K-capture to positon branching ratios in the decay of Ga68

Ramaswamy, M. K. (1959) K-capture to positon branching ratios in the decay of Ga68 Nuclear Physics, 10 . pp. 205-212. ISSN 0029-5582

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002955...

Related URL: http://dx.doi.org/10.1016/0029-5582(59)90207-X


K-capture to positon branching ratios have been measured in the decay of Ga68 using coincidence scintillation spectrometer techniques. The measured values are 1.28±0.12 (to the first excited state) and 0.10±0.02 (to the ground state). Assuming these decays to be pure Gamow-Teller transitions the Fierz interference terms are computed to be bGT=-0.03±0.02 and +0.03±0.01 respectively (the uncertainty in the latter result arising from uncertainty in N0, the source strength). The ratio of positons to the first excited state and ground state of Zn68 has been found to be (1.76±0.22)×10-2. A search for a possible low-lying 0+ state in Ga68 was made through the decay of Ge68 using X-ray-X-ray and X-ray-γ-ray coincidences employing NaI(Tl) crystals. Besides the 9 keV K X-ray, annihilation radiation and the known γ-ray in Ga68 whose energy was measured to be 1.067±0.035 MeV, no other γ-ray was observed (> 8% of 1.07 γ). The number of positons per 1.07 γ quantum was determined as 19.47±2.10 by comparison with Na22. An upper limit of 0.4% per decay was set on positon emission by Ge68.

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