Low-lying structures in the Gamow-Teller strength functions for the double-beta-decaying nuclei sup 76 Ge, sup 82 Se, sup 128 Te, and sup 130 Te

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.540· OSTI ID:5539668

Madey, R; Flanders, B S; Anderson, B D; Baldwin, A R; Watson, J W ^[1]; Austin, S M ^[2]; Foster, C C ^[3]; Klapdor, H V ^[3]; Grotz, K ^[4]

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1. Department of Physics, Kent State University, Kent, Ohio 44242 (US)
2. Department of Physics and Astronomy and Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
3. Indiana University Cyclotron Facility, Bloomington, Indiana 47405
4. Max-Planck-Institut fur Kernphysik, Heidelberg, Federal Republic of Germany

Excitation-energy distributions of transition strength to 1{sup +} states excited via the ({ital p},{ital n}) reaction at 134.4 MeV on targets of {sup 76}Ge, {sup 82}Se, {sup 128}Te, and {sup 130}Te were measured for excitation energies up to 25 MeV. Structures observed in the neutron spectra with forward-peaked ({Delta}{ital L}=0) angular distributions were identified as 1{sup +} states, except for the isobaric analog transitions. The total 1{sup +} strength in these reactions was extracted by normalizing the intensity in the 1{sup +} peaks to the Fermi transition strength observed in the isobaric analog state. The Gamow-Teller strength observed in 1{sup +} peaks above a fitted polynomial background is typically 55% of the sum rule obtained by assuming that the strength of {beta}{sup +} transitions is negligible. The portion of this strength found at excitation energies less than that of the Gamow-Teller giant resonance varied from 15% for {sup 128}Te to 38% for {sup 76}Ge. Experimental results are compared with predictions of a shell model that includes a pairing force and a long-range Gamow-Teller force in both parent and daughter nuclei. A comparison of the strength functions of the tellurium isotopes is made; this comparison is relevant in determining whether double-beta decay without neutrino emission (0{nu} decay) is observed in these isotopes.

• OSTI ID: 5539668
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ARSENIC 76
ARSENIC ISOTOPES
BARYON REACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BROMINE 82
BROMINE ISOTOPES
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
CYCLIC ACCELERATORS
CYCLOTRONS
DAYS LIVING RADIOISOTOPES
DECAY
DIFFERENTIAL CROSS SECTIONS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY RANGE
FUNCTIONS
GAMOW-TELLER RULES
GERMANIUM 76 TARGET
HADRON REACTIONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE 128
IODINE 130
IODINE ISOTOPES
ISOBARIC ANALOGS
ISOCHRONOUS CYCLOTRONS
ISOTOPES
IU CYCLOTRON
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NEUTRON SPECTRA
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
PROTON REACTIONS
RADIOISOTOPES
SELENIUM 82 TARGET
SHELL MODELS
SPECTRA
STRENGTH FUNCTIONS
TARGETS
TELLURIUM 128 TARGET
TELLURIUM 130 TARGET