Ab initio calculation of the $$np \to d ³$$ radiative capture process
Abstract
In this study, lattice QCD calculations of twonucleon systems are used to isolate the shortdistance twobody electromagnetic contributions to the radiative capture process $$np \to d\gamma$$, and the photodisintegration processes $$\gamma^{(\ast)} d \to np$$. In nuclear potential models, such contributions are described by phenomenological mesonexchange currents, while in the present work, they are determined directly from the quark and gluon interactions of QCD. Calculations of neutronproton energy levels in multiple background magnetic fields are performed at two values of the quark masses, corresponding to pion masses of $$m_\pi \sim 450$$ and 806 MeV, and are combined with pionless nuclear effective field theory to determine these lowenergy inelastic processes. Extrapolating to the physical pion mass, a cross section of $$\sigma^{lqcd}(np\to d\gamma)=332.4({\tiny \begin{array}{l}+5.4 \\  4.7\end{array}})\ mb$$ is obtained at an incident neutron speed of $$v=2,200\ m/s$$, consistent with the experimental value of $$\sigma^{expt}(np \to d\gamma) = 334.2(0.5)\ mb$$.
 Authors:

 Univ. of Washington, Seattle, WA (United States)
 Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
 Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
 Univ. of Barcelona, Barcelona (Spain)
 The City College of New York, New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
 Publication Date:
 Research Org.:
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC)
 Contributing Org.:
 NPLQCD Collaboration
 OSTI Identifier:
 1221536
 Alternate Identifier(s):
 OSTI ID: 1224626
 Report Number(s):
 JLABTHY152045; DOE/OR/231773346; arXiv:1505.02422
Journal ID: ISSN 00319007; PRLTAO
 Grant/Contract Number:
 OCI1053575; PHY1206498; PHY1205778; AC0205CH11231; DOE DESC0013477; SC0010337ER42045; FG0204ER41302; FG0200ER41132; AC0500OR22725; SC0010495; AC0506OR23177
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review Letters
 Additional Journal Information:
 Journal Volume: 115; Journal Issue: 13; Journal ID: ISSN 00319007
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Beane, Silas R., Chang, Emmanuel, Detmold, William, Orginos, Kostas, Parreño, Assumpta, Savage, Martin J., and Tiburzi, Brian C. Ab initio calculation of the $np \to d ³$ radiative capture process. United States: N. p., 2015.
Web. doi:10.1103/PhysRevLett.115.132001.
Beane, Silas R., Chang, Emmanuel, Detmold, William, Orginos, Kostas, Parreño, Assumpta, Savage, Martin J., & Tiburzi, Brian C. Ab initio calculation of the $np \to d ³$ radiative capture process. United States. https://doi.org/10.1103/PhysRevLett.115.132001
Beane, Silas R., Chang, Emmanuel, Detmold, William, Orginos, Kostas, Parreño, Assumpta, Savage, Martin J., and Tiburzi, Brian C. Thu .
"Ab initio calculation of the $np \to d ³$ radiative capture process". United States. https://doi.org/10.1103/PhysRevLett.115.132001. https://www.osti.gov/servlets/purl/1221536.
@article{osti_1221536,
title = {Ab initio calculation of the $np \to d ³$ radiative capture process},
author = {Beane, Silas R. and Chang, Emmanuel and Detmold, William and Orginos, Kostas and Parreño, Assumpta and Savage, Martin J. and Tiburzi, Brian C.},
abstractNote = {In this study, lattice QCD calculations of twonucleon systems are used to isolate the shortdistance twobody electromagnetic contributions to the radiative capture process $np \to d\gamma$, and the photodisintegration processes $\gamma^{(\ast)} d \to np$. In nuclear potential models, such contributions are described by phenomenological mesonexchange currents, while in the present work, they are determined directly from the quark and gluon interactions of QCD. Calculations of neutronproton energy levels in multiple background magnetic fields are performed at two values of the quark masses, corresponding to pion masses of $m_\pi \sim 450$ and 806 MeV, and are combined with pionless nuclear effective field theory to determine these lowenergy inelastic processes. Extrapolating to the physical pion mass, a cross section of $\sigma^{lqcd}(np\to d\gamma)=332.4({\tiny \begin{array}{l}+5.4 \\  4.7\end{array}})\ mb$ is obtained at an incident neutron speed of $v=2,200\ m/s$, consistent with the experimental value of $\sigma^{expt}(np \to d\gamma) = 334.2(0.5)\ mb$.},
doi = {10.1103/PhysRevLett.115.132001},
journal = {Physical Review Letters},
number = 13,
volume = 115,
place = {United States},
year = {2015},
month = {9}
}
Web of Science
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