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NSR database version of May 24, 2024.

Search: Author = M.Stoyanova

Found 9 matches.

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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
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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
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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
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2021TO09      Phys.Lett. B 821, 136603 (2021)

D.Tonev, G.de Angelis, I.Deloncle, N.Goutev, G.De Gregorio, P.Pavlov, I.L.Pantaleev, S.Iliev, M.S.Yavahchova, P.G.Bizzeti, A.Demerdjiev, D.T.Dimitrov, E.Farnea, A.Gadea, E.Geleva, C.Y.He, H.Laftchiev, S.M.Lenzi, S.Lunardi, N.Marginean, R.Menegazzo, D.R.Napoli, F.Nowacki, R.Orlandi, H.Penttila, F.Recchia, E.Sahin, R.P.Singh, M.Stoyanova, C.A.Ur, H.-F.Wirth

Transition probabilities in 31P and 31S: A test for isospin symmetry

NUCLEAR REACTIONS 20Ne(12C, p), (12C, n)31P/31S, E=33 MeV from Piave-Alpi accelerator of LNL-Legnaro; measured Eγ, Iγ, γγ-coin, (proton)γγ-coin, γγ(θ), level T1/2 by DSAM and line-shape analysis using GASP array for γ rays and EUCLIDES Si-ball for charged particles. 31S, 31P; deduced levels, J, π, multipolarity, mixing ratios, B(E1), B(M2), violation of isospin symmetry for mirror nuclei. Comparison with Self-consistent beyond mean field calculations using Equation of Motion method based on a chiral potential, and with previous experimental data.

doi: 10.1016/j.physletb.2021.136603
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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
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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
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2019KA13      Phys.Rev. C 99, 024326 (2019)

V.Karayonchev, A.Blazhev, A.Esmaylzadeh, J.Jolie, M.Dannhoff, F.Diel, F.Dunkel, C.Fransen, L.M.Gerhard, R.-B.Gerst, L.Knafla, L.Kornwebel, C.Muller-Gatermann, J.-M.Regis, N.Warr, K.O.Zell, M.Stoyanova, P.Van Isacker

Lifetimes in 211At and their implications for the nuclear structure above 208Pb

NUCLEAR REACTIONS 208Pb(6Li, 3n), E=34 MeV; measured Eγ, Iγ, γγ-coin, half-lives of 13/2-, 17/2- and 23/2- levels in 211At by γγ-coin fast timing technique using HPGe detectors and LaBr3(Ce) scintillators for γ-rays at the Institute for Nuclear Physics, University of Cologne. 211At; deduced levels, B(M1), B(E2). Comparison with shell model calculations, and previous experimental values.

NUCLEAR STRUCTURE 209Bi, 210Po, 211At; calculated B(E2), magnetic dipole moments, B(M1) using two shell-model calculations: semiempirical interaction for three particles in a single j=9/2 shell, and the modified Kuo-Herling interaction in a multi-j model space. Comparison with experimental values.

doi: 10.1103/PhysRevC.99.024326
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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
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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
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