A5057641518- Nuclear physics research studies
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Rare-earth and actinide compounds
- Nuclear Materials and Properties
- Medical Imaging Techniques and Applications
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Radiopharmaceutical Chemistry and Applications
- Magnetic Properties of Alloys
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum, superfluid, helium dynamics
Tata Institute of Fundamental Research
2017-2024
UGC-DAE Consortium for Scientific Research, Kolkata Centre
2019-2023
UGC DAE Consortium for Scientific Research
2019-2023
The low-lying negative parity states in the 133Ba nucleus have been investigated using 124Sn(13C, 4nγ)133Ba reaction at Elab = 48 MeV. With addition of new γ-transitions, nω=0,1,2 wobbling bands were identified this nucleus. angular correlations and linear polarization measurements performed to confirm spin states. Predominant E2 character was obtained for inter-linking ΔI=1 transitions between successive phonon (Δnω=1) bands. transverse nature is concluded on basis observed decreasing...
High-spin states of $^{90}\mathrm{Zr}$ have been investigated using the heavy-ion fusion-evaporation reaction $^{82}\mathrm{Se}(^{13}\mathrm{C},5n)$ at a beam energy 60 MeV. Excited levels observed up to an excitation $\ensuremath{\approx}13$ MeV and spin $\ensuremath{\approx}20\ensuremath{\hbar}$ with addition thirty-two new $\ensuremath{\gamma}$-ray transitions proposed level scheme. Structures both positive- negative-parity highest interpreted shell-model calculations GWBXG interaction...
The quadrupole transition strength $B(E2)$ deduced from the measured level lifetimes using Doppler shift attenuation method with help of Indian National Gamma Array, decreases increasing spin for band interest in $^{82}\mathrm{Kr}$. In addition, ratio dynamic moment inertia value increases along band. Large basis shell-model calculations have been performed to understand microscopic origin interest. experimental results are reproduced well by numerical within framework a semiclassical...
Two opposite parity bands I and II with eight new changing transitions have been identified in $^{79}\mathrm{Se}$ using the fusion-evaporation reaction $^{76}\mathrm{Ge}(^{9}\mathrm{Be}$, $\ensuremath{\alpha}2n$) at ${E}_{\mathrm{Lab}}\ensuremath{\approx}31$ MeV. The $B(M1)$ $B(E2)$ rates of as well $B(E1)$ values linking between two determined from lifetime measurements are compared reflection asymmetric triaxial particle rotor model calculations. large $B(E1)$/$B(E2)$ ratios transition...
High-spin states in $^{89}\mathrm{Zr}$ were populated the $^{80}\mathrm{Se}(^{13}\mathrm{C},4n)$ reaction, and $\ensuremath{\gamma}$-ray coincidences measured using Indian National Gamma Array. The level scheme of has been extended up to spin $I=49/2$ with observation a new dipole band. Directional correlation polarization asymmetries $\ensuremath{\gamma}$ rays have determine parity levels. Line shapes several transitions analyzed lifetimes Possible configurations band discussed cranked...
Excited states of the $^{64}\mathrm{Cu}\phantom{\rule{4pt}{0ex}}(Z=29,N=35)$ nucleus have been probed using heavy-ion-induced fusion evaporation reaction and an array Compton-suppressed Clovers as detection system for emitted $\ensuremath{\gamma}$ rays. More than 50 new transitions identified level scheme has established up to excitation energy ${E}_{x}\phantom{\rule{4pt}{0ex}}\ensuremath{\sim}\phantom{\rule{4pt}{0ex}}6$ MeV spin $\ensuremath{\sim}10\ensuremath{\hbar}$. The experimental...
The $^{137}\mathrm{La}$ nucleus was populated by the reaction $^{130}\mathrm{Te}(^{11}\mathrm{B}, 4n$) at 40-MeV beam energy and lifetime of $11/{2}^{\ensuremath{-}}$ state $1004.6\phantom{\rule{0.28em}{0ex}}\mathrm{keV}$ measured using a hybrid array HPGe clover ${\mathrm{LaBr}}_{3}$(Ce) detectors electronic fast-timing technique, providing value ${T}_{1/2}=263\ifmmode\pm\else\textpm\fi{}12\phantom{\rule{0.28em}{0ex}}\mathrm{ps}$. reduced transition probability...
The $g$ factor of an isomeric state at 2738 keV in $^{135}\mathrm{La}$ has been measured by time differential perturbed angular distribution technique. This isomer was populated the reaction $^{128}\mathrm{Te}(^{11}\mathrm{B}$, $4\mathrm{n})^{135}\mathrm{La}$ beam energy 52 MeV. We performed large-scale shell-model (LSSM) calculations which successfully describe low-lying levels and band structures $^{135}\mathrm{La}$. value factor,$\ensuremath{-}0.049(3)$, compared with LSSM result to...
The low-lying positive-parity structures of $^{82}\mathrm{Kr}$ have been investigated following their population in the $^{76}\mathrm{Ge}(^{9}\mathrm{Be},3n)$ reaction at ${\mathrm{E}}_{\mathrm{lab}}\ensuremath{\approx}31\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$ and using a large array Compton suppressed HPGe clovers as detection setup. Apart from other spectroscopic measurements, level lifetimes states extracted Doppler shift attenuation method. energies associated transition probabilities...
Excited states of the $^{61}\mathrm{Ni}$ ($Z=28,N=33$) nucleus have been probed using heavy-ion-induced fusion evaporation reaction and an array Compton suppressed germanium (clover) detectors as detection system for emitted $\ensuremath{\gamma}$ rays. Seventeen new transitions identified placement six modified with respect to previous measurements, following which level scheme has extended up excitation energy ${E}_{x}\ensuremath{\approx}7$ MeV spin...
The intermediate and high-spin states of the $^{134}\mathrm{Ba}$ nucleus have been investigated up to spin ${I}^{\ensuremath{\pi}}=({20}^{\ensuremath{-}})$ using $^{124}\mathrm{Sn}(^{13}\mathrm{C}, 3n)^{134}\mathrm{Ba}$ reaction at a beam energy 48 MeV. ${R}_{\mathrm{DCO}}$ polarization asymmetry measurements were carried out assign parity levels. Three ($\mathrm{\ensuremath{\Delta}}I=2$) negative bands studied above 1985.9 keV level having ${I}^{\ensuremath{\pi}}={5}^{\ensuremath{-}}$. two...
Evaporated $\alpha$-spectra have been measured in coincidence with low energy discrete $\gamma$-rays from residual nucleus $^{68}$Zn populated the reaction $^{64}$Ni($^9$Be,$\alpha$n)$^{68}$Zn at $E(^9$Be) = 30 MeV producing $^{73}$Ge compound nucleus. Low $\gamma$-gated $\alpha$-particle spectra, for first time, used to extract nuclear level density (NLD) intermediate $^{69}$Zn excitation range of E $\approx$ 5-20 MeV. The slope NLD as a function matches nicely determined RIPL estimates...
The high-spin states in $^{133}\mathrm{Cs}$, populated using the reaction $^{130}\mathrm{Te}(^{7}\mathrm{Li},4n)$ with 45-MeV beam energy, have been extended up to an excitation energy of 5.265 MeV Indian National Gamma Array. observed one- and three-quasiparticle bands built on $\ensuremath{\pi}{h}_{11/2},\phantom{\rule{0.28em}{0ex}}\ensuremath{\pi}{g}_{7/2}$, $\ensuremath{\pi}{d}_{5/2}$;...
The excitation scheme of the $^{63}\mathrm{Cu}$ nucleus has been probed following its population in a light-ion induced fusion-evaporation reaction and using an array Compton suppressed HPGe clover detectors as detection system. Apart from ascribing $\ensuremath{\gamma}$-ray transitions to level nucleus, through $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence measurements, identifying new process, measurements angular correlation linear polarization...
The $\ensuremath{\gamma}$-gated proton spectra measured in the reactions $^{64}\mathrm{Ni}(^{9}\mathrm{Be},\mathrm{p}2\mathrm{n})^{70}\mathrm{Ga}$ and $^{64}\mathrm{Ni}(^{9}\mathrm{Be},\mathrm{pn})^{71}\mathrm{Ga}$, have been utilized to probe collective enhancement nuclear level density (NLD) of two oblate deformed nuclei $^{71}\mathrm{Ga}$ $^{72}\mathrm{Ga}$. It is seen that spectrum are reasonably explained by using large value inverse parameter ($k=11.2$ MeV) NLD prescription Fermi gas...
We report measurement of the $g$-factor for ${11/2}^{\ensuremath{-}}$ isomeric state at 535 keV in $^{133}\mathrm{La}$, employing time differential perturbed angular distribution technique (TDPAD). This isomer was populated reaction $^{126}\mathrm{Te}(^{11}\mathrm{B}$, $4n)^{133}\mathrm{La}$ beam energy 52 MeV. From observed nuclear spin precession, analysed through combined, magnetic dipole and electric quadrupole hyperfine interactions, we obtain $g$ factor $11/{2}^{\ensuremath{-}}$ as...
High-spin excited states of $^{135}\mathrm{Pm}$ have been investigated using the $^{107}\mathrm{Ag}(^{32}\mathrm{S}$, $2p2n$) reaction at 145-MeV beam energy. Three negative-parity bands up to $\ensuremath{\sim}9.0\ensuremath{-}$, $7.6\ensuremath{-}$, and $6.9\ensuremath{-}\mathrm{MeV}$ excitation energies with spin parities $(55/{2}^{\ensuremath{-}})$, $(49/{2}^{\ensuremath{-}})$, $(47/{2}^{\ensuremath{-}})\phantom{\rule{4pt}{0ex}}\ensuremath{\hbar}$, respectively. The experimental results...
Levels in the 112Sn nucleus have been excited by inelastic scattering with 35Cl projectile at Elab=195MeV. The Doppler affected γ-ray peak arising from decay of 2+1 level has analyzed, using updated methodologies, to extract lifetime and corresponding electric quadrupole (E2) transition probability, B(E2;0+g.s.→2+1). present result is discrepant respect results reported existing measurements, but compliance independent systematic measurements low-lying E2 strengths stable even-mass Sn...
Background: There has been a considerable interest focused on the study of enhancement or suppression in collectivity excited ${2}_{1}^{+}$ states stable Sn isotopes. Independent measurements Coulomb excitation cross sections and level lifetimes report discrepant transition probabilities. Existing estimates for lifetime indicate reduced collectivity.Purpose: A reexamination state most abundant $^{120}\mathrm{Sn}$ isotope is thus warranted. The same carried out present work result used to...
We have characterized a Cerium doped Lanthanum Bromide (LaBr 3 (Ce) ) crystal coupled with the position-sensitive photo-multiplier system for gamma-ray imaging application. One can use this detector set-up scanning of high purity germanium detectors pulse shape analysis in spectroscopy experiments and image formation an object by Compton back-scattering . The sensor has been tested energy, timing position information gamma-rays interacting within crystal. GEANT4 simulation results are...