Low-energy pionic double charge exchange on the {beta}{beta}-instable nuclei {sup 128,130}Te
- Physikalisches Institut der Universitaet Tuebingen, Morgenstelle 14, D-72076 Tuebingen (Germany)
- Institut fuer Experimentelle Kernphysik der Univ. Karlsruhe, Postfach 3640, D-76021 Karlsruhe (Germany)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Paul Scherrer Institut, CH-5232 Villigen (Switzerland)
Data of the ({pi}{sup +},{pi}{sup {minus}}) reaction on {sup 128}Te and {sup 130}Te at {ital T}{sub {pi}}=48 MeV are presented, which constitute also the first observation of pionic double charge exchange (DCX) on heavy nuclei at energies below the (3,3) resonance. For the ground state transitions in these isotopes we find very small cross sections of about 15 nb/sr only at 30{degree} and a ratio of {sigma}({sup 130}Te)/{sigma}({sup 128}Te)=1.5{sub {minus}0.8}{sup +1.8}. The experimental results and their impact on the understanding of the {beta}{beta} decay of the Te isotopes are discussed within the framework of recent proton-neutron quasiparticle random phase approximation calculations. For the transitions to the double isobaric analog states in {sup 128}Xe and {sup 130}Xe we obtain cross sections in the range 1 {mu}b/sr which fit very well into a systematics, that is in accordance with a dominance of the short-range part of the DCX operator in analog transitions at low pion energies. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 283999
- Journal Information:
- Physical Review, C, Vol. 53, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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