NSR Query Results
Output year order : Descending NSR database version of April 26, 2024. Search: Author = P.Alexa Found 35 matches. 2024AB02 Nucl.Phys. A1044, 122841 (2024) Microscopic study of ground-state binding energies in Z=52-70 neutron-rich nuclei NUCLEAR STRUCTURE 132,134,136,138,140,142,144Te, 134,136,138,140,142,144,146,148,150Xe, 136,138,140,142,144,146,148,150,152,154Ba, 138,140,142,144,146,148,150,152,154,156,158Ce, 140,142,144,146,148,150,152,154,156,158,160,162Nd, 142,144,146,148,150,152,154,156,158,160,162,164,166,168Sm, 144,146,148,150,152,154,156,158,160,162,164,166,168,170,172Gd, 146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176Dy, 148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180Er, 152,154,156,158,160,162,164,166,168,170,172,174,176,178,180Yb; calculated binding energies and quadrupole deformations within the mean-field approach based on density functional theory. Comparison with available dat.
doi: 10.1016/j.nuclphysa.2024.122841
2023KO09 Ann.Nucl.Energy 191, 109904 (2023) M.Kostal, T.Czakoj, P.Alexa, J.Simon, M.Zmeskal, M.Schulc, A.Krechlerova, T.Peltan, F.Mravec, F.Cvachovec, V.Rypar, R.Uhlar, O.Harkut, Z.Matej Measurement of dosimetrical cross sections with 14.05 MeV neutrons from compact neutron generator NUCLEAR REACTIONS Ti(n, X)47Sc, 58Ni, 46,48Ti, 56Fe, 24Mg, 59Co(n, p), 93Nb, 89Y, 197Au, 90Zr, 59Co, 55Mn, 169Tm(n, 2n), 59Co(n, α), 58Ni(n, X)57Co, E=14.05 MeV; measured reaction products; deduced σ, a large set of reaction rates with the low-emission neutron generator. Comparison with IRDFF-II, ENDF/B-VIII.0, JEFF-3.3, JENDL-4, CENDL-3.2 libraries.
doi: 10.1016/j.anucene.2023.109904
2022AL19 Phys.Rev. C 106, 054304 (2022) P.Alexa, M.Abolghasem, G.Thiamova, D.Bonatsos, T.R.Rodriguez, P.-G.Reinhard Macroscopic and microscopic description of phase transition in cerium isotopes NUCLEAR STRUCTURE 146,148Ce, 150Ce; calculated levels, J, π, B(E2), ground state deformation. 142,144,146,148,150,152Ce; calculated potential energy surface, potential energy curves. Calculations in the framework of the macroscopic algebraic collective model (ACM) and two microscopic approaches - Skyrme-Hartree-Fock+Bardeen-Cooper-Schrieffer (BCS) and the symmetry conserving configuration mixing method (SCCM) with Gogny energy density functionals. Systematics of the experimental energy ratios for 0+, 2+, 4+, 6+ levels of Ce, Nd, Sm, Gd and Dy isotopes. Comparison with experimental data.
doi: 10.1103/PhysRevC.106.054304
2021KO34 Phys.Lett. B 820, 136593 (2021) A.Kovalik, A.Kh.Inoyatov, L.L.Perevoshchikov, M.Rysavy, D.V.Filosofov, P.Alexa, J.Kvasil The first experimental evidence for the (M1 + E2) mixed character of the 9.2 keV transition in 227Th RADIOACTIVITY 227Ac(β-); measured decay products, Eβ, Iβ; deduced internal conversion coefficients, spectroscopic admixture parameter. Comparison with theoretical calculations.
doi: 10.1016/j.physletb.2021.136593
2020KN04 Phys.Rev. C 102, 054322 (2020) L.Knafla, P.Alexa, U.Koster, G.Thiamova, J.-M.Regis, J.Jolie, A.Blanc, A.M.Bruce, A.Esmaylzadeh, L.M.Fraile, G.de France, G.Hafner, S.Ilieva, M.Jentschel, V.Karayonchev, W.Korten, T.Kroll, S.Lalkovski, S.Leoni, H.Mach, N.Marginean, P.Mutti, G.Pascovici, V.Paziy, Zs.Podolyak, P.H.Regan, O.J.Roberts, N.Saed-Samii, G.S.Simpson, J.F.Smith, T.Soldner, C.Townsley, C.A.Ur, W.Urban, A.Vancraeyenest, N.Warr Lifetime measurements in the odd-A nucleus 177Hf RADIOACTIVITY 177mLu(β-)[from thermal neutron activation of Lu(NO3)3 at the FRM2 reactor in Garching]; measured Eγ, Iγ, γγ-coin, half-lives of levels in 177Hf by γγ(t) and generalized-centroid-difference (GCD) method using EXILL-FATIMA array of eight HPGe-Clover detectors and 16 fast-timing LaBr3(Ce) detectors at ILL-Grenoble. 177Hf; deduced levels, J, π, B(M1), B(E2), B(E1), configurations. Comparison to particle-rotor-model (PRM), and quasiparticle-phonon-model (QPM) calculations with multipole-multipole interactions. 176Hf; calculated microscopic structure of the lowest 2-qp vibrational states.
doi: 10.1103/PhysRevC.102.054322
2020KO03 Phys.Rev. C 101, 014303 (2020) P.Koseoglou, V.Werner, N.Pietralla, S.Ilieva, T.Niksic, D.Vretenar, P.Alexa, M.Thurauf, C.Bernards, A.Blanc, A.M.Bruce, R.B.Cakirli, N.Cooper, L.M.Fraile, G.de France, M.Jentschel, J.Jolie, U.Koster, W.Korten, T.Kroll, S.Lalkovski, H.Mach, N.Marginean, P.Mutti, Z.Patel, V.Paziy, Zs.Podolyak, P.H.Regan, J.-M.Regis, O.J.Roberts, N.Saed-Samii, G.S.Simpson, T.Soldner, C.A.Ur, W.Urban, D.Wilmsen, E.Wilson Low-Z boundary of the N=88-0 shape phase transition: 148Ce near the critical point NUCLEAR REACTIONS 235U(n, Fγ), E=cold neutrons from PF1B, ILL-Grenoble facility; measured Eγ, γγ-coin, half-lives of the first 2+ and 4+ levels in 148Ce by fast-timing technique using the EXILL-FATIMA array of eight EXOGAM clovers and 16 LaBr3(Ce) scintillators. 148Ce; deduced levels, B(E2) for the first 2+ 4+ states. Comparison with predictions of vibrator, rigid rotor, X(5) and X(5)-β8 models, and with previous experimental results. Systematics of E(first 4+)/E(first 2+) and energies of the yrast states for N=90 isotones 146Ba, 148Ce, 150Nd, 152Sm, 154Gd, 156Dy. NUCLEAR STRUCTURE 144,146,148Ce, 146,148,150Nd, 148,150,152,154Sm; calculated quantum shape phase transition (QSPT) lines in the IBM symmetry triangle using IBM-1 model. 148Ce; calculated self-consistent triaxial quadrupole constrained energy surfaces and probability distributions in in the β-γ plane using Axial Skyrme-Hartree-Fock-Bogoliubov model.
doi: 10.1103/PhysRevC.101.014303
2019AB13 Acta Phys.Pol. B50, 555 (2019) M.Abolghasem, P.Alexa, A.Repko, P.-G.Reinhard Evolution of Nuclear Shapes and Structure in Tellurium, Xenon, Barium and Cerium Isotopes NUCLEAR STRUCTURE 134,136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178Te, 136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180Xe, 138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,182Ba, 140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,182,184Ce; calculated quadrupole β2, octupole β3 and hexadecapole β4 deformation parameters, level energies. Hartree-Fock+BCS and Skyrme QRPA calculations. Comparison to experimental results.
doi: 10.5506/aphyspolb.50.555
2018AL14 Phys.Rev. C 97, 034327 (2018) P.Alexa, M.Ramdhane, G.Thiamova, G.S.Simpson, H.R.Faust, J.Genevey, U.Koster, T.Materna, R.Orlandi, J.A.Pinston, A.Scherillo, Z.Hons Quasiparticle phonon model description of low-energy states in 152Pr RADIOACTIVITY 152Pr(IT)[from 241Am(n, F), E=thermal, followed by mass separation of A=152 fission fragments using Lohengrin separator at ILL-Grenoble]; measured Eγ, Iγ, ce, x rays, (A=152 ions)γ-coin, (A=152 ions)ce-coin, half-life of the isomer by (A=152 ions)γ(t), conversion coefficients. 152Pr; deduced levels, J, π, multipolarities, configurations. Comparison with quasiparticle phonon model (QPM), combined with the particle-rotor model to include octupole correlations and Coriolis mixing. 152Nd; calculated energies of the first two 3- levels in connection with β- decay of 152Pr g.s. to 152Nd.
doi: 10.1103/PhysRevC.97.034327
2018TH06 Phys.Rev. C 98, 064304 (2018) G.Thiamova, Y.Grachev, M.Abolghasem, P.Alexa, P.-G.Reinhard, T.R.RodrIguez, G.S.Simpson Macroscopic and microscopic description of low-energy collective states in 86, 88Se NUCLEAR STRUCTURE 86,88Se; calculated levels, J, π, B(E2), potential energy curves (PEC), collective wave function contours in (β2, γ) plane using Algebraic collective model (ACM) with five-dimensional collective Hamiltonian, and symmetry conserving configuration mixing (SCCM) method with Gogny energy density functionals (EDF). Comparison with experimental data. 74,76,78,80,82,84,86,88,90,92,94,96,98,100Se; calculated energies of the first 2+ states, triaxiality, deformation β2, oblate and prolate potential energy curve minima using Skyrme-Hartree-Fock model (SHF) with two parametrizations SVbas and sym34. 82,84,86Ge, 84,86,88Se, 86,88,90,92,94Kr, 88,90,92,94,96Sr; compiled systematics of experimental energies of the first 2+ states, E(first 4+)/E(first 2+) and E(second 2+)/E(first 2+) ratios.
doi: 10.1103/PhysRevC.98.064304
2016RA07 Acta Phys.Pol. B47, 911 (2016) M.Ramdhane, G.S.Simpson, F.Drouet, T.Malkiewicz, A.Vancraeyenest, G.Gey, P.Alexa, G.Thiamova, G.Kessedjian, C.Sage, T.Grahn, P.T.Greenlees, K.Hauschild, A.Herzan, U.Jakobsson, P.Jones, R.Julin, S.Juutinen, S.Ketelhut, A.Lopez-Martens, P.Nieminen, P.Peura, P.Rahkila, S.Rinta-Antila, P.Ruotsalainen, M.Sandzelius, J.Saren, C.Scholey, J.Sorri, J.Uusitalo Study of Intermediate-spin States of 98Y NUCLEAR REACTIONS 238U(p, X)98Y, E=25 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, rotational band. Comparison with GICM amd QPRM calculations.
doi: 10.5506/APhysPolB.47.911
2015LE20 Phys.Rev. C 92, 064319 (2015) A.I.Levon, P.Alexa, G.Graw, R.Hertenberger, S.Pascu, P.G.Thirolf, H.-F.Wirth Spectroscopy of 232U in the (p, t) reaction: More information on 0+ excitations NUCLEAR REACTIONS 234U(p, t), E=25 MeV; measured E(t), I(t), σ(θ) using Q3D magnetic spectrograph facility at the Munich Tandem accelerator. 232U; deduced levels, several 0+ states, J, π, bands, moment of inertia plots, B(E1)/B(E1) and B(E1)/B(E2) ratios. CHUCK3 analysis and DWBA calculations. Comparison with evaluated data in Nuclear Data Sheets. Comparison with interacting boson model (IBM-spdf) and quasiparticle-phonon model (QPM) calculations. Systematics of energies, (p, t) strengths and density distribution of excited 0+ states in 232U, 228,230Th and 154Gd.
doi: 10.1103/PhysRevC.92.064319
2013LE21 Phys.Rev. C 88, 014310 (2013) A.I.Levon, G.Graw, R.Hertenberger, S.Pascu, P.G.Thirolf, H.-F.Wirth, P.Alexa 0+ states and collective bands in 228Th studied by the (p, t) reaction NUCLEAR REACTIONS 230Th(p, t), E=25 MeV; measured triton spectra, σ(θ) using Q3D magnetic spectrograph at Munich tandem accelerator facility. 228Th; deduced levels, J, π, collective bands, moments of inertia, B(E1)/B(E2), nature of 0+ states. DWBA fit procedure. Coupled-channel analysis of σ(θ) data using CHUCK3 computer code. Comparison with previous experimental data, and with interacting boson model and quasiparticle-phonon model calculations. NUCLEAR STRUCTURE 228Th; calculated levels, J, π, bands, B(E1)/B(E2), configurations using interacting boson model (IBM), and quasiparticle-phonon model (QPM).
doi: 10.1103/PhysRevC.88.014310
2012TH09 Phys.Rev. C 86, 044334 (2012) G.Thiamova, P.Alexa, Z.Hons, G.S.Simpson Examination of different strengths of octupole correlations in neutron-rich Pr and Pm isotopes NUCLEAR STRUCTURE 149,151Pr, 151,153Pm; calculated configuration admixtures in ground states and isomers, and E1 transition rates in low-lying states using quasiparticle phonon model combined with particle-rotor model. Octupole correlations and Coriolis mixing. Comparison with experimental data.
doi: 10.1103/PhysRevC.86.044334
2008SH18 J.Phys.(London) G35, 095108 (2008) Opportunity to observe an M0 transition NUCLEAR STRUCTURE 224Ac; calculated levels, J, π, configurations;rigid rotor model with quadrupole and octupole deformation; prediction for M0 transition.
doi: 10.1088/0954-3899/35/9/095108
2005BO47 Nucl.Phys. A762, 167 (2005) V.Bondarenko, J.Honzatko, I.Tomandl, T.von Egidy, H.-F.Wirth, A.M.Sukhovoj L.A.Malov, L.I.Simonova, P.Alexa, J.Berzins, R.Hertenberger, Y.Eisermann, G.Graw Low-spin mixed particle-hole structures in 185W NUCLEAR REACTIONS 184W(n, γ), E=thermal; measured prompt and delayed Eγ, Iγ, γγ-coin. 184W(polarized d, p), E=18, 21 MeV; 186W(polarized d, t), E=22 MeV; measured particle spectra, σ(θ), asymmetry. 185W deduced levels, J, π, γ-branching ratios, cross sections, binding energy, spectroscopic factors. DWBA analysis, quasiparticle-phonon model calculation. Enriched targets, Ge detectors, Q3D magnetic spectrograph.
doi: 10.1016/j.nuclphysa.2005.08.003
2004LI28 Czech.J.Phys. 54, 189 (2004) C.F.Liang, P.Paris, R.K.Sheline, P.Alexa Alpha decay of 221Rn and 217Po; level structure of 217Po and the 213Pb ground state RADIOACTIVITY 221Rn, 217Po(α) [from 225Ra decay]; measured Eα, Eγ, αγ-coin, T1/2; deduced hindrance factors. 217Po deduced levels, J, π. 213Pb deduced ground-state J, π.
doi: 10.1023/B:CJOP.0000014401.38668.54
2004SH25 Czech.J.Phys. 54, 721 (2004) R.K.Sheline, C.F.Liang, P.Paris, P.Alexa, J.Kvasil Reflection asymmetry in the state structure and spectroscopy of 224Ac NUCLEAR STRUCTURE 224Ac; analyzed α-decay data; deduced levels J, π, configurations, reflection asymmetric structure. Rigid rotor model.
doi: 10.1023/B:CJOP.0000038526.47082.c8
2003KV01 J.Phys.(London) G29, 753 (2003) J.Kvasil, N.Lo Iudice, Ch.Stoyanov, P.Alexa Compressional and toroidal dipole modes in nuclei NUCLEAR STRUCTURE 90Zr, 116Sn, 144Sm, 208Pb; analyzed dipole strength distributions; deduced sensitivity to single-particle energies, possible toroidal contribution.
doi: 10.1088/0954-3899/29/4/312
2003LO01 Phys.Lett. 551B, 71 (2003) M.Loewe, P.Alexa, T.Czosnyka, J.de Boer, J.Iwanicki, A.I.Levon, H.J.Maier, P.J.Napiorkowski, P.von Neumann-Cosel, A.Richter, C.Schlegel, G.Sletten, J.Srebrny, M.Wurkner Collective vibrations built on the Kπ = 9- high-spin isomer in 180Ta NUCLEAR REACTIONS 180mTa(58Ni, 58Ni'), E=225 MeV; measured Eγ, Iγ, (particle)γ-coin following Coulomb excitation. 180Ta deduced levels, J, π, B(M1), B(E2), quadrupole moments, γ-vibrational bands. 180mTa(36S, 36S'), E=1.8-3.5 MeV/nucleon; 180mTa(64Ni, 64Ni'), E=2.0-2.4 MeV/nucleon; measured ground-state Coulomb activation excitation functions; deduced intermediate state J, π, configuration. Nordball array.
doi: 10.1016/S0370-2693(02)03014-9
2003LO11 Nucl.Phys. A719, 275c (2003) M.Loewe, P.Alexa, J.de Boer, M.Wurkner The 180Ta production puzzle and the classical s-process NUCLEAR STRUCTURE 180Ta; analyzed levels, astrophysical production mechanisms.
doi: 10.1016/S0375-9474(03)00931-X
2002BO41 Nucl.Phys. A709, 3 (2002) V.Bondarenko, J.Berzins, P.Prokofjevs, L.Simonova, T.von Egidy, J.Honzatko, I.Tomandl, P.Alexa, H.-F.Wirth, U.Koster, Y.Eisermann, A.Metz, G.Graw, R.Hertenberger, L.Rubacek Interplay of Quasiparticle and Phonon Excitations in 181Hf Observed Through (n, γ) and (d(pol), p) Reactions NUCLEAR REACTIONS 180Hf(n, γ), E=thermal; measured Eγ, Iγ, γγ-coin, binding energy. 180Hf(polarized d, p), E=24 MeV; measured particle spectra. 181Hf deduced levels, J, π, γ-branching ratios, spectroscopic factors. Comparison with quasiphonon model predictions. Enriched targets, Ge detectors, Q3D spectrograph.
doi: 10.1016/S0375-9474(02)00646-2
2001KV01 Phys.Rev. C63, 054305 (2001) J.Kvasil, N.Lo Iudice, V.O.Nesterenko, A.Mackova, P.Alexa Orbital and Spin Magnetic Quadrupole Response in Heavy Nuclei NUCLEAR STRUCTURE 90Zr, 144,154Sm; calculated magnetic quadrupole strength functions, orbital and spin components. Proton-neutron RPA, comparisons with data.
doi: 10.1103/PhysRevC.63.054305
2001KV02 Phys.Rev. C63, 061305 (2001) J.Kvasil, R.G.Nazmitdinov, A.Tsvetkov, P.Alexa Signature Inversion in Axially Deformed 160, 162Tm NUCLEAR STRUCTURE 160,162Tm; analyzed levels, J, π; deduced role of Coriolis and neutron proton interactions in signature inversion mechanism. Microscopic approach.
doi: 10.1103/PhysRevC.63.061305
2001OL03 Acta Phys.Pol. B32, 865 (2001) P.Olbratowski, J.Srebrny, M.Loewe, P.Alexa, J.de Boer, J.Choinski, T.Czosnyka, J.Iwanicki, H.J.Maier, P.J.Napiorkowski, G.Sletten, M.Wurkner Coulomb Excitation of an Isomeric State in 181Ta via Intermediate States NUCLEAR REACTIONS 181Ta(58Ni, 58Ni'), E=225 MeV; measured Eγ, Iγ, (particle)γ-, γγ-coin following Coulomb excitation. 181Ta deduced high-spin levels, J, π, vibrational band, transition probabilities for population of isomeric state. Nordball array.
1999AL25 Acta Phys.Pol. B30, 1323 (1999) P.Alexa, I.Hrivnacova, J.Kvasil Electromagnetic Coupling between the Isomeric State and the Ground State in 180Ta NUCLEAR STRUCTURE 180Ta; calculated levels, J, π. Two-quasiparticle-plus-phonon model, Nuclear Astrophysics.
1999AL27 Acta Phys.Pol. B30, 1685 (1999) Symmetry-Breaking in the Lipkin Model
1999AL30 Int.J.Mod.Phys. E8, 337 (1999) P.Alexa, J.Kvasil, R.K.Sheline Neutron-Proton Interaction in Odd-Odd Spherical Nuclei Near 208Pb NUCLEAR STRUCTURE 206,208Tl, 208,210Bi; calculated levels, J, π, configurations; deduced neutron-proton interaction parameters. Generalized intermediate coupling model, Gaussian and delta potentials. Comparison with data, other calculations.
doi: 10.1142/S0218301399000240
1999LO13 Acta Phys.Pol. B30, 1319 (1999) M.Loewe, J.Besserer, J.De Boer, H.J.Maier, M.Wurkner, J.Srebrny, T.Czosnyka, J.Iwanicki, P.J.Napiorkowski, P.von Neumann-Cosel, A.Richter, C.Schlegel, H.J.Wollersheim, P.Alexa, A.I.Levon, S.A.Karamian, G.Sletten Depopulation of the Kπ = 9- Isomer in 180Ta via Coulomb Excitation NUCLEAR REACTIONS 180mTa(36S, 36S'), E=65-125 MeV; 180mTa(64Ni, 64Ni'), E=130, 150 MeV; measured Eγ, σ(θ) following Coulomb excitation. 180Ta deduced possible level energy. Discussed astrophysical consequences.
1999SH03 Phys.Rev. C59, 101 (1999) R.K.Sheline, P.Alexa, C.F.Liang, P.Paris The Configurations and Level Structure of 214At RADIOACTIVITY 218,218mFr, 214,214mAt, 210,210mBi(α) [from 222Ac decay following Th(p, X)222Ac]; measured Eα, Eγ, αγ-, γγ-coin. 210Bi, 214At deduced levels J, π, α branching. Mass and chemical separation of source. NUCLEAR STRUCTURE 214At; calculated single-particle levels; deduced configurations. Level structure of nearby odd-odd nuclides compared.
doi: 10.1103/PhysRevC.59.101
1997AL01 Phys.Rev. C55, 179 (1997) P.Alexa, J.Kvasil, V.M.Nguyen, R.K.Sheline Calculation of Shell Model Energies for States in 210Bi NUCLEAR STRUCTURE 209Bi; calculated levels. Generalized intermediate coupling model, np-interaction with Gaussian radial dependence.
doi: 10.1103/PhysRevC.55.179
1997AL13 Phys.Rev. C55, 3170 (1997) P.Alexa, J.Kvasil, R.K.Sheline Calculation of the Shell Model Energies for States in a Variety of Configurations in 208Bi NUCLEAR STRUCTURE 208Bi; calculated levels; deduced octupole phonon interaction parameter role. Generalized intermediate coupling model, Gaussian potential.
doi: 10.1103/PhysRevC.55.3170
1997AL23 Phys.Rev. C56, 3087 (1997) Shell Model Configurational Trends in Odd-Odd Nuclei Beyond 208Pb NUCLEAR STRUCTURE 210,212Bi, 212,216At, 216Fr; calculated levels, configurations. Comparison with experiment. Generalized intermediate coupling model.
doi: 10.1103/PhysRevC.56.3087
1996LI37 Phys.Rev. C54, 2304 (1996) C.F.Liang, P.Paris, R.K.Sheline, P.Alexa, A.Gizon α Decay of 216Fr and 212At RADIOACTIVITY 216Fr(α) [from 224Pa(α-decay) produced by 209Bi(18O, 3n), E=96 MeV]; 212At(α) [from 216Fr(α-decay)]; measured αγ-coin. 208Bi, 212At deduced levels, J, π, α-hindrance factors. Shell model configurations in 212At compared with 212,210Bi.
doi: 10.1103/PhysRevC.54.2304
1995AL25 Z.Phys. A353, 255 (1995) Simple Applications of the Pairing-Plus-Quadrupole-Plus-Octupole Model
doi: 10.1007/BF01292330
1995KV01 Int.J.Mod.Phys. E4, 457 (1995) J.Kvasil, R.K.Sheline, P.Alexa A Microscopic View of the Symmetry Properties of Reflection-Asymmetric Nuclei
doi: 10.1142/S0218301395000171
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