Browsing by Author "C.K. Gupta"

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Indications of octupole correlation in 84Sr
(Institute of Physics, 2023) Anuj; S. Kumar; Naveen Kumar; Neelam Rajput; K. Rojeeta Devi; Neeraj Kumar; C.V. Ahmad; Akashrup Banerjee; Aman Rohilla; C.K. Gupta; Anand Pandey; Ravi Bhushan; Unnati Gupta; S.K. Mandal; S.S. Bhattacharjee; Divya Arora; R. Garg; Indu Bala; Rakesh Kumar; R.P. Singh; S. Muralithar; V.V. Jyothi; Chandrani Majumder; Hariprakash Sharma; Anupriya Sharma; S.K. Dhiman
Excited states in the 84Sr nucleus were investigated via the 76Ge(12C,4n)84Sr 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 (Δ) 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 84Sr. 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 regions with similar behaviour (odd-I down). The E1 character is confirmed for strong γ-ray transitions connecting Band 3 to the Yrast band. Comparison of new results such as B(E1)/B(E2) ratio, frequency ratio ω −/ω + and energy displacement ΔE in 84Sr with those of 72Se, 150Sm, 152Gd, 220Ra and 224Th nuclei suggests the presence of octupole correlations in 84Sr. © 2023 IOP Publishing Ltd
Investigating prolate-oblate shape inversion in pt nuclei near a ∼ 188
(Jagellonian University, 2017) S.K. Chamoli; Aman Rohilla; C.K. Gupta; R.P. Singh; S. Muralithar; S. Chakraborty; H.P. Sharma; A. Kumar; I.M. Govil; D.C. Biswas
Lifetimes have been measured of the low- and intermediate-spins states in 188Pt nucleus using the recoil distance Doppler shift technique at IUAC, Delhi. The nuclear states of interest were populated via 174Yb(18O,4n)188Pt reaction at a beam energy of 79 MeV provided by 15 UD Pelletron accelerator. The extracted B(E2) values show an increase up to 4+ state and then a near constant behavior with spin along yrast band, indicating change of the nuclear shape in 188Pt at low spins. The average absolute β2 = 0:20(3) obtained from measured B(E2) values matches well the values predicted by CHFB and IBM calculations for oblate (β2 ∼ -0:19) and prolate (β2 ∼ 0:22) shapes.
Lifetime measurements in shape transition nucleus 188Pt
(Springer New York LLC, 2017) Aman Rohilla; C.K. Gupta; R.P. Singh; S. Muralithar; S. Chakraborty; H.P. Sharma; A. Kumar; I.M. Govil; D.C. Biswas; S.K. Chamoli
Nuclear level lifetimes of high spin states in yrast and non-yrast bands of 188Pt nucleus have been measured using recoil distance plunger setup present at IUAC, Delhi. In the experiment nuclear states of interest were populated via 174Yb(18O,4n)188Pt reaction at a beam energy of 79MeV provided by 15 UD Pelletron accelerator. The extracted B(E2 ↓) values show an initial rise up to 4 + state and then a nearly constant behavior with spin along yrast band, indicating change of nuclear structure in 188Pt at low spins. The good agreement between experimental and TPSM model B(E2 ↓) values up to 4 + state suggests an increase in axial deformation of the nucleus. The average absolute β2= 0. 20 (3) obtained from measured B(E2 ↓) values matches well the values predicted by CHFB and IBM calculations for oblate (β2∼ - 0. 19) and prolate (β2∼ 0. 22) shapes. As the lifetime measurements do not yield the sign of β2, no definite conclusion can be drawn on the prolate or oblate collectivity of 188Pt on the basis of present measurements. © 2017, SIF, Springer-Verlag Berlin Heidelberg.