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Title: Ab initio calculation of the $$np \to d ³$$ radiative capture process

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [3];  [4];  [1];  [5]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Univ. of Barcelona, Barcelona (Spain)
  5. The City College of New York, New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

In this study, lattice QCD calculations of two-nucleon systems are used to isolate the short-distance two-body electromagnetic contributions to the radiative capture process $$np \to d\gamma$$, and the photo-disintegration processes $$\gamma^{(\ast)} d \to np$$. 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 $$m_\pi \sim 450$$ and 806 MeV, and are combined with pionless nuclear effective field theory to determine these low-energy 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 $$\sigma^{expt}(np \to d\gamma) = 334.2(0.5)\ mb$$.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
DOE Office of Science; USDOE
Contributing Organization:
NPLQCD Collaboration
Grant/Contract Number:
AC02-05CH11231; FG02-04ER41302; FG02-00ER41132; AC05-00OR22725; SC0010495; AC05-06OR23177
OSTI ID:
1221536
Alternate ID(s):
OSTI ID: 1224626
Report Number(s):
JLAB-THY--15-2045; DOE/OR/23177--3346; arXiv:1505.02422
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 115; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Spectra and scattering of light lattice nuclei from effective field theory journal November 2015
From effective field theories to effective density functionals in and beyond the mean field journal May 2016
Two nucleon systems at m π ∼ 450     MeV from lattice QCD journal December 2015
Challenges in nuclear structure theory journal March 2016
Sanity check for NN bound states in lattice QCD with Lüscher’s finite volume formula – Disclosing Symptoms of Fake Plateaux – journal January 2018
Possible pentaquarks with heavy quarks journal November 2016
Ab initio alpha–alpha scattering journal December 2015
Possible pentaquarks with heavy quarks text January 2015
Hadrons and nuclei journal November 2019
Octet baryon magnetic moments from lattice QCD: Approaching experiment from a three-flavor symmetric point journal June 2017
Renormalized approach to neutrinoless double- β decay journal November 2019

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