No abstract available

[en] The study of correlations between particle evaporation from highly excited compound nuclei at large angular momenta and the states in the final evaporation residues (ER) is a field of investigation which has been opened, in the last years, with the advent of the new large γ-ray arrays. It is now possible to correlate the evaporation spectra to various bands with shapes ranging from spherical to superdeformed (SD) in the same final nucleus. It is generally accepted that the particle evaporation from the compound nucleus is chaotic and that only in the near-yrast γ cascade, where the feeding of different classes of states takes place, the ordered motion is restored. The sensitivity of the particle spectra on the feeding of specific states in the residual nuclei can be taken as an indication that additional degrees of freedom might be important in the evaporation process or that particular regions of the phase space open to the decay populate preferentially some selected structures in the final cold nucleus. This latter point is important for the understanding of the feeding mechanism of SD states. Several experiments performed so far did not find a clear dependence of the shapes of the particle spectra on the excited states having different deformations in the ER. For example, the proton spectra in coincidence with transitions in the SD bands of ¹³³Nd and ¹⁵²Dy nuclei were found to be similar to those in coincidence with transitions in the normal deformed (ND) bands. Alpha particles have been proposed since long as a sensitive probe of the deformation of the emitting nucleus. Results are presented here of an experiment in which the authors have measured the energy spectra of alpha particles associated with different classes of states (ND and SD) in the ¹⁵⁰Tb nucleus populated in the reaction ³⁷Cl(¹²⁰Sn, α3nγ)¹⁵⁰Tb

[en] The short lived α-emitting radionuclides have enormous potential in the targeted radio immuno therapy, especially when localization of dose in the affected cells becomes important. ¹⁴⁹Tb, owing to its moderate half-life (T_1/2=4.118 h) and high α-particle energy (3.97 MeV), is among the few promising α-emitting radionuclides which are presently projected for human clinical use. Moreover, the tri-valent metallic radionuclide, ¹⁴⁹Tb offers stable labelling in conjugation with chelating ligands, macromolecules or peptides. However, till date, only few attempts have been made for production and separation of no-carrier-added (nca) ¹⁴⁹Tb. An effort was made to produce nca ¹⁴⁹Tb by bombarding 71.5 MeV ¹²C projectile on natural praseodymium metal foil of 14.5 mg/cm² thickness at the BARC-TIFR Pelletron accelerator facility, Mumbai, India. The γ-spectrometric measurements showed the production of ¹⁵⁰,¹⁴⁹Tb in the target matrix and the batch yield of 77.5 and 54 kBq/μA.h were achieved for ¹⁴⁹Tb and ¹⁵⁰Tb respectively

No abstract available

[en] Several γ-ray spectra of ¹⁵⁰Tb were obtained with Ge(Li) detectors including some energy calibration spectra. About 450 γ rays were observed from 153 to 4562 keV with an intensity range of almost 10⁵. Gamma energies and intensities are tabulated

[en] Energies and intensities of gamma rays are tabulated for the decay of ¹⁵⁰Tb (3.1 hr.)

[en] The yrast states of the odd-odd nucleus ¹⁵⁰Tb were investigated through the ¹⁵¹Eu (α,5n) and ¹³⁶Ce(¹⁸O,p3n) reactions. The resulting level scheme is shown. Spin assignments are based on conversion-electron data and γ-ray angular distribution results. 1 figures

[en] Decay studies of 3.6 hour ¹⁵⁰Tb are analyzed and a partial decay scheme based on incomplete data is presented. Spins and parities of the levels are not yet well established. (1 figure, 1 table) (U.S.)

[en] There are now over 40 superdeformed (SD) bands known in the A ∼ 150 region and in most cases the properties of these bands are understood in terms of single-particle excitations in the absence of pairing. By continuing the search for new SD bands we hope to gain insight into (1) the ordering of the proton and neutron orbitals near the Fermi surface in the SD well, (2) the effects that the alignment of those orbitals has on the moments of inertia, and (3) the collective excitations in the SD well. For ¹⁵⁰Tb, which is one proton and one neutron away from the SD doubly-magic nucleus ¹⁵²Dy, it should be possible to study SD bands based on both proton and neutron hole excitations. By adding one proton to the ¹⁵²Dy nucleus (i.e. ¹⁵³Ho) proton excitations above the Z = 66 shell gap can be studied. These excitations are important as calculations suggested that the proton intruder orbital N = 7 might become occupied. Interactions between this orbital and a N = 5 level may result in softness towards octupole vibrations. High spin states in ¹⁵⁰Th and ¹⁵³Ho were populated using the ¹²⁴Sn(³¹P,5n) and ¹²⁰Sn(³⁷Cl,4n) reactions, respectively. In both cases the early implementation phase of Gammasphere was used to detect the decay gamma rays and over 1 x 10⁹ triple and higher fold coincidence events were recorded. In ¹⁵⁰Tb, the data analysis is complete and two new SD bands were identified. The fact that Im⁽²⁾ moments of inertia are sensitive to the specific high-N intruder content of the SD bands was used to suggest configurations for the two new bands. A paper reporting these results is being prepared. For ¹⁵³Ho, data analysis is still in its early stages

No abstract available