Giant resonances in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>238</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>within the quasiparticle random-phase approximation with the Gogny force

Péru, S.; Gosselin, G.; Martini, M.; Dupuis, Marc; Hilaire, Stéphane; Devaux, J.-C.

doi:10.1103/physrevc.83.014314

Cited by 73 publications

(93 citation statements)

References 37 publications

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“…Solutions for axially deformed nuclei are |N ≡ |K , where K is the total angular momentum projection on the symmetry axis in the intrinsic frame. Details about the RPA and QRPA formalisms for spherical and axially deformed targets are provided in [11,14,15] and [12,16], respectively.…”

Section: Direct Pre-equilibrium Emissionmentioning

confidence: 99%

“…Transition potentials are calculated a e-mail: marc.dupuis@cea.fr considering rearrangement corrections [10]. Nuclear structure ingredients, namely local matter densities for the nucleus ground state (GS), as well as energy, spin, parity and local transition densities for each target excitations, are calculated within the (Q)RPA model [11,12] implemented with the Gogny D1S interaction [13].…”

Section: Introductionmentioning

confidence: 99%

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Microscopic modeling of direct pre-equilibrium emission from neutron induced reactions on even and odd actinides

et al. 2017

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Abstract. Direct inelastic scattering to discrete excitations and pre-equilibrium emission are described within a microscopic model. Nuclear structure information are obtained in the (Quasi) Random Phase Approximation ( (Q)RPA) framework implemented with the Gogny force. The relevant optical and transition potentials are build considering the JLM folding model. Various successful applications are shown for (n,n), (n,n'), (n,xn) and (n,xnγ ) reactions for spherical and axially deformed even-even or odd targets. The rearrangement corrections to transition potentials and the contribution of unnatural parity excitations to pre-equilibrium emission are discussed. Our model predictions for (n,n'γ ) reactions, for intra-and inter-band transitions in 238 U, and for the 239 Pu(n,2n) cross section are analyzed.

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Section: Direct Pre-equilibrium Emissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microscopic modeling of direct pre-equilibrium emission from neutron induced reactions on even and odd actinides

et al. 2017

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“…Recently, we developed a scaled parallel Skyrme-QRPA code [10] for arbitrary axially-deformed (parity conserving) even-even nuclei. Our code is one of the few [11] to treat heavy deformed nuclei in the QRPA without simplification. (For other calculations, including those in lighter nuclei and those in the RPA, the spherical QRPA, and separable approximations, see the work cited * Present address: Center for Computational Sciences, University of Tsukuba, Tsukuba, 305-8577, Japan in Ref.…”

Section: Introductionmentioning

confidence: 99%

Testing Skyrme energy-density functionals with the quasiparticle random-phase approximation in low-lying vibrational states of rare-earth nuclei

Terasaki

Engel

2011

Phys. Rev. C

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Although nuclear energy density functionals are determined primarily by fitting to ground state properties, they are often applied in nuclear astrophysics to excited states, usually through the quasiparticle random phase approximation (QRPA). Here we test the Skyrme functionals SkM * and SLy4 along with the self-consistent QRPA by calculating properties of low-lying vibrational states in a large number of well-deformed even-even rare-earth nuclei. We reproduce trends in energies and transition probabilities associated with γ-vibrational states, but our results are not perfect and indicate the presences of multi-particle-hole correlations that are not included in the QRPA. The Skyrme functional SkM * performs noticeably better than SLy4. In a few nuclei, changes in the treatment of the pairing energy functional have a significant effect. The QRPA is less successful with "β-vibrational" states than with the γ-vibrational states.

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“…This work represents a transposition to the charge-exchange field of the fully consistent axially-symmetric-deformed QRPA calculations presented in [3] and devoted to the study of the electromagnetic excitation of deformed nuclei [4,5]. In this approach pairing correlations which play an important role in open shell nuclei are automatically included.…”

mentioning

confidence: 99%

“…Consequently, pnQRPA calculations can be performed separately for each K π block. To solve the pnQRPA matrix equation we use the same numerical procedure as recently applied to the study of giant resonances of the heavy deformed 238 U [4]. This procedure is based on a massive parallel master-slave algorithm.…”

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confidence: 99%

Gamow-Teller strength in deformed nuclei within self-consistent pnQRPA with the Gogny force

Martini

Péru

Goriely

2014

EPJ Web of Conferences

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Abstract. In recent years fully consistent quasiparticle random-phase approximation (QRPA) calculations using finite range Gogny force have been performed to study electromagnetic excitations of several axially-symmetric deformed nuclei up to the 238 U. Here we present the extension of this approach to the charge-exchange nuclear excitations (pn-QRPA). In particular we focus on the Gamow-Teller (GT) excitations. A comparison of the predicted GT strength distribution with existing experimental data is presented. The role of nuclear deformation is shown. Special attention is paid to β-decay half-lives calculations for which experimental data exist.Spin-isospin nuclear excitations, in particular the Gamow-Teller (GT) resonances, play nowadays a crucial role in several fields of physics. First, in nuclear physics since they can provide informations on the nuclear interaction, on the equation of state of asymmetric nuclear matter and on the nuclear skin thickness. Second, in astrophysics, since they influence stellar evolution and nucleosynthesis by governing the electroweak processes. Finally, in particle physics in connection with the neutrino physics beyond the standard model and the evaluation of the V ud element of the Cabibbo-KobayashiMaskawa quark-mixing matrix.Experimentally the spin-isospin nuclear excitations are studied via charge-exchange reactions, such as (p, n), (n, p), (d, 2 He), ( 3 He, t) or (t, 3 He) and β-decay measurements. In spite of the great efforts and interest, the whole nuclear chart cannot be experimentally studied. To study the nuclei experimentally inacessible one can rely on theoretical models. In this context one of the most employed models is the so called proton-neutron quasiparticle random-phase approximation (pnQRPA). To treat consistently isotopic chains from drip line to drip line two main features of the theoretical model are in order: the possibility to deal with deformed nuclei and the use of an unique effective nuclear force. The term unique has here two meanings. First of all, it means that the interaction is the same for all the nuclei; second, that the nuclear interaction used to describe the ground state and the excited states is the same (this is the so-called self-consistency of the calculation). In spite of the relatively large number of pnQRPA calculations, only a very few of those include both features. Furthermore, even in such self-consistent calculations, it remains at least one coupling constant, typically in the particle-particle channel, which should be considered as a free parameter usually fitted to half-lives or to the experimental position of the GT excitation energy.Here we present the fully consistent axially-symmetric-deformed pnQRPA calculation based on the finite range Gogny force. The originality of the present work consists in the use of the Gogny a

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Giant resonances inU238within the quasiparticle random-phase approximation with the Gogny force

Cited by 73 publications

References 37 publications

Microscopic modeling of direct pre-equilibrium emission from neutron induced reactions on even and odd actinides

Microscopic modeling of direct pre-equilibrium emission from neutron induced reactions on even and odd actinides

Testing Skyrme energy-density functionals with the quasiparticle random-phase approximation in low-lying vibrational states of rare-earth nuclei

Gamow-Teller strength in deformed nuclei within self-consistent pnQRPA with the Gogny force

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