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Pionic fusion: comparison of different spin/isospin channels

Pionic fusion: comparison of different spin/isospin channels. Study coherence of pion production, role of clustering correlations in the pionic fusion process, production mechanism: s, p-wave dynamics. Existing data and models. semi-phenomenological model:

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Pionic fusion: comparison of different spin/isospin channels

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  1. Pionic fusion: comparison of different spin/isospin channels • Study • coherence of pion • production, • role of clustering • correlations in the • pionic fusion process, • production mechanism: s, p-wave dynamics H.L. / KVI PAC Meeting

  2. Existing data and models semi-phenomenological model: 3-nucleon transfer by p-3He reaction, analytic expressions for transfer formfactors from HO wave functions L. Bimbot et al., PL B 114(82)311 H.L. / KVI PAC Meeting

  3. Interacting cluster model Kajino, Toki, Kubo, PRC 35(87)1370 correlated microscopic cluster wave functions using Resonating Group Method (RGM), NN effective interaction + Coulomb (check charge symmetry), entrance channel distortions by local imaginary potential WD between clusters (from DWBA) compared to shell model wave functions data suggest importance of cluster correlations H.L. / KVI PAC Meeting

  4. origin of enhancement in cluster model decomposition of contributions inter-cluster (3H – 4He) relative motion absorbs large momentum transfer to fused system 7Li H.L. / KVI PAC Meeting

  5. Prediction for 0 fusion to 7Be chance to separate g.s. and 0.429 excited state: excellent application of dual-range QDC´s calculations but now data experiment strategy: final-state slectivity by -decay tagging simulated CM distribution with 25000 accepted events using cos2() distribution for pions H.L. / KVI PAC Meeting

  6. Inclusive d -  fusion M. Andersson et al., PL B 481 (00)165 measured integrated cross section (230 nb and 140 nb at 1.2 and 1.9 MeV above threshold) and strong forward-backward asymmetry data explained by process via quasi-deuteron: overlap  with quasi-d determines angular distribution H.L. / KVI PAC Meeting

  7. 4He 7Be* n 3He 0 Systematic study of cluster structures similar processes but with increasingly complex cluster structure: decisive tool: angular distributions final-state slectivity by -decay tagging 4He 7Be* 3He 0 ? 10B 12C* d d 0 6Li 9Be 12C* d 12C* n 0 3He d 0 6Li H.L. / KVI PAC Meeting

  8. angle acceptance of fusion products max. 3.8 deg in B mode radiative fusion (capture) pionic fusion ground state excited state (15.1 MeV) H.L. / KVI PAC Meeting

  9. momentum acceptance of fusion products array of ca. 50 phoswich detectors 100 m plastic/CsI 1.3X4 cm2 in focal plane of BBS for HI detection: fusion products of 10 – 30 A MeV B coverage of momentum distribution by HI detectors: all / accepted events H.L. / KVI PAC Meeting

  10. Summary Reactions with increasing complexity in cluster structure and different pion kinematics ) ( kinematics s-wave p-wave s-wave p-wave 98 H.L. / KVI PAC Meeting

  11. acceptance of neutral pions H.L. / KVI PAC Meeting

  12. TAPS schedule H.L. / KVI PAC Meeting

  13. Table of BBS parameters H.L. / KVI PAC Meeting

  14. Proposed reactions H.L. / KVI PAC Meeting

  15. design of liquid He target as buffer cryostatby Vacuum Specials Co. and P. Dendooven, J. Mulder, H. Timersma, H.L. H.L. / KVI PAC Meeting

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