Nonobservation of {sup 12}C cluster decay of {sup 114}Ba

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.R2912· OSTI ID:550633

Guglielmetti, A; Bonetti, R; Poli, G ^[1]; Collatz, R; Hu, Z; Kirchner, R; Roeckl, E ^[2]; Gunn, N; Price, P B; Weaver, B A; Westphal, A ^[3]; Szerypo, J ^[4]

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1. Istituto di Fisica Generale Applicata dellUniversita di Milano
2. Gesellschaft fuer Schwerionenforschung, D-64220 Darmstadt (Germany)
3. Physics Department and Lawrence Berkeley Laboratory, University of California at Berkeley, Berkeley, California 94720 (United States)
4. Institute of Experimental Physics, Warsaw University, PL-00681 Warsaw (Poland)

By means of the on-line mass separator at Gesellschaft f{umlt u}r Schwerionenforschung, Darmstadt, we produced {sup 114}Ba through the {sup 51}Ni({sup 58}Ni,2n) reaction, separated it as a {sup 114}Ba{sup 19}F{sup +} beam, and implanted it into a stopper foil positioned in the center of an array of track detectors, which were used to search for {sup 12}C radioactivity of {sup 114}Ba. A total number of (5.4{plus_minus}1.7){times}10{sup 4} {sup 114}Ba atoms were implanted. No {sup 12}C event was found after a total exposure time of 116 h, corresponding to a {sup 58}Ni beam dose of 1.3{times}10{sup 17}. The resulting upper limit of 3.4{times}10{sup {minus}5} (84{percent} C.L.) for the branching ratio for {sup 12}C decay of {sup 114}Ba is considerably lower than the limits obtained in previous experiments, which represents an inconsistency at levels of more than 90{percent}. A semiempirical estimate of 19.3 MeV for the upper limit of the Q value for {sup 12}C decay of {sup 114}Ba is derived. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 550633
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 56; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM 114
BRANCHING RATIO
CARBON 12 EMISSION DECAY
CLUSTER MODEL
NICKEL 58 REACTIONS
NICKEL ISOTOPES
NUCLEAR DECAY
Q-VALUE
RADIOACTIVITY