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NSR database version of April 11, 2024.

Search: Author = N.G.Kelkar

Found 36 matches.

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2023PE02      J.Phys.(London) G50, 015203 (2023); Erratum J.Phys.(London) G50, 099501 (2023)

J.E.Perez Velasquez, O.L.Caballero, N.G.Kelkar

Alpha decay of thermally excited nuclei

RADIOACTIVITY 212Po(α); calculated T1/2 for temperatures ranging from T=0-2.4 GK using the standard scheme of a tunneling decay where the α particle tunnels through the potential barrier formed by its interaction with the daughter nucleus.

doi: 10.1088/1361-6471/aca03c
Citations: PlumX Metrics


2023PE13      J.Phys.(London) G50, 098001 (2023)

J.E.Perez Velasquez, N.G.Kelkar, O.L.Caballero

Reply to comment on "Alpha decay of thermally excited nuclei"

RADIOACTIVITY 212Po, 214Rn, 215Fr, 216Ra(α); calculated T1/2 as a function of temperature within the statistical approach.

doi: 10.1088/1361-6471/ace63b
Citations: PlumX Metrics


2022RO06      Phys.Rev. C 105, 034311 (2022)

D.F.Rojas-Gamboa, J.E.Perez Velasquez, N.G.Kelkar, N.J.Upadhyay

Manifestation of deformation and nonlocality in α and cluster decay

RADIOACTIVITY 222Ra(α), (14C); 223Ra(α), (14C); 228Th(α), (20O); 231Pa(α), (23F); 232U(α), (24Ne); 233U(α), (24Ne), (28Mg); 235U(α), (25Ne), (28Mg); 237Np(α), (30Mg); 236Pu(α), (28Mg); 241Am(α), (34Si); 242Cm(α), (34Si); calculated T1/2, preformation factors, penetration probabilities, half-life dependence on deformation. Studied the nonlocality effects with 2 different nuclear potential models - the energy-independent but angular momentum-dependent Mumbai potential and the energy-dependent Perey-Buck (PB) potential.

doi: 10.1103/PhysRevC.105.034311
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2022RO18      Nucl.Phys. A1028, 122524 (2022)

D.F.Rojas-Gamboa, N.G.Kelkar, O.L.Caballero

Temperature dependence of cluster decay

RADIOACTIVITY 222Ra(14C), 228Th(20O), 231Pa(23F), 232,233U(24Ne), 235U(25Ne), 237Np(30Mg), 236Pu(28Mg); calculated temperature-dependent cluster decay T1/2 within a preformed cluster model.

doi: 10.1016/j.nuclphysa.2022.122524
Citations: PlumX Metrics


2020KE02      Nucl.Phys. A996, 121698 (2020)

N.G.Kelkar, D.Bedoya Fierro, H.Kamada, M.Skurzok

Study of the N* momentum distribution for experimental η-mesic 3He searches

doi: 10.1016/j.nuclphysa.2020.121698
Citations: PlumX Metrics


2019KE07      Int.J.Mod.Phys. E28, 1950066 (2019)

N.G.Kelkar, H.Kamada, M.Skurzok

N-N-N* model calculations for experimental η-mesic 3He searches

NUCLEAR STRUCTURE 3He; calculated momentum distributions, N*NN bound states parameters.

doi: 10.1142/S0218301319500666
Citations: PlumX Metrics


2019PE07      Phys.Rev. C 99, 024308 (2019)

J.E.Perez Velasquez, N.G.Kelkar, N.J.Upadhyay

Assessment of nonlocal nuclear potentials in α decay

RADIOACTIVITY 106Te, 144Nd, 168Pt, 180W, 210,212Po, 254Fm(α); calculated strong interaction potential between α particle and daughter nucleus, T1/2, percentage decrease in α decay half-lives using three different models (Mumbai, Sao Paulo and Perey-Buck) of nonlocality, and cluster preformation probability using non-local interaction with density-dependent double-folding model. Comparison with experimental values. Use of α-decay half-lives as a complementary tool for constraining the nonlocality models.

doi: 10.1103/PhysRevC.99.024308
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2018SK04      Phys.Lett. B 782, 6 (2018)

M.Skurzok, P.Moskal, N.G.Kelkar, S.Hirenzaki, H.Nagahiro, N.Ikeno

Constraining the optical potential in the search for η-mesic 4He

NUCLEAR REACTIONS 2H(d, 3He), E not given; calculated σ; deduced optical potential parameters. Comparison with experimental data.

doi: 10.1016/j.physletb.2018.04.047
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2016KE04      J.Phys.(London) G43, 105102 (2016)

N.G.Kelkar, M.Nowakowski

Signature of the N = 126 shell closure in dwell times of alpha-particle tunneling

NUCLEAR STRUCTURE 200,202,204,206,208,210,212,214,216Po; calculated alpha-nucleus potential, tunneling parameters.

doi: 10.1088/0954-3899/43/10/105002
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2016KE05      Eur.Phys.J. A 52, 309 (2016)

N.G.Kelkar

Momentum distribution of N* in nuclei

doi: 10.1140/epja/i2016-16309-5
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2014KE01      Phys.Rev. C 89, 014602 (2014)

N.G.Kelkar, M.Nowakowski

Tunneling times and bremsstrahlung in α decay

RADIOACTIVITY 210Po(α); calculated bremsstrahlung emission probability, sensitivity of the photon emission probability to nuclear potential. Semiclassical model based on quantum tunneling time concepts using realistic double-folded nuclear and Coulomb potentials. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.014602
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2012GA07      J.Phys.(London) G39, 035103 (2012)

F.Garcia Daza, N.G.Kelkar, M.Nowakowski

Breit equation with form factors in the hydrogen atom

ATOMIC PHYSICS H; calculated hyperfine potential and splitting in muonic hydrogen, electromagnetic form factors. Comparison with available data.

doi: 10.1088/0954-3899/39/3/035103
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2009UP01      Nucl.Phys. A824, 70 (2009)

N.J.Upadhyay, N.G.Kelkar, B.K.Jain

Eta meson rescattering effects in the p + 6Li → η + 7Be reaction near threshold

NUCLEAR REACTIONS 6Li(p, 7Be), E=658.8-683 MeV; calculated σ, σ(θ) using a cluster model and including final state interactions effects.

doi: 10.1016/j.nuclphysa.2009.03.010
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2007KE10      Phys.Rev. C 76, 064605 (2007)

N.G.Kelkar, H.M.Castaneda

Critical view of WKB decay widths

NUCLEAR STRUCTURE 271Sg, 273Ds, 274Rg, 275Hs, 277Cn, 286Fl, 293Lv, 294Og; calculated half-lives, decay widths, vibrational energies using WKB approximation. Compared to other models and experiment.

RADIOACTIVITY 271Sg, 273Ds, 274Rg, 275Hs, 277Cn, 286Fl, 293Lv, 294Og(α); calculated half-lives and compared with experimental data.

doi: 10.1103/PhysRevC.76.064605
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2007KH18      Phys.Rev. C 76, 069801 (2007)

K.P.Khemchandani, N.G.Kelkar, B.K.Jain

Comment on "Hadronic 3Heη production near threshold"

NUCLEAR REACTIONS 2H(p, X)3He/η, E=1.581-1.665 GeV/c; analyzed cross sections.

doi: 10.1103/PhysRevC.76.069801
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2007UP01      Phys.Rev. C 75, 054002 (2007)

N.J.Upadhyay, K.P.Khemchandani, B.K.Jain, N.G.Kelkar

Study of the pd → pdη reaction

doi: 10.1103/PhysRevC.75.054002
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2006JA13      Pramana 66, 753 (2006)

B.K.Jain, N.G.Kelkar, K.P.Khemchandani

Hadron production near threshold

NUCLEAR REACTIONS 1H(p, pK+X), E=2.3 GeV; calculated Λ hyperon production associated invariant mass spectra, final-state interaction effects. 2H(p, X)3He, E ≈ threshold; calculated η meson production spin-averaged amplitude, final-state interaction effects.

doi: 10.1007/BF02704804
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2006KE02      J.Phys.(London) G32, L19 (2006)

N.G.Kelkar, K.P.Khemchandani, B.K.Jain

Possible η-mesic 3He states within the finite rank approximation

NUCLEAR STRUCTURE 3He; calculated η-mesic resonance and bound-state features.

doi: 10.1088/0954-3899/32/3/L01
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2006KE06      J.Phys.(London) G32, 1157 (2006)

N.G.Kelkar, K.P.Khemchandani, B.K.Jain

ηN scattering lengths favour ηd and ηα states

NUCLEAR STRUCTURE 2H, 4He; analyzed transition matrices for η-meson elastic scattering; deduced resonance features.

doi: 10.1088/0954-3899/32/8/007
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2006KH05      Pramana 66, 791 (2006)

K.P.Khemchandani, N.G.Kelkar, M.Nowakowski, B.K.Jain

Resonances in η-light nucleus systems

doi: 10.1007/BF02704807
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2006NO07      Phys.Rev. C 74, 024323 (2006)

M.Nowakowski, N.G.Kelkar, T.Mart

Neutron structure effects in the deuteron and one neutron halos

NUCLEAR STRUCTURE 2H, 11Be; calculated binding-energy corrections arising from neutron electromagnetic form factors.

doi: 10.1103/PhysRevC.74.024323
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2004KE01      Nucl.Phys. A730, 121 (2004)

N.G.Kelkar, M.Nowakowski, K.P.Khemchandani, S.R.Jain

Time delay plots unflavoured baryons

doi: 10.1016/j.nuclphysa.2003.10.018
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2004KE12      Phys.Rev. C 70, 024601 (2004)

N.G.Kelkar, M.Nowakowski, K.P.Khemchandani

Hidden evidence of nonexponential nuclear decay

RADIOACTIVITY 8Be(α); analyzed survival probability, α-α phase shifts; deduced nonexponential decay.

doi: 10.1103/PhysRevC.70.024601
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2003KE02      J.Phys.(London) G29, L1 (2003)

N.G.Kelkar

Time advancement in resonance regions of πN scattering

doi: 10.1088/0954-3899/29/2/101
Citations: PlumX Metrics


2003KE07      J.Phys.(London) G29, 1001 (2003)

N.G.Kelkar, M.Nowakowski, K.P.Khemchandani

Time delayed K+N reactions and exotic baryon resonances

doi: 10.1088/0954-3899/29/6/303
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2003KE09      Nucl.Phys. A724, 357 (2003)

N.G.Kelkar, M.Nowakowski, K.P.Khemchandani

Collisions times in π π and π K scattering and spectroscopy of meson resonances

doi: 10.1016/S0375-9474(03)01555-0
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2003KH14      Phys.Rev. C 68, 064610 (2003)

K.P.Khemchandani, N.G.Kelkar, B.K.Jain

Three-body mechanism of η production

NUCLEAR REACTIONS 2H(p, 3HeX), E=930-1100 MeV; calculated η meson production associated σ(θ), final state interaction effects. Three-body mechanism, two-step model, comparison with data.

doi: 10.1103/PhysRevC.68.064610
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2002KH11      Nucl.Phys. A708, 312 (2002)

K.P.Khemchandani, N.G.Kelkar, B.K.Jain

Study of the η-Nucleus Interaction in the pd → 3He η Reaction Near Threshold

NUCLEAR REACTIONS 2H(p, X)3He, E ≈ 890-903 MeV; calculated, analyzed η-meson production associated σ(θ), σ; deduced η-nucleus final state interaction features.

doi: 10.1016/S0375-9474(02)01025-4
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2001KE19      Pramana 57, 389 (2001)

N.G.Kelkar, B.K.Jain

Hyperon Production in pp Collisions

NUCLEAR REACTIONS 1H(p, K+X), E=2.3 GeV; calculated hyperon production associated invariant mass spectra. Coupled channels approach, comparison with data.

doi: 10.1007/s12043-001-0048-2
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2000BH02      Phys.Lett. 476B, 285 (2000)

R.S.Bhalerao, N.G.Kelkar, B.Ram

Model for Polarized and Unpolarized Parton Density Functions in the Nucleon

NUCLEAR STRUCTURE 1n, 1H; calculated structure functions, parton density functions. Statistical model.

doi: 10.1016/S0370-2693(00)00158-1
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2000KE15      Int.J.Mod.Phys. E9, 431 (2000)

N.G.Kelkar, B.K.Jain

Hyperon-Nucleon Interactions in the pp → K+ Λp Reaction

NUCLEAR REACTIONS 1H(p, K+X), E=2.3 GeV; calculated Λp invariant mass; deduced hyperon-nucleon final-state interaction features. Meson exchange approach, comparisons with data.

doi: 10.1142/S0218301300000301
Citations: PlumX Metrics


1999PA15      Phys.Rev. C59, 2122 (1999)

A.Parreno, A.Ramos, N.G.Kelkar, C.Bennhold

Weak Strangeness Production Reaction pn → pΛ in a One-Boson-Exchange Model

NUCLEAR REACTIONS 1n(p, X), E at 900-1200 MeV/c; calculated hyperon production σ, σ(θ); deduced sensitivity to hyperon-nucleon interaction. One-meson exchange model.

doi: 10.1103/PhysRevC.59.2122
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1997KE01      Nucl.Phys. A612, 457 (1997)

N.G.Kelkar, B.K.Jain

Charge-Exchange np Scattering

NUCLEAR REACTIONS 1H(n, p), E at 0.605-105 GeV/c; analyzed σ(p(n), t)/σ(p(n), t=0). t-matrix approach.

doi: 10.1016/S0375-9474(96)00411-3
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1997KE02      Phys.Rev. C55, 1964 (1997)

N.G.Kelkar, E.Oset, P.Fernandez de Cordoba

Coherent Pion Production in Neutrino Nucleus Collision in the 1 GeV Region

NUCLEAR REACTIONS 71Ga, 37Cl, 16O(ν, X), E=1 GeV; calculated coherent pion production associated angle-integrated σ.

doi: 10.1103/PhysRevC.55.1964
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1996KE04      Phys.Rev. C53, 1851 (1996)

N.G.Kelkar, B.K.Jain

Quasielastic Scattering in the Inclusive (3He, t) Reaction

NUCLEAR REACTIONS 12C(3He, t), E=2 GeV; analyzed σ(θt, Et). DWBA based t-matrix.

doi: 10.1103/PhysRevC.53.1851
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1995KE13      Int.J.Mod.Phys. E4, 181 (1995)

N.G.Kelkar, B.K.Jain

Inclusive (3He, t) Reaction in Delta Excitation Region

NUCLEAR REACTIONS 12C(3He, tX), E=1.5-2.3 GeV; calculated σ(θ, E(t)) following Δ production. Other target nuclei studied, one-step reaction mechanism.

doi: 10.1142/S0218301395000080
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