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NSR database version of April 11, 2024.

Search: Author = A.K.Kumar

Found 12 matches.

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2019MA89      Acta Phys.Pol. B50, 377 (2019)

I.Mazumdar, M.Dhibar, S.P.Weppner, G.Anil Kumar, A.K.R.Kumar, S.M.Patel, P.B.Chavan, C.D.Bagdia, L.C.Tribedi

Studies in Nuclear Structure and Big Bang Nucleosynthesis Using Proton Beams

NUCLEAR REACTIONS 12C(p, p'γ), E=8-22 MeV; measured Eγ, Iγ; deduced total σ, σ(θ); calculated total σ and s(θ) using coupled-channels model and single particle model taking into account resonances in 12C. 2H(p, γ), E=100, 175, 250 keV; measured Eγ, Iγ; deduced σ, astrophysical S-factor.

doi: 10.5506/aphyspolb.50.377
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2019MO25      Phys.Rev. C 100, 011602 (2019)

G.Mohanto, A.Parihari, P.C.Rout, S.De, E.T.Mirgule, B.Srinivasan, K.Mahata, S.P.Behera, M.Kushwaha, D.Sarkar, B.K.Nayak, A.Saxena, A.K.R.Kumar, A.Gandhi, Sangeeta, N.K.Deb, P.Arumugam

Collective enhancement in nuclear level density

NUCLEAR REACTIONS 181Ta, 197Au(11B, X)192Pt*/208Pb*, E=61.5, 63.0 MeV; measured Eα, Iα, neutron time of flight, E(n), I(n), and αn-coin from the compound nuclei using ΔE-E telescopes for charged particle detection and liquid scintillator array for neutron detection at the BARC-TIFR LINAC-Pelletron facility. 188Os, 204Pb; deduced inverse level density parameters as a function of excitation energy, and energy-dependent collective enhancement factor obtained from simultaneous fitting of the neutron spectra. 169Tm, 181Ta(α, X), E=26-40 MeV; analyzed previous experimental yields with model calculations. 187Os, 203Pb; calculated temperature dependent free energy surfaces. Comparison with statistical model calculations.

doi: 10.1103/PhysRevC.100.011602
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2018DE02      Phys.Rev. C 97, 014317 (2018)

B.Dey, C.Ghosh, D.Pandit, A.K.R.Kumar, S.Pal, V.Nanal, R.G.Pillay, P.Arumugam, S.De, G.Gupta, H.Krishnamoorthy, E.T.Mirgule, S.Pal, P.C.Rout

Study of the Jacobi shape transition in A ≈ 30 nuclei

NUCLEAR REACTIONS 12C(19F, X)28Si*, E=127 MeV; 12C(16O, X)31P*, E=125 MeV; measured fold-gated high-energy Eγ, Iγ using an array of seven closely-packed hexagonal BaF2 detectors, and a 14-element BGO multiplicity filter at Pelletron Linac Facility (PLF), Mumbai. 28Si, 31P; deduced average angular momentum, energy, width and strength of giant dipole resonances (GDR), Jacobi shape transition in 31P; calculated free energy surfaces. Comparison with thermal shape fluctuation model (TSFM).

doi: 10.1103/PhysRevC.97.014317
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2017GH06      Phys.Rev. C 96, 014309 (2017)

C.Ghosh, A.K.R.Kumar, B.Dey, V.Nanal, R.G.Pillay, P.Arumugam, K.V.Anoop, N.Dokania, A.Garai, G.Gupta, E.T.Mirgule, G.Mishra, D.Mondal, S.Pal, M.S.Pose, P.C.Rout

Giant dipole resonance studies in Ba isotopes at E/A ≈ 5 MeV

NUCLEAR REACTIONS 112Sn(12C, X)124Ba*, E=64 MeV; 124Sn(12C, X)136Ba*, E=52 MeV/nucleon; measured Eγ, Iγ, γγ-coin, multiplicity, giant dipole resonance (GDR) strength functions at TIFR-Mumbai Pelletron Linac Facility. 124,136Ba; deduced GDR parameters of centroids, widths and nuclear deformation parameter β using simulated Monte Carlo statistical model analysis; calculated the free energy surfaces (FESs) at different temperatures and angular momenta. Comparison with thermal shape fluctuation model (TSFM) calculations.

doi: 10.1103/PhysRevC.96.014309
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2017KU16      Phys.Rev. C 96, 024322 (2017)

A.K.R.Kumar, P.Arumugam, N.Dinh Dang, I.Mazumdar

Giant dipole resonance and shape transitions in hot and rotating 88Mo

NUCLEAR REACTIONS 40Ca(48Ti, X)88Mo*/86Zr/84Zr/80Sr/76Kr/74Se/70Ge/68Ge, E=300, 600 MeV; calculated giant-dipole resonance (GDR) cross sections within the thermal shape fluctuation model (TSFM) for different daughter nuclei formed at different temperatures and angular momenta. Comparison of experimental GDR cross sections and widths for 88Mo with the TSFM calculations. 88Mo; calculated free energy surfaces (FES) in (β2, γ) plane as functions of temperature and angular momentum.

doi: 10.1103/PhysRevC.96.024322
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2016GH09      Phys.Rev. C 94, 014318 (2016)

C.Ghosh, G.Mishra, A.K.R.Kumar, N.Dokania, V.Nanal, R.G.Pillay, Suresh Kumar, P.C.Rout, S.Joshi, P.Arumugam

Temperature dependence of the giant dipole resonance width in 152Gd

NUCLEAR REACTIONS 124Sn(28Si, X)152Gd*, E=135 MeV; measured Eγ, Iγ, γγ-coin at TIFR-BARC Pelletron Linac facility; deduced GDR centroids, widths, average angular momentum for oblate and prolate deformations. Comparison with thermal shape fluctuation model (TSFM) calculations with and without including thermal fluctuations.

doi: 10.1103/PhysRevC.94.014318
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2016KU24      Phys.Rev. C 94, 049802 (2016)

A.K.R.Kumar, P.Arumugam

Reply to "Comment on 'Thermal shape fluctuation model study of the giant dipole resonance in 152Gd' "

doi: 10.1103/PhysRevC.94.049802
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2015KU11      Phys.Rev. C 91, 044305 (2015)

A.K.R.Kumar, P.Arumugam, N.Dinh Dang

Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei

NUCLEAR STRUCTURE 97Tc, 120Sn, 179Au, 208Pb; calculated average pairing gap and average quadrupole deformation parameter as function of temperature, probability distribution for gap parameter of protons and neutrons, free energy surface contours in (β, γ) plane, giant-dipole resonance (GDR) strength functions. Thermal shape fluctuation model (TSFM) extended to include the fluctuations in the pairing field. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.044305
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2015KU27      Phys.Rev. C 92, 044314 (2015)

A.K.R.Kumar, P.Arumugam

Thermal shape fluctuation model study of the giant dipole resonance in 152Gd

NUCLEAR STRUCTURE 152Gd; analyzed experimental σ, GDR widths, free energy surfaces (FES) in (β2, γ) plane as functions of temperature and angular momentum in 124Sn(28Si, X)152Gd*, E=149, 185 MeV reaction; calculated average deformation and probability distribution of 152Gd shapes. Discussed occurrence of γ softness in the free energy surfaces of 152Gd and its role on GDR. Thermal shape fluctuation model (TSFM) built on the microscopic-macroscopic calculations of the free energies with a macroscopic approach for GDR.

doi: 10.1103/PhysRevC.92.044314
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2014KU24      Phys.Rev. C 90, 044308 (2014)

A.K.R.Kumar, P.Arumugam, N.Dinh Dang

Pairing effect in the thermal shape-fluctuation model on the width of the giant dipole resonance

NUCLEAR STRUCTURE 97Tc, 120Sn, 208Pb; calculated neutron and proton pairing gaps, widths of giant dipole resonances (GDR), free energy surface contours, shell effects and fluctuations of the pairing field dependence on temperature using the thermal shape-fluctuation model (TSFM). Comparison with experimental results.

doi: 10.1103/PhysRevC.90.044308
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2014MU11      J.Phys.(London) G41, 115103 (2014)

I.Mukul, A.Roy, P.Sugathan, J.Gehlot, G.Mohanto, S.Nath, N.Madhavan, R.Dubey, T.Banerjee, N.Saneesh, I.Mazumdar, D.A.Gothe, A.K.R.Kumar, P.Arumugam, M.Kaur

Decoupling the effect of temperature on GDR widths in excited compound nucleus 144Sm

NUCLEAR REACTIONS 116Cd(28Si, X)144Sm, E=170, 196.5 MeV; measured reaction products, Eγ, Iγ; deduced fusion σ, giant dipole resonance parameters. Thermal shape fluctuation model calculations.

doi: 10.1088/0954-3899/41/11/115103
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2013IS10      Phys.Rev. C 88, 024312 (2013)

Ish Mukul, A.Roy, P.Sugathan, J.Gehlot, G.Mohanto, N.Madhavan, S.Nath, R.Dubey, I.Mazumdar, D.A.Gothe, M.Kaur, A.K.R.Kumar, P.Arumugam

Effect of angular momentum on giant dipole resonance observables in the 28Si+116Cd reaction

NUCLEAR REACTIONS 116Cd(28Si, X)144Sm*, E=125, 140 MeV; measured Eγ, Iγ, γγ-coin, time-of-flight, fold distribution using 4π spin spectrometer at Pelletron facility of IUAC; deduced γ-ray multiplicity, angular momentum distribution, average angular momentum, GDR energies, centroids, widths, deformation parameter, and strength distribution. Statistical model analysis using CASCADE computer code. Comparison with thermal shape fluctuation model (TSFM)calculations. 144Sm; calculated potential energy surface contours at different angular momenta and temperatures in (β, γ) plane.

doi: 10.1103/PhysRevC.88.024312
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