Alpha Decay Properties of some Holmium Isotopes near the 82-Neutron Closed Shell

Alpha-Decay Properties of Some Erbium Isotopes near the 82-Neutron Closed Shell

“…In each case, the variation of yield with incident bombarding energy was found to correspond very closely with results previously obtained for heavyion-induced compound-nucleus reactions where only neutrons are evaporated. 8 ' 15 From these measurements it was concluded that the three new alpha groups are due to isotopes of erbium. Additional results were obtained which confirmed that these are erbium alpha emitters and information on mass assignments was also obtained.…”

“…None of these alpha groups was observed in Pr 141 +0 16 bombardments which produce isotopes of the rare earth elements up to holmium. 8 Excitation functions were obtained for these activities. In each case, the variation of yield with incident bombarding energy was found to correspond very closely with results previously obtained for heavyion-induced compound-nucleus reactions where only neutrons are evaporated.…”

“…Specific details of the target assembly and arrangement of the collecting electrodes are described in earlier papers. 6,8 Because of the short half-life of Er 152 , a faster method for collecting and analyzing the activity was also used. This method has been useful for studying alpha activities whose half-lives are greater than 0.03 sec.…”

“…Energy calibration was obtained from the alpha particles of Po 210 (5.30 MeV), 13 Ho 151 (4.51 MeV), 8 …”

“…The alpha decay properties of the 84-neutron isotopes of the elements from Z=60 to Z-67 have been reported and for some elements alpha activities from isotopes with N -85 to N = 88 have been observed. [1][2][3][4][5][6][7][8] The purpose of this paper is to report on results which were obtained for the 84-, 85-, and 86-neutron isotopes of erbium (Z= 68). A preliminary report of these results has been given earlier.…”