Pygmy Dipole Strength in Exotic Nuclei and the Equation of State

SPECTROSCOPIC FEATURES OF LOW-ENERGY EXCITATIONS IN SKIN NUCLEI

Modern Physics Letters A ◽

10.1142/s0217732310000319 ◽

2010 ◽

Vol 25 (21n23) ◽

pp. 1779-1782 ◽

Cited By ~ 6

Author(s):

NADIA TSONEVA ◽

HORST LENSKE

Keyword(s):

Fine Structure ◽

Dynamic Properties ◽

Exotic Nuclei ◽

Low Energy ◽

Close Connection ◽

Dipole Strength ◽

Spin Flip

Systematic studies of dipole and other multipole excitations in stable and exotic nuclei are discussed theoretically. Exploring the relation of the strengths of low-energy dipole and quadrupole pygmy resonances to the thickness of the neutron (proton) skin a close connection between static and dynamic properties of the nucleus is observed. The fine structure of low-energy dipole strength in 138 Ba nucleus is revealed from E1 and spin-flip M1 strengths distributions.

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Pygmy Dipole Strength and Neutron Skins in Exotic Nuclei

10.1063/1.2939304 ◽

2008 ◽

Author(s):

A. Klimkiewicz ◽

N. Paar ◽

P. Adrich ◽

M. Fallot ◽

K. Boretzky ◽

...

Keyword(s):

Exotic Nuclei ◽

Dipole Strength

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Monte Carlo Algorithms for Moments of Transition Arrays

International Astronomical Union Colloquium ◽

10.1017/s0252921100107468 ◽

1988 ◽

Vol 102 ◽

pp. 79-81

Author(s):

A. Goldberg ◽

S.D. Bloom

Keyword(s):

Monte Carlo ◽

State Vector ◽

Basis Vector ◽

Collective State ◽

Dispersion Characteristics ◽

Dipole Strength ◽

The Third ◽

Monte Carlo Algorithms ◽

Third Moment ◽

Very High

AbstractClosed expressions for the first, second, and (in some cases) the third moment of atomic transition arrays now exist. Recently a method has been developed for getting to very high moments (up to the 12th and beyond) in cases where a “collective” state-vector (i.e. a state-vector containing the entire electric dipole strength) can be created from each eigenstate in the parent configuration. Both of these approaches give exact results. Herein we describe astatistical(or Monte Carlo) approach which requires onlyonerepresentative state-vector |RV> for the entire parent manifold to get estimates of transition moments of high order. The representation is achieved through the random amplitudes associated with each basis vector making up |RV>. This also gives rise to the dispersion characterizing the method, which has been applied to a system (in the M shell) with≈250,000 lines where we have calculated up to the 5th moment. It turns out that the dispersion in the moments decreases with the size of the manifold, making its application to very big systems statistically advantageous. A discussion of the method and these dispersion characteristics will be presented.

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