Mapping the deformation in the “island of inversion”: Inelastic scattering of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ne</mml:mi><mml:mprescripts /><mml:none /><mml:mn>30</mml:mn></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mn>36</mml:mn></mml:mmultiscripts></mml:math>at intermediate energies

Doornenbal, P.; Scheit, H.; Takeuchi, Satoshi; Aoi, N.; Li, K.; Matsushita, M.; Steppenbeck, D.; Wang, Handing; Baba, H.; Ideguchi, E.; Kobayashi, N.; Kondo, Y.; Lee, J.; Michimasa, S.; Motobayashi, T.; Poves, A.; Sakuraï, H.; Takechi, M.; Togano, Y.; Yoneda, K.

doi:10.1103/physrevc.93.044306

Cited by 38 publications

(27 citation statements)

References 53 publications

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“…It suggests that the island of inversion (neutron-rich N ≃ 20 nuclei) and another region of nuclear deformation around 42 Si [148][149][150][151][152][153][154][155][156][157] where the magic number N = 28 is broken are merged. This is consistent with the recent observation [158,159] which confirmed the systematic deformations of Mg isotopes toward neutron drip line. The above-mentioned characteristics of Ne and Mg isotopes are reflected well to the reaction cross sections and matter radii.…”

Section: A Ground State Clustering In Be and B Isotopessupporting

confidence: 93%

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Kimura¹,

Suhara²,

Kanada-En’yo³

2016

Eur. Phys. J. A

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We present a review of recent works on clustering phenomena in unstable nuclei studied by antisymmetrized molecular dynamics (AMD). The AMD studies in these decades have uncovered novel types of clustering phenomena brought about by the excess neutrons. Among them, this review focuses on the molecule-like structure of unstable nuclei.One of the earliest discussions on the clustering in unstable nuclei was made for neutron-rich Be and B isotopes. AMD calculations predicted that the ground state clustering is enhanced or reduced depending on the number of excess neutrons. Today, the experiments are confirming this prediction as the change of the proton radii. Behind this enhancement and reduction of the clustering, there are underlying shell effects called molecular-and atomic-orbits. These orbits form covalent and ionic bonding of the clusters analogous to the atomic molecules. It was found that this "molecular-orbit picture" reasonably explains the low-lying spectra of Be isotopes. The molecular-orbit picture is extended to other systems having parity asymmetric cluster cores and to the three cluster systems. O and Ne isotopes are the candidates of the former, while the 3α linear chains in C isotopes are the latter. For both subjects, many intensive studies are now in progress.We also pay a special attention to the observables which are the fingerprint of the clustering. In particular, we focus on the monopole and dipole transitions which are recently regarded as good probe for the clustering. We discuss how they have and will reveal the exotic clustering.where X denotes Z i , ν or χ i . λ and µ are arbitrary numbers, but µ must have negative sign. The energy of the system H is defined as (8) As time t being evolved by the Eq. (7), the energy of the system is decreased and we obtain the set of parameters which minimizes the energy of the system. The calculation which employs the eigenstate of the parity Φ π to evaluate the energy is called variation before angular momentum projection (VBP), while the calculation employing the eigenstate of parity and angular momentum Φ Jπ M K is called variation after angular momentum projection (VAP) [42]. In the case of VBP, the angular momentum projection is performed after the energy minimization.To obtain the wave functions which have the configurations different from the energy minimum, the constrained energy minimization is often performed in VBP calculations. For example, the constraint on the quadrupole deformation parameter β is imposed by adding the constraint potential to the energy asHere, the magnitude of constraint potential v β is chosen large enough so that the deformation parameter β of the wave function approximately equals to β 0 after the energy minimization.Another way to obtain the excited configurations is orthogonalization method [42] that is used in VAP calculatons in which the variational wave function is orthogonalized to the energy minimum state By applying this procedure successively, the second, third and more excited configurations are obtained. He...

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Section: A Ground State Clustering In Be and B Isotopessupporting

confidence: 93%

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Kimura¹,

Suhara²,

Kanada-En’yo³

2016

Eur. Phys. J. A

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“…a simulation for determining the efficiency of the array due to the extended size of the target. Previously reported efficiency values were in agreement ( 6% error) with the simulation [39][40][41]. Figure 1 shows as an example the particle identification plot obtained with the BigRIPS and ZeroDegree spectrometers for the first setting.…”

Section: Methodssupporting

confidence: 79%

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Cortés¹,

Doornenbal²,

Dupuis³

et al. 2018

Phys. Rev. C

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Proton inelastic scattering of 72,74 Ni and 76,80 Zn ions at energies around 235 MeV/nucleon was performed at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. Angular integrated cross sections for direct inelastic scattering to the 2 + 1 and 4 + 1 states were measured. The Jeukenne-Lejeune-Mahaux folding model, extended beyond 200 MeV, was used together with neutron and proton densities stemming from quasiparticle random-phase approximation (QRPA) calculations to interpret the experimental cross sections and to infer neutron to proton matrix element ratios. In addition, coupled-channels calculations with a phenomenological potential were used to determine deformation lengths. For the Ni isotopes, correlations favor neutron excitations, thus conserving the Z = 28 gap. A dominance of proton excitation, on the other hand, is observed in the Zn isotopes, pointing to the conservation of the N = 50 gap approaching 78 Ni. These results are in agreement with QRPA and large-scale shell-model calculations.

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“…The beams of 30 Ne and 36 Mg impinged upon Pb and C targets. Inelastic scattering off C and relativistic Coulomb excitation on a Pb target revealed a B(E2) value and deformation length, respectively, that indicates a quadrupole deformation parameter of β 2 ≈ 0.5 for both, showing that the quadrupole deformation in the Mg chain persists towards the neutron dripline and that neutron excitations across N = 20 are critical for reproducing the collectivity of N = 20 30 Ne (Doornenbal et al, 2016). The telltale nature of the reduced B(E2; 0 + 1 → 2 + 1 ) value as nuclear structure observable is illustrated in the right panel of Fig.…”

Section: Electromagnetic Transition Strengthmentioning

confidence: 99%

Evolution of shell structure in exotic nuclei

et al. 2020

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The atomic nucleus is a quantum many-body system whose constituent nucleons (protons and neutrons) are subject to complex nucleon-nucleon interactions that include spin-and isospin-dependent components. For stable nuclei, already several decades ago, emerging seemingly regular patterns in some observables could be described successfully within a shell-model picture that results in particularly stable nuclei at certain magic fillings of the shells with protons and/or neutrons: N,Z = 8, 20, 28, 50, 82, 126. However, in short-lived, so-called exotic nuclei or rare isotopes, characterized by a large N/Z asymmetry and located far away from the valley of beta stability on the nuclear chart, these magic numbers, viewed through observables, were shown to change. These changes in the regime of exotic nuclei offer an unprecedented view at the roles of the various components of the nuclear force when theoretical descriptions are confronted with experimental data on exotic nuclei where certain effects are enhanced. This article reviews the driving forces behind shell evolution from a theoretical point of view and connects this to experimental signatures.

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Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

Cited by 38 publications

References 53 publications

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Evolution of shell structure in exotic nuclei

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