TA-181(P,2NGAMMA)W-180 REACTION

States populated by the Ta181(p,2n) W180 reaction were studied using in-beam -ray spectroscopy with standard techniques that included fast timing, coincidences, and angular distributions. We populate the previously well characterized bands built on the ground state and the 5.2-ms 8- state at 1529.0 keV up to the 12+ and 12- levels, respectively. In addition we identify the rotational band built on the 7.4-ns K=2- octupole vibrational state at 1006.4 keV up to the J=11- member and we observe the decoupling of the octupole phonon from the core rotation. A state at 1634.6 keV is populated with moderate intensity. If this state is the one reported at 1637 keV in (d,d) excitation then it is most likely the K=3- octupole vibration. We observe the gamma-vibrational band up to the spin 7 member and also a new band built on a metastable state at 1639.8 keV. This state has a half life of 19.20.3 ns and most likely J=5 with uncertain parity. NUCLEAR REACTIONS Ta181(p,2n), E=16 MeV; measured E, I, - coinc, T12(), W(), deduced levels E, J, K, . © 1979 The American Physical Society.