Relativistic Effects and the Role of Heavy-Meson Exchange in Deuteron Photodisintegration

Ritz, Frank; Arenhövel, H.; Wilbois, T.

doi:10.1007/s006010050082

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…It has been shown by Arenhövel and collaborators [52,54] in calculations with semiphenomenological NN forces that a more complete 2N current operator including in addition to the implicit MEC (incorporated in the Siegert approach) also other explicit 2N operators, isobar configurations and leading order relativistic corrections leads to a much better description of T 22 . Thus, the poor description of T 22 data in Fig.…”

Section: Results For Deuteron Photodisintegrationmentioning

confidence: 99%

Testing semilocal chiral two-nucleon interaction in selected electroweak processes

et al. 2016

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The recently developed semi-local improved chiral nucleon-nucleon interaction is used for the first time to study several electromagnetic and weak processes at energies below the pion production threshold. Cross sections and selected polarization observables for deuteron photodisintegration, nucleon-deuteron radiative capture, three-body 3 He photodisintegration as well as capture rates for decays of the muonic 2 H and 3 He atoms are calculated. The Lippmann-Schwinger and Faddeev equations in momentum space are solved to obtain nuclear states. The electromagnetic current operator is taken as a single nucleon current supplemented by many-body contributions induced via the Siegert theorem. For muon capture processes the nonrelativistic weak current together with the dominant relativistic corrections is used. Our results compare well with experimental data, demonstrating the same quality as is observed for the semi-phenomenological AV18 potential. Compared to the older version of the chiral potential with a nonlocal regularization, a much smaller cut-off dependence is found for the state-of-art chiral local interaction employed in this paper. Finally, estimates of errors due to the truncation of the chiral expansion are given. 25.10.+s, 21.30.Fe

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Section: Results For Deuteron Photodisintegrationmentioning

confidence: 99%

Testing semilocal chiral two-nucleon interaction in selected electroweak processes

et al. 2016

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“…Summarizing the various contributions to the nucleonic meson exchange currents, we include as retarded currents the π and γπρ/ω MEC, whereas of the heavier mesons only the ρ MEC will be retained in the static limit. All the other remaining σ, δ, ω, and η MECs are completely neglected in view of their negligible contributions found previously in [21]. Moreover, due to the use of Siegert operators [22] and the much larger mass of the heavy mesons, the role of the corresponding MEC is largely suppressed.…”

Section: The Nucleonic Meson Exchange Currentmentioning

confidence: 99%

The role of meson retardation in deuteron photodisintegration above pion threshold

Schwamb

Arenhövel

2001

Nuclear Physics A

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Photodisintegration of the deuteron above π threshold is studied in a coupled channel approach including N ∆ and πd channels with consideration of pion retardation in potentials and exchange currents. A much improved description of total and differential cross sections in the energy region between π threshold and 400-450 MeV is achieved. With respect to polarization observables, the description of the linear photon asymmetry and the proton polarization remains problematic.

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“…Recently, we had studied systematically for photo-and electrodisintegration of the deuteron the influence of relativistic contributions of leading order in a p/M -expansion [1,2]. In order to have a consistent framework of all one-and two-body current and boost contributions, we had chosen as interaction model the various Bonn OBEPQ versions [3,4].…”

Section: Introductionmentioning

confidence: 99%

Elastic electron deuteron scattering with consistent meson exchange and relativistic contributions of leading order

2000

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The influence of relativistic contributions to elastic electron deuteron scattering is studied systematically at low and intermediate momentum transfers (Q 2 ≤ 30 fm −2 ). In a (p/M )-expansion, all leading order relativistic π-exchange contributions consistent with the Bonn OBEPQ models are included. In addition, static heavy meson exchange currents including boost terms and lowest order ρπγ-currents are considered. Sizeable effects from the various relativistic two-body contributions, mainly from π-exchange, have been found in form factors, structure functions and the tensor polarization T20. Furthermore, static properties, viz. magnetic dipole and charge quadrupole moments and the mean square charge radius are evaluated.

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Relativistic Effects and the Role of Heavy-Meson Exchange in Deuteron Photodisintegration

Cited by 8 publications

References 12 publications

Testing semilocal chiral two-nucleon interaction in selected electroweak processes

Testing semilocal chiral two-nucleon interaction in selected electroweak processes

The role of meson retardation in deuteron photodisintegration above pion threshold

Elastic electron deuteron scattering with consistent meson exchange and relativistic contributions of leading order

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