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Δ isobars and nucle...
Δ isobars and nuclear saturation
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- Ekström, Andreas, 1980 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hagen, G. (författare)
- Oak Ridge National Laboratory,University of Tennessee
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- Morris, T. D. (författare)
- Oak Ridge National Laboratory,University of Tennessee
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- Papenbrock, T. (författare)
- Oak Ridge National Laboratory,University of Tennessee
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- Schwartz, P. D. (författare)
- University of Tennessee,Oak Ridge National Laboratory
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(creator_code:org_t)
- 2018
- 2018
- Engelska.
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Ingår i: Physical Review C. - 2469-9985 .- 2469-9993. ; 97:2
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We construct a nuclear interaction in chiral effective field theory with explicit inclusion of the Δ-isobar Δ(1232) degree of freedom at all orders up to next-to-next-to-leading order (NNLO). We use pion-nucleon (πN) low-energy constants (LECs) from a Roy-Steiner analysis of πN scattering data, optimize the LECs in the contact potentials up to NNLO to reproduce low-energy nucleon-nucleon scattering phase shifts, and constrain the three-nucleon interaction at NNLO to reproduce the binding energy and point-proton radius of He4. For heavier nuclei we use the coupled-cluster method to compute binding energies, radii, and neutron skins. We find that radii and binding energies are much improved for interactions with explicit inclusion of Δ(1232), while Δ-less interactions produce nuclei that are not bound with respect to breakup into α particles. The saturation of nuclear matter is significantly improved, and its symmetry energy is consistent with empirical estimates.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
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- ref (ämneskategori)
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