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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 [First 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]

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [3] ;  [3] ;  [1] ;  [2] ;  [7] ;  [3] ;  [7] ;  [2] ;  [7] ;  [2] ;  [5] ;  [3] ;  [7] ;  [1] more »;  [3] ;  [3] ;  [5] ;  [3] ;  [2] ;  [1] ;  [2] ;  [2] ;  [3] ;  [7] « less
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Indiana Univ., Bloomington, IN (United States)
  5. CEA, DAM, DIF, Arpajon (France)
  6. Ohio Univ., Athens, OH (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-756028
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
NA0002949; NA0001857; NA0002905; FG02-88ER40387; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 4; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; Nuclear science and engineering, Physics - Plasma physics , Physics - Nuclear physics and radiation physics
OSTI Identifier:
1462997
Alternate Identifier(s):
OSTI ID: 1461909; OSTI ID: 1481074

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, G. M., Hatarik, R., Herrmann, H. W., Janezic, R., Kim, Y. H., Knauer, J. P., Landoas, O., McNabb, D. P., Paris, M. W., Petrasso, R. D., Pino, J. E., Quaglioni, S., Rosse, B., Sanchez, J., Sangster, T. C., Sio, H., Shmayda, W., Stoeckl, C., Thompson, I., and Zylstra, A. B.. 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 [First 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]. United States: N. p., Web. doi:10.1103/PhysRevLett.121.042501.
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, G. M., Hatarik, R., Herrmann, H. W., Janezic, R., Kim, Y. H., Knauer, J. P., Landoas, O., McNabb, D. P., Paris, M. 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, A. B.. 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 [First 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]. United States. doi:10.1103/PhysRevLett.121.042501.
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, G. M., Hatarik, R., Herrmann, H. W., Janezic, R., Kim, Y. H., Knauer, J. P., Landoas, O., McNabb, D. P., Paris, M. W., Petrasso, R. D., Pino, J. E., Quaglioni, S., Rosse, B., Sanchez, J., Sangster, T. C., Sio, H., Shmayda, W., Stoeckl, C., Thompson, I., and Zylstra, A. B.. 2018. "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 [First 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]". United States. doi:10.1103/PhysRevLett.121.042501.
@article{osti_1462997,
title = {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 [First 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]},
author = {Johnson, M. Gatu and Forrest, C. J. and Sayre, D. B. and Bacher, A. and Bourgade, J. -L. and Brune, C. R. and Caggiano, J. A. and Casey, D. T. and Frenje, J. A. and Glebov, V. Yu. and Hale, G. M. and Hatarik, R. and Herrmann, H. W. and Janezic, R. and Kim, Y. H. and Knauer, J. P. and Landoas, O. and McNabb, D. P. and Paris, M. W. and Petrasso, R. D. and Pino, J. E. and Quaglioni, S. and Rosse, B. and Sanchez, J. and Sangster, T. C. and Sio, H. and Shmayda, W. and Stoeckl, C. and Thompson, I. and Zylstra, A. B.},
abstractNote = {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 (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 provide 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. 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.},
doi = {10.1103/PhysRevLett.121.042501},
journal = {Physical Review Letters},
number = 4,
volume = 121,
place = {United States},
year = {2018},
month = {7}
}