A5072373630- Nuclear physics research studies
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Astro and Planetary Science
- Astronomical and nuclear sciences
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Solar Radiation and Photovoltaics
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Advanced Chemical Physics Studies
- Scientific Research and Discoveries
- Radiopharmaceutical Chemistry and Applications
- Advanced NMR Techniques and Applications
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Inorganic Fluorides and Related Compounds
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
Colorado School of Mines
2019-2024
Sacred Heart College
2005-2011
Indian Institute of Astrophysics
2006-2007
Improvement Service
2007
Measurements of the elastic scattering cross section $^{3}\mathrm{He}$ and $^{4}\mathrm{He}$ are important in order to improve constraints on theoretical models $^{4}\mathrm{He}(^{3}\mathrm{He},\ensuremath{\gamma})^{7}\mathrm{Be}$, a key reaction Big Bang nucleosynthesis solar neutrino production. The astrophysical $S$ factor for this is significant source uncertainty standard-solar-model prediction $^{7}\mathrm{Be}$ $^{8}\mathrm{B}$ fluxes. measurements reported literature do not extend low...
Background: Globular clusters are known to exhibit anomalous abundance trends such as the sodium-oxygen anticorrelation. This trend is thought arise via pollution of cluster interstellar medium from a previous generation stars. Intermediate-mass asymptotic giant branch stars undergoing hot bottom burning (HBB) prime candidate for producing sodium-rich oxygen-poor material, and then expelling this material strong stellar winds. The amount $^{23}\mathrm{Na}$ produced in environment has been...
In this Letter we report on the first inverse kinematics measurement of key resonances in ${}^{22}\text{Ne}(p,\gamma)^{23}\text{Na}$ reaction which forms part NeNa cycle, and is relevant for ${}^{23}$Na synthesis asymptotic giant branch (AGB) stars. An anti-correlation O Na abundances seen across all well-studied globular clusters (GC), however, reaction-rate uncertainties limit precision as to stellar evolution models can reproduce observed isotopic abundance patterns. Given importance GC...
We have performed the first direct measurement of two resonances ^{7}Be(α,γ)^{11}C reaction with unknown strengths using an intense radioactive ^{7}Be beam and DRAGON recoil separator. report on 1155 1110 keV resonance 1.73±0.25(stat)±0.40(syst) eV 125_{-25}^{+27}(stat)±15(syst) meV, respectively. The present results reduced uncertainty in rate to ∼9.4%-10.7% over T=1.5-3 GK, which is relevant for nucleosynthesis neutrino-driven outflows core-collapse supernovae (νp process). find no effect...
At temperatures below 0.1 GK the $^{19}$F$(p,\gamma)^{20}$Ne reaction is only breakout path out of CNO cycle. Experimental studies this are challenging from a technical perspective due to copious $\gamma$-ray background far stronger $^{19}$F$(p,\alpha)^{16}$O channel. Here we present first inverse kinematics study reaction, in which measure strength 323-keV resonance. We find value $\omega\gamma = 3.3^{+1.1}_{-0.9}$ meV, factor two larger than most recent previous study. The discrepancy...
A possible mechanism to explain the origin of light $p$ nuclei in Galaxy is nucleosynthesis proton-rich neutrino-driven wind ejecta core-collapse supernovas via $\ensuremath{\nu}p$ process. However, this production scenario very sensitive underlying supernova dynamics and nuclear physics input. As far as uncertainties are concerned, breakout from $pp$ chains $^{7}\mathrm{Be}(\ensuremath{\alpha},\ensuremath{\gamma})^{11}\mathrm{C}$ reaction has been identified an important link which can...
Using six years (1969-1974) of data sunspot groups from the white light pictures Kodaikanal Observatory, we compute rotation rates leading and following sunspots rate change longitudinal separation during their life times. We find that (i) spots are associated with abnormal (i.e, greater than 1σ mean rotation) approach at a deg/day also experience minimum (~) foot points course evolution; (ii) have eventually trigger flares; (iii) events approaching distances occur on average between spans,...
Different life spans of sunspots suggest their origin at different depths, and by measuring magnetic fluxes from first observation on the surface, one can estimate strength flux anchoring depths. From SOHO MDI magnetograms, we infer rate emergence depths in solar convective envelope initial well-developed surface. Important findings are: (1) majority spot groups that have surface are bipolar; (2) irrespective sizes, bipolar spots with average field strengths ~500 G during observation; (3)...
Nuclear reaction sensitivity studies have shown that the final isotopic abundance of O-Ne nova nucleosynthesis is dependent on $^{34}\mathrm{S}(p,\ensuremath{\gamma})^{35}\mathrm{Cl}$ at astrophysical energies corresponding to peak burning temperatures 0.1--0.4 GK. Isotopic ratios S, Cl, and Ar products are all used in various methods cosmochemical analysis presolar meteoritic grains. Due lack direct experimental data, $^{34}\mathrm{S}+p$ rate has been estimated using statistical modeling or...
Abstract The production of the p–nuclei is one unsolved puzzles in nuclear astrophysics. A possible mechanism nucleosynthesis neutrino–driven winds core–collapse supernovae (νp–process), but it carries uncertainties, mostly supernova dynamics and physics input. pp-chain breakout reaction 7 Be( α,γ ) 11 C, which occurs prior to explosion, was identified as an important link can influence flow z/p-process final abundances p-nuclei. Nevertheless, its rate poorly known over relevant energy range...