A5089705342- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Advanced Chemical Physics Studies
- Neutrino Physics Research
- Astro and Planetary Science
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Rare-earth and actinide compounds
- Methane Hydrates and Related Phenomena
- Inorganic Fluorides and Related Compounds
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
Indian Institute of Technology Roorkee
2016-2025
University of Jyväskylä
2020-2023
UGC DAE Consortium for Scientific Research
2022-2023
UGC-DAE Consortium for Scientific Research, Kolkata Centre
2022-2023
Nihon University
2020
Centre National de la Recherche Scientifique
2009-2018
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2018
GANIL
2009-2018
Institut National de Physique Nucléaire et de Physique des Particules
2009-2017
Institute of Nuclear Physics
2016
The two protons emitted in the decay of 54Zn have been individually observed for first time a projection chamber. total energy and half-life measured this work agree with results obtained previous experiment. Angular correlations between are determined compared to theoretical distributions three-body model. Within shell model framework, relative probabilities show strong contribution p2 configuration two-proton emission. After 45Fe, present result on constitutes only second case direct...
The gallium anomaly, i.e. the missing electron-neutrino flux from 37Ar and 51Cr electron-capture decays as measured by GALLEX SAGE solar-neutrino detectors, has been among us already for about two decades. We present here a new estimate of significance this anomaly based on cross-section calculations using nuclear shell-model wave functions obtained exploiting recently developed two-nucleon interactions. experiments is found to be smaller than that in previous evaluations, decreasing 3.0σ...
Forbidden nonunique $\ensuremath{\beta}$ decays feature shape functions that are complicated combinations of different nuclear matrix elements and phase-space factors. Furthermore, they depend in a very nontrivial way on the values weak coupling constants, ${g}_{\mathrm{V}}$ for vector part ${g}_{\mathrm{A}}$ axial-vector part. In this work we include also usually omitted second-order terms to see their effect computed decay half-lives electron spectra ($\ensuremath{\beta}$ spectra). As...
A significant fraction of stars between 7 and 11 solar masses are thought to become supernovae, but the explosion mechanism is unclear. The answer depends critically on rate electron capture Ne20 in degenerate oxygen-neon stellar core. However, because unknown strength transition ground states F20, it has not previously been possible fully constrain rate. By measuring transition, we establish that its exceptionally large enhances by several orders magnitude. This a decisive impact evolution...
High-spin states of $^{91}\mathrm{Nb}$ have been investigated using the heavy-ion fusion-evaporation reaction $^{65}\mathrm{Cu}(^{30}\mathrm{Si}$, $2p2n)$ at a beam energy 120 MeV. States up to excitation $\ensuremath{\approx}12$ MeV and spin $41/2\phantom{\rule{4pt}{0ex}}\ensuremath{\hbar}$ observed with addition thirteen new $\ensuremath{\gamma}$-ray transitions proposed level scheme. Structures positive- negative-parity highest interpreted shell-model calculations GWBXG interaction...
We investigate the ${\ensuremath{\beta}}^{\ensuremath{-}}$-decay properties of $N=125$ and $N=126$ isotones with $Z=52--79$ through large-scale shell model calculations, considering both Gamow-Teller first-forbidden transitions. observed that distributions GT strength exhibit a prominent peak at lower excitation energies, making substantial contribution to resulting half-lives. This peak, dominated by $\ensuremath{\nu}0{h}_{9/2}\ensuremath{\rightarrow}\ensuremath{\pi}0{h}_{11/2}$ transition,...
Large-scale shell-model calculations are performed for the $9/2^+_{\rm g.s.}$, $1/2^-_1$, $3/2^-_1$, and $5/2^-_1$ states in odd-$A$ indium isotopes with $N=50-82$. The calculated energy levels, electromagnetic moments, spectroscopic factors exhibit remarkable agreement experimental data due to significant configuration mixing neutron numbers away from closed shells. While $1/2^-_1$ levels well follow those of effective single-particle energies that formulated fractional occupancies...
High-spin states in 217Ac are reported up to 3.9-MeV excitation energy and 𝐼𝜋=41/2+ where 22 transitions newly observed. The structure of the yrast near-yrast below 29/2+ isomer is revisited. level above established with firm spin parity assignments. Large-basis shell-model calculations Kuo-Herling particle effective interaction performed compare experimentally observed energies theoretical predictions. A comparison systematics 𝑁=128 isotones suggests that structures result from a weak...
In the noisy intermediate-scale quantum era, variational algorithms have become a standard approach to solving many-body problems. Here, we present eigensolver results of selected oxygen isotopes within shell-model description. The aim work is locate neutron drip line chain using unitary coupled cluster type Ans\"atze with different microscopic interactions (DJ16, JISP16, and N3LO), in addition phenomenological USDB interaction. While initially infeasible execute on contemporary hardware,...
In the present work we calculate allowed -decay half-lives of nuclei with and N 50 systematically under framework nuclear shell model. A recent study shows that some in this region belong to island inversion. We perform calculation for fp using KB3G effective interaction. case Ni, Cu, Zn, used JUN45 Theoretical results Q values, half-lives, excitation energies, logft branching fractions are discussed compared experimental data. Ni region, also our calculated data (Xu et al 2014 Phys. Rev....
We have performed a systematic study of the log$ft$ values, shape factors and electron spectra for second-forbidden nonunique $\beta^-$ decays $^{24}$Na$(4^+) \rightarrow ^{24}$Mg$(2^+)$ $^{36}$Cl$(2^+) ^{36}$Ar$(0^+)$ transitions under framework nuclear shell model. model calculations in $sd$ space, using more recent microscopic effective interactions such as Daejeon16, chiral N3LO, JISP16. These are derived from no-core wave functions Okubo-Lee-Suzuki transformation.For comparison, we also...
We present a systematic study of the $^{10-14}\text{C}$ isotopes within \textit{ab initio} no-core shell model theory. apply four different realistic nucleon-nucleon (NN) interactions: (i) charge-dependent Bonn 2000 (CDB2K) potential (ii) inside non-local outside Yukawa (INOY) (iii) next-to-next-to-next-to-leading order (N$^3$LO) potential, and (iv) optimized next-to-next-to-leading (N$^2$LO$_{opt}$) potential. report low-lying energy spectra both positive negative parity states for...
The $T_z$~=~$-\frac{3}{2}$ nucleus ${}^{21}$Mg has been studied by Coulomb excitation on ${}^{196}$Pt and ${}^{110}$Pd targets. A 205.6(1)-keV $\gamma$-ray transition resulting from the of $\frac{5}{2}^+$ ground state to first excited $\frac{1}{2}^+$ in was observed for time. cross-section measurements with both targets a measurement half-life yield an adopted value $B(E2;\frac{5}{2}^+\rightarrow\frac{1}{2}^+)$~=~13.3(4)~W.u. new at 1672(1)~keV tentative $\frac{9}{2}^+$ assignment also...
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...
We report a comprehensive shell-model study of the $logft$ values for forbidden ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay transitions in region northeast $^{208}\mathrm{Pb}$. For this we have considered $^{210\text{--}215}\mathrm{Pb}$ $\ensuremath{\rightarrow}$ $^{210\text{--}215}\mathrm{Bi}$ and $^{210\text{--}215}\mathrm{Po}$ transitions. performed calculation using KHPE interaction valence shells 82-126 protons 126-184 neutrons without any truncation. also calculated half-lives $Q$...
The atomic mass relations among the triplet $^{96}\mathrm{Zr}$, $^{96}\mathrm{Nb}$, and $^{96}\mathrm{Mo}$ have been determined by means of high-precision measurements using JYFLTRAP spectrometer at IGISOL facility University Jyv\"askyl\"a. We report $Q$ values for $^{96}\mathrm{Zr}$ single double $\ensuremath{\beta}$ decays to $^{96}\mathrm{Nb}$ $^{96}\mathrm{Mo}$, as well value decay which are ${Q}_{\ensuremath{\beta}}(^{96}\mathrm{Zr})=163.96(13)$,...
Gamma-ray spectroscopy and lifetime measurements using the Doppler shift attenuation method (DSAM) were performed on nucleus $^{28}\mathrm{Mg}$ near $N=20$ ``island of inversion,'' which was populated a $^{12}\mathrm{C}(^{18}\mathrm{O},2\mathrm{p})^{28}\mathrm{Mg}$ fusion-evaporation reaction to investigate impact shell evolution its high-lying structure. Three new levels identified at 7203(3), 7747(2), 7929.3(12) keV along with several gamma rays. A newly extracted...
The excited states of $^{209}\mathrm{Rn}$ ($Z=86, N=123$) have been populated by the heavy-ion induced fusion evaporation reaction $^{198}\mathrm{Pt}(^{16}\mathrm{O},5n)^{209}\mathrm{Rn}$ at a beam energy 102 MeV. de-excited $\ensuremath{\gamma}$ rays were detected with Compton suppressed clover HPGe detectors Indian National Gamma Array (INGA) set-up. high spin spectroscopic study has carried out up to an excitation 7.9 MeV and (55/2)$\ensuremath{\hbar}$. Spin-parity assignments levels...
Near yrast states in ${}^{89}$Zr were investigated up to high spin using the fusion evaporation reaction ${}^{80}$Se(${}^{13}$C, 4$n$) at an incident beam energy of 50 MeV. Excited levels have been observed $\ensuremath{\sim}$10 MeV excitation and $\ensuremath{\sim}$37/2$\ensuremath{\hbar}$ prompt gamma spectroscopy technique with Indian National Gamma Array (INGA). The angular distribution, directional correlation, polarization measurements carried out assign parity newly reported states....
We report the first detection of second-forbidden, nonunique, 2+→0+, ground-state transition in β decay 20F. A low-energy, mass-separated 20F+ beam produced at IGISOL facility Jyväskylä, Finland, was implanted a thin carbon foil and spectrum measured using magnetic transporter plastic-scintillator detector. The β-decay branching ratio inferred from measurement is bβ=[0.41±0.08(stat)±0.07(sys)]×10−5 corresponding to logft=10.89(11), making this one strongest nonunique transitions ever...
We report a comprehensive study of $^{10-14}$B isotopes within the \textit{ab-initio} no-core shell model (NCSM) using realistic nucleon-nucleon (\textit{NN}) interactions. In particular, we have applied inside non-local outside Yukawa (INOY) interaction to energy spectra, electromagnetic properties and point-proton radii boron isotopes. The NCSM results with charge-dependent Bonn 2000 (CDB2K), chiral next-to-next-to-next-to-leading order (N$^3$LO) optimized next-to-next-to-leading...