The axial exchange charge operator and the nucleon-nucleon interaction

Kirchbach, Mariana; Riska, D. O.; Tsushima, K.

doi:10.1016/0375-9474(92)90260-q

Cited by 67 publications

(82 citation statements)

References 20 publications

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“…A subsequent explicit calculation of the nuclear enhancement of the axial charge based on meson exchange indicated that pion-exchange mechanisms yield enhancements of the order 45-60%. In combination with short range mechanisms the total enhancement in heavy nuclei is of the order 85-100%, depending on the interaction model [45,46]. This is sufficient to explain almost all of the empirically observed ∼ 100% enhancement of first forbidden β-decay transitions in the lead region [47].…”

Section: The Axial Charge Operatormentioning

confidence: 81%

Chiral electroweak currents in nuclei

Riska

Schiavilla

2017

Int. J. Mod. Phys. E

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Section: The Axial Charge Operatormentioning

confidence: 81%

Chiral electroweak currents in nuclei

Riska

Schiavilla

2017

Int. J. Mod. Phys. E

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“…The latter are obtained consistently with the two-nucleon interaction model, following a procedure [59] similar to that used to derive the corresponding weak vector-current operators [21]. The two-body axial charge operator due to N -to-∆-transition has also been included [21,34], although its contribution is found to be very small.…”

Section: Weak Transition Operatormentioning

confidence: 99%

Muon capture on deuteron andHe3

et al. 2011

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The muon capture reactions 2 H(µ − , νµ)nn and 3 He(µ − , νµ) 3 H are studied with conventional or chiral realistic potentials and consistent weak currents. The initial and final A = 2 and 3 nuclear wave functions are obtained from the Argonne v18 or chiral N3LO two-nucleon potential, in combination with, respectively, the Urbana IX or chiral N2LO three-nucleon potential in the case of A = 3. The weak current consists of polar-and axial-vector components. The former are related to the isovector piece of the electromagnetic current via the conserved-vector-current hypothesis. These and the axial currents are derived either in a meson-exchange or in a chiral effective field theory (χEFT) framework. There is one parameter (either the N -to-∆ axial coupling constant in the meson-exchange model, or the strength of a contact term in the χEFT model) which is fixed by reproducing the Gamow-Teller matrix element in tritium β-decay. The model dependence relative to the adopted interactions and currents (and cutoff sensitivity in the χEFT currents) is weak, resulting in total rates of 392.0 ± 2.3 s −1 for A = 2, and 1484 ± 13 s −1 for A = 3, where the spread accounts for this model dependence.

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“…where A The i=1,2 components of the axial charge operator are known to have significant twonucleon components, which are implied by the nucleon-nucleon interaction [22,23]. These…”

Section: A the Single Nucleon Amplitudementioning

confidence: 99%

The reaction pp→ppη and the eta–nucleon and nucleon–nucleon interactions

Peña

Garcilazo²,

Riska

2001

Nuclear Physics A

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The π, η and ρ exchange contributions to the cross-section for the reaction pp → ppη near threshold are calculated, with a phenomenological description of the intermediate S11 (N(1535)) resonance for all exchange mechanisms. The final state interaction in the pp system is described by realistic nucleon-nucleon interaction models. The sensitivity of the results to the phenomenological models for the η-nucleon transition amplitude and the nucleon-nucleon interaction is explored. The η exchange mechanism is found to play a dominant role. The off-shell behavior of the ηN → ηN amplitude within the η−exchange amplitude leads to a result significantly different from that obtained with the constant scattering length approximation. The twonucleon amplitudes that are associated with the short range components of the nucleon-nucleon interaction contribute significantly to the cross section.

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The axial exchange charge operator and the nucleon-nucleon interaction

Cited by 67 publications

References 20 publications

Chiral electroweak currents in nuclei

Chiral electroweak currents in nuclei

Muon capture on deuteron andHe3

The reaction pp→ppη and the eta–nucleon and nucleon–nucleon interactions

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