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

Journal Article · Wed Dec 15 00:00:00 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, Vol. 82, Issue 6; Other Information: DOI: 10.1103/PhysRevC.82.064308; (c) 2010 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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