Nuclear Spin-Isospin Excitations --- Towards exotic deformed nuclei Haozhao Liang （梁豪兆） RIKEN Nishina Center June 6, 2014 Advances in Radioactive Isotope.

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Presentation transcript:

Nuclear Spin-Isospin Excitations --- Towards exotic deformed nuclei Haozhao Liang （梁豪兆） RIKEN Nishina Center June 6, 2014 Advances in Radioactive Isotope Science 2014 June 1-6, 2014, Tokyo, Japan

 Introduction  Theoretical Framework  Results and Discussion  Towards Deformed Nuclei  Summary and Perspectives Contents ♦ Topic: Nuclear spin-isospin excitations ♦ Goal: Towards exotic deformed nuclei ♦ Method: Covariant Density Functional Theory + Finite Amplitude Method on 3D lattice

Nuclear spin-isospin excitations  β-decays in nature  charge-exchange reactions in lab These excitations are important to understand  spin and isospin properties of in-medium nuclear interaction  effective nucleon-nucleon tensor forces Bai:2010  neutron skin thickness Krasznahorkay:1999, Vretenar:2003, Yako:2006  β-decay rates of r-process nuclei Engel:1999, Borzov:2006  neutrino-nucleus cross sections Kolbe:2003, Vogel:2006, Paar:2008  ββ-decay rates Ejiri:2000, Avignone:2008  unitarity of Cabibbo-Kobayashi-Maskawa matrix Towner&Hardy:2010 The theories achieving consistent treatment of the spin and isospin degrees of freedom are highly desired.

Covariant density functional theory  Starting point: effective Lagrangian density Walecka & Serot:1986, Long:2006  Energy functional of the system ♦δE/δρ  equation of motion for nucleons: Dirac (-Bogoliubov) equations ♦δ 2 E/δρ 2  linear response equation: (Q)RPA equations Ring&Schuck:1980 A most promising theory: covariant density functional theory (CDFT)

Spin-isospin resonances Gamow-Teller and spin-dipole resonances Wakasa et al. RCNP HL, Giai, Meng, PRL 101, (2008); HL, Zhao, Meng, PRC 85, (2012) ♦New ingredient: exchange terms  Isoscalar mesons play an essential role via the exchange terms. ♦GTR and SDR excitation energies are described self-consistently.

β decays and r-process Nuclear β decays and r-process nucleosynthesis EURICA : Key RIKEN ♦EURICA project is providing lots of new β-decay data towards r-process path.

β decays and r-process Nuclear β-decay rates and r-process flow (Z = 20 ~ 50 region) Niu, Niu, HL, Long, Niksic, Vretenar, Meng, PLB 723, 172 (2013) FRDM: widely used nuclear input RHFB: CDFT results with T=0 pairing ♦Classical r-process calculation shows a faster r-matter flow at the N = 82 region and higher r-process abundances of elements with A ~ 140.

CKM matrix and its unitarity test HL, Giai, Meng, PRC 79, (2009); Satula et al., PRL 106, (2011); PRC 86, (2012) ♦Pinning down the uncertainty of δ c to level is also one of the key issues. ♦Model self-consistency is crucial for eliminating the artificial isospin symmetry breaking. Cabibbo-Kobayashi-Maskawa matrix |V ud | 2 + |V us | 2 + |V ub | 2 = (6) ?!!! Isospin symmetry-breaking corrections

Towards deformed nuclei Goal: To study spin-isospin excitations in exotic deformed nuclei  correct asymptotic behavior  to break all geometric symmetries  exotic shapes / exotic excitation modes  reasonable computational time CDFT on 3D lattice: ground states & excitations Zhou:2003 Lu:2013

CDFT on 3D lattice: ground states Challenge 1: Variational collapse Tanimura, HL, Hagino,... in preparation Solution: Inverse Hamiltonian method Challenge 2: Fermion doubling Preliminary results: 8 Be Solution: High-order Wilson terms Tanimura & Hagino, PRC 82, (2010)

CDFT on 3D lattice: excitations Computational challenge for the excitations in deformed systems HL, Nakatsukasa, Niu, Meng, PRC 87, (2013) ♦The combination CDFT + FAM works well for the spherical and also the axially deformed systems. Niksic et al., PRC 88, (2013) ♦To develop CDFT + FAM for the 3D deformed systems. A promising solution: Finite amplitude method Nakatsukasa, Inakura, Yabana, PRC 76, (2007) (Left: data from Avogadro:2013)

Summary and Perspectives Self-consistent and covariant descriptions of nuclear spin-isospin excitations for spherical cases. spin-isospin resonances, r-process, CKM unitarity, …. Towards deformed cases: CDFT on 3D lattice  Ground states: Solving Dirac equations on 3D lattice inverse Hamiltonian method, high-order Wilson terms  Excitations: Finite amplitude method for relativistic RPA In lattice representation, the effects of Dirac sea can be included implicitly and automatically. Exotic shapes Exotic excitation modes ……

Acknowledgments In collaboration with INFN-Milan Gianluca Colò, Xavier Roca-Maza, Yifei Niu Tohoku U. Kouichi Hagino, Yusuke Tanimura Tokyo U. Sci. Chikako Ishizuka Lanzhou U. Wen Hui Long Peking U. Jie Meng, Pengwei Zhao RIKEN Takashi Nakatsukasa Zagreb U. Tamara Nikšić, Dario Vretenar Anhui U. Zhongming Niu TUM Peter Ring Osaka U. Hiroshi Toki IPN-Orsay Nguyen Van Giai ITP-CAS Shan-Gui Zhou Thank you!