Low-energy cluster modes in 
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 nuclei

Mercier, F.; Bjelčić, A.; Nikšić, Tamara; Ebran, J.-P.; Khan, E.; Vretenar, Dario

doi:10.1103/physrevc.103.024303

Cited by 7 publications

(7 citation statements)

References 64 publications

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“…It ensures the convergence of our results below 1%. As explained in [14], the part of the strength with ω > 20 MeV may not be stable, with respect to the size of the basis. However, the position of the GMR centroids remains stable, and we aim to focus on the lowenergy part of the strength.…”

Section: Qfam Theoretical Frameworkmentioning

confidence: 99%

“…7. Evolution of the ratio (14), with the neutron number N , for various isotopic chains. The integration over soft neutron modes is performed up to ωsm ∼ 14−18 MeV, depending on the position of the GR for each nuclei.…”

Section: B Nickel Isotopesmentioning

confidence: 99%

“…Namely, in such cases, one observes a redistribution of the strength functions towards lower energy, below the GRs, associated with the emergence of new, exotic patterns of excitation [1][2][3]. The nature of these new excitations is basically twofold, namely (i) so-called soft modes involving resonant oscillations of a neutron skin against a tightly bound core [4][5][6][7], or nonresonant individual excitations [8,9] and (ii) cluster vibrations [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, cluster modes have mostly been investigated in light N = Z nuclei, both within the Antisymmetrized Molecular Dynamics (AMD) and Energy Density Functional (EDF) approaches [10][11][12][13][14]. How neutron excess interferes with such cluster modes, remains an open question.…”

Section: Introductionmentioning

confidence: 99%

“…properties [35,36]. Since a covariant formulation of the quasiparticle random phase approximation (QRPA), is known to correctly describe GRs and soft modes [21,23,[37][38][39][40][41][42][43] on one hand, as well as cluster vibrations [14] on the other, it shall be a tool of choice for achieving a global understanding of the mechanisms driving the emergence of these modes.…”

Section: Introductionmentioning

confidence: 99%

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Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes

Mercier,

Ebran,

Khan

2021

Preprint

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Background: Several recent experiments report significant low-energy isoscalar monopole strength, below the giant resonance, in various nuclei. In light α-conjugate nuclei, these low-energy resonances were recently interpreted as cluster vibration modes. However, the nature of these excitations in neutron-rich nuclei remain elusive. Purpose:The present work provides a systematic analysis of the low-energy monopole strength in isotopic chains, from Neon to Germanium, in order to monitor and understand its nature and conditions of emergence.Methods: We perform covariant quasiparticle random phase approximation (QRPA) calculations, formulated within the finite amplitude method (FAM), on top of constrained relativistic Hartree-Bogoliubov (RHB) reference states.Results: Neutron excess leads to the appearance of low-energy excitations according to a systematic pattern reflecting the single-particle features of the underlying RHB reference state. With the onset of deformation, these low-energy resonances get split and give rise to more complex patterns, with possible mixing with the giant resonance. At lower energy, cluster-like excitations found in N = Z systems survive in neutron-rich nuclei, with valence neutrons arranging in molecular-like orbitals. Finally, at very low energy, pair excitations are also found in superfluid nuclei, but remain negligible in most of the cases. Conclusions:The low-energy part of the monopole strength exhibits various modes, from cluster vibrations (∼ 5-10 MeV) to components of the giant resonance downshifted by the onset of deformation, including soft modes (∼ 10-15 MeV) as well as pair excitation (< 5 MeV), with possible mixing, depending on neutron-excess, deformation, and pairing energy.

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Section: Qfam Theoretical Frameworkmentioning

confidence: 99%

Section: B Nickel Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes

Mercier,

Ebran,

Khan

2021

Preprint

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Clusters in light nuclei: history and recent developments

Lombardo,

Dell’Aquila

2023

Riv. Nuovo Cim.

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In this review, we discuss recent advancements in the study of clustering phenomena occurring in light nuclei, and their influence on nuclear structure, dynamics, and astrophysics. In the introduction, we outline the historical steps leading to the concept of $$\alpha $$ α -clusterization in nuclei and provide a comprehensive description of the evolution of nuclear models capable to describe clustering aspects in nuclear systems and of the main experiments and discoveries leading to the development of this research field. We also describe some spectroscopic techniques that are used to establish the clustered nature of a given nuclear state. Some relevant experimental and theoretical findings recently reported both in experimental and theoretical works are discussed in the text. We put emphasis on recent achievements and remaining problems in the description of the structure of light isotopes, from helium to neon, including both self- and non-self-conjugate nuclei. Particular attention to the implication in the nuclear astrophysics context and to clustering effects in the dynamics of nuclear reactions is pursued all along the review.

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Computing the QRPA level density with the finite amplitude method

Bjelčić,

Schunck

2025

Computer Physics Communications

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Low-energy cluster modes in N=Z nuclei

Cited by 7 publications

References 64 publications

Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes

Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes

Clusters in light nuclei: history and recent developments

Computing the QRPA level density with the finite amplitude method

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