J. Berzins

162Dy studied with (n, γ), (n, n′γ), (d, p) and (d, t) reactions

Abstract The γ-ray spectra of 162 Dy were measured by (n, γ), (n, γγ) and (n, n′γ) reactions. In the 161 Dy(d, p) and 163 Dy(d, t) reactions the levels up to 2600 keV and 3200 keV, respectively, were identified. The level scheme was extended by additional rotational states up to 2190 keV. The vibrational and two-quasiparticle states were described within the quasiparticle-phonon nuclear model.

Nuclear levels in 187W

Abstract Levels in 187W have been studied up to 2.2 MeV with the (d, p) and (n, γ) reactions. The (d, p) studies were performed at deuteron energies of 24 and 28 MeV and at two angles of 30° and 50° by using the high resolution Q3D spectrograph in Munich. Primary and secondary γ-rays and γ-γ coincidences were studied with Ge detectors. The combination of these results with the previously known ones allows us to extend the existing level scheme and refine some of its structure assignments. Most of the low-lying states have been classified in terms of the Nilsson model with the extension of some vibrational degrees of freedom. The possibility for the coexistence of triaxial or oblate shapes in 187W is observed in the form of anti-aligned states with a bandhead of 9 2 − at 364 keV. The polarization effects towards the triaxial shape produced by the odd neutron in specific Nilsson orbitals have been studied. The calculated polarization energies for some γ-driving orbitals are comparable with the prolate-oblate energy difference which indicates the possibility of the stabilization of triaxial or oblate shapes in these states.

Transfer and neutron capture reactions to 194Ir as a test of Uν(6/12)⊗Uπ(6/4) supersymmetry

The structure of 194 Ir is investigated via (n, y), (n, e - ), (d, p), and (d, a) spectroscopy. The use of different methods leads to an almost complete level scheme up to high excitation energies including γ-decay and spin-parity assignments. A reanalysis of the formerly published (n, y) data was triggered by our new (d, p) and (d, a) transfer reactions. The experimental level scheme is compared to predictions using extended supersymmetry. Herein, the classification of states was done according to quantum numbers, excitation energies, and (d, a) transfer strengths. A one-to-one correspondence in excitation energies was obtained for the 23 lowest lying theoretical states with similar structures for the experimental and calculated level schemes. The two-nucleon transfer strengths show remarkable agreement. A Nilsson classification is discussed as well.