The study of exotic N approx equal 82 nuclei using the Daresbury recoil mass separator

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5459975

McNeill, J H; Chishti, A A; Gelletly, W; Hotchkis, M A.C.; Varley, B J; Blomqvist, J; Daly, P J; Piiparinen, M; Woods, P J ^[1]

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1. Oak Ridge National Lab., TN (USA)

Experiments using the Daresbury Recoil Mass Separator have identified microsecond isomers in the exotic N {equals} 82, 83 nuclei {sup 153}Yb, {sup 153}Lu, {sup 154}Hf, and have established their decay schemes. The results for {sup 153}Lu and {sup 154}Hf, together with those for lighter N {equals} 82 isotones, provide an outstanding illustration of the dependence of E2 transition rates between J{sup n} states on the subshell occupation, and demonstrate that half-filling of the {pi}h{sub 11/2} subshell in the N {equals} 82 series occurs just below Z {equals} 71 {sup 153}Lu. The result of the isomer in the even-odd N {equals} 83 nucleus {sup 153}Yb shows that the isomerism is due to a low-energy E2 transition rather than an E3 transition as in lighter N {equals} 83 even-odd isotones, which is another consequence of the {pi}h{sub 11/2} subshell being about half-filled. Furthermore, the long-lived isomer observed in the odd-odd N {equals} 83 nucleus {sup 154}Lu also reflects that the {pi}h{sub 11/2} subshell is close to being half-filled. 23 refs., 12 figs., 4 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: ACADFI; DOE/ER; UKSERC
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5459975
• Report Number(s): CONF-890902-20; ON: DE90001079
• Country of Publication: United States
• Language: English

Related Subjects

651820* -- Nuclear Properties & Reactions
A=150-189
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CROSS SECTIONS
DECAY
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXOTIC RESONANCES
GAMMA SPECTRA
HADRONS
HAFNIUM 154
HAFNIUM ISOTOPES
INTERMEDI
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTONIC NUCLEI
ISOTOPES
LUTETIUM 153
LUTETIUM 154
LUTETIUM ISOTOPES
MICROSEC LIVING RADIOISOTOPES
MILLISEC LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RESONANCE PARTICLES
SECONDS LIVING
SECONDS LIVING RADIOISOTOPES
SPECTRA
TRANSITION AMPLITUDES
YRAST STATES
YTTERBIUM 153
YTTERBIUM ISOTOPES