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

Johnson, M. Gatu; Forrest, C. J.; Sayre, D. B.; Bacher, A.; Bourgade, J.-L.; Brune, C. R.; Caggiano, J. A.; Casey, D. T.; Frenje, J. A.; Glebov, V. Yu.; Hale, Gerald M.; Hatarik, R.; Herrmann, Hans W.; Janezic, R.; Kim, Yong Ho; Knauer, J. P.; Landoas, O.; McNabb, D. P.; Paris, Mark W.; Petrasso, R. D.; Pino, J. E.; Quaglioni, S.; Rosse, B.; Sanchez, J.; Sangster, T. C.; Sio, H.; Shmayda, W.; Stoeckl, C.; Thompson, I.; Zylstra, Alex B.

doi:10.1103/PhysRevLett.121.042501

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

Journal Article · Fri Jul 27 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.042501· OSTI ID:1462997

Johnson, M. Gatu ^[1]; Forrest, C. J. ^[2]; Sayre, D. B. ^[3]; Bacher, A. ^[4]; Bourgade, J.-L. ^[5]; Brune, C. R. ^[6]; Caggiano, J. A. ^[3]; Casey, D. T. ^[3]; Frenje, J. A. ^[1]; Glebov, V. Yu. ^[2]; Hale, Gerald M. ^[7]; Hatarik, R. ^[3];

^[7]; Janezic, R. ^[2];

^[7]; Knauer, J. P. ^[2]; Landoas, O. ^[5]; McNabb, D. P. ^[3];

^[7]; Petrasso, R. D. ^[1] more »

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Rochester, Rochester, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Indiana Univ., Bloomington, IN (United States)
CEA, DAM, DIF, Arpajon (France)
Ohio Univ., Athens, OH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: NA0002949; NA0001857; NA0002905; FG02-88ER40387; NA0002035; AC52-07NA27344; 89233218CNA000001

OSTI ID:: 1462997

Alternate ID(s):: OSTI ID: 1461909; OSTI ID: 1481074; OSTI ID: 1688751

Report Number(s):: LA-UR-19-30933; LLNL-JRNL-756028; PRLTAO

Journal Information:: Physical Review Letters, Vol. 121, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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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

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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