Osmium isotopes with the (p,t) reaction

Journal Article · Tue Jun 01 04:00:00 EDT 1976 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.13.2288· OSTI ID:7282038

Sharma, H L; Hintz, N M

The (p, t) reaction at E/subp/=19.0 MeV has been used to study five isotopes of Os (A=190, 188, 184, 187, 185) which lie in a transition region between the deformed rare earths and spherical nuclei. Cross sections and angular distributions have been measured to states up to about 2 MeV of excitation in all cases except /sup 188/Os and /sup 190/Os in which states were seen up to 4 MeV. The energies of the J/sup pi/=0/sup +/ states which we see and their summed cross sections in percent of the ground state (in parenthesis) are: 913 (4.7), 1551 (1.8), and 1734 keV (6.3) in /sup 190/Os, 1087 (5.7), 1480 (3.7), 1705 (1.2), and 1765 keV (<1) in /sup 188/Os, and 1042 (8.4) and tentatively 1982 (1.2) and 2268 keV (1.3) in /sup 184/Os. The L=0 transitions seen in the odd isotopes are at 9.8, 77, 730, and 1657 keV in /sup 187/Os and 1070 and 1213 keV in /sup 185/Os. The results show no positive evidence for the existence of strongly populated shape isomeric 0/sup +/ states similar to those seen in the transition region around N=88. In /sup 188/,/sup 190/Os and possibly /sup 192/Os the lowest exicted K=0 and K=4 bands have the properties expected for two-phonon ..gamma..-vibrations. In addition to the rotational excitations in the odd isotopes, two strong transitions have been seen to states at 599 and 802 keV in /sup 185/Os which we have postulated to be the vertical-barK/sub 0/ +- 2vertical-bar ..gamma.. vibrations based on the 1/2/sup -/510 state with admixed one quasiparticle components. Similar states have been seen in /sup 187/Os. The lowest L=0 transfers to states in /sup 185/,/sup 187/Os were found to have significantly lower intensity than the ground states in the adjacent even-N nuclei. In the case of /sup 187/Os the low lying L=0 strength is split between two states. Calculations have been made to understand these phenomena in terms of blocking effects and Coriolis mixing. (AIP)

• Research Organization: J. H. Williams Laboratory of Nuclear Physics, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 7282038
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 13:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651925* -- Nuclear Properties &amp; Reactions
A=190-219
Experimental-- Nuclear Reactions &amp; Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DIRECT REACTIONS
DWBA
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HADRON REACTIONS
HEAVY NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
OSMIUM 184
OSMIUM 185
OSMIUM 186 TARGET
OSMIUM 187 TARGE
OSMIUM 187 TARGET
OSMIUM 188
OSMIUM 189 TARGET
OSMIUM 190
OSMIUM 190 TARGET
OSMIUM 192 TARGET
OSMIUM ISOTOPES
PICKUP REACTIONS
PROTON REACTIONS
RADIOISOTOPES
STABLE ISOTOPES
TARGETS
TRANSFER REACTIONS
TWO-NUCLEON TRANSFER REACTIONS