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/sup 109/Pd: Difficulties in particle-rotor models for unique-parity states and revision of spectroscopic factors

Journal Article · · Phys. Rev., C; (United States)
; ; ; ; ; ; ; ; ; ;
Primary and secondary ..gamma.. rays following thermal and p-wave resonant (2.96 eV) neutron capture on /sup 108/Pd were measured to study ..gamma..-ray transitions in /sup 109/Pd. Average resonance capture spectra at 2 and 24 keV were also recorded and the /sup 108/Pd(n,..gamma..ce) reaction was studied and transition multipolarities were deduced. A detailed level scheme up to approx. 1400 keV has been constructed. Numerous spin assignments have been revised, leading to substantial changes in the (d,p) and (d,t) spectroscopic factors, in particular for the g/sub 7/2/ orbit. The data on primary transition intensities for the 2.96 eV resonance are compared with the valence neutron capture model. The level scheme deduced for /sup 109/Pd sheds new light on the previously proposed g/sub 7/2/-h/sub 11/2/ anomaly in the filling of these orbits, suggesting that, at least in /sup 109/Pd, the appearance of the anomaly was largely due to spin misassignments. The revised systematics in the occupation of shell model orbits for a number of nuclei in this mass region is reviewed. Within the level scheme is a group of low-spin negative-parity levels which belong to the same family as the high-spin, decoupled, unique-parity states known in other odd mass Pd isotopes. These states correspond to the favored and unfavored anti-aligned levels for core rotations R < or = 6. Calculations in the framework of the particle-rotor model cannot reproduce these level energies.
Research Organization:
Brookhaven National Laboratory, Upton, New York 11973
OSTI ID:
5541270
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:1; ISSN PRVCA
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CHARGED-PARTICLE REACTIONS
DEUTERON REACTIONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FERMIONS
HADRON REACTIONS
HADRONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
MULTIPOLARITY
NEUTRON REACTIONS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ONE-NUCLEON TRANSFER REACTIONS
P WAVES
PALLADIUM 108 TARGET
PALLADIUM 109
PALLADIUM ISOTOPES
PARITY
PARTIAL WAVES
PARTICLE PROPERTIES
RADIOISOTOPES
SHELL MODELS
SPECTROMETERS
SPECTROSCOPIC FACTORS
SPIN
TARGETS
THERMAL NEUTRONS
TRANSFER REACTIONS