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http://hdl.handle.net/2445/132862
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DC Field | Value | Language |
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dc.contributor.author | Beane, Silas R. | - |
dc.contributor.author | Chang, Emmanuel | - |
dc.contributor.author | Detmold, William | - |
dc.contributor.author | Orginos, Kostas | - |
dc.contributor.author | Parreño García, Assumpta | - |
dc.contributor.author | Savage, Martin J. | - |
dc.contributor.author | Tiburzi, Brian C. | - |
dc.contributor.author | NPLQCD Collaboration | - |
dc.date.accessioned | 2019-05-08T15:20:06Z | - |
dc.date.available | 2019-05-08T15:20:06Z | - |
dc.date.issued | 2015-09-24 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/2445/132862 | - |
dc.description.abstract | Lattice QCD calculations of two-nucleon systems are used to isolate the short-distance two-body electromagnetic contributions to the radiative capture process n p → d γ , and the photo-disintegration processes γ ( * ) d → n p . In nuclear potential models, such contributions are described by phenomenological meson-exchange currents, while in the present work, they are determined directly from the quark and gluon interactions of QCD. Calculations of neutron-proton energy levels in multiple background magnetic fields are performed at two values of the quark masses, corresponding to pion masses of m π ∼ 450 and 806 MeV, and are combined with pionless nuclear effective field theory to determine the amplitudes for these low-energy inelastic processes. At m π ∼ 806 MeV , using only lattice QCD inputs, a cross section σ 806 MeV ∼ 17 mb is found at an incident neutron speed of v = 2 , 200 m / s . Extrapolating the short-distance contribution to the physical pion mass and combining the result with phenomenological scattering information and one-body couplings, a cross section of σ lqcd ( n p → d γ ) = 334.9 ( + 5.2 − 5.4 ) mb is obtained at the same incident neutron speed, consistent with the experimental value of σ expt ( n p → d γ ) = 334.2 ( 0.5 ) mb . | - |
dc.format.extent | 6 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.115.132001 | - |
dc.relation.ispartof | Physical Review Letters, 2015, vol. 115, num. 13, p. 132001 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevLett.115.132001 | - |
dc.rights | (c) American Physical Society, 2015 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.title | Ab initio Calculation of the np→dγ Radiative Capture Process | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 657133 | - |
dc.date.updated | 2019-05-08T15:20:07Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
Files in This Item:
File | Description | Size | Format | |
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657133.pdf | 296.48 kB | Adobe PDF | View/Open |
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