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Microscopic approach to large-amplitude deformation dynamics with local QRPA inertial functions
Koichi Sato (RIKEN Nishina Center)
Nobuo Hinohara (RIKEN Nishina Center)Takashi Nakatsukasa (RIKEN Nishina Center)Masayuki Matsuo (Niigata Univ.)Kenichi Matsuyanagi (RIKEN Nishina Center/ YITP Kyoto Univ.)
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Contents
KS & Hinohara, Nucl. Phys. A 849, 53 (2011)
Hinohara, KS, Nakatsukasa, Matsuo, Matsuyanagi, PRC 82, 064313 (2010)
KS et al., in preparation
Application to oblate-prolate shape coexistence (72Kr)
Application to shape transition in neutron-rich Cr isotopes around N=40
Summary
Constrained HFB + Local QRPA method
Microscopic determination of inertial functions in the quadrupole collective Hamiltonian
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Shape coexistence
anharmonic effects
spherical
deformed
transitionaltransitional nuclei
deformation
energy
Microscopic approach to large-amplitude collective motion
A new method of determining the 5D quadrupole collective Hamiltonian: Constrained HFB + Local QRPA method
Shape mixing
Beyond small-amplitude approximation
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),(rotvib VTTH 22
vib ),(21),(),(
21 &&&& DDDT
3
1
2rot 2
1k
kkT J
(Generalized Bohr-Mottelson Hamiltonian) :
5D quadrupole collective Hamiltonian
collective potential
vibrational masses
rotational moments of inertia
2 deformation parameters (β, γ)
+ 3 Euler angles Ω
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“CHFB+ LQRPA” method is based on the Adiabatic SCC method
“Constrained HFB+ Local QRPA method”
Matsuo, Nakatsukasa, and Matsuyanagi, Prog.Theor. Phys. 103(2000), 959.N. Hinohara, et al, Prog. Theor. Phys. 117(2007) 451.
LQRPA inertial masses include the contribution from the time-odd components of the mean field unlike the cranking masses.
Hinohara, KS, Nakatsukasa, Matsuo, Matsuyanagi, PRC 82, 064313 (2010)
Moving-frame HFB eq.
Moving-frame QRPA eq.
Constrained HFB eq.
Local QRPA eq.
2q1q
TDHFB phase space
ASCC method CHFB+LQRPA method
),( 21 qqPQ
Collective manifold
sin
cos
),( PQ
Hinohara-san’s talk
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Local QRPA (LQRPA) equations for vibration:
Constrained HFB (CHFB) equation:
Constrained HFB + Local QRPA method
),( V
Local QRPA equations for rotation:
),( kJ
),( D ),( D ),( D
KS & Hinohara, Nucl. Phys. A 849, 53 (2011) Hinohara, KS, Nakatsukasa, Matsuo, Matsuyanagi, Phys. Rev. C 82, 064313 (2010)
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Derivation of vibrational masses
Scale transformation B=1 1q2q
)(0D
)(22 D
collective coordinates
Vibrational part of collective Hamiltonian
In terms of quadrupole deformation
one-to-one correspondence
Quadrupole def.
qiP
1ˆ
Criterion to choose 2 LQRPA modes:
Take a pair which gives the minimal
LQRPA eq.
),(),(ˆ1,ˆ),(),(ˆ),(ˆ
)(2
)(2
)(2
Pi
DDqq
Dmm
m
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Quantized quadrupole collective Hamiltonian):(General Bohr-Mottelson Hamiltonian)
Pauli’s prescription
Classical Quadrupole Collective Hamiltonian:
Collective Schrodinger equation:
Collective wave function:vib. rot.
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Application to oblate-prolate shape coexistence
Collective potential
Model details:Effective interaction: P+Q model including quadrupole-pairing int.Model space: two major shells (Nsh=3,4)Single-particle energy: modified oscillatorInteraction strength: adjusted to reproduce Skyrme-HFB gaps and deformation property
Moment of inertia Vib. inertial mass
KS & Hinohara, Nucl. Phys. A 849, 53 (2011)
Hinohara, KS, Nakatsukasa, Matsuo, Matsuyanagi, Phys. Rev. C 82, 064313 (2010) 68,70,72Se:72,74,76Kr:
72Kr
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Collective wave functions squared x 4
localization
72KrNormalization of w. f.:
4
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Excitation energies and B(E2) values (72Kr)
Time-odd mean field contribution lowers excitation energies
Interband transitions become weaker as angular momentum increases.
EXP:Fischer et al., Phys.Rev.C67 (2003) 064318, Bouchez, et al., Phys.Rev.Lett.90 (2003) 082502.Gade, et al., Phys.Rev.Lett.95 (2005) 022502, 96 (2006) 189901
( ) …B(E2) e2 fm4
effective charge: epol =0.658
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Gade et al., Phys.Rev.C81 (2010) 051304(R),N~40
Experimental 2+ excitation energies & E(41+)/ E(21
+) ratios
onset of deformation?
Development of deformation in Cr isotopes around N~40
Sudden rise in R4/2 from to3660 Cr 38
62 Cr
E(21+) decreases with increasing N toward
N=40
R4/2=E(41+)/ E(21
+) increases with increasing N
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Collective potential
64Cr4062Cr38
60Cr36
),( V
66Cr42
Model details:
Eff. Int. : P+Q model including the quadrupole pairingModel space: 2 major shells
Int. parameters:62Cr adjusted to reproducethe Skyrme-HFB gaps and deformation
Others : simple A -dep. assumed
58Cr34
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LQRPA rotational MoILQRPA vibrational masses:
N=36
N=38
N=40
),( D 2),( D ),(1 J
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A. Bürger et al., PLB 622 (2005) 29
)2( 1E )2()4( 11
EE
S. Zhu et al., Phys. Rev. C74 (2006) 064315.
)02;2( 11 EB
(en, ep) =(0.5, 1.5)
Application to Cr isotopes
)2( 1Q
N. Aoi et al., PRL 102, 012502 (2009)EXP:Gade et al., Phys.Rev.C81 (2010) 051304(R),
)4( 1E&
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Collective wave functions squared4
KIK
2),(
N=36
N=34
N=38
N=40
N=42
(ground band)
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Summary
Application to shape mixing dynamics
oblate-prolate shape coexistence in 72Kr
shape transition in neutron-rich Cr isotopes around N=40.
role of rotational motion
LQRPA inertial masses contain the contribution from the time-odd component of the mean field, which increases the inertial masses.
We have proposed a method (CHFB+LQRPA method) for determining the inertial functions in the 5D quadrupole collective Hamiltonian.
2D CHFB +LQPRA method with Skyrme EDF
Future work