The limit of stability of proton-rich thallium isotopes: a search for the decay of177Tl
Sellin, P. J. ; Woods, P. J. ; Page, R. D. ; Bennett, S. J. ; Cunningham, R. A. ; Freer, M. ; Fulton, B. R. ; Hotchkis, M. A. C. ; James, A. N.
Springer
Published 1991
Springer
Published 1991
| ISSN: |
1434-601X
|
|---|---|
| Keywords: |
23.90.+ w ; 23.90.+ e ; 27.70.+ q
|
| Source: |
Springer Online Journal Archives 1860-2000
|
| Topics: |
Physics
|
| Notes: |
Abstract The fusion reaction74Se+106Cd→180Pb* at a compound nucleus excitation energy Ex ≃ 40 MeV, has been used in a search for the decay of the unknown nucleus177Tl. Evaporation residues were velocity and mass analysed prior to implantation into a position sensitive silicon surface barrier detector. No evidence was discovered for the proton or alpha-decay of177Tl for a cross-section 〉 10 − 5+10 nb. This indicates either that177Tl decays too rapidly (t1/2 〈 1 μs) by proton emission for the decay to be detected, or that177Tl is produced with a cross-section less than the limit established in the present experiment. The following nuclear decay half-lives were measured with improved accuracy;177Hg (t1/2 = 130±5 ms),178Hg (t1/2=250±25 ms) and177Au (t1/2=1180±70 ms). The experiment also provided the first direct confirmation of the correct mass assignment of the alpha-decay, Eα=6.26 MeV, to the decay of176Au. Two additional halflife measurements of proton-rich Osmium isotopes are also presented from a previous similar experiment;165Os (t1/2=73±8 ms) and166Os (t1/2 = 194±17 ms).
|
| Type of Medium: |
Electronic Resource
|
| URL: |