New results on superdeformed bands in Hg and Tl nuclei

Conference · Tue Dec 31 23:00:00 EST 1991

OSTI ID:6942011

Carpenter, M P; Janssens, R V.F.; Liang, Y; Ahmad, I; Henry, R G; Khoo, T L; Lauritsen, T; Soramel, F ^[1]; Bearden, I G ^[2]; Drigert, M W ^[3]; Garg, U; Reviol, W ^[4]; Lewis, J M; Riedinger, L

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1. Argonne National Lab., IL (United States)
2. Purdue Univ., Lafayette, IN (United States). Dept. of Physics
3. EG and G Idaho, Inc., Idaho Falls, ID (United States)
4. Notre Dame Univ., IN (United States). Dept. of Physics

New results have been obtained on superdeformed states in [sup 190]Hg, [sup 191]Tl, and [sup 192]Tl. For [sup 190]Hg, the previously identified superdeformed band has been extended up to a rotational frequency of [Dirac h][omega] [ge] 0.40 MeV by combining data from several different experiments. The extracted dynamical moment of inertia J([sup 2]) vs [Dirac h][omega] exhibits a distinct change in slope at [Dirac h][omega] = 0.32 MeV. For [sup 191]Tl and [sup 192]Tl, two and six superdeformed bands have been identified in these nuclei, respectively. Six of these eight bands exhibit a smooth rise in J([sup 2]) with [Dirac h][omega] characteristic of the other superdeformed bands identified in this mass region while the remaining two bands which are in [sup 192]Tl show a constant J([sup 2]) with [Dirac h][omega]. This new result can be understood in terms of Pauli blocking of quasiparticle alignments in high-N intruder orbitals. The new result for [sup 190]Hg is interpreted as evidence of a band interaction at the highest frequencies due to the rotational alignment of a pair of quasiparticles into these same intruder orbitals. These two new features taken together represent the first conclusive evidence that the alignment of intruders is responsible for the smooth rise in J([sup 2]) seen in the other superdeformed bands of this mass region.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; NSF; USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38; FG02-87ER40346; AC07-76ID01570; FG05-87ER40361
• OSTI ID: 6942011
• Report Number(s): ANL/PHY/CP-76390; CONF-9210249--9; ON: DE93008652; CNN: PHY91-00688
• Country of Publication: United States
• Language: English

Related Subjects

663110* -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DEFORMATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
GAMMA SPECTRA
HEAVY NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MERCURY 190
MERCURY ISOTOPES
MINUTES LIVING RADIOISOTOPES
MOMENT OF INERTIA
NUCLEAR DEFORMATION
NUCLEAR STRUCTURE
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SPECTRA
THALLIUM 191
THALLIUM 192
THALLIUM ISOTOPES