Nuclear Data Sheets for A = 171☆

We have made experimental measurements in {sup 170}Tm of the following: secondary {gamma} rays, conversion electrons, and {gamma}-{gamma} coincidences from thermal neutron capture in {sup 169}Tm, primary {gamma} rays from average resonance capture with 2-keV and 24-keV neutron beams, and proton spectra from the ({ital d},{ital p}) reaction on {sup 169}Tm. From these data and those of previous investigations, we have identified more than 130 excited levels in {sup 170}Tm below 1550 keV. Of these, 62 (with connecting transitions) are placed in 18 rotational bands with assigned Nilsson configurations. These results are in good agreement with a semiempirical modeling of {sup 170}Tm level structure. Values for seven Gallagher-Moszkowski splittings and four Newby shifts have been obtained. These matrix elements show remarkably good agreement with calculation. Among the observed {ital K}{sup {pi}}=1{sup {minus}} and 2{sup {minus}} rotational bands, configuration mixing appears to play a significant role. {copyright} {ital 1996 The American Physical Society.}

Nuclear structure of {sup 170}Tm from neutron-capture and ({ital d},{ital p})-reaction measurements

Nuclear Data Sheets for A=170

The double neutron capture reaction 169Tm(n,γ)170Tm(n,γ)171Tm and the proton transfer reaction 170Er(3He,d)171Tm were used to study nuclear levels in 171Tm. The level scheme up to 1 MeV was confirmed and very precise level energies were determined. The results are compared with the quasiparticle-phonon model. Evidence was found, that the 1/2−[541] orbit has larger deformation than the other states.

THE LEVEL SCHEME OF 171Tm STUDIED BY MULTIPLE NEUTRON CAPTURE AND THE (3He,d) REACTION

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THE LEVEL SCHEME OF 171Tm STUDIED BY MULTIPLE NEUTRON CAPTURE AND THE (3He,d) REACTION