Shape coexistence near the Z-82 closed shell: a study of the excited states of /sup 187/Au and /sup 187/Pt in the. beta. /sup +/ decay of /sup 187/Hg and /sup 187/Au

Technical Report · Wed Nov 01 04:00:00 EST 1978

DOI:https://doi.org/10.2172/5771647· OSTI ID:5771647

Grimm, Jr., M. A.

The decays of mass-separated (2.4, 2.2 min)/sup 187m,g/Hg and (8.4 min)/sup 187/Au were studied. Both high- and low-spin states in /sup 187/Au are fed in the (..beta../sup +/, EC) decay of /sup 187m,g/Hg isomers. The h/sub 11/2/, h/sub 9/2/, s/sub 1/2/, d/sub 3/2/, and d/sub 5/2/ collective bands, which are systematically observed throughout the odd-mass gold isotopes, are now extended to /sup 187/Au. In /sup 187/Au, the h/sub 9/2/ bandhead is below the h/sub 11/2/ bandhead, and the transition between the two is found to proceed via a hindered M1 transition due to the change in nuclear shape involved in the transition. One of the most important results of the present study is the discovery of the coupling of the odd proton in an h/sub 9/2/ particle state to the excited O/sup +/ state of the /sup 186/Pt core. Only the low spin states in /sup 187/Pt appear to be populated in the beta decay of /sup 187/Au. The nature of these low-spin states is not understood at present. One aspect of the levels of /sup 187/Pt not previously reported is a delayed transition of 251 keV energy observed in the present study. 111 references.

• Research Organization: Georgia Inst. of Tech., Atlanta (USA)
• DOE Contract Number: EY-76-C-05-0033
• OSTI ID: 5771647
• Report Number(s): ORO-3346-229
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
COINCIDENCE METHODS
COLLECTIVE MODEL
CONFIGURATION
COUNTING TECHNIQUES
COUPLING
DATA
DATA FORMS
DECAY
DELAYED GAMMA RADIATION
DIPOLE MOMENTS
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
GAMMA RADIATION
GAMMA SPECTRA
GOLD 187
GOLD ISOTOPES
GRAPHS
HEAVY NUCLEI
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
IONIZING RADIATIONS
ISOLATED VALUES
ISOMERIC NUCLEI
ISOTOPES
LIFETIME
MAGNETIC DIPOLE MOMENTS
MAGNETIC MOMENTS
MATHEMATICAL MODELS
MERCURY 187
MERCURY ISOTOPES
MINUTES LIVING RADIOISOTOPES
NILSSON-MOTTELSON MODEL
NUCLEAR MODELS
NUCLEAR STRUCTURE
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PLATINUM 187
PLATINUM ISOTOPES
PROBABILITY
RADIATIONS
RADIOISOTOPES
SHAPE
SPECTRA
SPIN
VIBRATIONAL STATES