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NSR database version of April 11, 2024.

Search: Author = K.Kar

Found 32 matches.

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2021BH08      Eur.Phys.J. Special Topics 230, 505 (2021)

P.Bhattacharjee, K.Kar

Supernova neutrino detection through neutron emission by nuclei

NUCLEAR REACTIONS 56Fe(ν, e-)56Co, E<60 MeV; 132Xe(ν, e-)132Cs, E<10 MeV; calculated σ, one-, two- and three-neutron emission probabilities, neutron yields.

doi: 10.1140/epjs/s11734-021-00002-6
Citations: PlumX Metrics


2020KA65      Pramana 94, 100 (2020)

K.Kar, S.Sarkar

The linear term in the isobaric-mass-multiplet equation for fp-shell nuclei in the framework of spectral distribution theory

doi: 10.1007/s12043-020-01957-2
Citations: PlumX Metrics


2015KA10      J.Phys.(London) G42, 055110 (2015)

K.Kar, S.Sarkar

Study of isospin nonconservation in the framework of spectral distribution theory

doi: 10.1088/0954-3899/42/5/055110
Citations: PlumX Metrics


2013KA02      J.Phys.(London) G40, 015105 (2013)

K.Kar

Statistical spectroscopy for neutron-rich sd-shell nuclei

NUCLEAR STRUCTURE 21,22,23O, 20,21,22,23,24,25,26,27,28F, 20,21,22,23,24,25,26,27,28,29Ne, 22,23,24,25,26,27,28,29,30,31Na, 24,25,26,27,28,29,30,31,32Mg, 26,27,28,29,30,31,32,33Al, 28,29,30,31,32,33,34Si, 30,31,32,33,34,35P, 32,33,34,35S, 34,35,36Cl, 36Ar; calculated binding energies, E2 strength, total orbit occupancy. Distribution theory, comparison with available data.

doi: 10.1088/0954-3899/40/1/015105
Citations: PlumX Metrics


2007MA24      Pramana 68, 423 (2007)

D.Majumdar, K.Kar

Beta decay rates of nuclei with 65 < A < 75 for pre-supernova and supernova evolution

RADIOACTIVITY 66,68,69Co, 67,68,69,71Ni, 68,72,74Cu(β-); calculated T1/2, astrophysical decay rates.


2006KA46      Pramana 67, 363 (2006)

K.Kar, S.Chakravarti, V.R.Manfredi

Beta decay rates for nuclei with 115 < A < 140 for r-process nucleosynthesis

RADIOACTIVITY 116,117Rh, 118,120Ag, 125Cd, 128,130,131,132In, 133Sn, 132,134,136Sb, 136,137,138I, 137,138Te(β-); calculated T1/2, β-decay rates. Astrophysical implications discussed.

doi: 10.1007/s12043-006-0081-2
Citations: PlumX Metrics


2004GO30      Phys.Rev. C 69, 057302 (2004)

J.M.G.Gomez, K.Kar, V.K.B.Kota, R.A.Molina, J.Retamosa

Number of principal components and localization length in E2 and M1 transition strengths in 46V

NUCLEAR STRUCTURE 46V; calculated E2 and M1 transition strengths, number of principal components. Embedded Gaussian orthogonal random matrix ensemble.

doi: 10.1103/PhysRevC.69.057302
Citations: PlumX Metrics


2003GO16      Phys.Lett. B 567, 251 (2003)

J.M.G.Gomez, K.Kar, V.K.B.Kota, R.A.Molina, J.Retamosa

Localization in 2p1f nuclear shell-model wavefunctions

NUCLEAR STRUCTURE 48,50,52Ca, 46,48,50Sc, 46Ti; calculated localization lengths for shell-model wavefunctions; deduced isospin dependence in onset of nuclear chaos. Embedded Gaussian orthogonal ensemble.

doi: 10.1016/j.physletb.2003.06.041
Citations: PlumX Metrics


2001GO37      Phys.Rev. C64, 034305 (2001)

J.M.G.Gomez, K.Kar, V.K.B.Kota, J.Retamosa, R.Sahu

Transition Strengths and Quantum Chaos in Large Shell-Model Spaces

NUCLEAR STRUCTURE 36Ne, 36Na, 36Mg, 46Ti, 48,52Sc; calculated E2, M1, and Gamow-Teller transition strength sums vs excitation energy. Shell model, comparison with embedded Gaussian orthogonal ensemble predictions.

doi: 10.1103/PhysRevC.64.034305
Citations: PlumX Metrics


2000GO14      Phys.Lett. 480B, 245 (2000)

J.M.G.Gomez, K.Kar, V.R.Manfredi, R.A.Molina, J.Retamosa

Statistical Theory versus Shell Model in a Large pf Configuration Space

NUCLEAR STRUCTURE 46V, 50Sc; calculated transition strength distributions. Comparison of shell model, statistical model.

doi: 10.1016/S0370-2693(00)00414-7
Citations: PlumX Metrics


1999KO48      Phys.Rev. C60, 051306 (1999)

V.K.B.Kota, R.Sahu, K.Kar, J.M.G.Gomez, J.Retamosa

Transition Strength Sums and Quantum Chaos

doi: 10.1103/PhysRevC.60.051306
Citations: PlumX Metrics


1998CH19      Phys.Rev. C58, 597 (1998)

S.Choubey, K.Kar, J.M.G.Gomez, V.R.Manfredi

Spectral Distribution Studies with a Modified Kuo-Brown Interaction in the Upper Half of the fp Shell

NUCLEAR STRUCTURE Z=26-36; calculated binding energies, GT sum rule strengths. Spectral distribution method, modified Kuo-Brown interaction.

doi: 10.1103/PhysRevC.58.597
Citations: PlumX Metrics


1998KA34      J.Phys.(London) G24, 1641 (1998)

K.Kar, S.Chakravarti, A.Ray, S.Sarkar

Half-Lives and Presupernova Weak Interaction Rates for Nuclei Away from the Stability Line

RADIOACTIVITY 68,69Co, 68Fe, 69,71,72Ni, 71,72,73Cu, 58,59Cr, 63Mn(β-); calculated T1/2.

doi: 10.1088/0954-3899/24/8/045
Citations: PlumX Metrics


1998MA76      J.Phys.(London) G24, 2103 (1998)

D.Majumdar, K.Kar, A.Ansari

Giant Dipole Resonance in Spectral Averaging Theory and Analysis of Experimental Data for the 76Se Nucleus

NUCLEAR STRUCTURE 76Se; calculated GDR photon adsorption σ. Spectral averaging theory. Comparison with data.

doi: 10.1088/0954-3899/24/11/011
Citations: PlumX Metrics


1997KA13      Phys.Rev. C55, 1260 (1997)

K.Kar, S.Sarkar, J.M.G.Gomez, V.R.Manfredi, L.Salasnich

Spectral Distribution Studies of fp Shell Nuclei with a Modified Kuo-Brown Interaction

NUCLEAR STRUCTURE 48Sc, 46Ti; calculated levels. A=46-56; Z=20-28; calculated binding energy. Spectral distribution method, Kuo-Brown interaction.

doi: 10.1103/PhysRevC.55.1260
Citations: PlumX Metrics


1997KA73      Mod.Phys.Lett. A 12, 2279 (1997)

K.Kar, S.Sarkar, S.Goswami, A.Raychaudhuri

Excited States of 71Ge Above the Neutron Emission Threshold and Solar Neutrino Capture Rates for Ga Detectors

NUCLEAR STRUCTURE 71Ge; calculated Gamow-Teller strengths; deduced Ga solar neutrino detector ν capture rates, importance of states beyond neutron threshold.

doi: 10.1142/S0217732397002351
Citations: PlumX Metrics


1997MA40      J.Phys.(London) G27, L41 (1997)

D.Majumdar, K.Kar, A.Ansari

Giant Dipole Resonance in Spectral Averaging Theory

NUCLEAR REACTIONS, ICPND 64Zn(γ, X), E ≤ 45 MeV; calculated GDR absorption σ(E). Spectral averaging theory.

doi: 10.1088/0954-3899/23/7/001
Citations: PlumX Metrics


1996SA30      Phys.Lett. 387B, 227 (1996)

S.Sarkar, K.Kar

Gamow-Teller Strengths in f(p) Shell

NUCLEAR STRUCTURE 45Sc, 51V, 55Mn, 59Co, 48Ti, 56,54Fe, 58,60,62,64Ni, 70Ge; calculated Gamow-Teller transition strength. Spectral distribution theory, simple parametrization based.

doi: 10.1016/0370-2693(96)00966-5
Citations: PlumX Metrics


1995SA20      J.Phys.(London) G21, 411 (1995)

S.Sarkar, K.Kar

Effect of Inclusion of 1g Orbits on the Gamow-Teller Strengths for the Capture Rates of Solar Neutrinos in Ga Detectors

NUCLEAR REACTIONS 71Ga(p, n), E=medium; calculated Gamow-Teller transition strength; deduced Ga detector ν capture rates. Extended shell model.

doi: 10.1088/0954-3899/21/3/015
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1992CH43      Z.Phys. A344, 149 (1992)

J.M.Chatterjee, S.Basu, R.K.Chattopadhyay, K.Kar, D.Banik, R.P.Sharma, S.K.Pardhasaradhi

High Spin Isomer in 151Sm

NUCLEAR REACTIONS 150Nd(α, 3nγ), E=35 MeV; measured γγ-coin. 151Sm deduced isomer, other levels T1/2.

doi: 10.1007/BF01291698
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1991KA25      Phys.Lett. 261B, 217 (1991)

K.Kar, S.Sarkar, A.Ray

Beta Decay Rates of fp Shell Nuclei in Advanced Evolutionary Stages of Presupernova Stars

RADIOACTIVITY 68Cu, 67Ni, 64,63,62Co, 61Fe; calculated β-decay T1/2, decay rate. Gamow-Teller sum rule strength input.

doi: 10.1016/0370-2693(91)90317-J
Citations: PlumX Metrics


1989KA32      Pramana 32, 497 (1989)

K.Kar, S.Sarkar

Spectral Distribution Theory - Some Recent Applications

NUCLEAR STRUCTURE 60,64,54,56Fe, 58,60Ni; calculated average β-strength sum. 20Ne, 24Mg, 28Si; calculated Gamow-Teller, isovector M1 transition strength sum. Spectral distribution methods.

doi: 10.1007/BF02845980
Citations: PlumX Metrics


1989SA26      Phys.Rev. C40, 1826 (1989)

S.Sarkar, K.Kar

Gamow-Teller and M1 Strength Sums for sd Shell Nuclei by Spectral Distribution Methods

NUCLEAR STRUCTURE 20Ne, 24Mg, 28Si, 32S; calculated Gamow-Teller, M1 transition strength sums for ground, excited states. Spectral distribution method.

doi: 10.1103/PhysRevC.40.1826
Citations: PlumX Metrics


1988CH39      Phys.Rev. C38, 2435 (1988)

R.K.Chattopadhyay, B.Sethi, J.M.Chatterjee, K.Kar, P.Banerjee

Unfavored Allowed Beta Decay of the (11/2)- Isomer of 141Nd

RADIOACTIVITY 141mNd(β+) [from 142Nd(n, 2n), E=14 MeV]; measured Eγ, Iγ; deduced log ft, β-feeding, isomer T1/2. Natural target. 141Pr deduced levels, transitions, branching ratios.

NUCLEAR REACTIONS 139La(α, 2nγ), E=30 MeV; measured Eγ, Iγ. 141Pr deduced levels, branching ratios. Natural target, hyperpure Ge detectors.

doi: 10.1103/PhysRevC.38.2435
Citations: PlumX Metrics


1988PA13      J.Phys.(London) G14, 1083 (1988)

D.Pal, S.Chattopadhyay, K.Kar

Non-Markovian Features of Deeply Inelastic Collisions

NUCLEAR REACTIONS 166Er(86Kr, X), E=703 MeV; 209Bi(136Xe, X), E=1130 MeV; calculated charge transfer variances, drift. Deep inelastic collisions, non-Markovian features.

doi: 10.1088/0305-4616/14/8/011
Citations: PlumX Metrics


1988SA17      J.Phys.(London) G14, L123 (1988)

S.Sarkar, K.Kar

Gamow-Teller Strength Sums for Nuclei in the fp Shell

NUCLEAR STRUCTURE 54,56,60,64Fe, 58,60Ni; calculated Gamow-Teller transition strength sums.

doi: 10.1088/0305-4616/14/6/001
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1987SA48      Phys.Rev. C36, 2700 (1987)

S.Sarkar, K.Kar, V.K.B.Kota

Spectral Distribution Calculations using Wildenthal's Universal sd Interaction

NUCLEAR STRUCTURE A=20-36; calculated binding energies. A=21-35; calculated ground state s-, d-orbital occupancies. 28Si; calculated levels. Spectral distribution method.

doi: 10.1103/PhysRevC.36.2700
Citations: PlumX Metrics


1983KA12      J.Phys.(London) G9, 735 (1983)

K.Kar

M1 Strengths and Sum Rules in the Wigner Supermultiplet Scheme

NUCLEAR STRUCTURE 20,21Ne, 22,23Na, 26Mg; calculated isoscalar, isovector B(M1) strengths. 22Na; calculated nonenergy weighted sum rule strength. SU(4) model.

doi: 10.1088/0305-4616/9/7/009
Citations: PlumX Metrics


1983KA32      Phys.Rev. C28, 2446 (1983)

K.Kar

Gamow-Teller Decay Strength in the Wigner Supermultiplet Scheme

NUCLEAR STRUCTURE 20F, 21,22Mg, 23Ne, 24Al, 33Ar, 35S, 36K; calculated Gamow-Teller transition log ft. SU(4) spin-isospin spaces, spectral distribution method.

doi: 10.1103/PhysRevC.28.2446
Citations: PlumX Metrics


1981CO04      Nucl.Phys. A356, 1 (1981)

C.R.Countee, J.P.Draayer, T.R.Halemane, K.Kar

Shell-Model Studies of Statistical Approximations to Model Interactions

NUCLEAR STRUCTURE 20,22Ne; calculated levels, B(E2), eigenstate overlaps. Shell model, statistical approximation.

doi: 10.1016/0375-9474(81)90113-5
Citations: PlumX Metrics


1981KA06      Phys.Lett. 98B, 393 (1981)

K.Kar, S.S.M.Wong

A Shell Model Study of the Gamow-Teller Giant Resonance

NUCLEAR STRUCTURE 21Mg; calculated β+-decay, Gamow-Teller strength function. SU(4) symmetry, statistical spectroscopy methods.

doi: 10.1016/0370-2693(81)90438-X
Citations: PlumX Metrics


1981KA32      Nucl.Phys. A368, 285 (1981)

K.Kar

A Statistical Method for the Study of Beta Decay Giant Resonances

RADIOACTIVITY 16O, 20,21,22F, 23,25Ne, 25,26,28Na; calculated β-decay T1/2; 21Mg, 23Ne; calculated log ft. Statistical giant resonance decay.

doi: 10.1016/0375-9474(81)90686-2
Citations: PlumX Metrics


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