Prospects for Using High Neutron Fluxes in Igniting Capsules to Probe the Contributions of Excited Nuclear State Reactions to R, P, and S Process Nucleosynthesis

Details Prospects for Using High Neutron Fluxes in Igniting Capsules to Probe the Contributions of Excited Nuclear State Reactions to R, P, and S Process Nucleosynthesis Prospects for Using High Neutron Fluxes in Igniting Capsules to Probe the Contributions of Excited Nuclear State Reactions to R, P, and S Process Nucleosynthesis

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dpplo1006l&link_type=abstract

American Physical Society, 43rd Annual Meeting of the APS Division of Plasma Physics October 29 - November 2, 2001 Long Beach, C

Physics

Plasma Physics

Scientific paper

The standard capsule design^1 for the National Ignition Facility offers the possibility of producing neutron fluxes that are high enough to explore a variety of multiple-step nuclear reactions that are relevant to astrophysical nucleosynthesis.^2 Calculations show that target nuclei seeded between the ablator and ice would see a neutron flux high enough to drive 10-20% into excited states via (n, n) reactions. Multiple-step reactions, including branches that pass through excited states with t > 1 ps can be studied using radiochemistry.^3 The 14 MeV neutrons due to the major D+T>α + n burn reaction drive the (n, n) excitations and (n, 2n) nuclear kinetics, while the ~ 2% minority D + D 3He + n, or T + p can drive (n,γ ) or (p, γ ) reactions. Radiochemistry measurements of noble gas end species can be made with very high efficiency with only ~ 10^4 atoms required. Solid collection systems are being developed as well (with 10^7-8 atoms required at present). Spatially, temporally, and spectrally resolved x-ray emission as well neutron time-of-flight measurements offer the promise of constraining the distribution of doped nuclei and the temperature and therefore local rate of the thermonuclear burn. It should also be noted that the class of experiments proposed here involving short-lived intermediate states are complementary to those naturally studied at the proposed Rare Isotope Accelerator which is suited to probing reactions on states with much longer half lives. 1. Haan, S. W. et. al., Physics of Plasmas, 2 (6), 2480, part 2, 1995 2. Hoffman, R.D. et.al., Astrophysical Journal, 521 (2), 735, part 1, 1999. 3. Stoyer, M..A. et. al., in the 42nd Annual Meeting of the Division of Plasma Physics Meeting, Quebec City, Canada, October 23-27, 2000 *The work at LLNL was performed under the auspices of the U. S. Department of Energy by the University of California Lawrence Livermore National Laboratory under Contract No. W-7405-ENG-48.

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