Dissolution of shell structures and the polarizability of dripline nuclei

Lenske, H.; Tsoneva, N.

doi:10.1140/epja/i2019-12811-6

Cited by 22 publications

(22 citation statements)

References 80 publications

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“…The origin of the remaining difference between the theoretical and experimental results is not easy to access. On a nuclear structure side, there is some room left for refinements of the nuclear response functions by going deeper into the dynamics of polarization effects, e.g., in the multi-phonon approach of Lenske and Tsoneva (2019) or by second RPA methods of Gambacurta et al (2020). On the reaction side, the competing sequential nucleon transfer mechanism should be studied, mainly for reasons of completeness.…”

Section: Discussionmentioning

confidence: 99%

“…Residual interactions are determined self-consistently in the context of Fermi-liquid theory. The single quasi-particle states are derived from Hartree-Fock-Bogoliubov (HFB) calculations with state-dependent pairing gaps, describing the ground state properties of the involved nuclei very accurately (Lenske and Tsoneva, 2019). The HFB wave functions and the QRPA configuration amplitudes are used to construct the radial transitions densities, entering finally into the charge exchange transition form factors.…”

Section: The Charge Exchange Reaction Channelmentioning

confidence: 99%

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A Constrained Analysis of the 40Ca(18O,18F)40K Direct Charge Exchange Reaction Mechanism at 275 MeV

Cavallaro

Bellone

Calabrese

et al. 2021

Front. Astron. Space Sci.

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The 40Ca(18O,18F)40K single charge exchange (SCE) reaction is explored at an incident energy of 275 MeV and analyzed consistently by collecting the elastic scattering and inelastic scattering data under the same experimental conditions. Full quantum-mechanical SCE calculations of the direct mechanism are performed by including microscopic nuclear structure inputs and adopting either a bare optical potential or a coupled channel equivalent polarization potential (CCEP) constrained by the elastic and inelastic data. The direct SCE mechanism describes the magnitude and shape of the angular distributions rather well, thus suggesting the suppression of sequential multi-nucleon transfer processes.

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Section: Discussionmentioning

confidence: 99%

Section: The Charge Exchange Reaction Channelmentioning

confidence: 99%

A Constrained Analysis of the 40Ca(18O,18F)40K Direct Charge Exchange Reaction Mechanism at 275 MeV

Cavallaro

Bellone

Calabrese

et al. 2021

Front. Astron. Space Sci.

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“…The evaluation of V N N is especially simple in infinite matter and momentum representation [112,114,179]. However, it is well known that descriptions in terms of only two-body G-matrix interactions neither reproduce properly the empirically known EoS of infinite nuclear matter nor do they lead to proper results for finite nuclei.…”

Section: Energy-density Functionals and Microscopic Interactionsmentioning

confidence: 99%

“…Their influential approach [111] started from the BHF theory and then using the density matrix expansion (DME) method to reduce the highly non-local BHF G-matrix interactions to a local form as in the Skyrme model. The same spirit is underlying the nonrelativistic GEDF in starting from the Brueckner G-matrix interactions [112] but supplementing later three-body forces [113,114]. The new aspect of GEDF method was to express interactions in terms of meson exchange interactions with density-dependent coupling constants [112].…”

Section: Introductionmentioning

confidence: 99%

Self-consistent methods for structure and production of heavy and superheavy nuclei

et al. 2021

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Self-consistent methods for the structure of heavy and superheavy nuclei are reviewed. The construction and application of energy-density functionals are discussed. The relationship between the self-consistent methods and microscopic-macroscopic approaches is considered on the mean-field level. The extraction of single-particle potentials from the energy-density functional is described. The isotopic dependence of nucleon distributions and its influence on the nucleus-nucleus interaction is analyzed. As a new additional condition we introduce that the energy-density functional must describe the heights of the Coulomb barriers in nucleusnucleus interaction potentials, thus imposing constraints on the properties of the functional at low matter densities. The self-consistent methods are applied to describe the quasiparticle structure, cluster radioactivity, and fission of the heaviest nuclei. These methods are used to predict the probabilities of β-delayed multi-neutron emission and half-lives of β-decays and electron captures in heavy and superheavy nuclei. The predicted properties of superheavy nuclei are used to estimate the production cross-sections of superheavy nuclei in complete fusion reactions. Contents

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“…We point out that the s.p. energies problem is not a matter of the interaction parameters but originate in the quasiparticle spectrum, which indicates the necessity to go beyond the static mean-field formalism 37,38 . In the QPM the wave functions of the excited states of an even-odd nucleus are constructed from a combination of quasiparticles originating from the singleparticle orbitals and excitation phonons that are constructed from the excited states in the neighbouring even-even core nucleus :…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic character of the competitive γγ/γ-decay from 137mBa

et al. 2020

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Second-order processes in physics is a research topic focusing attention from several fields worldwide including, for example, non-linear quantum electrodynamics with high-power lasers, neutrinoless double-β decay, and stimulated atomic two-photon transitions. For the electromagnetic nuclear interaction, the observation of the competitive double-γ decay from 137m Ba has opened up the nuclear structure field for detailed investigation of second-order processes through the manifestation of off-diagonal nuclear polarisability. Here, we confirm this observation with an 8.7σ significance, and an improved value on the double-photon versus single-photon branching ratio as 2.62 × 10 −6 (30). Our results, however, contradict the conclusions from the original experiment, where the decay was interpreted to be dominated by a quadrupole-quadrupole component. Here, we find a substantial enhancement in the energy distribution consistent with a dominating octupole-dipole character and a rather small quadrupole-quadrupole component in the decay, hindered due to an evolution of the internal nuclear structure. The implied strongly hindered double-photon branching in 137m Ba opens up the possibility of the double-photon branching as a feasible tool for nuclear-structure studies on off-diagonal polarisability in nuclei where this hindrance is not present.

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Dissolution of shell structures and the polarizability of dripline nuclei

Cited by 22 publications

References 80 publications

A Constrained Analysis of the 40Ca(18O,18F)40K Direct Charge Exchange Reaction Mechanism at 275 MeV

A Constrained Analysis of the 40Ca(18O,18F)40K Direct Charge Exchange Reaction Mechanism at 275 MeV

Self-consistent methods for structure and production of heavy and superheavy nuclei

Electromagnetic character of the competitive γγ/γ-decay from 137mBa

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