Operator evolution for ab initio electric dipole transitions of 4He

Schuster, Micah D.; Quaglioni, Sofia; Johnson, Calvin W.; Jurgenson, Eric D.; Navartil, Petr

doi:10.1103/PhysRevC.92.014320

Title: Operator evolution for ab initio electric dipole transitions of⁴He

Journal Article · Fri Jul 24 00:00:00 EDT 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.014320· OSTI ID:1249145

Schuster, Micah D. ^[1]; Quaglioni, Sofia ^[2]; Johnson, Calvin W. ^[1]; Jurgenson, Eric D. ^[2]; Navartil, Petr ^[3]

San Diego State Univ., San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
TRIUMF, Vancouver, BC (Canada)

A goal of nuclear theory is to make quantitative predictions of low-energy nuclear observables starting from accurate microscopic internucleon forces. A major element of such an effort is applying unitary transformations to soften the nuclear Hamiltonian and hence accelerate the convergence of ab initio calculations as a function of the model space size. The consistent simultaneous transformation of external operators, however, has been overlooked in applications of the theory, particularly for nonscalar transitions. We study the evolution of the electric dipole operator in the framework of the similarity renormalization group method and apply the renormalized matrix elements to the calculation of the ⁴He total photoabsorption cross section and electric dipole polarizability. All observables are calculated within the ab initio no-core shell model. Furthermore, we find that, although seemingly small, the effects of evolved operators on the photoabsorption cross section are comparable in magnitude to the correction produced by including the chiral three-nucleon force and cannot be neglected.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; FG02-96ER40985; FC02-07ER41457; SCW1158

OSTI ID:: 1249145

Alternate ID(s):: OSTI ID: 1201029

Report Number(s):: LLNL-JRNL-668055; PRVCAN

Journal Information:: Physical Review C, Nuclear Physics, Vol. 92, Issue 1; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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