space. Meson-exchange-current corrections to the transverse form factors are included. Only in the extended model space we find good agreement with experiment for all calculated form factors up to momentum transfer 3 fm⁻¹. Meson exchange currents enhance the transverse form factors at large momentum transfer, bringing theory considerably closer to experiment. For the transition to the $J^{π} = 72^{−}$ second excited state (E_x = 4.63MeV) we find that the high multipoles E4 and M5, which dominate the transverse form factor at momentum transfer q>3fm⁻¹, are mainly induced by meson exchange currents and not by the nuclear structure involved. A comparison of the transverse form factor of the $J^{π} = 72^{−1}$ state to the one of the $J^{π} = 12^{−}$ first excited state (E_x = 0.478 MeV) seems to give experimental confirmation of this finding.
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Study the Nuclear Form Factors of Low-Lying Excited States in 7Li Nucleus Using the Shell Model with Skyrme Effective Interaction
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^☆: This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 06 ER 703.

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Physics Letters B

Abstract

References (14)

Nucl. Phys. A

Nucl. Phys. A

Nucl. Phys. A

Phys. Rev. C

Nucl. Phys. A

Nucl. Phys. A

Cited by (19)

Energy levels of light nuclei A = 5, 6, 7

Core-polarization effects on C2 form factors of p -shell nuclei

Two-cluster disintegration of <sup>6</sup>Li and <sup>7</sup>Li nuclei by linearly polarized photons

Large-basis space and mesonic effects on the <sup>7</sup>Li form factors

Core polarization effects up to 12 hω in <sup>7</sup>Li and <sup>10</sup>B nuclei

Study the Nuclear Form Factors of Low-Lying Excited States in <sup>7</sup>Li Nucleus Using the Shell Model with Skyrme Effective Interaction

7Li form factors in a microscopic cluster calculation☆

Abstract

Nucl. Phys. A

Nucl. Phys. A

Nucl. Phys. A

Phys. Rev. C

Nucl. Phys. A

Nucl. Phys. A

⁷Li form factors in a microscopic cluster calculation☆