LEVELS IN Dy$sup 164$ FROM DEUTERON STRIPPING AND INELASTIC PROTON SCATTERING EXPERIMENTS

Journal Article · Mon Feb 10 00:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.133.B624· OSTI ID:4115794

Shelton, W N; Sheline, R K

Protons and deuterons with energies 12.5 and 12.0 Mev, respectively, were used to study the levels in Dy/sup 164/ at a number of angles via the reactions Dy/sup 164/(p,p')Dy/sup 164/ and Dy/sup 163/(d,p)Dy/sup 164/. The ground-state Q value for the latter reaction was determined as 5434 plus or minus 5 kev. The agreement in energy between the proton groups observed in both reactions and the nuclear models of Bohr and Monelson and Davydov allows the assignment of ground-state and gamma vibrational bands. These assignments are (in kev) G.S. (0/sup +/), 72 (2/sup +/), 240 (4/sup +/), 503 (6/sup +/), 761 (2/ sup +/), 827 ( 3/sup +/), 919 (4/sup +/), 1040 (5/sup +/), and, with less certainty, 1157 (6/sup +/). Cross sections for excitation of the gamma band by the (d,p) reaction are similar to those of the G.S. band, whereas no excitation of a BETA vibrational band is observed. The 6-- two-quasiparticle state, formed from the coupling of the 5/2-- STA523! and 7/2 STA633! neutron states, and the 7-- member of the superimposed rotational band are probably the weak states at 1680 and 1853 kev, respectiveiy. The 2/sup +/ two-quasiparticle state formed from the coupling of the 5/2- STA523! and 1/2-- STA521! neutron states and the members of the associated rotational band were probably observed. They are: 1987 (2/sup +/), 2058 (3/sup +/), 2158 (4/sup +/), 2266 (5/sup +/), and 2418 (6/sup +/ ). The collective nature of the ground-state and gamma vibrational bands in Dy/ sup 164/ is clearly indicated by very small cross sections for the (d,p) reactions and relatively large cross sections for the (p,p') reaction. The energy gap corresponding to breaking a neutron pair is observed as a dramatic increase in the (d,p) cross section. A useful selection rule for (d,p) stripping predicted by Satchler is clearly verified experimentally. (auth)

• Research Organization: Florida State Univ., Tallahassee
• NSA Number: NSA-18-009392
• OSTI ID: 4115794
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 133; Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

PHYSICS
ANGULAR DISTRIBUTION
BOHR-MOTTELSON MODEL
COLLECTIVE MODEL
CROSS SECTIONS
DEUTERON BEAMS
DIRECT REACTIONS
DYSPROSIUM 163
DYSPROSIUM 164
ENERGY
ENERGY LEVELS
ENERGY RANGE
EXCITATION
GAMMA RADIATION
MEV RANGE
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
OSCILLATIONS
PARITY
PROTON BEAMS
Q-VALUE
QUANTUM MECHANICS
ROTATION
SCATTERING
SELECTION RULES
SPECTRA
SPIN
TRANSIENTS