A5054000612- Nuclear physics research studies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Rare-earth and actinide compounds
- Ion-surface interactions and analysis
- Chemical Thermodynamics and Molecular Structure
- Gender Diversity and Inequality
- Cold Fusion and Nuclear Reactions
- Crystal Structures and Properties
- Advanced Chemical Physics Studies
- Graphite, nuclear technology, radiation studies
- Indian Economic and Social Development
- Boron Compounds in Chemistry
- Radioactive contamination and transfer
- Innovation and Socioeconomic Development
- Electron and X-Ray Spectroscopy Techniques
- Fusion materials and technologies
- Neutrino Physics Research
- Laser-induced spectroscopy and plasma
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
University of Delhi
2007-2021
Teerthanker Mahaveer University
2021
Universidade de Santiago de Compostela
2009-2015
Panjab University
2015
Hungarian Academy of Sciences
2013
Fusion excitation functions and angular distributions of evaporation residues (ERs) have been measured for $^{28}\mathrm{Si}+^{90,94}\mathrm{Zr}$ systems around the Coulomb barrier using recoil mass spectrometer, Heavy Ion Reaction Analyzer (HIRA). For both systems, experimental fusion cross sections are strongly enhanced compared to predictions one-dimensional penetration model (1-d BPM) below barrier. Coupled channels formalism has employed theoretically explain observed sub-barrier...
This Letter reports on a systematic study of β-decay half-lives neutron-rich nuclei around doubly magic Pb208. The lifetimes the 126-neutron shell isotone Pt204 and neighboring Ir200–202, Pt203, Au204 are presented together with other 19 measured during "stopped beam" campaign rare isotope investigations at GSI collaboration. results constrain main nuclear theories used in calculations r-process nucleosynthesis. Predictions based statistical macroscopic description first-forbidden β strength...
Evaporation residue cross sections and spin distributions have been measured for $^{200}\mathrm{Pb}$ compound nucleus formed in $^{16}\mathrm{O}+^{184}\mathrm{W}$ reaction at the laboratory beam energies of 84, 92, 100, 108, 116, 120 MeV. The evaporation residues selected using recoil mass spectrometer, HIRA detected a 2D position sensitive silicon detector. by detecting gamma rays with 14 element BGO multiplicity filter. Measured are compared values predicted standard statistical model...
Quasi-elastic-scattering and transfer reaction cross-section measurements were made for the $^{7}\mathrm{Be}+^{27}\mathrm{Al}$ system at ${E}_{\mathrm{lab}}=17$, 19, 21 MeV in angular range ${\ensuremath{\theta}}_{c.m.}={12}^{\ifmmode^\circ\else\textdegree\fi{}}\ensuremath{-}{43}^{\ifmmode^\circ\else\textdegree\fi{}}$. An optical model (OM) analysis of quasi-elastic scattering data was carried out. The fusion cross sections derived these energies by subtraction integrated from obtained fits...
We have studied the β decay of Tz=−1,f7/2 shell nuclei Ni54,Fe50,Cr46, and Ti42 produced in fragmentation reactions. The proton separation energies daughter Tz=0 are relatively large (≈4–5 MeV) so studies γ rays essential. experiments were performed at GSI as part Stopped-beam campaign with RISING setup consisting 15 Euroball Cluster Ge detectors. From newly obtained high precision β-decay half-lives, excitation energies, branching ratios, we able to extract Fermi Gamow-Teller transition...
The nuclear structure of neutron-rich N>126 nuclei has been investigated following their production via relativistic projectile fragmentation a E/A=1 GeV 238U beam. Metastable states in the N=128 isotones 208Hg and 209Tl have identified. Delayed γ-ray transitions are interpreted as arising from decay Iπ=(8+) (17/2+) isomers, respectively. data allow for so far most comprehensive verification shell-model approach region determined by magic numbers Z<82 N>126.Received 1 October...
Background: It is a well established fact that nuclear deformation and vibration influence fusion dynamics around the Coulomb barrier. This effect was observed for several systems with inclusion of inelastic excitations in coupled-channels calculations. Sub-barrier cross sections were also to be affected by neutron transfer carrying positive $Q$ value channels. However, recent experimental analysis few showed are enough explain sub-barrier behavior, no noticed due $Q$-value channels.Purpose:...
The $\ensuremath{\beta}$ decay of five heavy, neutron-rich nuclei, ${}^{203,204}$Pt and ${}^{200\ensuremath{-}202}$Ir, has been investigated following relativistic cold fragmentation reactions lead projectiles using the FRS+RISING setup at GSI. This paper reports on study low-lying states in daughter nuclei ${}^{203,204}$Au ${}^{200\ensuremath{-}202}$Pt. characteristic $\ensuremath{\gamma}$ rays for each nucleus have determined $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-ray...
The production cross sections of four $N=127$ isotones (${}^{207}$Hg, ${}^{206}$Au, ${}^{205}$Pt, and ${}^{204}$Ir) have been measured using ($p$,$n$) charge-exchange reactions, induced in collisions a ${}^{208}$Pb primary beam at 1 A GeV with Be target. These data allow one to investigate the use reaction mechanism extend limits chart nuclides toward important $r$-process nuclei region third peak elemental abundance distribution.
Measurements on multinucleon transfer reactions for $^{28}\mathrm{Si}+^{90,94}\mathrm{Zr}$ systems were performed at sub- and near-barrier energies. The fact that $^{90}\mathrm{Zr}$ has a closed neutron shell ($N$ $=$ 50) $^{94}\mathrm{Zr}$ four neutrons outside the shell, allows us to investigate effects of closure pairing correlation mechanism. experiment was with pulsed $^{28}\mathrm{Si}$ beam using Heavy Ion Reaction Analyzer (HIRA) Inter University Accelerator Centre (IUAC), New Delhi....
Evaporation residue (ER) cross sections for the $^{16,18}\mathrm{O}+^{198}\mathrm{Pt}$ reactions are measured in order to investigate fission hindrance. Compound nuclei ($^{214,216}\mathrm{Rn}$) formed above fusion at excitation energies range of 40--68 MeV. The experimental ER compared with predictions from statistical model calculations compound nuclear decay where Kramers' width is used. strength dissipation treated as a free parameter fit data.
Search for a new kind of superfluidity built on collective proton-neutron pairs with aligned spin is performed studying the Gamow-Teller decay T=1, J(π)=0+ ground state (62)Ge into excited states odd-odd N=Z nucleus (62)Ga. The experiment at GSI Helmholtzzentrum für Shwerionenforshung ions selected by fragment separator and implanted in stack Si-strip detectors, surrounded RISING Ge array. A half-life T1/2=82.9(14) ms measured state. Six (62)Ga, populated below 2.5 MeV through transitions,...
Background: The influence of inelastic excitations on sub-barrier fusion enhancement is well established; however, the transfer channel effect can be surprising. Recently, it has been shown that $2n$ mainly responsible for despite having a positive-$Q$ value many-neutron channels. Moreover, some systems do not show even if they possess positive-$Q$-value It also reported found in those which deformation nuclei increases after neutron transfer.Purpose: aim this work to examine role...
The pre- and post-scission neutron multiplicities are measured for the fission of 208Rn, populated with reactions 30Si+178Hf 48Ti+160Gd in excitation energy range 54.5 - 80.8 MeV. We found significant differences pre-scission these two systems. Also, both exhibit an enhancement multiplicity respect to existing data 16O+194Pt reaction populating 210Rn. compared theoretical predictions obtained from Langevin dynamical model fission. Dynamical simulations also performed estimate capture...
The light-particle emission probability from an excited compound nucleus depends explicitly on the time-evolution of system as available internal excitation energy and, consequently, particle decay widths depend instantaneous deformation nucleus. Langevin dynamical model for fission is employed to extract this dependence in pre-scission multiplicities by following propagation fissioning trajectories up scission. variation with nuclear accounted more precisely comparison existing...
Measurements of angular distributions for one- and two-proton stripping reactions ${}^{28}$Si $+$ ${}^{90,94}$Zr systems were performed at 120 MeV. The experiment was carried out with the beam Inter University Accelerator Center, New Delhi. theoretical calculations using quantum mechanical coupled reaction channels code fresco. distorted wave Born approximation reproduced experimental one-proton transfer channel both reasonably well but failed channel. Coupled including various intermediate...
Excited states in $^{135}\mathrm{Pr}$ have been investigated using the reaction $^{123}\mathrm{Sb}(^{16}\mathrm{O},4n)^{135}\mathrm{Pr}$ at an incident beam energy of 82 MeV. The partial level scheme has established for negative-parity with addition new $\ensuremath{\gamma}$-ray transitions. directional correlation and polarization measurements performed to assign spin parity most reported At high spin, a dipole band $(\mathrm{\ensuremath{\Delta}}I=1)$ along observation crossover $E2$ Tilted...
High spin states in ${}^{135}$La have been investigated using the ${}^{128}$Te(${}^{11}$B,$4n$)${}^{135}$La reaction at a beam energy of 50.5 MeV Indian National Gamma Array (INGA). The level scheme has confirmed and extended both for low high with observation several new transitions. Directional Correlations Oriented (DCO) ratios linear polarization measurements performed to assign spin-parity most reported $\ensuremath{\gamma}$ A positive parity band observed identified as decoupled...
Fusion cross-section measurements were performed for system 40 Ca + 70 Zn around the Coulomb barrier energies using Heavy Ion Reaction Analyzer (HIRA).The observed enhancement in experimental fusion cross-sections was investigated via coupled-channels formalism.The coupling of inelastic excitations alone could not reproduce data, however, effect octupole state projectile to be significant.The multi-neutron positive Q-value transfer channels also included calculations semi-classical model.It...
Angular distribution for $^{7}\mathrm{Be}+^{7}\mathrm{Li}$ elastic scattering has been measured using a $^{7}\mathrm{Be}$ radioactive beam at the Nuclear Science Center, New Delhi, ${E}_{c.m.}=9.87$ and 8.87 MeV. A compact highly efficient detector system in kinematic coincidence mode an in-vacuum target transfer have developed to minimize contributions from unwanted channels. The angular ranges covered were...