Depopulation of [sup 180]Ta[sup [ital m]] by Coulomb excitation and possible astrophysical consequences

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.2198· OSTI ID:6961568

Schlegel, C; von Neumann-Cosel, P; Neumeyer, F; Richter, A; Strauch, S ^[1]; de Boer, J; Dasso, C H ^[2]; Peterson, R J ^[3]

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1. Institut fuer Kernphysik, Technische Hochschule Darmstadt, D-64289 Darmstadt (Germany)
2. Sektion Physik, Universitaet Muenchen, D-85748 Garching (Germany)
3. Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309 (United States)

The depopulation of [sup 180]Ta[sup [ital m]] by Coulomb excitation was investigated in a thick-target experiment using beams of [sup 32]S and [sup 36]S with energies of 70--130 MeV on disks of natural tantalum. The resulting [sup 180]Ta ground-state population was measured by detecting its eight-hour decay. At the higher incident energies the observed [sup 180]Ta yield is dominated by sub-Coulomb neutron pickup transfer reactions on the 10[sup 4] times more abundant [sup 181]Ta. At the lower incident energies in [sup 180]Ta ground-state yield is found to be compatible with Coulomb excitation of the isomer to an intermediate level with energies [ital E][sub [ital x]][lt]1 MeV and a reduced transition probability [ital B]([ital E]2)[congruent]0.02--0.25 Weisskopf units. Consequences for the astrophysical production mechanism of [sup 180]Ta are discussed.

• OSTI ID: 6961568
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
COULOMB EXCITATION
DIRECT REACTIONS
E2-TRANSITIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
GROUND STATES
HEAVY ION REACTIONS
INELASTIC SCATTERING
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
PICKUP REACTIONS
SCATTERING
SULFUR 32 REACTIONS
SULFUR 36 REACTIONS
TANTALUM 180 TARGET
TARGETS
TRANSFER REACTIONS