Role of the Nucleus-Nucleus Potential in Sub-barrier Fusion
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1 Role of the Nucleus-Nucleus Potential in Sub-barrier Fusion Şerban Mişicu NIPNE-HH, Bucharest INT Program INT-13-3 Quantitative Large Amplitude Shape Dynamics: Fission and Heavy Ion Fusion Nuclear Physics Presence and Future Seattle, 18 October 2013
2 Role of the Nucleus-Nucleus Potential in Sub-barrier Fusion * Introductory remarks * Nucleus-Nucleus Potential : - Nucleon-Nucleon interaction - Orientation * Sub-barrier Fusion - Capture Reactions with 48Ca projectile - Hindrance to fusion deep under the barrier
3 SUB-BARRIER FUSION - Formation of the compound nucleus through the quantum tunneling of the Coulomb barrier of two nuclei (E<Bc)
4 SUB-BARRIER FUSION : Introductory remarks - Test the nuclear potential inside the barrier - Enhancement of cross-sections due to nuclear structure : vibrational nuclei(sensitivity to multi-phonon excitations), rotational excitations (effect of higher multipole defomations) - Gate to the synthesis of heavy and superheavy nuclei - Burning Cycles (C & O) in massive stars extrapolation of near-barrier data on σf of C and O reactions down to astrophysical energies
5 Double folding Heavy Ion Potential
6 Double folding Heavy Ion Potential Ground state one-body densities(spherical): M3Y : Fermi-Dirac with FRLDM parameters Skyrme : HFBRAD Gogny : HFB Ground state one-body densities(deformed):
7 Double folding Heavy Ion Potential (σ,τ) representation From the exceedingly large number of exchange terms retain only the knock-on (KOE) term : two nucleons are interacting and in the same time are exchanged
8 G-matrix interactions G-matrix elements of a bare NN interaction in an oscillator basis were obtained solving Bethe-Goldstone equation and then fitted with a sum of Yukawa f.f. (I) M3Y-Reid (standard) [Bertsch et al., NPA 284, 399 (1977)] (ii) M3Y-Paris [Antaraman,Toki and Bertsch, NPA 398, 269 (1978)] (iii) M4Y-Paris [Hosaka,Kubo,Toki, NPA 444, 76 (1985)] G-matrix interactions are local and purely real. Density dependence is implicit through the oscillator parameter and it is characteristic to NM/3
9 Density-dependent effective interactions Gogny interaction : a sum of central, finite-range term and a zero-range d.d. Term neglect spin-orbit term for spin-saturated nuclei (σ,τ) representation
10 Density-dependent effective interactions Skyrme interaction : a sum of a zero-range local, non-local and d.d. terms (σ,τ) representation
11 Exchange Kernels (finding a local equivalent) Pseudopotential approximation : Energy dependence Perey-Saxon localization procedure: Full recoil included
12 Orientation
13 Orientation Fixed Molecular Axis
14 Orientation Touching Configurations (i) Pole-Pole(nose-to-nose) (ii) Pole-Equator(nose-to-bely) (iii) Equator-Equator(belly-to-bely) (iv) Equator-Equator Twisted(crossed bellies)
15 148 Orientation Ba+104Mo Ş.Mişicu&W.Greiner, JPG 28, 2861 (2002).
16 Capture Reactions with Ca projectile 48 Ş.Mişicu&W.Greiner, PRC 66, (2002).
17 Coupling with Rotational Band States
18 Ş.Mişicu&W.Greiner, PRC 69, (2004).
19 Ş.Mişicu&W.Greiner, PRC 69, (2004).
20 Ş.Mişicu&W.Greiner, PRC 69, (2004).
21
22
23 Barrier Distribution Probability to encounter a fusion barrier of height E
24 Effect of various Orientations
25 SUB-BARRIER FUSION : Hindrance for E<Es 2001-Jiang conjectures that the hindrance of fusion far below the Coulomb barrier is a general phenomenon for many heavy-ion systems. E<Es
26 SUB-BARRIER FUSION : early attempts to solve the puzzle Fail to describe the lowest points C.L.Jiang et al. (PRC69,014604) Hagino, Rowley and Dasgupta (PRC 67, (2006))
27 Outgoing boundary conditions Transmission coefficient Cross section
28 Repulsive Core Calculate the cost of overlapping completely the ions from the EOS Equate the cost to the (increase in HI potential)/particle EOS Thomas-Fermi Model (Myers&Swiatecki) Incompressibility of Cold Nuclear Matter at saturation
29 Repulsive Core Approximations to calibrate the strength of the repulsion
30 Shallow potential S.Misicu&H.Esbensen, PRC 75, (2007)
31 Fusion Cross-Sections vs. EOS
32 Diagnostic Tools: Astrophysical S-factor - Magnify the low-energy behavior of cross-sections
33 M3Y+repulsion vs.woods-saxon
34 SUB-BARRIER FUSION : Maxium of S 58 Ni+58Ni, Q= MeV 64 Ni+64Ni, Q= MeV Argonne Data 64 Ni+100Mo, Q=92.29 MeV Argonne Data S.Misicu&H.Esbensen, PRL 96,112701(2006), PRC 75, (2007).
35 SUB-BARRIER FUSION : Maxium of S S.Misicu&H.Esbensen, PRL 96,112701(2006), PRC 75, (2007).
36
37
38 SUB-BARRIER FUSION : Hindrance but no maxium of S Legnaro (2009)
39 SUB-BARRIER FUSION : Hindrance but no maxium of S
40 SUB-BARRIER FUSION : Hindrance but no maxium of S
41 SUB-BARRIER FUSION : Lighter systems - WILL THE HINDRANCE PERSIST, and how will it affect the extrapolation to astrophysical reaction rates? YES! Jiang et al. PRC 75, , 2007 Gasques et al., PRC 76, 03582, 2007 NO! Misicu&Carstoiu, NPA 834, 180c(2010)
42
43
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45 Acknowledgements Work supported by MSR, CNCSIS(Romania).
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