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Ellerkmann, G.; Sandhas, W.; Sofianos, S. A.; Fiedeldey, H.

doi:10.1103/physrevc.53.2638

Cited by 27 publications

(46 citation statements)

References 35 publications

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“…In Refs. [6,7,8] it has been shown that such models lead to pronounced peak cross sections, in rather good agreement with the experimental data of [1] and much different from what was calculated earlier [9].…”

supporting

confidence: 72%

Photoabsorption onHe4with a Realistic Nuclear Force

et al. 2006

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supporting

confidence: 72%

Photoabsorption onHe4with a Realistic Nuclear Force

et al. 2006

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“…Of particular controversy is the height of the cross section at the peak, alternatively found to be either pronounced or suppressed with differences up to a factor of 2 between different experimental data. With the exception of [17], early evaluations of the 4 He photo-disintegration [18,19,14] showed better agreement with the high-peaked experiments, and, ultimately, with those of Ref. [16].…”

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confidence: 50%

The 4He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory

Quaglioni

Navrátil

2007

Physics Letters B

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The total photo-absorption cross section of 4 He is evaluated microscopically using two-(NN) and three-nucleon (NNN) interactions based upon chiral effective field theory (χEFT). The calculation is performed using the Lorentz integral transform method along with the ab initio no-core shell model approach. An important feature of the present study is the consistency of the NN and NNN interactions and also, through the Siegert theorem, of the two-and three-body current operators. This is due to the application of the χEFT framework. The inclusion of the NNN interaction produces a suppression of the low-energy peak and enhancement of the high-energy tail of the cross section. We compare to calculations obtained using other interactions and to representative experiments. The rather confused experimental situation in the giant resonance region prevents discrimination among different interaction models.Key words: PACS: 25.20.Dc, 21.60.Cs, 27.10.+h Interactions among nucleons are governed by quantum chromodynamics (QCD). In the low-energy regime relevant to nuclear structure and reactions, this theory is nonperturbative, and, therefore, hard to solve. Thus, theory has been forced to resort to models for the interaction, which have limited physical basis. New theoretical developments, however, allow us to connect QCD with low-energy nuclear physics. Chiral effective field theory (χEFT) [1,2] provides a promising bridge to the underlying theory, QCD. Beginning with the pionic or the nucleon-pion system [3] one works consistently with systems of increasing number of nucleons [4]. One makes use of spontaneous breaking of chiral symmetry to systematically expand the strong interaction in terms of a generic small momentum and takes the explicit breaking of chiral symmetry into account by expanding in the pion mass. Nuclear interactions are nonperturbative, because diagrams with purely nucleonic intermediate states are enhanced [1,2]. Therefore, the chiral perturbation expansion is performed for the potential. The χEFT predicts, along with the nucleon-nucleon (NN) interaction at the leading order, a three-nucleon (NNN) interaction at the next-to-next-to-leading order or N 2 LO [2,5,6], and even a four-nucleon (NNNN) interaction at the fourth Email addresses: quaglioni1@llnl.gov (Sofia Quaglioni), navratil1@llnl.gov (Petr Navrátil). order (N 3 LO) [7]. The details of QCD dynamics are contained in parameters, low-energy constants (LECs), not fixed by the symmetry, but can be constrained by experiment. At present, high-quality NN potentials have been determined at N 3 LO [8]. A crucial feature of χEFT is the consistency between the NN, NNN and NNNN parts. As a consequence, at N 2 LO and N 3 LO, except for two parameters assigned to two NNN diagrams, the potential is fully constrained by the parameters defining the NN interaction. The full interaction up to N 2 LO was first applied to the analysis of nd scattering [6] and later the N 3 LO NN potential was combined with the available NNN at N 2 LO to study the 7 Li stru...

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“…For the AV18/UIX potential model we have realized that the sum of the CSs σ n, 3 He + σ p, 3 H of the reactions 4 He(γ, p) 3 H and 4 He(γ, n) 3 He does not reproduce the inclusive CS. This discrepancy is the result of neglecting the 3NF in the source term of the exclusive LIT equation (6). We intend to explore this point including also the 3NF in the source term.…”

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confidence: 99%

“…In the low-energy regime, the total cross section of the two-body breakup reactions is well-described by the unretarded dipole approximation (UDA) [6,7]. Therefore meson-exchange currents can be included implicitly using Siegert's theorem.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study of the 4He(γ, p)3H and 4He(γ, n)3He Reactions

2013

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Ab initio calculation of the total cross section for the reactions 4 He(γ, p) 3 H and 4 He(γ, n) 3 He is presented, using state-of-the-art nuclear forces. The Lorentz integral transform (LIT) method is applied, which allows exact treatment of the final state interaction (FSI). The dynamic equations are solved using the effective interaction hyperspherical harmonics (EIHH) method. In this calculation of the cross sections the three-nucleon force is fully taken into account, except in the source term of the LIT equation for the FSI transition matrix element.

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Integral equation calculations for the photodisintegration processHe4(γ, n)

Cited by 27 publications

References 35 publications

Photoabsorption onHe4with a Realistic Nuclear Force

Photoabsorption onHe4with a Realistic Nuclear Force

The 4He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory

Theoretical Study of the 4He(γ, p)3H and 4He(γ, n)3He Reactions

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