Experimental evidence of a variant neutron spectrum from the T(T,2n)alpha reaction at center-of-mass energies in the range of 16-50 keV

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Experimental evidence of a variant neutron spectrum from the T(T,2n)alpha reaction at center-of-mass energies in the range of 16-50 keV
M. Gatu Johnson, C.J. Forrest, D.B. Sayre, A. Bacher, J.-L. Bourgade, C.R. Brune, J.A. Caggiano, D.T. Casey, J.A. Frenje, V.Yu. Glebov, G.M. Hale, R. Hatarik, H.W. Herrmann, R. Janezic, Y.H. Kim, J.P. Knauer, O. Landoas, D.P. McNabb, M.W. Paris, R.D. Petrasso, J.E. Pino, S. Quaglioni, B. Rosse, J. Sanchez, T.C. Sangster, H. Sio, W. Shmayda, C. Stoeckl, I. Thompson, A.B. Zylstra, 2018, "Experimental evidence of a variant neutron spectrum from the T(T,2n)alpha reaction at center-of-mass energies in the range of 16-50 keV", https://doi.org/10.7910/DVN/9I3YZU, Harvard Dataverse, V1, UNF:6:lkk8I70jSK8juzp9CSl3mg== [fileUNF]
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Description
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)alpha (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 (Ec.m.) from 16 to 50 keV. A clear difference in the shape of the TT-neutron spectrum is observed between the two Ec.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 provides the first conclusive evidence of a variant TT-neutron spectrum in this Ec.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. 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)alpha reaction.
Subject Physics
Keyword direct drive, inertial confinement fusion, neutron spectrometry, nuclear reactions, omega laser laboratory for laser energetics
Notes PSFC REPORT PSFC/JA-18-21

This material is based upon work supported by the Department of Energy, National Nuclear Security Administration under Award Numbers DE-NA0001857, DE-NA0002949 and DE-NA0002905, and Office of Science under Award Number DE-FG02-88ER40387. The work was also supported in part by NLUF (DE-NA0002035) and LLE (415935-G). This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
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