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Indication of γ -vibration in 123,125,127I
(Institute of Physics Publishing, 2020) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; P. Banerjee; S. Ganguly; S. Kumar; A. Kumar; A. Kumar; R.P. Singh; S. Muralithar
High spin states in 127I were populated via 124Sn(7Li, 4nγ) fusion-evaporation reaction at E beam = 33 MeV. Level scheme of 127I has been updated by placing new γ-rays and also by confirming the spin/parity of several energy levels. Two new levels at E x = 2628 and 3199 keV have been identified which are found to decay into the negative parity πh 11/2 band. These two states and two earlier reported states at 3502 and 3989 keV have been interpreted as the γ-vibrational states on the basis of their decay pattern. Two positive parity three-quasiparticle bands above I π = 23/2+ states at 2901 and 3060 keV have been identified to be a possible candidate of chiral band. A comparison in the isotopic and isotonic chains reveals the possible existence of γ-vibration and chiral rotation in 123-127I. © 2020 IOP Publishing Ltd.
Three-quasineutron 3-band in 127Xe
(Institute of Physics, 2023) S. Chakraborty; H.P. Sharma; S. Jehangir; S.S. Tiwary; C. Majumder; A.K. Gupta; G.H. Bhat; J.A. Sheikh; N. Rather; P. Banerjee; S. Ganguly; S. Rai; Pragati; S. Muralithar; R.P. Singh; S.S. Bhattacharjee; S. Kumar; Mayank; A. Kumar; R. Palit
Structures of negative parity multi-quasiparticle states in 127Xe have been investigated through in-beam 3-ray spectroscopy. Excited states were populated via the 122Sn(9Be, 4n 3)127Xe fusion-evaporation reaction at E beam = 48 MeV. Two new negative parity bands have been identified and their structures have been discussed using the triaxial projected shell model (TPSM) approach. One of the bands is established above the I π = 27/2- state at 3702 keV and based on the experimental inferences and TPSM results, this band is interpreted as a 3-band built on a three-quasineutron configuration. The second sequence, found above I π = 31/2- state at 4848 keV, is proposed to have a two-proton aligned configuration ( νh11/2⨂πh11/22 ), considering the properties of this band with the neighbouring isotopes. The analysis of the TPSM wave function substantiates the proposed interpretation of this band. © 2023 IOP Publishing Ltd.
Lifetime measurements in 104Pd
(IOP Publishing Ltd, 2020) C. Majumder; H.P. Sharma; S. Chakraborty; S.S. Tiwary; R.P. Singh; S. Muralithar; Indu Bala; S.S. Bhattacharjee; R. Garg; Neelam; A. Sharma; P.V. Madhusudhana Rao
High spin states in 104Pd were populated via 94Zr(13C, 3nγ) fusion-evaporation reaction at a beam energy of 55 MeV. The Indian National Gamma Array was utilized to detect the de-exciting γ-rays. Lifetimes of states in the negative parity bands have been determined using theDoppler shift attenuationmethod. The present lifetime results suggest a moderate quadrupole deformation (β2 ≈ 0.2) for the negative parity bands. The Woods-Saxon total Routhian surface calculations have also been carried out which predicted a similar deformation for these bands. In addition, lifetimes of states in the positive parity band have also been determined. Present results found in agreement with the earlier reported values of lifetimes and hence agreed with the antimagnetic rotational character of the band as interpreted earlier. © 2020 IOP Publishing Ltd Printed in the UK.
Two-Neutron Alignment in 127Xe
(Springer New York LLC, 2017) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; P.K. Prajapati; S. Rai; P. Popli; M. Singh; S.S. Bhattacharjee; R.P. Singh; S. Muralithar; P. Banerjee; S. Ganguly; S. Kumar; A. Kumar; R. Palit
High spin states in 127Xe have been investigated via 9Be induced fusion-evaporation reaction at 48 MeV. Spin and parity of excited states up to ∼472ℏ have been confirmed from angular correlation and linear polarization results. Rotational alignment of the second pair of h11/2 neutrons has been observed at ℏω∼ 0.44 MeV; beyond that, the band is associated with ν[h11/2]3 configuration. The alignment phenomena has been discussed in comparison with the neighboring 125,129Xe. © 2017, Sociedade Brasileira de Física.
Does chirality exist in nuclei? The case of 102Rh
(Bulgarian Academy of Sciences, 2015) M.S. Yavahchova; D. Tonev; N. Goutev; G. De Angelis; P. Petkov; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mohanto; A. Singh; N. Kaur; R. Garg; A. Sukla; Ts.K. Marinov; S. Brant
Excited states in 102Rh, populated in the fusion-evaporation reaction 94Zr(11B, 3n)102Rh at a beam energy of 36 MeV, were studied using the INGA spectrometer at IUAC, New Delhi. A new chiral candidate sister band was found. Lifetimes of exited states in 102Rh were measured for the first time by means of the Doppler-shift attenuation technique. A new band was found in the level-scheme of 102Rh. 1 band with a negative parity.
Octupole correlations in 1 2 7 i
(World Scientific, 2021) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; A.K. Gupta; A. Kumar; P. Banerjee; S. Ganguly; S. Kumar; R.P. Singh; S. Muralithar
In-beam ?-ray spectroscopy of 127I was carried out following 124Sn(7Li, 4n?) fusion-evaporation reaction at a beam energy of 33 MeV. Ratio of the electric dipole (E1) and electric quadrupole (E2) transition probabilities [B(E1)/B(E2)] for the transitions depopulating from the Ip = 15/2-, 19/2- states have been extracted from this study. Existence of enhanced E1 transition rates between the opposite parity bands, associated dominantly with [402]5/2+ and [550]1/2- configurations, provides an indication of octupole correlations in this nucleus. © 2021 World Scientific Publishing Company.
Incipient reflection asymmetry in 127Xe
(Elsevier B.V., 2023) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; A.K. Gupta; P. Banerjee; S. Ganguly; S. Rai; Pragati; Mayank; S. Kumar; A. Kumar; R. Palit; S.S. Bhattacharjee; R.P. Singh; S. Muralithar
Excited states in 126,127,128Xe were populated via 122Sn(9Be, xnγ) fusion-evaporation reaction at a beam energy of 48 MeV. A positive parity rotational-like sequence of ΔI=2γ-transitions, which is found to decay into the negative parity band via E1 transitions, is observed above Iπ=19/2+ state at 2307 keV in 127Xe. Such enhanced E1 γ-transitions are also observed between the antimagnetic rotational (AMR) and longitudinal wobbling (LW) bands in this nucleus. These indicate the presence of simplex symmetry with s=±i excitation in 127Xe. © 2023 Elsevier B.V.
Possible antimagnetic rotational band in 127Xe
(Institute of Physics Publishing, 2020) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; P. Banerjee; S. Ganguly; S. Rai; Pragati; S. Muralithar; R.P. Singh; S.S. Bhattacharjee; S. Kumar; Mayank; A. Kumar; R. Palit
Excited states of 127Xe were populated in the 122Sn(9Be, 4nγ) fusion-evaporation reaction at a beam energy of 48 MeV. A sequence of ΔI = 2 γ-transitions has been observed above the I π = 19/2+ state at 2307 keV. Spin and parity of the states belonging to this band have been assigned firmly. The dynamic moment of inertia of this band is found to be low and almost constant as a function of angular momentum. Observed experimental features along with the results of theoretical semiclassical model calculation suggest an antimagnetic rotational character for this band. © 2019 IOP Publishing Ltd.
γ-vibration in 126Xe: A revisit
(Elsevier B.V., 2020) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; P. Banerjee; S. Ganguly; S. Rai; Pragati; Mayank; S. Kumar; A. Kumar; R. Palit; S.S. Bhattacharjee; R.P. Singh; S. Muralithar
The electromagnetic properties of the γ-transitions, decaying from the γ-vibrational states of 126Xe, have been studied via 122Sn(9Be, 5nγ) fusion-evaporation reaction at a beam energy of 48 MeV. The level scheme has been updated by placing the 82 +→81 + (ΔI=0) and the 71 +→61 + (ΔI=1) γ-transitions. Spin and parity of several excited states have been assigned on the basis of angular correlation and linear polarization results. Systematic of the γ-band in even-even Xe isotopes has been discussed. © 2019 Elsevier B.V.
A note on the parity of i π = 5 - State in 1 2 6, 1 2 8 Xe
(World Scientific, 2021) S. Chakraborty; H.P. Sharma; S.S. Tiwary; C. Majumder; A.K. Gupta; P. Banerjee; S. Ganguly; S. Rai; Pragati; Mayank; S. Kumar; S.S. Bhattacharjee; R.P. Singh; S. Muralithar; A. Kumar; R. Palit
Excited states in 126,128Xe were populated via 122Sn(9Be, 5nγ) and 122Sn(9Be, 3nγ) fusion-evaporation reactions, respectively, at a beam energy of 48MeV. The electromagnetic (electric or magnetic) nature and multipolarity of some inter-band γ rays are determined from linear polarization and angular correlation measurements. Re-measured/newly measured linear polarization asymmetry helps to assign the parity of 2302-keV (126Xe)/2228-keV (128Xe) Iπ = 5- state unequivocally. © 2021 World Scientific Publishing Company.

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