Nuclear Data Sheets for A = 170

Enhanced mixing of intrinsic states in deformed Hf nuclei

“…This level was previously reported [16] to decay to the 4 + 1 , 2 + 1 , and 0 + 1 levels through transitions of 666, 887, and 988 keV, respectively. In the present work, a 988.04(6)-keV transition to the 0 + 1 level and a 666.35(8)-keV transition to the 4 + 1 level are observed with intensities similar to those given in the literature.…”

“…This gives good support for axial symmetry in these nuclei and K, the projection of angular momentum onto the symmetry axis, can be considered an approximately good quantum number. Furthermore, the energies of the 2 + γ and 2 + β levels in 166 Hf through 174 Hf [14][15][16][17][18] follow interesting trajectories, as shown in Fig. 1.…”

“…The level scheme obtained in the present work provided substantial modification to the current literature β + / decay data [16] on 170 Hf. The evaluated β-decay data are based on a single previous β-decay measurement [22].…”

“…The parent 170 Ta nuclei were produced through the 159 Tb( 16 O, 5n) reaction by bombarding a 4.4-mg/cm 2 target with a ∼14 pnA, 100-MeV 16 O beam provided by the Yale ESTU tandem accelerator. The reaction products are emitted in a forward solid angle cone, deposited on a 16-mm-wide aluminized Kapton tape and transported periodically to the center of a superconducting coil.…”

“…The tape was moved cyclically every 15 min to optimize the observed decay from the parent 170 Ta (T 1/2 = 6.8 min) nuclei. 170 Ta decays to 170 Hf with a Q value of 6.1 MeV [16].…”