Dipole excited states in 11Li with complex scaling

Garrido, E.; Fedorov, D. V.; Jensen, A. S.

doi:10.1016/s0375-9474(02)01020-5

Cited by 46 publications

(52 citation statements)

References 52 publications

(147 reference statements)

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“…Two years later, Hansen and Jonson [32] proposed the high probability of finding the weakly bound neutrons far away from the 11 Li inner core ( 9 Li), which makes the 11 Li matter density longer and defines it as a nuclear halo. In the same work [32], the existence of a soft dipole resonance was suggested, at low excitation energies, which has been supported by other experimental and theoretical works [33][34][35][36].…”

Section: Introductionsupporting

confidence: 61%

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Investigation of Coulomb dipole polarization effects on reactions involving exotic nuclei

2015

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We have analyzed elastic scattering angular distributions and total reaction cross sections of the exotic nuclei 9,11 Li on 208 Pb, at energies below and above the Coulomb barrier. For this purpose, we have used an optical potential with no adjustable parameters, composed by the nuclear São Paulo potential, derived from the nonlocal nature of the interaction, and the Coulomb dipole polarization potential, derived from the semiclassical theory of Coulomb excitation. Within this formalism, we identified an unusual long-range absorption for the 11 Li + 208 Pb system, which is dominated by the Coulomb interaction. We compare it to the absorption mechanisms observed for 6 He + 208 Pb which, unlike those of 11 Li + 208 Pb, take place at small interacting distances, where both Coulomb and nuclear interactions are important. The proposed approach shows to be a fundamental basis to study reactions involving exotic nuclei.

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Section: Introductionsupporting

confidence: 61%

“…In [44], the experimental breakup cross sections of 11 Li on 208 Pb are described by assuming a resonance with energy of 0.69 MeV (which is 0.32 MeV above the breakup threshold). Other theoretical models predict the existence of such low-lying dipole resonance [34][35][36].…”

Section: Discussionmentioning

confidence: 99%

Investigation of Coulomb dipole polarization effects on reactions involving exotic nuclei

2015

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“…This was further emphasized in the fairly successful prediction of the similar 1 − strength function for 11 Li in Ref. [38], which later on was accurately measured in Ref. [39].…”

Section: A Test Case: the Hoyle State In 12 Cmentioning

confidence: 77%

Necessary conditions for accurate computations of three-body partial decay widths

2008

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The partial width for decay of a resonance into three fragments is largely determined at distances where the energy is smaller than the effective potential producing the corresponding wave function. At short distances the many-body properties are accounted for by preformation or spectroscopic factors. We use the adiabatic expansion method combined with the WKB approximation to obtain the indispensable cluster model wave functions at intermediate and larger distances. We test the concept by deriving conditions for the minimal basis expressed in terms of partial waves and radial nodes. We compare results for different effective interactions and methods. Agreement is found with experimental values for a sufficiently large basis. We illustrate the ideas with realistic examples from α emission of 12 C and two-proton emission of 17 Ne. Basis requirements for accurate momentum distributions are briefly discussed.

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“…In many cases the bound states are well established, but very often their particle-unstable spectrum is much less known due to practical experimental difficulties. The excited 1 − state in 11 Li is a clear example [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Three-body properties of low-lying12Be resonances

et al. 2012

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We compute the three-body structure of the lowest resonances of 12 Be considered as two neutrons around an inert 10 Be core. This is an extension of the bound-state calculations of 12 Be into the continuum spectrum. We investigate the lowest resonances of angular momenta and parities, 0 ± , 1 − , and 2 + . Surprisingly enough, they all are naturally occurring in the three-body model. We calculate bulk structure dominated by small-distance properties as well as decays determined by the asymptotic large-distance structure. Both 0 + and 2 + have two-body 10 Be-neutron d-wave structure, while 1 − has an even mixture of p and d waves. The corresponding relative neutron-neutron partial waves are distributed among s, p, and d waves. The branching ratios show different mixtures of one-neutron emission, three-body direct, and sequential decays. We argue for spin and parities 0 + , 1 − , and 2 + for the resonances at 0.89, 2.03, and 5.13, respectively. The computed structures are in agreement with existing reaction measurements.

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Dipole excited states in 11Li with complex scaling

Cited by 46 publications

References 52 publications

Investigation of Coulomb dipole polarization effects on reactions involving exotic nuclei

Investigation of Coulomb dipole polarization effects on reactions involving exotic nuclei

Necessary conditions for accurate computations of three-body partial decay widths

Three-body properties of low-lying12Be resonances

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