Cluster picture of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Li</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>7</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Walliser, Hans; Fließbach, Torsten

doi:10.1103/physrevc.31.2242

Cited by 27 publications

(19 citation statements)

References 20 publications

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“…The strong increase of the absolute value of the 7 Li quadrupole moment compared with that of 9 Li is not at all reproduced in this model space. If 7 Li is considered as a twocluster structure of 4 He and 3 H, then the enhanced quadrupole moment is reproduced well, Q clu = −38.5 mb [32]. Recently, a microscopic cluster-model calculation was performed for all Li isotopes up to A = 11 by use of the stochastic variational method [4,33].…”

Section: Discussionmentioning

confidence: 99%

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

et al. 2005

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The nuclear magnetic moment of 9 Li and the quadrupole moments of 8 Li and 9 Li have been measured by use of the β-asymmetry detection of nuclear magnetic resonance on optically polarized beams at ISOLDE/CERN. The radioactive beams were implanted in Si for g-factor measurements and in Zn, LiNbO 3 , and LiTaO 3 crystals for quadrupole moment measurements. The electric-field gradient V zz = 4.26(4) × 10 15 V/cm 2 is deduced for Li in Zn. Using a recently adopted reference value, Q( 7 Li) = −40.0(3) mb, we reevaluated all earlier reported nuclear quadrupole moments of 8 Li and 9 Li. Based on all available previous and present data, the adopted quadrupole moments for these isotopes are Q( 8 Li) = +31.4(2) mb and Q( 9 Li) = −30.6(2) mb. The magnetic moment of 9 Li is deduced as µ( 9 Li) = 3.43678(6)µ N . The values are compared with predictions from shell-model and cluster-model calculations.

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Section: Discussionmentioning

confidence: 99%

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

et al. 2005

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“…Walliser and Fliessbach [16] discuss a cluster picture for 7 Li, in which the constituents of the nucleus (the α and t particles) are treated as elementary, that is without internal structure, but not necessarily point-like. They obtain considerable agreement with experimental data and we conform, in principle, to their model.…”

Section: Dicluster Description Of 7 LImentioning

confidence: 99%

Electromagnetic response and breakup of light weakly bound nuclei in a dicluster model

Fortunato

Vitturi

2005

Eur. Phys. J. A

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The light weakly-bound nucleus 7 Li is studied within a dicluster α + t picture. Different observables obtained within our simple model are compared with previous calculations and experiments showing good agreement. In particular we calculate dipole and quadrupole electromagnetic response to the continuum. The energy distribution of B(Eλ) values are consistent with the energy weighted molecular sum rule and display a sizable contribution of non-resonant character arising from the weak binding property. The corresponding form factors for excitations to the continuum are used in a semiclassical coupled channel scheme to get estimates for the break-up cross section in a heavy ion reaction. The nuclear contribution is found to play an important role in the process for bombarding energies around the Coulomb barrier. The masses and charges ratios of the two clusters are shown to lead to features of the cluster halo that may significantly differ from the one usually associated with one-nucleon haloes.

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“…We adhere to the description of 7 Li as a dicluster system formed by an α plus a t. It was shown by many authors [1] that this way of treating the system gives a good description of the properties of the nucleus under study. We solved the Schrödinger equation for the relative motion of the two clusters (considered as frozen spherical distributions of charge and mass).…”

Section: Discussion Of the Modelmentioning

confidence: 99%

Breakup and Electromagnetic Response of Light Weakly-Bound Dicluster Systems

Fortunato¹

2003

Acta Physica Hungarica A) Heavy Ion Physics

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This study is focused on the break-up and electromagnetic response of light weakly-bound dicluster nuclei. The cluster picture in the case of 7 Li is shown to be a very good approximation and in this framework we calculate nuclear structure observables. We solve the Schrödinger equation for the relative motion both for discrete and continuum states and this automatically takes into a proper account the role of resonances. A concentration of strength in the low energy continuum, solely due to the weakly-bound nature of the bound states is seen and explained as a favourable matching between the wavelengths of the initial and final states. Finally preliminary results on form factors are briefly outlined and their microscopic derivation as well as utilization in reaction studies is discussed.

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Cluster picture ofLi7

Cited by 27 publications

References 20 publications

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

Electromagnetic response and breakup of light weakly bound nuclei in a dicluster model

Breakup and Electromagnetic Response of Light Weakly-Bound Dicluster Systems

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