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
| Autor: | J. Pino, G. M. Hale, R. D. Petrasso, Sofia Quaglioni, R. Janezic, O. Landoas, M. Gatu Johnson, Ian J. Thompson, Daniel Sayre, D. P. McNabb, V. Yu. Glebov, J.-L. Bourgade, Johan Frenje, A. D. Bacher, Yong Ho Kim, Christian Stoeckl, Hong Sio, Hans W. Herrmann, Daniel Casey, B. Rosse, J. A. Caggiano, Alex Zylstra, T. C. Sangster, J. P. Knauer, Chad Forrest, J. J. Sanchez, W. T. Shmayda, Mark W. Paris, Carl R. Brune, Robert Hatarik |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Range (particle radiation) Reaction mechanism 010308 nuclear & particles physics General Physics and Astronomy 01 natural sciences 7. Clean energy Omega Ion 0103 physical sciences Neutron Center of mass Atomic physics Nuclear Experiment 010306 general physics Ground state Inertial confinement fusion |
| Zdroj: | Physical Review Letters. 121 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.121.042501 |
| Popis: | 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 ^{5}He 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. This finding provides an important experimental constraint on theoretical efforts that explore this and complementary six-nucleon systems, such as the solar ^{3}He(^{3}He,2p)α reaction. |
| Databáze: | OpenAIRE |
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