Ab initio calculations of reactions with light nuclei

Quaglioni, Sofia; Hupin, Guillaume; Calci, Angelo; Navrátil, Petr; Roth, Robert

doi:10.1051/epjconf/201611301005

Cited by 4 publications

(3 citation statements)

References 46 publications

(106 reference statements)

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“…To both interpret recent data and guide new experiments, it is important to theoretically map the evolution of α D as a function of neutron number. Theories that can reliably address exotic nuclei far from the valley of stability are needed and ab initio methods are best positioned to deliver both predictive power [19][20][21] and estimates of the theoretical uncertainties [22][23][24][25]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Electric dipole polarizability from first principles calculations

et al. 2016

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The electric dipole polarizability quantifies the low-energy behavior of the dipole strength and is related to critical observables such as the radii of the proton and neutron distributions. Its computation is challenging because most of the dipole strength lies in the scattering continuum. In this paper we combine integral transforms with the coupled-cluster method and compute the dipole polarizability using bound-state techniques. Employing different interactions from chiral effective field theory, we confirm the strong correlation between the dipole polarizability and the charge radius, and study its dependence on three-nucleon forces. We find good agreement with data for the 4 He, 40 Ca, and 16 O nuclei, and predict the dipole polarizability for the rare nucleus 22 O.

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Section: Introductionmentioning

confidence: 99%

Electric dipole polarizability from first principles calculations

et al. 2016

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“…Work in this direction is under way with the first preliminary results published in Ref. [193]. In Fig.…”

Section: The 3 H(d N) 4 He Fusionmentioning

confidence: 87%

Unified ab initio approaches to nuclear structure and reactions

Navratil,

Quaglioni,

Hupin

et al. 2016

Preprint

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The description of nuclei starting from the constituent nucleons and the realistic interactions among them has been a long-standing goal in nuclear physics. In addition to the complex nature of the nuclear forces, with two-, three-and possibly higher many-nucleon components, one faces the quantum-mechanical many-nucleon problem governed by an interplay between bound and continuum states. In recent years, significant progress has been made in ab initio nuclear structure and reaction calculations based on input from QCD-employing Hamiltonians constructed within chiral effective field theory. After a brief overview of the field, we focus on ab initio many-body approaches -built upon the No-Core Shell Model -that are capable of simultaneously describing both bound and scattering nuclear states, and present results for resonances in light nuclei, reactions important for astrophysics and fusion research. In particular, we review recent calculations of resonances in the 6 He halo nucleus, of five-and six-nucleon scattering, and an investigation of the role of chiral threenucleon interactions in the structure of 9 Be. Further, we discuss applications to the 7 Be(p, γ) 8 B radiative capture. Finally, we highlight our efforts to describe transfer reactions including the 3 H(d, n) 4 He fusion.

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“…* Email:duweigy@gmail.com Indeed, various predictive methods have been developed for precision calculations of the reaction p(n, γ)d based on either the pionless effective field theory [33][34][35][36][37] or the pionful χEFT [19,38] as alternatives to traditional approaches based on phenomenological models for the nuclear interactions and currents [39][40][41]. In view of these successful advances, it becomes important to explore new ab initio approaches to reaction calculations based on the no-core shell model (NCSM) [42][43][44] in addition to those already developed, such as the NCSM/RGM approach combining the NCSM with the resonating group method [45][46][47][48], and the NCSM with continuum [49][50][51][52][53][54][55][56][57]. There is also the SS-HORSE-NCSM approach [58][59][60][61][62][63] that extends the NCSM for studying resonances.…”

Section: Introductionmentioning

confidence: 99%

Calculations of the np→dγ reaction in chiral effective field theory

Pal

Sharaf

et al. 2022

Phys. Rev. C

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We present a calculation of the radiative capture cross section p(n, γ)d in the low-energy range, where the M 1 reaction channel dominates. Employing the LENPIC nucleon-nucleon interaction up to the fifth order (N4LO) that is regularized by the semi-local coordinate space regulators, we obtain the initial and final state wave functions, and evaluate the phase shifts of the scattering state and deuteron properties. We derive the transition operator from the chiral effective field theory up to the next-to-next-to leading order (N2LO), where we also regularize the transition operator using regulators consistent with those of the interactions. We compute the capture cross sections and the results show a converging pattern with the chiral-order expansion of the nucleon-nucleon interaction, where the regulator dependence of the results is weak when higher-order nucleon-nucleon interactions are employed. We quantify the uncertainties of the cross-section results due to the chiralorder truncation. The chirally complete and consistent cross-section results are performed up to N2LO and they compare well with the experiments and other theoretical predictions.

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Ab initio calculations of reactions with light nuclei

Cited by 4 publications

References 46 publications

Electric dipole polarizability from first principles calculations

Electric dipole polarizability from first principles calculations

Unified ab initio approaches to nuclear structure and reactions

Calculations of the np→dγ reaction in chiral effective field theory

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