The origin and distribution of the E1 strength over low-lying states in well-deformed nuclei

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physics of Atomic Nuclei

OSTI ID:102832

Soloviev, V G; Sushkov, A V ^[1]

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1. Joint Institute for Nuclear Research, Dubna (Russian Federation)

The energies and wave functions of the K{sup {pi}} = 0{sup {minus}} and 1{sup {minus}} states in {sup 158}Gd, {sup 162,164}Dy, and {sup 168}Er are calculated in the RPA, taking the isoscalar and isovector particle-hole and particle-particle octupole and isovector particle-hole dipole interactions into account. It is shown that the inclusion of the isovector dipole interaction in addition to the octupole interactions leads to the shift of the largest part of the E1 strength from low-lying states to the GDR. The origin of the E1 strength in the low-energy region is explained as an effect of the quadrupole equilibrium deformation and isoscalar octupole and isovector dipole interactions. At excitation energies below 4 MeV, the total E1 strength for K{sup {pi}} = 0 states is 3 to 4 times as large as that for the K{sup {pi}} = 1{sup {minus}} states. The fragmentation of the one-phonon K{sup {pi}} = 0{sup {minus}} and 1{sup {minus}} states in {sup 164}Dy and {sup 168}Er due to coupling with the two-phonon configuration is calculated. The B(E1) values for the first K{sub v}{sup {pi}} = 0{sub 1}{sup {minus}} states are 3-5 times as large as the experimental values. The concentration of the E1 strength over the K{sup {pi}} = 0{sup {minus}} states at energies 2.6-3.5 MeV in {sup 168}Er and 3.6-3.9 MeV in {sup 164}Dy is predicted. 45 refs., 2 figs., 4 tabs.

• OSTI ID: 102832
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 8 Vol. 57; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DEFORMED NUCLEI
DYSPROSIUM 162
DYSPROSIUM 164
E1-TRANSITIONS
ERBIUM 168
GADOLINIUM 158
NUCLEAR MODELS
NUCLEAR STRUCTURE
VIBRATIONAL STATES
WAVE FUNCTIONS