Artificial Radioactivity ofTi45

Discovery of scandium, titanium, mercury, and einsteinium isotopes

“…Therefore the 4.4 h activity certainly corresponds to Sc 43 .'' This half-life, quoted with a possible error of 10% agrees with the currently adopted value of 3.891 (12) h. 44 …”

“…This half-life agrees with the currently accepted values of 3.97(4) h. In the main text of the paper 44 Sc had been assigned a half-life of 53 ± 3 min. A 3-h half-life had been reported earlier but it was assigned only to either 42 Sc or 44 Sc [17]. 45 …”

“…The half-life of 57(2) min agrees with the currently accepted value of 57.2(2) min. The mentioned 53(3) min half-life was originally assigned to 44 Sc but changed to 41 Sc in a note added in proof [12] which was still incorrect. 50 Sc could not be confirmed [26,27].…”

“…44 Sc was identified in the reaction 41 K(a, n) by bombarding potassium fluoride with 11 MeV a particles from the Berkeley cyclotron as described in a note added in proof: ''By deflecting the emitted particles in a magnetic field it has been established that they are positrons. The decay curve shows the presence of two isotopes with half-lives of 4.1 ± 0.2 h and 52 ± 2 h. As the long period agrees with that observed in the scandium precipitate from calcium + deuterons it must be associated with Sc 44 .…”

“…Previously, a half-life of 52(2) h. had been reported which was changed to 53(3) min in a note added in proof [12]. The assignment was based on the assumption that 44 Ca was the heaviest stable isotope. 42 …”