Structures of Exotic 131,133 Sn Isotopes for r-process nucleosynthesis Shisheng Zhang 1,2 ( 张时声 ) 1. School of Physics and Nuclear Energy Engineering,

Slides:



Advertisements
Similar presentations
HIGS2 Workshop June 3-4, 2013 Nuclear Structure Studies at HI  S Henry R. Weller The HI  S Nuclear Physics Program.
Advertisements

Giant resonances, exotic modes & astrophysics
Spectroscopy at the Particle Threshold H. Lenske 1.
Testing isospin-symmetry breaking and mapping the proton drip-line with Lanzhou facilities Yang Sun Shanghai Jiao Tong University, China SIAP, Jan.10,
Delta-hole effects on the shell evolution of neutron-rich exotic nuclei Takaharu Otsuka University of Tokyo / RIKEN / MSU Chiral07 Osaka November 12 -
Possible existence of neutral hyper-nucleus with strangeness -2 and its production SPN 2014, Changsha, Dec , 2014 Institute of High Energy Physics.
Testing shell model on nuclei
DNP, Hawaii 2014 Non-local potentials in nuclear reactions Luke Titus and Filomena Nunes Michigan State University.
K. Kaneko Kyushu Sangyo University, Fukuoka, Japan Particle-number conservation for pairing transition in finite systems A. Schiller Michigan State University,
W A RICHTER UNIVERSITY OF THE WESTERN CAPE Shell-model studies of the rp reaction 25 Al(p,γ) 26 Si.
Beta decay and Structure of Exotic Nuclei near 78 Ni Alexander Lisetskiy NSCL,JINA,MSU.
Finite Nuclei and Nuclear Matter in Relativistic Hartree-Fock Approach Long Wenhui 1,2, Nguyen Van Giai 2, Meng Jie 1 1 School of Physics, Peking University,
Shan-Gui Zhou URL: 1.Institute of Theoretical Physics,
Open Problems in Nuclear Level Densities Alberto Ventura ENEA and INFN, Bologna, Italy INFN, Pisa, February 24-26, 2005.
Renormalized Interactions with EDF Single-Particle Basis States
Oslo, May 21-24, Systematics of Level Density Parameters Till von Egidy, Hans-Friedrich Wirth Physik Department, Technische Universität München,
Structure of Be hyper-isotopes Masahiro ISAKA (RIKEN) Collaborators: H. Homma and M. Kimura (Hokkaido University)
Coupled-Channel Computation of Direct Neutron Capture and (d,p) reactions on Non- Spherical Nuclei Goran Arbanas (ORNL) Ian J. Thompson (LLNL) with Filomena.
Statistical properties of nuclei: beyond the mean field Yoram Alhassid (Yale University) Introduction Beyond the mean field: correlations via fluctuations.
Α - capture reactions using the 4π γ-summing technique Α. Lagoyannis Institute of Nuclear Physics, N.C.S.R. “Demokritos”
The first systematic study of the ground-state properties of finite nuclei in the relativistic mean field model Lisheng Geng Research Center for Nuclear.
Nuclear Level Densities Edwards Accelerator Laboratory Steven M. Grimes Ohio University Athens, Ohio.
Beatriz Jurado, Karl-Heinz Schmidt CENBG, Bordeaux, France Supported by EFNUDAT, ERINDA and NEA The GEneral Fission code (GEF) Motivation: Accurate and.
Ning Wang 1, Min Liu 1, Xi-Zhen Wu 2, Jie Meng 3 Isospin effects in nuclear mass models Nuclear Structure and Related Topics (NSRT15), , DUBNA.
Rotation and alignment of high-j orbitls in transfermium nuclei Dr. Xiao-tao He College of Material Science and Technology, Nanjing University of Aeronautics.
Tensor force induced short-range correlation and high density behavior of nuclear symmetry energy Chang Xu ( 许 昌 ) Department of Physics, Nanjing Univerisity.
Effects of self-consistence violations in HF based RPA calculations for giant resonances Shalom Shlomo Texas A&M University.
Alex Brown UNEDF Feb Strategies for extracting optimal effective Hamiltonians for CI and Skyrme EDF applications.
Structure of neutron-rich A~60 nuclei: A theoretical perspective Yang Sun Shanghai Jiao Tong University, China KAVLI-Beijing, June 26, 2012.
Ning Wang 1, Min Liu 1, Xi-Zhen Wu 2, Jie Meng 3 Isospin effect in Weizsaecker-Skyrme mass formula ISPUN14, , Ho Chi Minh City 1 Guangxi Normal.
1 Proton-neutron pairing by G-matrix in the deformed BCS Soongsil University, Korea Eun Ja Ha Myung-Ki Cheoun.
F. Sammarruca, University of Idaho Supported in part by the US Department of Energy. From Neutron Skins to Neutron Stars to Nuclear.
-NUCLEUS INTERACTIONS OPEN QUESTIONS and FUTURE PROJECTS Cristina VOLPE Institut de Physique Nucléaire Orsay, France.
KITPC, Jun 14th, 2012 Spin-Isospin excitations as quantitative constraint for the Skyrme tensor force Chunlin Bai Department of Physics, Sichuan University.
Coupling of (deformed) core and weakly bound neutron M. Kimura (Hokkaido Univ.)
M. Matsuo, PRC73(’06) Matter Calc. Two-particle density.
Nuclear Collective Excitation in a Femi-Liquid Model Bao-Xi SUN Beijing University of Technology KITPC, Beijing.
Anomalous two-neutron transfer in neutron-rich Ni and Sn isotopes studied with continuum QRPA H.Shimoyama, M.Matsuo Niigata University 1 Dynamics and Correlations.
ShuangQuan Zhang School of Physics, Peking University Static chirality and chiral vibration of atomic nucleus in particle rotor model.
Ning Wang An improved nuclear mass formula Guangxi Normal University, Guilin, China KITPC , Beijing.
Lawrence Livermore National Laboratory Effective interactions for reaction calculations Jutta Escher, F.S. Dietrich, D. Gogny, G.P.A. Nobre, I.J. Thompson.
Extended Brueckner-Hartree-Fock theory in many body system - Importance of pion in nuclei - Hiroshi Toki (RCNP, KEK) In collaboration.
1 Gamow-Teller strength in deformed QRPA with np-pairing Eun Ja Ha (Soongsil University) in collaboration with Myung-Ki Cheoun (Soongsil University) F.
Three-body force effect on the properties of asymmetric nuclear matter Wei Zuo Institute of Modern Physics, Lanzhou, China.
July 29-30, 2010, Dresden 1 Forbidden Beta Transitions in Neutrinoless Double Beta Decay Kazuo Muto Department of Physics, Tokyo Institute of Technology.
Variational approach to isospin symmetry breaking in medium mass nuclei A. PETROVICI Institute for Physics and Nuclear Engineering, Bucharest, Romania.
THEORETICAL PREDICTIONS OF THERMONUCLEAR RATES P. Descouvemont 1.Reactions in astrophysics 2.Overview of different models 3.The R-matrix method 4.Application.
Shape evolution of highly deformed 75 Kr and projected shell model description Yang Yingchun Shanghai Jiao Tong University Shanghai, August 24, 2009.
The i 13/2 Proton and j 15/2 Neutron Orbital and the SD Band in A~190 Region Xiao-tao He En-guang Zhao En-guang Zhao Institute of Theoretical Physics,
Reaction cross sections of carbon isotopes incident on proton and 12 C International Nuclear Physics Conference, Tokyo, Japan June 3-8, 2007 W. Horiuchi.
Faddeev Calculation for Neutron-Rich Nuclei Eizo Uzu (Tokyo Univ. of Science) Collaborators Masahiro Yamaguchi (RCNP) Hiroyuki Kamada (Kyusyu Inst. Tech.)
Variational Multiparticle-Multihole Configuration Mixing Method with the D1S Gogny force INPC2007, Tokyo, 06/06/2007 Nathalie Pillet (CEA Bruyères-le-Châtel,
1 Recent Results on J/  Decays Shuangshi FANG Representing BES Collaboration Institute of High Energy Physics, CAS International Conference on QCD and.
超重原子核的结构 孙 扬 上海交通大学 合作者:清华大学 龙桂鲁, F. Al-Khudair 中国原子能研究院 陈永寿,高早春 济南,山东大学, 2008 年 9 月 20 日.
Large-Scale Shell-Model Study of the Sn-isotopes
Shell-model calculations for the IoI —a review from a personal point of view Yutaka Utsuno Advanced Science Research Center, Japan Atomic Energy Agency.
Tutor: Prof. Yang Sun (孙扬 教授)
Nuclear structure far from stability
Resonance and continuum in atomic nuclei
Nuclear structure of lowest 229Th states
Structure and dynamics from the time-dependent Hartree-Fock model
Exotic nuclei beyond 132Sn: where do we stand?
Structure of exotic nuclei from relativistic Hartree Bogoliubov model (II) Shan-Gui Zhou URL:
Deformed relativistic Hartree Bogoliubov model in a Woods-Saxon basis
The role of fission in the r-process nucleosynthesis
Rotation and alignment of high-j orbitls in transfermium nuclei
Institut de Physique Nucléaire Orsay, France
An improved nuclear mass formula
Department of Physics, Sichuan University
Probing correlations by use of two-nucleon removal
Presentation transcript:

Structures of Exotic 131,133 Sn Isotopes for r-process nucleosynthesis Shisheng Zhang 1,2 ( 张时声 ) 1. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing , China 2. Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing , China 29th, June 2012 KITPC Joint Workshop on Nuclear Physics, Beijing, China 11th June – 30th June, 2012

Outline  Background and Motivation  nuclear structure  nuclear astrophysics  Goals  Theoretical Methods  Results and discussions  Summary and outlook

Background : nuclear structure Theoretical understanding ? Not yet! Experiments: Four strong single particle bound levels with striking similarity  level spacings  strengths recently measured in 131 Sn and 133 Sn K. L. Jones et al., Nature, 465, 454 (2010). R. L. Kozub et al., (submitted to PRL 2012).

Background : nuclear astrophysics bound levels resonant levels (above neutron capture thresholds) neutron capture (NC) cross section synthesis of heavy elements in the r- process in supernovae NC reaction rate R. Surman, J. Beun, G. C. McLaughlin and W. R. Hix, PRC 79, (2009). ?? Significantly impact ! Global impact of 130 Sn(n,  ) on r-process abundances

 3 contributions to neutron capture cross section Background : nuclear astrophysics S(n) Direct Capture Resonant Capture H F Averaging over many closely-spaced levels strong dependence on level density model For Fermi gas model, when is HF applicable? Levels above S(n) are unknown contribution to  total unknown Strong bound single particle levels below S(n) contribute ratios to  RC and  HF are unknown g.s. ExEx

Outline  Background and Motivation  nuclear structure  nuclear astrophysics  Goals  Theoretical Methods  Results and discussions  Summary and outlook

Goals Understand the structure of the bound and resonant levels in 133 Sn and 131 Sn from the theoretical point of view and check if similarity appears in theoretical calculations Determine if the density of unbound resonant levels is sufficiently high to enable valid statistical model calculations for NC cross section calculations on 130,132 Sn

Outline  Background and Motivation  nuclear structure  nuclear astrophysics  Goals  Theoretical Methods  Results and discussions  Summary and outlook

 Shell model  large scale shell model (LSS)  Phenomenological models  Koura-Yamada's s.p. potential (KYSPP)  Nilsson s.p. potential with new parameter set  Macroscopic-microscopic model  finite-range droplet model (FRDM)  Microscopic mean field model  HFB  RMF  RMF+ACCC+BCS Theoretical Methods

 Large scale shell model (LSS)  extended paring-plus-quadrupole models with monopole corrections (EPQQM) model  Pairing terms, quadrupole-quadrupole term, octupole- octupole term, hexadecupole-hexadecupole term, monopole corrections are included in Hamiltonian.  Model space from the experimental data:  upper neutron orbits 2f 7/2, 3p 3/2, 1h 9/2, 3p 1/2, 2f 5/2 (without 1i 13/2 since this orbit have not been seen experimentally so far ). Unfortunately, the calculations with it require prohibitively large amounts of computer memory when NUSHELLX code used. Shell models H. Jin, M. Hasegawa, S. Tazaki, K. Kaneko and Y. Sun, PRC 84, (2011).

 Shell model  large scale shell model (LSS)  Phenomenological models  Koura-Yamada's s.p. potential (KYSPP)  Nilsson s.p. potential with new parameter set  Macroscopic-microscopic model  finite-range droplet model (FRDM)  Microscopic mean field model  HFB  RMF  RMF+ACCC+BCS Theoretical Methods

 Nilsson s.p. potential with new parameter set Phenomenological model J. Y. Zhang, Y. Sun, M. Guidry, L. L. Riedinger and G. A. Lalazissis, Phys. Rev. C 58, R2663 (1998). 133 Sn 131 Sn

Nucleus Methods 133 Sn 131 Sn Bound orbitals Resonant orbitals Bound orbitals Resonant orbitals RMF+ACCC+BCS (present work) YYYY RMF Y1i 13/2, Y above, N YN LSS YNNN KYSPP YNNN Nilsson Y1i 13/2, Y above, N NN FRDM YNNN HFB YNNN Previous Work:

 bound orbitals: RMF (NL3 eff. interaction)  resonant orbitals: RMF-ACCC  pairing correlations: BCS approx. A fully self-consistent microscopic method! Successfully describe the properties for 120 Sn, Ni, Zr, 17 Ne, Ne, 131,133 Sn RMF+ACCC+BCS Method S. S. Zhang, S. G. Zhou, J. Meng and G. C. Hillhouse, PRC 82, 2031 (2004). S. S. Zhang, IJMPE 82, 2031 (2009). MPLA (2004) IJMPE (2009) EPJA (2012) Present work submitted to PRC(2012) arXiv (2011) 1. Narrow and not narrow 2. l =0 and l > 0 3. bound-type method

Outline  Background and Motivation  nuclear structure  nuclear astrophysics  Goals  Theoretical Method  Results and discussions  Summary and outlook

Results Relative Excitation Energy [MeV]

Similarity Such similarity does not happen at all shell closures…

similar

Such similarities are not the norm: the case for 47,49 Ca ( 39,41 Ca) across N=28 (20) shell closure display significant changes in level spacings. Discussion I B. A. Brown et al, PRC 58, 2099 (1998).

 Levels above the neutron capture threshold are limited. At most one s. p. resonant level 1i 13/2 appears in the effective energy window.  Need 5 ( s wave) -10 (high l ) levels per MeV  We predict level spacing far too sparse for HF model use Discussion II T. Rauscher et. al. Atom. Data. and Nucl. Data. Tab. 75, 1 (2000). T. Rauscher et. al. Phys. Rev. C 56, 1613 (1997).

Outline  Background and Motivation  nuclear structure  nuclear astrophysics  Goals  Theoretical Method  Results and discussions  Summary and outlook

 Reproduce four observed strong s.p. bound levels in 131,133 Sn, and similarity of level spacing and strength with our approach.  Such similarity does not always occur across shell closures (e.g. N = 20, 28).  Predict no single-particle levels at energies above and near the neutron threshold S(n), and only one level up to 2.5 MeV above the S(n)  The density of resonant levels is too low to enable statistical models with Fermi gas level densities to calculate neutron capture cross sections. Summary

 Our analysis suggests that alternative methods of calculating the neutron captures on 130,132 Sn must be utilized for r- process nucleosynthesis studies.  This result also suggests the necessity for experimental measurements of s.p. bound and resonant level structure of heavy neutron-rich nuclei that are in and near the r-process.  Systematical study on odd-A Sn isotopes will be made in near future. Outlook

Collaborators  M. S. Smith, G. Arbanas and R. L. Kozub, ORNL, USA (this work)  U. Lombardo, INFN, Italy  S. G. Zhou and E. G. Zhao, ITP, Beijing Thank you !

Fermi gas model Total Fermi gas state density : : the level density parameter : spacing of the proton (neutron) s.p. states near Fermi energy. the energy shift : is an empirical parameter equal to pairing energy; : excitation energy

 Shell model  large scale shell model (LSS)  Phenomenological models  Koura-Yamada's s.p. potential (KYSPP)  Nilsson s.p. potential with new parameter set  Macroscopic-microscopic model  finite-range droplet model (FRDM)  Microscopic mean field model  HFB  RMF  RMF+ACCC+BCS Methods

 Large scale shell model (LSS)  realistic effective interactions :  derived from charge-dependent (CD) Bonn NN potential  Model space from the experimental data :  2f 7/2, 3p 3/2, 1h 9/2, 3p 1/2, 2f 5/2 and 1i 13/2 (included but not confirmed from experimentally; can be estimated to be  0.2 MeV; above the 132 Sn + n threshold 2.45(5) MeV )  Sn (even and odd Sn isotopes) Shell models I M. P. Kartamyshev, T. Engeland, M. Hjorth-Jensen and E. Osnes, Phys. Rev. C 76, (2007). EXP.

 Shell model  large scale shell model (LSS)  Phenomenological models  Koura-Yamada's s.p. potential (KYSPP)  Nilsson s.p. potential with new parameter set  Macroscopic-microscopic model  finite-range droplet model (FRDM)  Microscopic mean field model  HFB  RMF  RMF+ACCC+BCS Methods

 Koura-Yamada's s.p. potential (KYSPP)  Central component is an extension of the Woods-Saxon potential Phenomenological approaches H. Koura, M. Yamada, NPA 671, 96 (2000). S. Chiba, H. Koura etc. PRC 77, (2008). × √

 Shell model  large scale shell model (LSS)  Phenomenological model  Koura-Yamada's s.p. potential (KYSPP)  Nilsson s.p. potential with new parameter set  Macroscopic-microscopic model  finite-range droplet model (FRDM)  Microscopic mean field model  HFB  RMF  RMF+ACCC+BCS Methods

 finite-range droplet model (FRDM)  with a folded-Yukawa s.p. potential  Lipkin-Nogami paring Macroscopic-microscopic T. Rauscher, etc. PRC 57, 2031 (1998). NLSH × √

 Shell model  large scale shell model (LSS)  Phenomenological model  Koura-Yamada's s.p. potential (KYSPP)  Nilsson s.p. potential with new parameter set  Macroscopic-microscopic model  finite-range droplet model (FRDM)  Microscopic mean field model  HFB  RMF  RMF+ACCC+BCS Methods

 Skyrme-HFB  RMF model Microscopic mean field model T. Rauscher, etc. PRC 57, 2031 (1998). NLSH × √