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Effects of high-order deformation on high-spin structure in the heaviest nuclei accessible by

spectroscopy experiments

刘红亮西安交通大学理学院

2012 年 8 月 兰州

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Introduction

R.-D. Herzberg and P.T. Greenlees, Prog. Part. Nucl. Phys. 61, 674 (2008).

The heaviest nuclei accessible by spectroscopy experiments

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R.-D. Herzberg et al.Nature 442(2006)896

S.K. Tandel et al.Phys. Rev. Lett.97(2006)082502

Hessberger et al.Eur. Phys. J. A43(2010)55 R.M. Clark et al.

Phys. Lett. B 690(2010)19

2-qp isomer

4-qp isomer

JYFL

ANL

GSI

LBNL

Introduction

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Introduction

R.-D. Herzberg et al.,Phys. Rev. C 65, 014303 (2001).

S. Eeckhaudt et al.,Eur. Phys. J. A 26, 227 (2005).

P.T. Greenlees et al.Phys. Rev. Lett. 109, 012501 (2012).

252No 254No 256Rf

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Introduction

Previous theoretical studies

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Introduction

R.-D. Herzberg et al., Phys. Rev. C 65, 014303 (2001).S. Eeckhaudt et al., Eur. Phys. J. A 26, 227 (2005).

Different rotational behaviors observed in 252No and 254No

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β6 deformations

254No

I. Muntian et al.,Phys. Lett. B500, 241 (2001).

Introduction

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Model

total LDM shellE E E

LDME

Configuration-constrained calculationsof potential-energy surfaces

F.R. Xu et al., Phys. Lett. B 435, 257 (1998).

Standard liquid drop model

Strutinsky shell correction calculated fromWoods-Saxon potential and Lipkin-Nogami pairing

traced by

Nuclear shape parametrization

TRIAXIAL

H.L. Liu et al., Phys. Rev. C 83, 011303(R) (2011).

H.L. Liu et al., Eur. Phys. J. A. 47, 135 (2011).

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Model

Total Routhian surface (TRS) calculationof nuclear rotation

A deformation-pairing-frequency self-consistent model

W. Satula and R. Wyss, Phys. Scr., T 56, 159 (1995).F.R. Xu et al., Nucl. Phys. A 669, 119 (2000).H.L. Liu et al., Phys. Rev. C 86, 011301(R) (2012).

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g.s. 8

816

Remarkable and stable β6 deformationsIncreased bindingdue to β6 deformations

Solid lines: Cal. with β6

Dashed lines: Cal. without β6

Calculation of multi-quasiparticle state

H.L. Liu, F.R. Xu, P.M. Walker, and C.A. Bertulani, Phys. Rev. C 83, 011303(R) (2011).

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Calculation of multi-quasiparticle state

Comparison between exp. and cal.

Single-particle levels

H.L. Liu, F.R. Xu, P.M. Walker, and C.A. Bertulani, Phys. Rev. C 83, 011303(R) (2011).

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Calculation of collective rotation

H.L. Liu, F.R. Xu, and P.M. Walker, Phys. Rev. C 86, 011301(R) (2012).

Calculated kinematic moments of inertia (MOIs)

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H.L. Liu, F.R. Xu, and P.M. Walker,Phys. Rev. C 86, 011301(R) (2012).

Calculation of collective rotation

Proton and neutron components of the calculated MOIs

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H.L. Liu, F.R. Xu, and P.M. Walker,Phys. Rev. C 86, 011301(R) (2012).

Calculation of collective rotation

Shape changeswith rotation

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• Significantly improved description of 254No high-K isomers with β6 deformation

• The observed different rotational behaviors of 252No and 254No can be understood in terms of β

6 deformation

Summary

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Thank you!