COINCIDENCE NUCLEAR SPECTROMETRY WITH APPLICATIONS TO EUROPIUM-154 AND EUROPIUM-155 (thesis)

Juliano, Jose O.

doi:10.2172/4345613

Cited by 2 publications

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“…Tantalum-175 can also be made •by alpha-particle bombardment on the 60-inch cyclotron. The reaction used was Lul75(o:,4n)Tal75, This reaction should have a high cross section at the full 48-Mev energy available at the cyclotron, ahd the intense beam produces a large amount of activity, making poss:ible detailed spectrographic studies of theisotop~'• The reaction also produces large amounts of Ta 1 76 , but since its conversion-electron lines are well known3° they may be subtracted out.…”

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Nuclear decay scheme studies of some tantalum and terbium isotopes

Faler¹

1959

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A previously unreported isotope of' terbium~ Tb , was produced. Its gamma-ray spectrum was studied and its h~lf life was deter= mined to be 18.5±0.5 hr. The similarity to the half lives of two 151 154 neighboring isotopes, 19-hr Tb and. 17-hr Tb :; e~plains why it was previously overlooked. 161 The decay scheme of Tb was studied and precise transition energies are reported. The lifetimes of two excited states were measured and used to resolve a ~uestion of transition se~uence encountered by previous investigators. Three new isotopes of tantalum were discovered" They are 3.7-hr Ta 1 73, 1.2~hr Ta 1 7 4 , and 11-hr Ta 175 • Tantalum-175 was studied. in detail and a decay scheme is presented using eight of the transitions observed in conversion-ele::ctron studies. Four excited states are proposed, and Nilsson quantum numbers are assigned;, Electron-sensitive nuclear track emulsions were used in conjunction with electron spectrographs, and the usefulness of the method of track counting is discussed..

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confidence: 99%