Near-yrast, medium-spin structure of the {sup 109}Tc nucleus

Journal Article · Wed Dec 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.064308· OSTI ID:21499260

Urban, W ^[1]; Pinston, J A ^[2]; Rzaca-Urban, T; Kurpeta, J ^[3]; Smith, A G ^[4]; Ahmad, I ^[5]

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1. Institut Laue-Langevin, 6 rue J. Horowitz, F-38042 Grenoble Cedex 9 (France)
2. Laboratoire de Physique Subatomique et de Cosmologie, Universite Joseph Fourier Grenoble 1, Centre National de la Recherche Scientifique/Institut National de Physique Nuclaire et de Physique des Particules, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex (France)
3. Faculty of Physics, University of Warsaw, ul. Hoza 69, PL-00-681 Warsaw (Poland)
4. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)
5. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Excited levels in the {sup 109}Tc nucleus, populated in the spontaneous fission of {sup 248}Cm, have been studied using the EUROGAM2 array. In {sup 109}Tc we have found a new band corresponding to the {pi}5/2{sup -}[303] configuration and a three-quasiparticle band with I{sup {pi}}=(15/2{sup -}) band-head level at 1749.5 keV. The structure of the 1749.5-keV level probably involves the {l_brace}{pi}5/2{sup +}[422]{nu}(5/2{sup -}[532],5/2{sup +}[413]){r_brace}{sub 15/2}{sup -} prolate configuration. The quasiparticle-rotor model calculations performed in this work show that the odd-proton configurations observed in {sup 107}Tc and {sup 109}Tc are consistent with the scheme of proton excitations in a prolate triaxial potential. Significant differences between the degree of triaxiality observed for positive- and negative-parity excitations may be due to blocking of the triaxial shape by the odd proton populating negative-parity orbitals. The properties of the new 494.5-, 1440.7-, and 1748.8-keV levels found in {sup 109}Tc may indicate a change toward an oblate shape in this nucleus.

• OSTI ID: 21499260
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHANNELING
COMPUTERIZED SIMULATION
CONFIGURATION
CURIUM 248
CURIUM ISOTOPES
DECAY
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
EXCITED STATES
FERMIONS
FISSION
HADRONS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
ISOTOPES
KEV RANGE
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROTONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SIMULATION
SPIN
SPONTANEOUS FISSION
SPONTANEOUS FISSION RADIOISOTOPES
TECHNETIUM 107
TECHNETIUM 109
TECHNETIUM ISOTOPES
YEARS LIVING RADIOISOTOPES