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Title: Experimental Evidence of a Variant Neutron Spectrum from the T ( t , 2 n ) α Reaction at Center-of-Mass Energies in the Range of 16–50 keV [First Experimental Evidence of a Variant Neutron Spectrum from the T ( t , 2 n ) α Reaction at Center-of-Mass Energies in the Range of 16–50 keV]

Full calculations of six-nucleon reactions with a three-body final state have been elusive and a long-standing issue. We present neutron spectra from the T(t,2n)α (TT) reaction measured in inertial confinement fusion experiments at the OMEGA laser facility at ion temperatures from 4 to 18 keV, corresponding to center-of-mass energies (E c.m.) from 16 to 50 keV. A clear difference in the shape of the TT-neutron spectrum is observed between the two E c.m., with the 5He ground state resonant peak at 8.6 MeV being significantly stronger at the higher than at the lower energy. The data provide the first conclusive evidence of a variant TT-neutron spectrum in this E c.m. range. In contrast to earlier available data, this indicates a reaction mechanism that must involve resonances and/or higher angular momenta than L = 0. Furthermore, this finding provides an important experimental constraint on theoretical efforts that explore this and complementary six-nucleon systems, such as the solar 3He( 3He,2p)α reaction.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [3] ;  [3] ;  [1] ;  [2] ;  [7] ;  [3] ;  [7] ;  [2] ;  [7] ;  [2] ;  [5] ;  [3] ;  [7] ;  [1] more »;  [3] ;  [3] ;  [5] ;  [3] ;  [2] ;  [1] ;  [2] ;  [2] ;  [3] ;  [7] « less
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Indiana Univ., Bloomington, IN (United States)
  5. CEA, DAM, DIF, Arpajon (France)
  6. Ohio Univ., Athens, OH (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
NA0002949; NA0001857; NA0002905; FG02-88ER40387
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 4; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1462997
Alternate Identifier(s):
OSTI ID: 1461909