Evolution of octupole collectivity in 221Th

Slides:

Advertisements

Similar presentations

Some (more) Nuclear Structure

Advertisements

University of Liverpool

Isomers and shape transitions in the n-rich A~190 region: Phil Walker University of Surrey prolate K isomers vs. oblate collective rotation the influence.

The Collective Model Aard Keimpema.

Projected-shell-model study for the structure of transfermium nuclei Yang Sun Shanghai Jiao Tong University Beijing, June 9, 2009.

High spin states in 136,137 La, 148 Ce and 105 Mo.

R. Palit Department of Nuclear and Atomic Physics

Review of PHYSICAL REVIEW C 70, (2004) Stability of the N=50 shell gap in the neutron-rich Rb, Br, Se and Ge isotones Y. H. Zhang, LNL, Italy David.

UNIVERSITY OF JYVÄSKYLÄ Lifetime measurements probing triple shape coexistence in 175 Au Tuomas Grahn Department of Physics University of Jyväskylä The.

The Shell Model of the Nucleus 5. Nuclear moments

Study Of Nuclei at High Angular Momentum – Day 2 Michael P. Carpenter Nuclear Physics School, Goa, India Nov. 9-17, 2011 Outline 1)Introduction 2)Deformation.

The stability of triaxial superdeformed shape in odd-odd Lu isotopes Tu Ya.

5. Exotic modes of nuclear rotation Tilted Axis Cranking -TAC.

Rotation and alignment of high-j orbitls in transfermium nuclei Dr. Xiao-tao He College of Material Science and Technology, Nanjing University of Aeronautics.

Collective Model. Nuclei Z N Character j Q obs. Q sp. Qobs/Qsp 17 O 8 9 doubly magic+1n 5/ K doubly magic -1p 3/

High-spin structures in the 159 Lu nucleus Jilin University, China Institute of Atomic Energy 李聪博 The 13th National Nuclear Structure Conference of China.

Hypernuclear Production with Hadronic and Electromagnetic Probes Radhey Shyam Saha Institute of Nuclear Physics, Kolkata, India Z.Zt. Institut f. Theo.

1 In-Beam Observables Rauno Julin Department of Physics University of Jyväskylä JYFL Finland.

Incomplete fusion studies near Coulomb barrier Pragya Das Indian Institute of Technology Bombay Powai, Mumbai , India.

Nuclear Models Nuclear force is not yet fully understood.

The Highs and Lows of the A~100 Region Paddy Regan Dept. of Physics, University of Surrey, UK and WNSL, Yale University, New Haven, CT

The changing structure of 160 Er from low to ultrahigh spin J. Ollier Daresbury Laboratory.

ESNT Saclay February 2, Structure properties of even-even actinides at normal- and super-deformed shapes J.P. Delaroche, M. Girod, H. Goutte, J.

Symmetries and collective Nuclear excitations PRESENT AND FUTURE EXOTICS IN NUCLEAR PHYSICS In honor of Geirr Sletten at his 70 th birthday Stefan Frauendorf,

ShuangQuan Zhang School of Physics, Peking University Static chirality and chiral vibration of atomic nucleus in particle rotor model.

Probed with radioactive beams at REX-ISOLDE Janne Pakarinen – on behalf of the IS494 collaboration – University of Jyväskylä ARIS 2014 Tokyo, Japan Shapes.

By Billy Mohr Advisor: Professor Daryl Hartley Sponsored by the National Science Foundation.

W. Nazarewicz. Limit of stability for heavy nuclei Meitner & Frisch (1939): Nucleus is like liquid drop For Z>100: repulsive Coulomb force stronger than.

Search for chiral doublet structures in odd-A 79 Kr with the Hyperball2 CYRIC CYRIC/Tohoku University J.Timar ATOMKI (Hungary) K. Starosta (MSU)

Nuclear and Radiation Physics, BAU, First Semester, (Saed Dababneh). 1 Extreme independent particle model!!! Does the core really remain inert?

July 29-30, 2010, Dresden 1 Forbidden Beta Transitions in Neutrinoless Double Beta Decay Kazuo Muto Department of Physics, Tokyo Institute of Technology.

Some (more) High(ish)-Spin Nuclear Structure Paddy Regan Department of Physics Univesity of Surrey Guildford, UK Lecture 2 Low-energy.

Variational approach to isospin symmetry breaking in medium mass nuclei A. PETROVICI Institute for Physics and Nuclear Engineering, Bucharest, Romania.

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,

Nordita Workshop on chiral bands /04/2015 Multiple chiral bands associated with the same strongly asymmetric many- particle nucleon configuration.

Lecture 4 1.The role of orientation angles of the colliding nuclei relative to the beam energy in fusion-fission and quasifission reactions. 2.The effect.

Dimitar Tonev, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences Lifetime measurements in mass regions A=100 and A=130 as.

Rotational energy term in the empirical formula for the yrast energies in even-even nuclei Eunja Ha and S. W. Hong Department of Physics, Sungkyunkwan.

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.

of very neutron deficient heavy nuclei

Determining Reduced Transition Probabilities for 152 ≤ A ≤ 248 Nuclei using Interacting Boson Approximation (IBA-1) Model By Dr. Sardool Singh Ghumman.

Observation of Octupole Correlations in Ba and Ce Nuclei

Workshop Spiral II - Caen 4-6th October 2005

The role of isospin symmetry in medium-mass N ~ Z nuclei

Content of the talk Exotic clustering in neutron-rich nuclei

Shape parameterization

DSAM lifetime measurements in 194Tl

Nuclear structure of lowest 229Th states

Zao-Chun Gao(高早春) China Institute of Atomic Energy Mihai Horoi

Structure and dynamics from the time-dependent Hartree-Fock model

Emmanuel Clément IN2P3/GANIL – Caen France

Systematic study of Z = 83 nuclei: 193,194,195Bi

PHL424: γ-decay γ-decay is an electromagnetic process where the nucleus decreases in excitation energy, but does not change proton or neutron numbers This.

Isospin Symmetry test on the semimagic 44Cr

Isomers and shape transitions in the n-rich A~190 region:

Nuclear Chemistry CHEM 396 Chapter 4, Part B Dr. Ahmad Hamaed

2Joint Institute for Nuclear Research, Dubna , Russia

Introduction Calculations for the N=7 isotones Summary

Kernfysica: quarks, nucleonen en kernen

a non-adiabatic microscopic description

Nuclear Decays Unstable nuclei can change N,Z.A to a nuclei at a lower energy (mass) If there is a mass difference such that energy is released, pretty.

Rotation and alignment of high-j orbitls in transfermium nuclei

High spin physics- achievements and perspectives

Quest for chirality in 107Ag

Nuclei at the Extremes of Spin: The Superdeformed Bands in 131,132Ce

Kazuo MUTO Tokyo Institute of Technology

Shape-coexistence enhanced by multi-quasiparticle excitations in A~190 mass region 石跃北京大学导师：许甫荣教授

V.V. Sargsyan, G.G. Adamian, N.V.Antonenko

Alex Brown PAN July 26, 2018.

Presentation transcript:

Evolution of octupole collectivity in 221Th Centre for Basic Sciences, Mumbai Evolution of octupole collectivity in 221Th Sujit Tandel UM-DAE Centre for Basic Sciences, Mumbai

Octupole collectivity in A≈220 region Centre for Basic Sciences, Mumbai Octupole collectivity in A≈220 region Z N Enhanced octupole collectivity due to closely-spaced high-j proton and neutron orbitals near the Fermi surface with Dj, Dl=3 June 3, 2013 INPC 2013: Sujit Tandel

Experiment from 14UD BARC-TIFR Pelletron Centre for Basic Sciences, Mumbai Experiment 208Pb (16O, 3n) 221Th @ 86 MeV from 14UD BARC-TIFR Pelletron (≈18% cross-section for fusion-evaporation) 99.6% enriched 208Pb target (5.5 mg/cm2) 19 Compton-suppressed clover Ge detectors: Indian National Gamma Array (INGA) Triggerless DSP-based Data Acquisition g-g and g-g-g coincidences June 3, 2013 INPC 2013: Sujit Tandel

Excited level structure of 221Th Centre for Basic Sciences, Mumbai Excited level structure of 221Th M. Dahlinger et al., Nucl. Phys. A 484, 337 (1988) Deleted Yrast Non-Yrast (≈20-25% of yrast) Two alternating parity sequences in 221Th Transitions at high spin in yrast structure modified New non-yrast structure established New June 3, 2013 INPC 2013: Sujit Tandel

Alternating parity sequences in 221Th Centre for Basic Sciences, Mumbai Alternating parity sequences in 221Th Yrast Non-Yrast June 3, 2013 INPC 2013: Sujit Tandel

Placement of new transitions in 221Th Centre for Basic Sciences, Mumbai Placement of new transitions in 221Th Incorrectly assigned Newly assigned Interband transitions Non-yrast structure New E1 transitions Yrast structure June 3, 2013 INPC 2013: Sujit Tandel

Energy splitting for alternating parity states Centre for Basic Sciences, Mumbai Energy splitting for alternating parity states N=129 Yrast Non-yrast N=131 No parity doublets in 221Th since ground state has predominantly low-K configuration N=133 223Th: textbook example of nucleus with near-static octupole deformation N=135 dE → 0 for static octupole deformation (parity doublets) June 3, 2013 INPC 2013: Sujit Tandel

Neutron single particle levels (Woods-Saxon potential) Centre for Basic Sciences, Mumbai Neutron single particle levels (Woods-Saxon potential) b3=0.0 b2=0.18 b3=0.1 Low-K components near N=132 W = 5/2 W = 1/2 W = 3/2 G.A. Leander and Y.S. Chen, Phys. Rev. C 37, 2744 (1988) June 3, 2013 INPC 2013: Sujit Tandel

Configurations and octupole barriers Centre for Basic Sciences, Mumbai Configurations and octupole barriers Octupole barriers quite substantial in 221Th; highest for W=5/2 in 223Th S. Cwiok and W. Nazarewicz, Phys. Lett. B 224, 5 (1989) June 3, 2013 INPC 2013: Sujit Tandel

Evolution of quadrupole and octupole collectivity Centre for Basic Sciences, Mumbai Evolution of quadrupole and octupole collectivity 221Th MOI for –ve parity higher than +ve parity: larger underlying quadrupole deformation (confirmed by self-consistent Hartree Fock) Octupole collectivity in 221Th increases, then stays constant, while quadrupole deformation increases at highest spins June 3, 2013 INPC 2013: Sujit Tandel

E2 and E3 moments in A≈220 region Centre for Basic Sciences, Mumbai E2 and E3 moments in A≈220 region June 3, 2013 INPC 2013: Sujit Tandel

Contributions from higher-order deformations Centre for Basic Sciences, Mumbai Contributions from higher-order deformations Dotted line: average deformation path Equilibrium deformations for calculated 1-qp bandheads with W<9/2 in odd-A (≈220) nuclei S. Cwiok, W. Nazarewicz, Nucl. Phys. A 529, 95 (1991) June 3, 2013 INPC 2013: Sujit Tandel

Predicted neutron and proton band crossings Centre for Basic Sciences, Mumbai Predicted neutron and proton band crossings Woods-Saxon potential with “universal” parameters Strong octupole collectivity correlated with delay or absence of nucleon alignments Neutron alignment for i11/2 blocked; j15/2 orbital far from Fermi surface for b3≈0.1 Proton i13/2 alignment expected beyond 0.25 MeV Observed increase in moment of inertia at high spins in yrast structure may be due to larger quadrupole deformation. June 3, 2013 INPC 2013: Sujit Tandel

Centre for Basic Sciences, Mumbai Summary Yrast octupole structure in 221Th modified and extended to high spins; new, non-yrast alternating parity sequence identified Parity doublets absent in odd mass 221Th due to low-K value of ground-state configuration Negative parity states have higher moment of inertia arising from larger underlying quadrupole deformation Dynamic variation in both quadrupole deformation and octupole collectivity as a function of angular momentum observed June 3, 2013 INPC 2013: Sujit Tandel

INGA Collaboration S.K. Tandel, M. Hemalatha, A.Y. Deo, S.B. Patel Centre for Basic Sciences, Mumbai Collaboration S.K. Tandel, M. Hemalatha, A.Y. Deo, S.B. Patel UM-DAE Centre for Excellence in Basic Sciences, Mumbai R. Palit, T. Trivedi, J. Sethi, S. Saha Tata Institute of Fundamental Research, Mumbai D.C. Biswas, S. Mukhopadhyay Bhabha Atomic Research Centre, Mumbai INGA June 3, 2013 INPC 2013: Sujit Tandel