Quantum Monte Carlo calculations of two neutrons in finite volume

Klos, P.; Lynn, J. E.; Tews, I.; Gandolfi, Stefano; Gezerlis, A.; Hammer, H. -W.; Hoferichter, M.; Schwenk, A.

doi:10.1103/PhysRevC.94.054005

Title: Quantum Monte Carlo calculations of two neutrons in finite volume

Journal Article · Fri Nov 18 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.94.054005· OSTI ID:1338806

Klos, P. ^[1]; Lynn, J. E. ^[1]; Tews, I. ^[2]; Gandolfi, Stefano ^[3]; Gezerlis, A. ^[4]; Hammer, H. -W. ^[1]; Hoferichter, M. ^[2]; Schwenk, A. ^[1]

Technische Univ. Darmstadt, Darmstadt (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
Univ. of Washington, Seattle, WA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Guelph, Guelph, ON (Canada)

Ab initio calculations provide direct access to the properties of pure neutron systems that are challenging to study experimentally. In addition to their importance for fundamental physics, their properties are required as input for effective field theories of the strong interaction. In this work, we perform auxiliary-field diffusion Monte Carlo calculations of the ground state and first excited state of two neutrons in a finite box, considering a simple contact potential as well as chiral effective field theory interactions. We compare the results against exact diagonalizations and present a detailed analysis of the finite-volume effects, whose understanding is crucial for determining observables from the calculated energies. Finally, using the Lüscher formula, we extract the low-energy S-wave scattering parameters from ground- and excited-state energies for different box sizes.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26); USDOE

Grant/Contract Number:: AC52-06NA25396; FG02-00ER41132; AC02-05CH11231

OSTI ID:: 1338806

Alternate ID(s):: OSTI ID: 1332786

Report Number(s):: LA-UR-16-22057; PRVCAN; TRN: US1701236

Journal Information:: Physical Review C, Vol. 94, Issue 5; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Signatures of few-body resonances in finite volume Klos, P.; König, S.; Hammer, H. -W. arXiv https://doi.org/10.48550/arxiv.1805.02029	text	January 2018

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