Abstract
THE elements copper, molybdenum, silver, cadmium, indium and lead have been irradiated by a pulsed beam of X-rays, activity ascribable to metastable states being sought in the intervals between pulses. The electrons producing the X-ray pulses had energies up to 1.05 MeV., the pulse width was 5 µsec., repetition frequency 200 per sec. and mean current 15 µamp.; the mean current during the pulse was thus approximately 15 m.amp. The elements were irradiated within Geiger–Müller counters, counts between pulses being displayed on an oscillograph with time-base triggered by the pulses. No evidence of activity was obtained. Periods greater than 100µsec. could have been detected. Some details are given below of the experimental arrangements whereby a particular spurious effect can be eliminated, since these may be of interest in similar studies where more energetic X-rays are available.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Bowen, E. G., Pulley, O. O., and Gooden, J. S., Nature, 157, 840 (1946).
Libby, W. F., and Lee, D. D., Phys. Rev., 55, 245 (1939).
Waldman, B., and Collins, G. B., Phys. Rev., 57, 338 (L) (1940).
Wiedenbeck, M. L., Phys. Rev., 67, 92 (1945).
Waldman, B., Collins, G. B., Stubblefield, E. M., and Goldhaber, M., Phys. Rev., 55, 1129 (A) (1939).
See, for example, de Benedetti, S., and McGowan, F. K., Phys. Rev., 70, 569 (1946); 71, 380 (1947).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
TREACY, P. Nuclear Isomeric Transitions of Short Periods. Nature 162, 186–187 (1948). https://doi.org/10.1038/162186a0
Issue Date:
DOI: https://doi.org/10.1038/162186a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.