NSR Query Results
Output year order : Descending NSR database version of April 26, 2024. Search: Author = D.Kocheva Found 15 matches. 2023ST05 Phys.Rev. C 108, 014316 (2023) K.Stoychev, M.Djongolov, V.Karayonchev, G.Rainovski, M.Ley, J.Jolie, D.Bittner, A.Blazhev, F.Dunkel, A.Esmaylzadeh, C.Fransen, J.Garbe, L.M.Gerhard, R.-B.Gerst, K.Geusen, K.A.Gladnishki, G.Hafner, D.Kalaydjieva, L.Klockner, L.Knafla, D.Kocheva, L.Kornwebel, C.Muller-Gatermann, E.Nikodem, J.-M.Regis, K.Schomacker, M.Stoyanova X-ray-γ fast-timing lifetime measurement of the 6+1 state in 206Po RADIOACTIVITY 206Po(IT)[from successive EC decay of 206Rn(EC)-206At(EC) produced in 194Pt(16O, 4n)206Rn, E=84 MeV]; measured X-rays, Eγ, Iγ, (X-rays)γ-coin, γγγ-coin. 206Po; deduced levels, J, π, T1/2 of the 4+ and 6+ excited states, B(E2). Lifetimes extracted via the generalized centroid difference (GCD) method. Systematics of the B(E2) for even-even Po isotopes with N<126. HORUS spectrometer consisting of 8 coaxial HPGe and 11 LaBr detectors at the FN-Tandem facility (Institute for Nuclear Physics, University of Cologne).
doi: 10.1103/PhysRevC.108.014316
2022KA52 Phys.Rev. C 106, 064305 (2022) V.Karayonchev, G.Rainovski, J.Jolie, A.Blazhev, A.Dewald, A.Esmaylzadeh, C.Fransen, P.John, L.Knafla, D.Kocheva, K.Schomacker, V.Werner, H.Naidja Lifetime measurements in the yrast band of 212Po with a shell-model investigation NUCLEAR REACTIONS 208Pb(18O, 14C)212Po, E=85 MeV; measured reaction products, Eγ, Iγ, γγ-coin, (particle)γ-coin. 212Po; deduced levels, J, π, B(E2), T1/2 of first 4+ and 6+ states; calculated levels, J, π, B(E2). Lifetimes obtained with recoil-distance Doppler-shift (RDDS) method. Shell-model calculations performed using H208 and KHPE interaction. Cologne plunger device, array of 11 HPGe detectors and array of 6 photovoltaic pin-diodes at FN-TANDEM accelerator (University of Cologne).
doi: 10.1103/PhysRevC.106.064305
2021FE09 Phys.Rev. C 104, 054316 (2021) A.Fernandez, A.Jungclaus, P.Golubev, D.Rudolph, L.G.Sarmiento, A.Gargano, H.Naidja, A.Astier, E.Dupont, A.Gadea, E.Nacher, A.Perea, K.Wimmer, E.Clement, G.Fremont, J.Goupil, C.Houarner, B.Jacquot, A.Korichi, A.Lemasson, H.J.Li, J.Ljungvall, L.Menager, R.M.Perez-Vidal, C.M.Petrache, D.Ralet, J.A.Ropert, F.Saillant, A.Saamark-Roth, G.S.Simpson, C.Spitaels, M.Zielinska, S.Ansari, J.Dudouet, A.Illana, M.Jurado, D.Kocheva, N.Lalovic, Ch.Lorenz, B.Quintana, G.Rainovski, N.Redon, G.Tocabens, D.Barrientos, G.Benzoni, B.Birkenbach, A.J.Boston, H.C.Boston, A.Bracco, M.Ciemala, J.Collado, D.M.Cullen, C.Domingo-Pardo, J.Eberth, V.Gonzalez, L.J.Harkness-Brennan, H.Hess, D.S.Judson, W.Korten, S.Leoni, A.Maj, R.Menegazzo, D.Mengoni, C.Michelagnoli, B.Million, D.R.Napoli, J.Nyberg, Zs.Podolyak, A.Pullia, P.Reiter, E.Sanchis, O.Stezowski, Ch.Theisen, J.J.Valiente-Dobon Reinterpretation of excited states in 212Po: Shell-model multiplets rather than α-cluster states NUCLEAR REACTIONS 12C(208Pb, 212Po)8Be, E=1187 MeV; measured Eγ, Iγ, (particle)γ-coin, (particle)γγ-coin, γγ(linear polarization) using 35 36-fold segmented AGATA crystals arranged in 12 triple clusters for γ detection and double-sided silicon strip detector (DSSSD) for particle detection. 212Po; deduced levels, J, π, multipolarities, configurations, exclusive reaction cross sections. Comparisons with shell-model calculations, with structure of 148Gd, and with earlier experimental results. Discussed previous interpretation as α-cluster states. NUCLEAR STRUCTURE 212Po; calculated levels, J, π, configurations, γ-ray branching ratios, B(M1), B(E2), wave-function decomposition for the yrast and yrare states using shell model with KHPE and H208 interactions. Comparison with experimental data.
doi: 10.1103/PhysRevC.104.054316
2021KA19 Phys.Rev. C 103, 044309 (2021) V.Karayonchev, M.Stoyanova, G.Rainovski, J.Jolie, A.Blazhev, M.Djongolov, A.Esmaylzadeh, C.Fransen, K.Gladnishki, L.Knafla, D.Kocheva, L.Kornwebel, J.-M.Regis, G.De Gregorio, A.Gargano Lifetimes and structures of low-lying negative-parity states of 209Po RADIOACTIVITY 209At(EC), (β+)[from successive α and ϵ decay of 213Fr, produced in 206Pb(11B, 4n)213Fr, E=56 MeV at the FN-Tandem facility of University of Cologne]; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) fast-timing method and analyzed by generalized centroid difference (GCD) method using eight HPGe detectors and 12 LaBr scintillators, with six of these placed inside BGO anti-Compton shields. 209Po; deduced levels, J, π, B(M1), B(E2). Comparison with shell-model calculation using a microscopic effective interaction derived from the realistic CD-Bonn potential. NUCLEAR STRUCTURE 209Po; calculated proton single-particle and neutron single-hole energies, levels, J, π, B(M1), B(E2), magnetic dipole and electric quadrupole moments, orbital composition and one-neutron pick-up spectroscopic factors of selected states, E2 matrix elements. Shell-model calculations with a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential within the framework of Q-box folded-diagram approach. Comparison with experimental data.
doi: 10.1103/PhysRevC.103.044309
2021KA36 Phys.Rev. C 104, 024311 (2021) D.Kalaydjieva, D.Kocheva, G.Rainovski, V.Karayonchev, J.Jolie, N.Pietralla, M.Beckers, A.Blazhev, A.Dewald, M.Djongolov, A.Esmaylzadeh, C.Fransen, K.A.Gladnishki, A.Goldkuhle, C.Henrich, I.Homm, K.E.Ide, P.R.John, R.Kern, J.Kleemann, Th.Kroll, C.Muller-Gatermann, M.Scheck, P.Spagnoletti, M.Stoyanova, K.Stoychev, V.Werner, A.Yaneva, S.S.Dimitrova, G.De Gregorio, H.Naidja, A.Gargano Microscopic structure of the one-phonon 2+ states of 208Po NUCLEAR REACTIONS 204Pb(12C, 8Be)208Po, E=62 MeV; measured Eγ, Iγ, (particle)γ-coin, half-lives of the first 2+ and 4+ levels by recoil-distance Doppler-shift (RDDS) method using the Cologne plunger device at the FN Tandem facility of the University of Cologne. 208Po; deduced levels, J, π, B(E2). Comparison with large-scale shell-model calculations. NUCLEAR STRUCTURE 208Po; calculated levels, J, π, B(E2), B(M1), magnetic dipole and electric quadrupole moments using large-scale shell-model calculations with an effective interaction derived from the realistic CD-Bonn nucleon-nucleon potential. Comparison with experimental data.
doi: 10.1103/PhysRevC.104.024311
2021VO14 Phys.Lett. B 821, 136624 (2021) M.von Tresckow, M.Rudigier, T.M.Shneidman, T.Kroll, M.Boromiza, C.Clisu, C.Costache, d.Filipescu, N.M.Florea, I.Gheorghe, K.Gladnishki, A.Ionescu, D.Kocheva, R.Lica, N.Marginean, R.Marginean, K.R.Mashtakov, C.Mihai, R.E.Mihai, A.Negret, C.R.Nita, A.Olacel, A.Oprea, S.Pascu, G.Rainovski, T.Sava, M.Scheck, P.Spagnoletti, C.Sotty, L.Stan, I.Stiru, S.Toma, A.Turturica, S.Ujeniuc New evidence for alpha clustering structure in the ground state band of 212Po NUCLEAR REACTIONS 208Pb(10B, 6Li)212Po, E=51 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, level T1/2, B(E2). ROSPHERE array, Horia Hulubei National Institute. Delayed coincidence fast-timing method.
doi: 10.1016/j.physletb.2021.136624
2020KE07 Phys.Rev. C 102, 041304 (2020) R.Kern, R.Zidarova, N.Pietralla, G.Rainovski, R.Stegmann, A.Blazhev, A.Boukhari, J.Cederkall, J.G.Cubiss, M.Djongolov, C.Fransen, L.P.Gaffney, K.Gladnishki, E.Giannopoulos, H.Hess, J.Jolie, V.Karayonchev, L.Kaya, J.M.Keatings, D.Kocheva, Th.Kroll, O.Moller, G.G.O'Neill, J.Pakarinen, P.Reiter, D.Rosiak, M.Scheck, J.Snall, P.-A.Soderstrom, P.Spagnoletti, M.Stoyanova, S.Thiel, A.Vogt, N.Warr, A.Welker, V.Werner, J.Wiederhold, H.De Witte Restoring the valence-shell stabilization in 140Nd NUCLEAR REACTIONS 208Pb(140Nd, 140Nd'), E=4.62 MeV/nucleon, [140Nd beam from Ta(p, X), E=1.4 GeV at HIE-ISOLDE-CERN, and isotopic selection by RILIS and REXEBIS]; measured Eγ, Iγ, scattered particles, (particle)γ- and (particle)γγ-coin using Miniball array and double-sided silicon strip detector (DSSD). 140Nd; deduced levels, J, π, Coulomb excitation cross sections, B(E2), B(E3), B(M1) by analyzing data using multistep Coulomb-excitation least-squares fitting code GOSIA, identification of the third 2+ state as the main fragment of the one-quadrupole-phonon proton-neutron mixed-symmetry state, and degree of F-spin mixing. Systematics of B(M1) strengths for N=80 isotones of 132Te, 134Xe, 136Ba, 138Ce and 140Nd, and compared with theoretical predictions.
doi: 10.1103/PhysRevC.102.041304
2020YA24 Eur.Phys.J. A 56, 246 (2020) A.Yaneva, D.Kocheva, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, A.Dewald, M.Djongolov, C.Fransen, K.A.Gladnishki, C.Henrich, I.Homm, K.E.Ide, P.R.John, D.Kalaydjieva, V.Karayonchev, R.Kern, J.Kleemann, Th.Kroll, C.Muller-Gatermann, M.Scheck, P.Spagnoletti, M.Stoyanova, V.Werner Experimental evidence for low-lying quadrupole isovector excitation of 208Po NUCLEAR REACTIONS 204Pb(12C, 8Be), E=62 MeV; measured reaction products, Eγ, Iγ, γ-γ-coin. 208Po; deduced γ-ray energies and intensities, level lifetimes, B(E2), B(M1) using the Doppler-shift attenuation method.
doi: 10.1140/epja/s10050-020-00259-w
2019RA28 Phys.Lett. B 797, 134797 (2019) D.Ralet, E.Clement, G.Georgiev, A.E.Stuchbery, M.Rejmund, P.Van Isacker, G.de France, A.Lemasson, J.Ljungvall, C.Michelagnoli, A.Navin, D.L.Balabanski, L.Atanasova, A.Blazhev, G.Bocchi, R.Carroll, J.Dudouet, E.Dupont, B.Fornal, S.Franchoo, C.Fransen, C.Muller-Gatermann, A.Goasduff, A.Gadea, P.R.John, D.Kocheva, T.Konstantinopoulos, A.Korichi, A.Kusoglu, S.M.Lenzi, S.Leoni, R.Lozeva, A.Maj, R.Perez, N.Pietralla, C.Shand, O.Stezowski, D.Wilmsen, D.Yordanov, D.Barrientos, P.Bednarczyk, B.Birkenbach, A.J.Boston, H.C.Boston, I.Burrows, B.Cederwall, M.Ciemala, J.Collado, F.Crespi, D.Cullen, H.J.Eberth, J.Goupil, L.Harkness, H.Hess, A.Jungclaus, W.Korten, M.Labiche, R.Menegazzo, D.Mengoni, B.Million, J.Nyberg, Zs.Podolyak, A.Pullia, B.Quintana Arnes, F.Recchia, P.Reiter, F.Saillant, M.D.Salsac, E.Sanchis, C.Theisen, J.J.Valiente Dobon, O.Wieland Evidence of octupole-phonons at high spin in 207Pb NUCLEAR REACTIONS 100Mo(208Pb, 207Pb), E=6.25 MeV/nucleon; measured reaction products, Eγ, Iγ. 207Pb; deduced γ-ray energies, T1/2, B(E3) for 19/2- state. Recoil Distance Doppler-Shift (RDDS) method.
doi: 10.1016/j.physletb.2019.134797
2019ST13 Phys.Rev. C 100, 064304 (2019) M.Stoyanova, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, M.Beckers, A.Dewald, M.Djongolov, A.Esmaylzadeh, C.Fransen, L.M.Gerhard, K.A.Gladnishki, S.Herb, P.R.John, V.Karayonchev, J.M.Keatings, R.Kern, L.Knafla, D.Kocheva, L.Kornwebel, Th.Kroll, M.Ley, K.M.Mashtakov, C.Muller-Gatermann, J.-M.Regis, M.Scheck, K.Schomacker, J.Sinclair, P.Spagnoletti, C.Surder, N.Warr, V.Werner, J.Wiederhold Lifetimes of the 4+1 states of 206Po and 204Po: A study of the transition from noncollective seniority-like mode to collectivity NUCLEAR REACTIONS 197Au(11B, 4n)204Po, E=55 MeV; 198Pt(12C, 4n)206Po, E=65 MeV; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) fast timing technique using the HORUS spectrometer of the FN Tandem facility at the University of Cologne. 204,206Po; deduced levels, J, π, B(E2) for the first 4+ states in both the isotopes, and for the first 2+ in 204Po, configurations; discussed transition from single-particle seniority like mode to collective mode. Comparison with two-state mixing calculations. Systematics of energies, R4/2 ratios, B(E2) and magnetic moments for the yrast levels in 200,202,204,206,208,210Po.
doi: 10.1103/PhysRevC.100.064304
2017KO03 Phys.Rev. C 95, 014309 (2017) T.Konstantinopoulos, P.Petkov, A.Goasduff, T.Arici, A.Astier, L.Atanasova, M.Axiotis, D.Bonatsos, P.Detistov, A.Dewald, M.J.Eller, V.Foteinou, A.Gargano, G.Georgiev, K.Gladnishki, A.Gottardo, S.Harissopulos, H.Hess, S.Kaim, D.Kocheva, A.Kusoglu, A.Lagoyannis, J.Ljungvall, R.Lutter, I.Matea, B.Melon, T.J.Mertzimekis, A.Nannini, C.M.Petrache, A.Petrovici, G.Provatas, P.Reiter, M.Rocchini, S.Roccia, M.Seidlitz, B.Siebeck, D.Suzuki, N.Warr, H.De Witte, T.Zerrouki Lifetime measurements in 100Ru NUCLEAR REACTIONS 88Sr(14C, 2n), E=40, 46 MeV; measured Eγ, half-lives of 2+, 4+, 6+ and 8+ yrast levels by recoil-distance Doppler shift (RDDS) and Doppler-shift attenuation method (DSAM) using ORGAM array and eight detectors from Miniball array at 15 MV Tandem accelerator of the ALTO laboratory in Orsay. 100Ru; deduced levels, B(E2), not the best candidate for E(5) symmetry. Comparison with excited Vampir, shell-model calculations, and theoretical E(5) level scheme.
doi: 10.1103/PhysRevC.95.014309
2017KO34 Eur.Phys.J. A 53, 175 (2017) D.Kocheva, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, A.Astier, R.Altenkirch, S.Ansari, Th.Braunroth, M.L.Cortes, A.Dewald, F.Diel, M.Djongolov, C.Fransen, K.Gladnishki, A.Hennig, V.Karayonchev, J.M.Keatings, E.Kluge, J.Litzinger, C.Muller-Gatermann, P.Petkov, M.Rudigier, M.Scheck, Ph.Scholz, P.Spagnoletti, M.Spieker, C.Stahl, R.Stegmann, M.Stoyanova, P.Thole, N.Warr, V.Werner, W.Witt, D.Wolk, K.O.Zell, P.Van Isacker, V.Yu.Ponomarev A revised B(E2;2+1 → 0+1) value in the semi-magic nucleus 210Po NUCLEAR REACTIONS 208Pb(12C, 10Be), E=62 MeV; measured Eγ, Iγ(θ), γγ-coin, (particle)γ-coin using 11 HPGe, light reaction fragments using solar cells array. 210Po; deduced 2+1 state T1/2 using the line shape of the transition, branching ratios to this state from upper states, B(E1), B(E2), B(E3), B(M1), T1/2 of three states and transitions; calculated low-lying states energy, structure, B(E1), B(E2), B(E3), B(M1) using QPM (Quasiparticle Phonon Model). Compared with data.
doi: 10.1140/epja/i2017-12367-5
2017KO38 Phys.Rev. C 96, 044305 (2017) D.Kocheva, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, R.Altenkirch, S.Ansari, A.Astier, M.Bast, M.Beckers, Th.Braunroth, M.Cappellazzo, A.Dewald, F.Diel, M.Djongolov, C.Fransen, K.Gladnishki, A.Goldkuhle, A.Hennig, V.Karayonchev, J.M.Keatings, E.Kluge, Th.Kroll, J.Litzinger, K.Moschner, C.Muller-Gatermann, P.Petkov, M.Scheck, Ph.Scholz, T.Schmidt, P.Spagnoletti, C.Stahl, R.Stegmann, A.Stolz, A.Vogt, N.Warr, V.Werner, D.Wolk, J.C.Zamora, K.O.Zell, V.Yu.Ponomarev, P.Van Isacker Low collectivity of the 2+1 state of 212Po NUCLEAR REACTIONS 208Pb(12C, 8Be)212Po, E=64 MeV; measured Eγ, Iγ, (particle)γ-coin, half-life of the first 2+ state by recoil-distance Doppler-shift (RDDS) method at the FN Tandem facility of the University of Cologne. 212Po; deduced levels, J, π, B(E2). Comparisons with levels and B(E2) of 210Po and 210Pb, and with theoretical calculations using shell model. Systematics of B(E2) values for the first 2+ states in 20Ne, 44Ti, 52Ti, 136Te, 212Po, nuclei with two valence protons and two valence neutrons.
doi: 10.1103/PhysRevC.96.044305
2017RA09 Phys.Scr. 92, 054004 (2017) D.Ralet, G.Georgiev, A.E.Stuchbery, E.Cement, A.Lemasson, C.Michelagnoli, M.Rejmund, L.Atanasova, D.L.Balabanski, G.Bocchi, R.Carroll, A.Dewald, J.Dudouet, B.Fornal, G.de France, S.Franchoo, C.Fransen, C.Muller-Gatermann, A.Goasduff, A.Gadea, B.Jacquot, P.R.John, D.Kocheva, T.Konstantinopoulos, A.Korichi, A.Kusoglu, S.M.Lenzi, S.Leoni, J.Ljungvall, R.Lozeva, A.Maj, A.Navin, R.Perez, N.Pietralla, C.Shand, O.Stezowski, D.Yordanov Toward lifetime and g factor measurements of short-lived states in the vicinity of 208Pb NUCLEAR REACTIONS 100Mo(208Pb, X)206Pb/207Pb/208Pb, E=6.25 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies. Preliminary data for the lifetime measurements with Cologne plunger device.
doi: 10.1088/1402-4896/aa6942
2016KO03 Phys.Rev. C 93, 011303 (2016) D.Kocheva, G.Rainovski, J.Jolie, N.Pietralla, C.Stahl, P.Petkov, A.Blazhev, A.Hennig, A.Astier, Th.Braunroth, M.L.Cortes, A.Dewald, M.Djongolov, C.Fransen, K.Gladnishki, V.Karayonchev, J.Litzinger, C.Muller-Gatermann, M.Scheck, Ph.Scholz, R.Stegmann, P.Thole, V.Werner, W.Witt, D.Wolk, P.Van Isacker Low-lying isovector 2+ valence-shell excitations of 212Po NUCLEAR REACTIONS 208Pb(12C, 2α)212Po, E=62 MeV; measured Eγ, Iγ, (particle)γ-, γγ-coin, enriched target, level half-lives by DSAM and line-shape analysis using an array of 12 HPGe detectors for γ detection, and solar cell array for reaction products at FN Tandem facility of the University of Cologne. 212Po; deduced levels, J, π, B(M1), B(E2) of second and third 2+ states as candidates for one-phonon mixed-symmetry states (MSS). Comparison with simple single-j shell model calculation. 211Po; observed γ rays. 209,210Po, 208Pb, 209Bi; reaction products measured in coincidence with γ rays.
doi: 10.1103/PhysRevC.93.011303
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