Radiochemical investigations of nuclear properties. Progress report, 1 October 1974--30 September 1975

Technical Report · Mon Sep 01 04:00:00 EDT 1975

DOI:https://doi.org/10.2172/4130891· OSTI ID:4130891

Daly, P J

Further studies of the structure of nuclei in the A = 180-200 shape transitional region have been performed. The principal project completed during the current year was an extensive in-beam $gamma$-ray investigation of high-spin levels in the nine nuclei $sup 186$Pt to $sup 194$Pt by ($alpha$,xn$gamma$) reactions on enriched Os targets. Acute backbending observed in the positive parity yrast sequences of $sup 188$$,$$sup 190$$,$$sup 192$$,$$sup 194$Pt has been attributed to the intersection of rotation-aligned ($nu$i-$sup 2$/sub 13/2/) and ($pi$$h$$sup -2$/sub 11/2/) bands with the ground bands. In all four odd-A Pt nuclei, decoupled $nu$$i$$sup -1$/sub 13/2/ bands and many other low-lying high- spin positive parity levels have been established, and low-spin positive parity levels have been located in complementary decay studies. A model of an i/sub 13/ 2/ neutron hole coupled to a triaxially deformed core has been found to be rather successful in reproducing these complex level spectra. Other topics dealt with include new $mu$s isomers in $sup 187$$,$$sup 189$$,$$sup 191$Pt, the decays of $sup 191$Au, /sup 194m/Ir and 1.7 h $sup 186$Ir and the level structure of $sup 191$Au from an $sup 191$Ir(alpha,4n$gamma$) study. (auth)

• Research Organization: Purdue Univ., Lafayette, Ind. (USA). Dept. of Chemistry
• NSA Number: NSA-33-008542
• OSTI ID: 4130891
• Report Number(s): COO--1672-61
• Country of Publication: United States
• Language: English

Related Subjects

*OSMIUM ISOTOPES-- ENERGY LEVELS
*PLATINUM 186-- ENERGY LEVELS
*PLATINUM 187-- ENERGY LEVELS
*PLATINUM 188-- ENERGY LEVELS
*PLATINUM 189-- ENERGY LEVELS
*PLATINUM 190-- ENERGY LEVELS
*PLATINUM 191-- ENERGY LEVELS
*PLATINUM 192-- ENERGY LEVELS
*PLATINUM 193-- ENERGY LEVELS
*PLATINUM 194-- ENERGY LEVELS
643205*
DECAY-- GOLD 191
GAMMA RADIATION
GOLD 191-- IRIDIUM 191
HIGH SPIN STATES
IRIDIUM 186
N68931 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
190 <= A <= 219--Energy Levels & Transitions
N68951* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
190 <= A <= 219--Nuclear Reactions & Scattering
NEUTRONS
YRAST STATES IRIDIUM 194-- ISOMERIC NUCLEI