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NSR database version of April 27, 2024.

Search: Author = S.G.Wahid

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2022BO04      Phys.Rev. C 105, 044327 (2022)

V.Bothe, S.K.Tandel, S.G.Wahid, P.C.Srivastava, B.Bhoy, P.Chowdhury, R.V.F.Janssens, F.G.Kondev, M.P.Carpenter, T.Lauritsen, D.Seweryniak, S.Zhu

Isomers in ²⁰³Tl and core excitations built on a five-nucleon-hole structure

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)²⁰³Tl, E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγγ-coin. ²⁰³Tl; deduced levels, J, π, multipolarities, T_1/2 of high-spin isomeric states, configurations. Half-lives determined by centroid-shift method for ns isomers and by variation with time of the cumulative intensity for υs isomers. Observed octupole core excitations built on a five-nucleon hole configuration. Comparison with shell-model calculations employing the KHH7B effective interaction. Gammasphere array with 100 detectors at ATLAS accelerator (ANL).

doi: 10.1103/PhysRevC.105.044327
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2022MA16      Phys.Rev. C 105, 034308 (2022)

Madhu, K.Yadav, A.Y.Deo, Pragati, P.C.Srivastava, S.K.Tandel, S.G.Wahid, S.Kumar, S.Muralithar, R.P.Singh, I.Bala, S.S.Bhattacharjee, R.Garg, S.Chakraborty, S.Rai, A.K.Jain

Evolution of nuclear structure through isomerism in ²¹⁶Fr

NUCLEAR REACTIONS ²⁰⁸Pb(¹¹B, 3n), E=54-62 MeV; measured Eγ, Iγ, γ(θ), γγ-coin. ²¹⁶Fr; deduced high-spin isomers, J, π, T_1/2 of isomeric states, γ-ray branching ratios, B(E1), B(M2), single-particle transition rates, configurations. Half-lives extracted using centroid-shift and decay-curve analyses. Systematics of the 11⁺ isomers properties in the ²¹⁶Fr, ²¹²At, ²¹⁸Ac. Comparison to the shell-model calculations. Beam from 15 UD Pelletron accelerator at Inter-University Accelerator Centre (IUAC). Detector system - Indian National Gamma Array (INGA) with 14 Compton suppressed clover HPGe.

doi: 10.1103/PhysRevC.105.034308
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2022SU19      Phys.Rev. C 106, 024316 (2022)

S.Suman, S.K.Tandel, S.G.Wahid, T.Manu, M.Hemalatha, B.Maheshwari, A.K.Jain, P.Chowdhury, R.V.F.Janssens, F.G.Kondev, M.P.Carpenter, T.Lauritsen, D.Seweryniak

Successive neutron alignments in the yrast, negative-parity band of oblate-deformed ¹⁹⁹Tl

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹⁹Tl, E=1450 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array with 100 Compton-suppressed HPGe detectors at the ATLAS-ANL accelerator facility. ¹⁹⁹Tl; deduced high-spin levels, J, π, alignments, signature slitting, B(M1)/B(E2), configurations, oblate deformation. ¹⁹⁹Tl; calculated total energy surfaces in (ϵ cosγ, ϵ sinγ) plane, neutron- and proton-quasiparticle levels for oblate deformation as function of angular frequency with principal axis cranking (PAC) and tilted axis cranking (TAC) models using the ultimate cranker (UC) code.

doi: 10.1103/PhysRevC.106.024316
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2022WA20      Phys.Lett. B 832, 137262 (2022)

S.G.Wahid, S.K.Tandel, S.Suman, P.C.Srivastava, A.Kumar, P.Chowdhury, F.G.Kondev, R.V.F.Janssens, M.P.Carpenter, T.Lauritsen, D.Seweryniak, S.Zhu

Emergence of an island of extreme nuclear isomerism at high excitation near ²⁰⁸Pb

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁷Pb, X)²⁰⁴Pb/²⁰⁵Bi/²⁰⁶Bi, E=1430 MeV; ¹⁹⁷Au(²⁰⁷Pb, X)²⁰⁴Pb/²⁰⁵Bi/²⁰⁶Bi, E=1450 MeV; measured Eγ, Iγ, γγ-coin, delayed γ spectra, T_1/2 of isomers by γγ(t) using pulsed beam from ATLAS-ANL facility, and Gammasphere array for γ detection. ²⁰⁴Pb, ^205,206Bi; deduced levels, isomers, J, π, configurations, nuclear isomerism from core-excited configurations in the vicinity of ²⁰⁸Pb. Comparison with shell-model predictions.

COMPILATION ⁹³Nb, ⁹³Mo, ¹⁴⁰Nd, ¹⁴⁴Pm, ¹⁴⁸Tb, ^212,213Fr, ²⁰⁴Pb, ^205,206Bi; compiled T_1/2 of isomers of >1 micro-sec half-life above 7-MeV excitations across the nuclear chart. ^{202,203,204,205}Tl, ^202,203,204Pb, ²⁰⁶Bi, ²¹³At, ^210,211,212Rn, ^209,211,212Fr; compiled B(E3) for isomer decays.

doi: 10.1016/j.physletb.2022.137262
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2022YA10      Phys.Rev. C 105, 034307 (2022)

K.Yadav, A.Y.Deo, Madhu, Pragati, P.C.Srivastava, S.K.Tandel, S.G.Wahid, S.Kumar, S.Muralithar, R.P.Singh, I.Bala, S.S.Bhattacharjee, R.Garg, S.Chakraborty, S.Rai, A.K.Jain

Level structure in the transitional nucleus ²¹⁵Fr

NUCLEAR REACTIONS ²⁰⁸Pb(¹¹B, 4n), E=54-62 MeV; measured Eγ, Iγ, γ(θ), γγ-coin, γγγ-coin. ²¹⁵Fr; deduced levels, high-spin states, J, π, δ, DCO-ratios, γ-ray multipolarities, polarization, T_1/2 of the excited states, configurations; calculated levels, J, π, B(E2), B(M1), B(E3), δ. Large scale shell model calculations with CD-Bonn NN potential. Discussed possible structure of yrast and near-yrast lines. Beam from 15 UD Pelletron accelerator at Inter-University Accelerator Centre (IUAC). Detector system - Indian National Gamma Array (INGA) with 14 Compton suppressed clover HPGe.

doi: 10.1103/PhysRevC.105.034307
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2021LA10      Int.J.Mod.Phys. E30, 2150062 (2021)

U.Lamani, P.Das, S.G.Wahid

Study of signature inversion in ^{123, 125}I using Particle Rotor Model calculations

NUCLEAR STRUCTURE ^123,125I; calculated energy levels, J, π, positive parity yrast bands, B(E2), B(M1); deduced signature inversion in positive parity yrast states.

doi: 10.1142/S0218301321500622
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2021SU02      Phys.Rev. C 103, 014319 (2021)

S.Suman, S.K.Tandel, A.Kumawat, S.G.Wahid, M.Hemalatha, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu

Nanosecond isomers and the evolution of collectivity in stable, even-A Hg isotopes

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X), E=1450 MeV; ¹⁹⁷Au(²⁰⁷Pb, X), E=1430 MeV; measured Eγ, Iγ, three- and higher fold γγ-coin, γγ(θ)(DCO), half-lives of nanosecond isomers by γγ(t) using pulsed beams from ATLAS-ANL accelerator, and Gammasphere array of 100 Compton-suppressed HPGe detectors. ^198,200,202Hg; deduced levels, J, π, multipolarities, B(E2), configurations, band crossings, and collectivity; calculated total energy surface plots, neutron and proton quasiparticle energy levels using the Ultimate Cranker code. Systematics of nanosecond isomers, half-lives and B(E2) in ^{192,194,196,198,200,202,204}Hg.

doi: 10.1103/PhysRevC.103.014319
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2020WA24      Phys.Rev. C 102, 024329 (2020)

S.G.Wahid, S.K.Tandel, S.Suman, M.Hemalatha, A.Patel, P.Roy, A.Y.Deo, Pragati, P.C.Srivastava, B.Bhoy, S.S.Bhattacharjee, R.P.Singh, S.Muralithar, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, S.Rai, A.Sharma

Metastable states from multinucleon excitations in ²⁰²Tl and ²⁰³Pb

NUCLEAR REACTIONS ¹⁹⁸Pt(⁷Li, 3n)²⁰²Tl, E=31-36 MeV; ¹⁹⁷Au(²⁰⁹Bi, X), E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization), half-lives of isomers by γ(t) and centroid-shift method using the INGA array at IUAC-New Delhi for the ²⁰²Tl experiment, and Gammasphere array at the ATLAS-ANL facility for ²⁰³Pb. ²⁰²Tl, ²⁰³Pb; deduced high-spin levels, isomers, J, π, multipolarities, B(E2), B(E3), configurations. Systematics of energies and B(Eλ) for isomers in ^202,203,204Tl and ^203,204,205Pb. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.102.024329
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2019WA22      Phys.Rev. C 100, 014328 (2019)

S.G.Wahid, S.K.Tandel, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, Q.B.Chen, J.Meng

Structure of odd-A Pt isotopes along the line of stability

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹³Pt/¹⁹⁵Pt/¹⁹⁷Pt, E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), half-lives of isomers by centroid-shift technique using the Gammasphere array at ATLAS-ANL facility. ^193,195,197Pt; deduced levels, J, π, multipolarities, alignments, configurations. Comparison with theoretical calculations.

NUCLEAR STRUCTURE ^193,195,197Pt; calculated levels, J, π, total energy surfaces, and B(E2); deduced shapes and band crossings. Tilted axis cranking covariant density functional theory (TAC-CDFT) using the Ultimate Cranker code. Comparison with experimental data. Systematics of positive-parity levels in A=189-196 even- and odd-A Pt isotopes.

doi: 10.1103/PhysRevC.100.014328
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2018PR03      Phys.Rev. C 97, 044309 (2018)

Pragati, A.Y.Deo, S.K.Tandel, S.S.Bhattacharjee, S.Chakraborty, S.Rai, S.G.Wahid, S.Kumar, S.Muralithar, R.P.Singh, I.Bala, R.Garg, A.K.Jain

Parity doublet structures in doubly-odd ²¹⁶Fr

NUCLEAR REACTIONS ²⁰⁸Pb(¹¹B, 3n), E=54-62 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization) using the INGA array at the 15-UD pelletron accelerator facility of IUAC, New Delhi. ²¹⁶Fr; deduced high-spin levels, J, π, parity doublet (simplex-partner) structures, B(E1)/B(E2) ratios, and enhancement of octupole correlations. Systematics of E1 energy splitting, and angular momentum versus rotational frequency plots for ²¹⁶Fr, ^219,223Th, ^218,220Ac, and B(E1)/B(E2) ratios for ²¹⁶Fr and ²¹⁸Ac.

doi: 10.1103/PhysRevC.97.044309
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2015TA25      Phys.Lett. B 750, 225 (2015)

S.K.Tandel, S.G.Wahid, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu

Isomers and oblate rotation in Pt isotopes: Delineating the limit for collectivity at high spins

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹⁴Pt/¹⁹⁶Pt/¹⁹⁸Pt, E=1450 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, high-spin B(E2). Cranking calculations using both standard Nilsson parameters in the Ultimate Cranker (UC) code.

doi: 10.1016/j.physletb.2015.09.019
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2015WA34      Phys.Rev. C 92, 054323 (2015)

S.G.Wahid, S.K.Tandel, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu

Rotation-aligned isomer and oblate collectivity in ¹⁹⁶Pt

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹⁶Pt, E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), level and isomer half-lives by γγ(t) using Gammasphere array at ATLS-ANL. ¹⁹⁶Pt; deduced high-spin levels, J, π, bands, multipolarity, B(E2), alignment plots, rotation-aligned isomeric state, configurations, shape evolution; calculated total energy surface plots. Comparison with cranked shell-model calculations. Systematics of level structures in ^{192,194,196,198}Pt, and those of alignments in N=118 isotones ¹⁹⁴Os, ¹⁹⁶Pt and ¹⁹⁸Hg.

doi: 10.1103/PhysRevC.92.054323
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