Effects of deformation in the three-body structure of

Brida, I.; Nunes, F. M.; Brown, B. A.

doi:10.1016/j.nuclphysa.2006.06.012

Cited by 19 publications

(32 citation statements)

References 42 publications

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“…All models D3B, D, and S include the GPT NN interaction [26], as in previous three-body studies [27,28,29,30]. This interaction reproduces NN observables up to 300 MeV.…”

Section: B Description Of Modelsmentioning

confidence: 82%

Three-body model for the two-neutron emission ofBe16

2017

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Background: While diproton decay was first theorized in 1960 and first measured in 2002, it was first observed only in 2012.The measurement of 14 Be in coincidence with two neutrons suggests that 16 Be does decay through the simultaneous emission of two strongly correlated neutrons.Purpose: In this work, we construct a full three-body model of 16 Be (as 14 Be + n + n) in order to investigate its configuration in the continuum and in particular the structure of its ground state.Method: In order to describe the three-body system, effective n-14 Be potentials were constructed, constrained by the experimental information on 15 Be. The hyperspherical R-matrix method was used to solve the three-body scattering problem, and the resonance energy of 16 Be was extracted from a phase shift analysis.Results: In order to reproduce the experimental resonance energy of 16 Be within this three-body model, a three-body interaction was needed. For extracting the width of the ground state of 16 Be, we use the full width at half maximum of the derivative of the three-body phase shifts and the width of the three-body elastic scattering cross section. Conclusions:Our results confirm a dineutron structure for 16 Be, dependent on the internal structure of the subsystem 15 Be.

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“…All models D3B, D, and S include the GPT NN interaction [26], as in previous three-body studies [27,28,29,30]. This interaction reproduces NN observables up to 300 MeV.…”

Section: B Description Of Modelsmentioning

confidence: 82%

Three-body model for the two-neutron emission ofBe16

2017

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“…This state-dependence in the 9 Li-n potential is phenomenologically determined in order to satisfy the experimental observations of a large s 2 component and a two-neutronseparation energy of 11 Li, and a virtual s-state in 10 Li, simultaneously. On the other hand, for the nn part, the interaction having a mild short-range repulsion [11,18] or the density-dependent one are often used [8]. However, even in the microscopic cluster models using an unique effective N N interaction consisting of the central and LS forces [10,14], the s-p shell gap problem in 11 Li and 10 Li cannot be solved simultaneously.…”

Section: B Effective Interactionsmentioning

confidence: 99%

Roles of tensor and pairing correlations on halo formation inLi11

Myo¹,

Katō

Toki³

et al. 2007

Phys. Rev. C

111

183

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We study the roles of the tensor and pairing correlations on the halo formation in 11 Li with an extended 9 Li+n+n model. We first solve the ground state of 9 Li in the shell model basis by taking 2p-2h states using the Gaussian functions with variational size parameters to take into account the tensor correlation fully. In 11 Li, the tensor and pairing correlations in 9 Li are Pauli-blocked by additional two neutrons, which work coherently to make the configurations containing the 0p 1/2 state pushed up and close to those containing the 1s 1/2 state. Hence, the pairing interaction works efficiently to mix the two configurations by equal amount and develop the halo structure in 11 Li. For 10 Li, the inversion phenomenon of s-and p-states is reproduced in the same framework. Our model furthermore explains the recently observed Coulomb breakup strength and charge radius for 11 Li.

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“…These core-neutron interactions are adjusted by reproducing the structure of the A − 1 system, where A is the mass of the two-neutron halo nucleus; for 11 Li, the core is 10 Li. The continuum state structure of 10 Li and in particular the energies of the 1s 1/2 and 0p 1/2 single-particle levels are used in fitting these interactions [2,3]. As an example, the measurement of a low-lying negative parity state in 10 Li [4,5] and its subsequent inclusion in theoretical calculations was essential to reproducing the binding energy of 11 Li [2,6].…”

mentioning

confidence: 99%

Selective population of unbound states in 10Li

et al. 2015

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Unbound positive-parity states in 10 Li have been populated with a two-proton removal reaction from a 71 MeV/u 12 B beam. The 9 Li fragments and emitted neutrons were measured with the MoNA-LISASweeper setup. The measured decay energy spectrum was best fit with three states at 110 ± 40, 500 ± 100, and 1100 ± 100 keV decay energy. This is the second observation of a resonance below 200 keV. The lower two states likely belong to the expected 1 + , 2 + doublet.

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Effects of deformation in the three-body structure of

Cited by 19 publications

References 42 publications

Three-body model for the two-neutron emission ofBe16

Three-body model for the two-neutron emission ofBe16

Roles of tensor and pairing correlations on halo formation inLi11

Selective population of unbound states in 10Li

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