Structure studies of low-lying O/sup plus/ states in the deformed rare-earth region

Conference · Tue Nov 01 00:00:00 EST 1988

OSTI ID:6454599

Shihab-Eldin, A A; Rasmussen, J O; Stoyer, M

To better understand the structure of the low lying O/sup +/ states of even-even nuclides in the deformed rare-earth region, we have carried out calculations to generate the wavefunctions, energies and pair transfer rates from/to these states within a framework of exact diagonalization of the residual pairing and n-p forces. First we carried out exact diagonalization for the neutron and proton systems separately, using as a basis space the 126 vector space of four/five pairs within nine appropriate deformed Nilsson orbitals. For the pairing force we included both monopole and quadrupole terms. Next, we used the lowest eight eigenfunctions from both the neutron and the proton systems to generate a new basis space composed of the 64 possible neutron-proton product vectors. The n-p force was approximated by a quadrupole-quadrupole force term which was then diagonalized within the new basis space. The resulting wave functions were used to calculate the neutron pair transfer strength from and to the various low O/sup +/ states below 3 MeV in the even-even Gd, Dy and Er isotopes. Furthermore, for the case where the deformation parameters do not change appreciably between the pair of nuclides involved in the pair transfer reaction, reasonable global agreement was obtained for the measured (t,p) and (p,t) pair transfer reaction strengths both to the ground and excited states O/sup +/ states accessible in these isotopes. The observed enhancement of (t,p) pair transfer strength to excited states in some of these isotopes was reproduced by the calculation. The enhancement is due to subshell gap and large relative pair transfer amplitude for an orbital near the Fermi surface. 24 refs., 7 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6454599
• Report Number(s): LBL-26225; CONF-881054-47; ON: DE89006649
• Resource Relation: Conference: 4. annual DOE model conference, Oak Ridge, TN, USA, 3 Oct 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DYSPROSIUM 164 TARGET
PROTON REACTIONS
ERBIUM 164 TARGET
ERBIUM 166 TARGET
ERBIUM 168 TARGET
DEFORMED NUCLEI
EXCITED STATES
GADOLINIUM ISOTOPES
HAMILTONIANS
NUCLEAR STRUCTURE
RARE EARTHS
THEORETICAL DATA
TRANSFER REACTIONS
WAVE FUNCTIONS
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
DATA
DIRECT REACTIONS
ELEMENTS
ENERGY LEVELS
FUNCTIONS
HADRON REACTIONS
INFORMATION
ISOTOPES
MATHEMATICAL OPERATORS
METALS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
QUANTUM OPERATORS
RARE EARTH ISOTOPES
TARGETS
653001* - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models
653003 - Nuclear Theory- Nuclear Reactions & Scattering