|
1
|
Gatu Johnson M, Forrest CJ, Sayre DB, Bacher A, Bourgade JL, Brune CR, Caggiano JA, Casey DT, Frenje JA, Glebov VY, Hale GM, Hatarik R, Herrmann HW, Janezic R, Kim YH, Knauer JP, Landoas O, McNabb DP, Paris MW, Petrasso RD, Pino JE, Quaglioni S, Rosse B, Sanchez J, Sangster TC, Sio H, Shmayda W, Stoeckl C, Thompson I, Zylstra AB. 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. Phys Rev Lett 2018; 121:042501. [PMID: 30095940 DOI: 10.1103/physrevlett.121.042501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 03/20/2018] [Indexed: 06/08/2023]
Abstract
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.
Collapse
Affiliation(s)
- M Gatu Johnson
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - C J Forrest
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - D B Sayre
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Bacher
- Indiana University, Bloomington, Indiana 47405, USA
| | | | - C R Brune
- Ohio University, Athens, Ohio 45701, USA
| | - J A Caggiano
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D T Casey
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J A Frenje
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - V Yu Glebov
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - G M Hale
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - R Hatarik
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H W Herrmann
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - R Janezic
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - Y H Kim
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - J P Knauer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - O Landoas
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - D P McNabb
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M W Paris
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - R D Petrasso
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - J E Pino
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Quaglioni
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Rosse
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - J Sanchez
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T C Sangster
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - H Sio
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - W Shmayda
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - I Thompson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A B Zylstra
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| |
Collapse
|