[en] A preliminary ¹⁵³Dy level scheme, fed from the decays of ¹⁵³Ho and ¹⁵³sup(m)Ho, is presented. At both Ho isomers correspond two distinct level schemes, with respectively low and high spins. The low spin part seems very similar to the low spin scheme of the ¹⁵¹Gd isotone, the interpretation of which suppose a small deformation. The high spin part, dominated by the strong β⁺ transition (h11/2)p → (h9/2)n, can be correlated to the scheme obtained by in-beam excitations. (orig.)

[en] In the present work the existing level scheme have been extended from the experimental data and studied specifically the positive parity states in ¹⁵³Ho theoretically to understand the issue of shape coexistence in this nucleus

[en] In a recent experiment carried out with the EUROGAM PHASE II γ-ray spectrometer three new superdeformed (SD) bands have been established in ¹⁵³Ho. The properties of these SD bands are discussed in terms of proton particle-hole excitations and are compared to the SD bands in the adjacent nuclei. This is the first observation of SD structures in a Z = 67 nucleus. (author)

[en] A few examples of the nuclear behaviour at high angular momenta by studying γ-rays emitted in (HI,Xn) reactions are presented. As an example the study of very-high spin states in ¹⁵³Ho via discrete-line γ-ray spectroscopy, and a comparison between the partial decay schemes of ¹⁵³Ho and the neighbouring ¹⁵²Dy and ¹⁵⁴Er nuclei are discussed in the context of the high spin structure. Also comments on some phenomena observed at high spin states in ¹⁵³Ho and ¹⁵²Dy nuclei are presented. (author)

No abstract available

[en] In ¹⁵³Ho, high-spin yrast (isomeric) states are established to be single particle character and the continuum state exhibit the onset of collective motion. The structure of the high-spin yrast states can be be confirmed by measurements of g factors since it depend on the coupling scheme for the individual particles particularly the relative contributions of protons and neutrons to the total angular momentum

[en] Full text: The Indian National Gamma Array comprising of about 8 clovers, in its third phase was stationed at VECC. Several experiments were successfully completed using this facility. The unique energy range and the availability of inert ²⁰Ne projectile were exploited to populate nuclei difficult to access using conventional fusion reactions. During this presentation, the results obtained by the various University groups on the level structure of spherical (⁵⁴Mn, ⁵⁰, ⁵¹Cr, ¹⁵³Ho) and deformed (¹⁷⁸Os) nuclei would be presented. (author)

[en] The cranked relativistic mean field (CRMF) theory is applied for the description of superdeformed (SD) rotational bands observed in ¹⁵³Ho. The question of the structure of the so-called SD band in ¹⁵⁴Er is also addressed and a brief overview of applications of CRMF theory to the description of rotating nuclei at extreme conditions is presented

[en] In a recent experiment performed with the EUROGAM II γ-ray spectrometer three superdeformed (SD) bands have been established in ¹⁵³Ho. The properties of these bands are discussed in terms of single-particle proton excitations and are compared with respect to the SD magic nucleus ¹⁵²Dy. These results represent the first observation of SD structures in a holmium nucleus and provide further information on the proton orbitals lying above the Z=66 shell gap. copyright 1997 The American Physical Society

[en] The few valence particle nuclei around doubly magic ¹⁴⁶Gd nucleus have been found to be very soft against shape changes. Their structural features evolve from pure single particle excitations to strongly deformed collective modes with increase in spin as well as in the number of valence particles. In the present work ¹⁵³Ho has been theoretical studied, especially the lifetimes of the three isomers in the positive parity states to verify the claim of prolate deformation for these states