NSR Query Results
Output year order : Descending NSR database version of April 27, 2024. Search: Author = A.Harter Found 9 matches. 2024KN01 Phys.Rev. C 109, 014313 (2024) L.Knafla, K.Nomura, A.Esmaylzadeh, A.Harter, J.Jolie, V.Karayonchev, Y.H.Kim, U.Koster, M.Ley, C.Michelagnoli, A.Pfeil, J.-M.Regis, F.von Spee Investigating the prolate-to-oblate shape phase transition: Lifetime measurements and γ spectroscopy of the low-lying negative parity structure in 193Os
doi: 10.1103/PhysRevC.109.014313
2023HA29 Phys.Rev. C 108, 024305 (2023) A.Harter, A.Esmaylzadeh, L.Knafla, C.Fransen, F.v.Spee, J.Jolie, M.Ley, V.Karayonchev, J.Fischer, A.Pfeil Lifetime measurements in low yrast states and spectroscopic peculiarities in 182Os NUCLEAR REACTIONS 174Yb(12C, 4n)182Os, E=66 MeV; measured Eγ, Iγ, γγ-coin. 182Os; deduced levels, J, π, T1/2 of yrast 2+, 4+ and 6+ excited states, B(E2), quadrupole deformation parameter. Comparison to interacting boson model 1 (IBM-1) based calculations. Systematics of level energies for Os isotopes - 180,182,184,186Os and for N=106 isotones Hf, W, Os, Pt, Hg. Obtained values support the interpretation of 182Os as a rigid rotor. HORUS spectrometer equipped with 10 LaBr3(Ce) scintillators and 8 HPGe detectors at Cologne 10 MV FN-Tandem accelerator.
doi: 10.1103/PhysRevC.108.024305
2023KN04 Nucl.Instrum.Methods Phys.Res. A1052, 168279 (2023) L.Knafla, A.Harter, M.Ley, A.Esmaylzadeh, J.-M.Regis, D.Bittner, A.Blazhev, F.von Spee, J.Jolie Improving fast-timing time-walk calibration standards: Lifetime measurement of the 2+1 state in 152Gd RADIOACTIVITY 152Eu(β-); measured decay products, Eγ, Iγ; deduced γ-ray energies, the lifetime of the 2+ state. Comparison with available data. Fast-timing lifetime measurements.
doi: 10.1016/j.nima.2023.168279
2023LE18 Phys.Rev. C 108, 064313 (2023) M.Ley, L.Knafla, J.Jolie, A.Esmaylzadeh, A.Harter, A.Blazhev, C.Fransen, A.Pfeil, J.-M.Regis, P.Van Isacker Lifetime measurements in 92Mo: Investigation of seniority conservation in the N=50 isotones
doi: 10.1103/PhysRevC.108.064313
2023PF03 Phys.Rev. C 108, 034310 (2023) A.Pfeil, K.Nomura, N.Gavrielov, J.-M.Regis, U.Koster, Y.H.Kim, A.Esmaylzadeh, A.Harter, J.Jolie, L.Knafla, M.Ley, V.Karayonchev Lifetime measurements in 99Nb and 99Zr: Investigation of shape coexistence
doi: 10.1103/PhysRevC.108.034310
2022ES05 Phys.Rev. C 106, 064323 (2022) A.Esmaylzadeh, A.Blazhev, K.Nomura, J.Jolie, M.Beckers, C.Fransen, R.-B.Gerst, A.Harter, V.Karayonchev, L.Knafla, M.Ley, F.von Spee Investigation of γ softness: Lifetime measurements in 104, 106Ru NUCLEAR REACTIONS 104Ru(18O, 18O), (18O, 16O), E=57 MeV; measured reaction products, Eγ, Iγ, (particle)γ-coin. 104,106Ru; deduced levels, J, π, T1/2 of low-lying excited states, B(E2), B(M1), shape invariants. Recoil-distance Doppler shift technique. Comparison to mapped-IBM calculation based on a microscopic energy density functional, to the values obtained with Wilets-Jean γ-soft model and to previous experimental data. Results indicate γ-softness and point on traixilaity in 104,106Ru. Cologne plunger device in conjunction with 11 HPGe detectors arranged in backward and forward rings combined with 6 PIN diodes for detecting the backscattered beam-like light recoiling fragments 10 MV FN-Tandem accelerator.
doi: 10.1103/PhysRevC.106.064323
2022HA24 Phys.Rev. C 106, 024326 (2022) A.Harter, L.Knafla, G.Friessner, G.Hafner, J.Jolie, A.Blazhev, A.Dewald, F.Dunkel, A.Esmaylzadeh, C.Fransen, V.Karayonchev, K.Lawless, M.Ley, J.-M.Regis, K.O.Zell Lifetime measurements in the tungsten isotopes 176, 178, 180W NUCLEAR REACTIONS 164Dy(16O, 4n)176W, E=80 MeV; 172Yb(9Be, 3n)178W, E=40 MeV; 181Ta(p, 2n)180W, E=16 MeV; measured E(ce), Eγ, (ce)γ-coin, (ce)γγ-coin, γγ-coin, level T1/2 by (ce)γ(t) fast-timing method, and by recoil-distance Doppler-shift method using Cologne iron-free Orange spectrometer for conversion electrons, Cologne HORUS spectrometer for γ radiation, and Cologne coincidence plunger setup at the 10 MV FN Tandem accelerator of IKP-Cologne. 176,178,180W; deduced levels, J, π, T1/2, B(E2) of yrast positive-parity states up to 10+ for 176W and up to 8+ for 178,180W. Comparison with previous available experimental results, and with IBM-1 model calculations. Experimental and theoretical (by IBM-1 model with SU(3) and X(5) limits) systematics of excitation energies, deformation parameter β, quadrupole moment, B(E2), E(first 4+)/E(first 2+), B(E2)(first 4+)/B(E2)(first 2+) for 168,170,172,174,176,178,180,182,184,186W.
doi: 10.1103/PhysRevC.106.024326
2022KN02 Nucl.Instrum.Methods Phys.Res. A1042, 167463 (2022) L.Knafla, A.Esmaylzadeh, A.Harter, J.Jolie, U.Koster, M.Ley, C.Michelagnoli, J.-M.Regis Development of a new γ-γ angular correlation analysis method using a symmetric ring of clover detectors RADIOACTIVITY 177Lu, 152Eu(β-); measured decay products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, multipole mixing ratios using different configurations of the FIPPS instrument. Comparison with available data. NUCLEAR REACTIONS 115Sn(n, γ)116Sn, E thermal; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies, multipole mixing ratios. The Institut Laue-Langevin, using the EXILL and FATIMA spectrometer.
doi: 10.1016/j.nima.2022.167463
2021ES09 Phys.Rev. C 104, 064314 (2021) A.Esmaylzadeh, V.Karayonchev, K.Nomura, J.Jolie, M.Beckers, A.Blazhev, A.Dewald, C.Fransen, R.-B.Gerst, G.Hafner, A.Harter, L.Knafla, M.Ley, L.M.Robledo, R.Rodriguez-Guzman, M.Rudigier Lifetime measurements to investigate γ softness and shape coexistence in 102Mo NUCLEAR REACTIONS 100Mo(18O, 16O)102Mo, E=52 MeV; measured Eγ, Iγ, γγ-coin, T1/2 of levels by recoil-distance Doppler-shift method using an array of eleven HPGe detectors, and Cologne Plunger device at the Cologne FN Tandem accelerator facility. 102Mo; deduced levels, J, π, B(E2), B(M1), E0 transition probability; calculated deformation-energy surface in the (β, γ) plane. Comparison of levels and B(E2) with mapped interacting boson model (IBM) calculations, with microscopic input from Gogny mean-field. Systematics of 0+ and first 2+ states and B(E2) values in N=52-64, Sr, Zr, Mo and Ru isotopes. Discussed shape coexistence and γ-softness.
doi: 10.1103/PhysRevC.104.064314
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