Four-valence-proton yrast states in 1 /sub 68//sup 50/Er/sub 82/

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.29.2153· OSTI ID:6620153

Chung, Y H; Daly, P J; Helppi, H; Broda, R; Grabowski, Z W; Kortelahti, M; McNeill, J; Pakkanen, A; Chowdhury, P; Janssens, R V.F.; Khoo, T L; Blomqvist, J

The level structure of the four-valence-proton N = 82 nucleus /sup 150/Er has been studied by ..gamma..-ray spectroscopy following reactions of 225--255 MeV /sup 58,60/Ni beams on /sup 92,94,95/Mo and /sup 93/Nb targets. Yrast levels in /sup 150/Er are established up to 9.5 MeV excitation energy; they include isomeric levels at 2797, 7372, and 9509 keV. The observed levels up to 5222 keV are interpreted in terms of shell model configurations involving the four valence protons outside the /sup 146/Gd core. They include states with dominant seniority two and four configurations ..pi..h/sub 11/2//sup 4/, ..pi..h/sub 11/2//sup 3/s/sub 1/2/, and ..pi..h/sub 11/2//sup 3/d/sub 3/2/, and octupole excitations. The levels above 5222 keV must involve excitation of the /sup 146/Gd core, and they are not interpreted in detail. The energies of the ..pi..h/sub 11/2//sup 4/ levels are found to agree reasonably with predictions based on empirical two-body interactions taken from the ..pi..h/sub 11/2//sup 2/ spectrum of /sup 148/Dy. Even better agreement is obtained by taking account also of the known ..pi..h/sub 11/2//sup 3/ energies in /sup 149/Ho. The dependence of E2 transition probabilities in N = 82 nuclei on the ..pi..h/sub 11/2/ subshell occupation number is discussed.

• Research Organization: Purdue University, West Lafayette, Indiana 47907
• OSTI ID: 6620153
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 29:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651725* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651823 -- Nuclear Properties & Reactions
A=150-189
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
DATA
DAYS LIVING RADIOISOTOPES
E2-TRANSITIONS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
ERBIUM 150
ERBIUM ISOTOPES
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
GADOLINIUM 146
GADOLINIUM ISOTOPES
GAMMA SPECTROSCOPY
HADRONS
HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MOLYBDENUM 92 TARGET
MOLYBDENUM 94 TARGET
MOLYBDENUM 95 TARGET
MULTIPOLE TRANSITIONS
NICKEL 58 REACTIONS
NICKEL 60 REACTIONS
NIOBIUM 93 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
PARITY
PARTICLE PROPERTIES
PROTONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SHELL MODELS
SPECTROSCOPY
SPIN
TARGETS
YRAST STATES