No abstract

No abstract

No abstract

Excited states in the 84 Sr nucleus were investigated via the
Ge( 12 C,4n) 84 Sr reaction at a beam energy of 58 MeV. The de-excited γ-rays were
detected using the Indian National Gamma Array (INGA) spectrometer at Inter-
University Accelerator Center, New Delhi. Directional Correlation from Oriented
(DCO) states ratio and the polarization asymmetry (∆) measurements were done to
confirm the spin-parity of the low-lying states. Eight new γ-ray transitions were placed
in the level scheme of 84 Sr. The systematic behaviour of energy staggering S(I) of the
γ-band (Band 1 and Band 2) was compared with the γ-bands in the mass A≈80 region
and the nuclei of other mass region with similar behaviour (odd-I down). The E1
character is confirmed for strong γ-ray transitions connecting Band 3 to Yrast band.
Comparison of new results such as B(E1)/B(E2) ratio, frequency ratio ω − /ω + and
energy displacement ∆E in 84 Sr with those of 72 Se, 150 Sm, 152 Gd, 220 Ra and 224 Th
nuclei suggests the presence of octupole correlations in 84 Sr.

Thin foils of Au, Pb and Bi of different thicknesses were prepared via physical vapor deposition to be used as targets in ion-atom collision experiments. The quality of the fabricated foils was assessed by different characterization techniques. The α-energy loss method was used to measure the thicknesses of the foils, Rutherford backscattering was used to measure both thickness and purity of the foils, and scanning electron microscopy was used to study the surface morphology of the foils. Herein, details on the fabrication techniques along with the thickness measurements and characterization results are reported. These investigations formed a crucial part of a study wherein the effect of target thickness on heavy-ion-induced X-ray production cross sections was explored.