?-Strahlung durch langsame Neutronen

Fleischmann, R.

doi:10.1007/bf01497362

Cited by 11 publications

(3 citation statements)

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“…In such cases, the next heavier isotope of cadmium, mercury, gadolinium, etc. is stable and is formed by the radiative capture of the neutron.6 Gamma-rays emitted in such neutron capture, in the production of both stable and unstable nuclei, have been observed by Fermi (4) and others (45,61). Their energy has been roughly measured in several cases by Rasetti (86).…”

Section: Reactions Produced By Neutron Bombardmentmentioning

confidence: 99%

“…The identity in intensity of the two short periods suggests that they are products of successive decay, but none of the radioelements concerned has been identified. 45. Rhodium VIII Rhodium can be strongly activated (4) by bombardment with slow neutrons.…”

Section: Masuriummentioning

confidence: 99%

“…A weak activity in tellurium irradiated with neutrons has a period of 45 minutes and is water-sensitive. It is probably due to an isotope of Te (4).…”

Section: Tellurium VIIImentioning

confidence: 99%

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Aritificial Radioactivity.

Ridenour¹,

Yost²

1936

Chem. Rev.

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On January 15, 1934, I. Curie and F. Joliot (26) observed for the first time the phenomenon which, under the name of "induced" or "artificial" radioactivity, had been sought since the discovery of the natural activity of uranium by Becquerel in 1896. In the course of their investigations of the positive electron, which had been discovered less than two years before, they found that when certain light elements (boron, magnesium, aluminum) were bombarded with the alpha-particles of polonium, they emitted positrons in large numbers. The discovery of artificial radioactivity was made when Curie and Joliot found that the emission of positrons from the bombarded elements did not cease immediately upon the removal of the source of alpha-particles, but instead decayed according to an exponential law, with a half-life of several minutes duration, characteristic of the substance bombarded.2 They found that the growth of the activity under alpha-particle bombardment followed the usual exponential curve, the transformation constant being the same for growth and decay; after a time of irradiation, long as compared with the half-life of the substance under investigation, the activity produced in a sample reached a saturation value which could not be increased by further irradiation. The intensity of the artificial radioactivity was decreased by a reduction in the energy of the bombarding alpha-particles, but the half-life was independent of the energy with which the alpha-particles struck the target being activated. The new type of radioactivity is seen to be precisely the same in character as natural radioactive beta-disintegration, save for the two important differences that (a) the particles emitted are positive, not negative, electrons, and (b) the radioactive nuclei are derived, not from the preceding decay of a naturally radioactive parent, but from a nuclear transmutation

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Section: Reactions Produced By Neutron Bombardmentmentioning

confidence: 99%

Section: Masuriummentioning

confidence: 99%