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@ARTICLE{Griehammer:889272,
      author       = {Grießhammer, Harald W. and McGovern, Judith A. and Nogga,
                      Andreas and Phillips, Daniel R.},
      title        = {{S}cattering {O}bservables from {O}ne- and {T}wo-body
                      {D}ensities: {F}ormalism and {A}pplication to $$\pmb \gamma
                      $$ $${}^3\hbox {{H}e}$$ {S}cattering},
      journal      = {Few-body systems},
      volume       = {61},
      number       = {4},
      issn         = {1432-5411},
      address      = {Wien [u.a.]},
      publisher    = {Springer},
      reportid     = {FZJ-2021-00177},
      pages        = {48},
      year         = {2020},
      abstract     = {We introduce the transition-density formalism, an efficient
                      and general method for calculating the interaction of
                      external probes with light nuclei. One- and two-body
                      transition densities that encode the nuclear structure of
                      the target are evaluated once and stored. They are then
                      convoluted with an interaction kernel to produce amplitudes,
                      and hence observables. By choosing different kernels, the
                      same densities can be used for any reaction in which a probe
                      interacts perturbatively with the target. The method
                      therefore exploits the factorisation between nuclear
                      structure and interaction kernel that occurs in such
                      processes. We study in detail the convergence in the number
                      of partial waves for matrix elements relevant in elastic
                      Compton scattering on 3He. The results are fully consistent
                      with our previous calculations in Chiral Effective Field
                      Theory. But the new approach is markedly more
                      computationally efficient, which facilitates the inclusion
                      of more partial-wave channels in the calculation. We also
                      discuss the usefulness of the transition-density method for
                      other nuclei and reactions. Calculations of elastic Compton
                      scattering on heavier targets like 4He are straightforward
                      extensions of this study, since the same interaction kernels
                      are used. And the generality of the formalism means that our
                      3He densities can be used to evaluate any
                      3Heelastic-scattering observable with contributions from
                      one- and two-body operators. They are available at
                      https://datapub.fz-juelich.de/anogga.},
      cin          = {IAS-4 / IKP-3 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104 /
                      $I:(DE-82)080012_20140620$},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
                      Strukturbildung in der Quantenchromodynamik (196253076) /
                      Chiral dynamics in Few-Baryon Systems $(jikp03_20190501)$},
      pid          = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076 /
                      $G:(DE-Juel1)jikp03_20190501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000595120400001},
      doi          = {10.1007/s00601-020-01578-w},
      url          = {https://juser.fz-juelich.de/record/889272},
}