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Diproton correlation in a proton-rich Borromean nucleus 17 Ne. Tomohiro Oishi A , Kouichi H agino A , Hiroyuki Sagawa B. A T ohoku U niv., B U niv . of Aizu. 1. Introduction 2. Model 3. Results 4. Summary. http://arxiv.org/abs/1007.0835. 1.1 Dineutron correlation.
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Diproton correlation in aproton-rich Borromeannucleus 17Ne Tomohiro OishiA, KouichiHaginoA, Hiroyuki SagawaB ATohokuUniv., BUniv. of Aizu • 1. Introduction • 2. Model • 3. Results • 4. Summary http://arxiv.org/abs/1007.0835
1.1 Dineutron correlation Dineutron correlation in 2n-Borromean nuclei(theoretically predicted): K.Hagino, and H.Sagawa, PRC72(‘05)044321 Remarkable localization of two neutrons “dineutron correlation”. How about two protons in a weakly bound system?
1.2 17Ne nucleus(2) Typical “2p-Borromean” nucleus; proton-unbound, stable for proton emission. 17Ne is an ideal system to analyze diproton correlation.
2.1 Three-body-model Off-diagonal
2.2 Pairing interaction Explicit Coulomb interaction Density-dependentcontact interaction We need cutoff:EC to determine v0 (pairing in vacuum). Other parameters are fixed to obtaing.s.energyof 17Ne:-0.944 MeV.
2.3 Single-particle basis Woods-Saxon + Coulomb potential for p-Core
Averaged Resonances
2.3 Box-approximation Put infinite wall at r=Rbox: Continuum states are discretized. Resonances of 16F at 0.675 MeV (s1/2) and at 1.129 MeV (d5/2) are reproduced.
2.5 Expansion with s.p.basis Determined by diagonalization 0+ configuration for g.s.
S.Hilaire et al., Phys.Lett.B531(2002) Pairing gap of protons and neutrons protons neutrons
3.2 Results (2) “Diproton correlation”
4. Summary We performed three-body-model calculation for 17Newith density-dependent contact pairing and the Coulomb interaction. Coulomb repulsion contributes about 14% reduction to pairing energy. Existence of strong “diproton correlation”. Future works: application to 2p-emission.