title: Measurement of the T + T neutron spectrum using the national ignition facility.
abstract: Neutron time-of-flight spectra from inertial confinement fusion experiments with tritium-filled targets have been measured at the National Ignition Facility. These spectra represent a significant improvement in energy resolution and statistics over previous measurements, and afford the first definitive observation of a peak resulting from sequential decay through the ground state of (5)He at low reaction energies E(c.m.) 100 </~ keV. To describe the spectrum, we have developed an R-matrix model that accounts for interferences from fermion symmetry and intermediate states, and show these effects to be non-negligible. We also find the spectrum can be described by sequential decay through ℓ=1 states in (5)He, which differs from previous interpretations.
authors: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors: D B
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authors: Sayre
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authors: CR
authors: Brune
authors: J A
authors: JA
authors: Caggiano
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authors: Glebov
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authors: Hatarik
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authors: Nikroo
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authors: Phillips
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authors: Smalyuk
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authors: Stoeffl
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authors: Tipton
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authors: Weber
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authors: Yeamans