4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Change in the Angular Momentum Distribution due to Nuclear Plasma Interactions

Presented by Mr. Thembalethu NOGWANYA on 6 Jul 2016 from 11:50 to 12:10
Type: Oral Presentation
Track: Track B - Nuclear, Particle and Radiation Physics

Abstract

Electron-mediated nuclear plasma interactions (NPIs), such as Nuclear Excitation by Electron Capture (NEEC) or Transition (NEET), can have significant impact on nuclear cross sections in High Energy Density Plasmas (HEDPs). These HEDP environments are found in National Ignition Facility’s shots and in the cosmos where nucleosynthesis takes place. Attempts have failed so far in measuring the NEEC process [1, 2], while NEET has recently been observed experimentally [3, 4]. Further, NPIs have not been observed due to the narrowness of nuclear transitions (Γ≤1 μeV) . The NPIs will occur on highly excited nuclear states in the quasi-continuum which is populated in nuclear reactions prior to their decay by spontaneous γγ-ray emission. Direct observation of NPIs are hindered by the lack of a clear signature of the effect in HEDP environments. Hence, a new signature [5] for NPIs on highly excited nuclei will be tested by investigating isomeric to ground state feeding from the quasi-continuum region. An experiment was performed using the reactions 197Au(13C,12C)198Au and 197Au( 13C,12C 2n )196Au at Lawrence Berkeley National Laboratory in inverse kinematics with a 197Au beam of 8.5 MeV/u energy. Several measurements were performed with different target configurations. The activated foils were counted at the low-background counting facility of Lawrence Livermore National Laboratory. In this talk I will present theoretical concepts, experimental details and preliminary results. Reference [1] Y. Izawa and C. Yamanaka , Phys. Lett. B 88 , 59 (1979) [2] P. Morel et al., Nucl. Phys. A 746, 608c (2004) [3] S. Kishimoto et al., Phys. Lett. 85 , 1831 (2000) [4] T. Carreyre et al., Phys. Rev. C 62 024311 (2000) [5] D. L. Bleuel et al., Plasma and Fusion Research (in publication)

Award

Yes

Level

MSc

Supervisor

Dr Mathis Wiedeking , wiedeking@tlabs.ac.za

Paper

No

Permission

Yes

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room: LT3


Primary authors

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Co-authors

  • K. MOODY Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
  • Prof. J.N. ORCE University of the Western Cape, Cape Town
  • D.L. BLEUEL Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
  • L.A. BERNSTEIN Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
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