Coulomb and Nuclear Breakup of Halo Nuclei INPP Main Page库仑和核分裂晕核学院主页.ppt

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Coulomb and Nuclear Breakup of Halo Nuclei INPP Main Page库仑和核分裂晕核学院主页.ppt

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Coulomb and Nuclear Breakup of Halo Nuclei INPP Main Page库仑和核分裂晕核学院主页

* Peak at Erel=Sn MACS(Maxwellian-averaged neutron capture cross section) = 7.4(4) mb * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * E1 Strength distribution of halo nuclei observed via the Coulomb breakup Takashi Nakamura Tokyo Institute of Technology Workshop on Statistical Nuclear Physics and Applications in Astrophysics and Technology, OHIO University, July 2008 Soft E1 Excitation of 2n halo nucleus --Coulomb Breakup of 11Li 3 Contents T. Nakamura, A.M.Vinodkumar et al.,PRL96, 252502 (2006). Soft E1 Excitation of 1n halo nucleus--- Coulomb Breakup of 11Be 4 SAMURAI Project @ RIBF 1 Introduction T.Nakamura et al.,PLB 331,296(1994). N.Fukuda, TN et al.,PRC70, 054606 (2004). 2 Coulomb Breakup of 15C: Application to Astrophysics Paper in preparation Ordinary Nucleus Photo- absorption of Nucleus p n Giant Dipole Resonance (GDR) Ex~80A-1/3MeV Ex B(E1) (E1 Transition Probability) g (=Eg) 9Li n n g Ex (=Eg) B(E1) (E1 Transition Probability) 10~20MeV 10~20MeV 1~2MeV 9Li Soft E1 Excitation E1 ? Reaction Mechanism of Soft E1 Excitation? Soft Dipole Resonance Direct Coulomb Breakup Slow Vibration of core against halo Ex(Peak) μ 8 5 Sn B(E1) μ 1/ Sn dB(E1) dEx μ| á exp(iqr)| rY1m|Fgs? |2 Z A Sn (Ex - Sn)3/2 Ex4 μ core n c.f. Pigmy Resonance Coulomb Breakup 11Be Heavy Target (Pb) 11Be* 10Be n g Excitation by a Virtual Photon Cross Section = (Photon Number）x(Transition Probability) b 0.3c Excitation Energy (=Photon Energy） Invariant Mass Spectroscopy dB(E1) dEx μ| á exp(iqr)| rY1m|Fgs? |2 Z A Sn (Ex - Sn)3/2 Ex4 μ Huge E1 Probability (usually B(E1) 10-3) B(E1) Observed for Neutron-halo１１Be nucleus core n T.Nakamura et al., PLB 331,296(1994) N.Fukuda et al., PRC70, 054606 (2004) Direct Breakup Model 11Be(70MeV/u)+Pb No Resonance But Huge Peak | Fgs (1/2+) ? = a |10Be(0+)?2s1/2 ? + b |10Be(2+)?1d5/2 ? a2 ,b2 : Spectroscopic factor dB(E1) dEx μ| á exp(iqr)| rY1m|Fgs? |2 Z A Sn (Ex - Sn)3/2 Ex4 μ a2 -Sn r ~ a2 |exp(-r/l)/r|2 Fourier Transform