New results on superdeformed bands in Hg and Tl nuclei

Conference · Thu Dec 31 00:00:00 EST 1992

OSTI ID:10135893

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 L; Yu, C H ^[5]; Pilotte, S ^[6]

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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
5. Tennessee Univ., Knoxville, TN (United States). Dept. of Physics
6. Ottawa Univ., ON (Canada). 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: 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: 10135893
• Report Number(s): ANL/PHY/CP-76390; CONF-9210249-9; ON: DE93008652; CNN: Grant PHY91-00688
• Resource Relation: Conference: 1992 international symposium on rapidly rotating nuclei,Tokyo (Japan),26-30 Oct 1992; Other Information: PBD: [1992]
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
MERCURY 190
NUCLEAR DEFORMATION
NUCLEAR STRUCTURE
THALLIUM 191
THALLIUM 192
MOMENT OF INERTIA
GAMMA SPECTRA
ENERGY-LEVEL TRANSITIONS
663110
663580
GENERAL AND AVERAGE PROPERTIES OF NUCLEI AND NUCLEAR ENERGY LEVELS
A = 190-219