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NSR database version of April 26, 2024.

Search: Author = R.Stegmann

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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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2019KE01      Phys.Rev. C 99, 011303 (2019)

R.Kern, R.Stegmann, N.Pietralla, G.Rainovski, M.P.Carpenter, R.V.F.Janssens, M.Lettmann, O.Moller, T.Moller, C.Stahl, V.Werner, S.Zhu

Nuclear isovector valence-shell excitation of ²⁰²Hg

NUCLEAR REACTIONS ¹²C(²⁰²Hg, ²⁰²Hg'), E=890 MeV; measured Eγ, Iγ, γ(θ), γγ-coin using the Gammasphere array at ATLAS-ANL facility. ²⁰²Hg; deduced levels, J, π, multipolarities, mixing ratios, B(E1), B(E2), B(E3), B(M1), mixed-symmetry 2+ state, upper limits for the F-spin mixing matrix elements from analysis of data for ¹³⁶Ba, ¹³⁸Ce, ²⁰²Hg, and ²⁰⁴Hg. Comparison with previous experimental values in the Nuclear Data Sheets.

doi: 10.1103/PhysRevC.99.011303
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2018WI09      Phys.Rev. C 98, 041302 (2018)

W.Witt, V.Werner, N.Pietralla, M.Albers, A.D.Ayangeakaa, B.Bucher, M.P.Carpenter, D.Cline, H.M.David, A.Hayes, C.Hoffman, R.V.F.Janssens, B.P.Kay, F.G.Kondev, W.Korten, T.Lauritsen, O.Moller, G.Rainovski, G.Savard, D.Seweryniak, J.Smith, R.Stegmann, S.Zhu, C.Y.Wu

Sub-shell closure and shape coexistence in the transitional nucleus ⁹⁸Zr

NUCLEAR REACTIONS ¹⁹⁶Pt(⁹⁸Zr, ⁹⁸Zr'), E=464 MeV from CARIBU source at ATLAS-ANL facility; measured recoils, Eγ, Iγ, (recoil)γ-coin using CHICO2 array of segmented parallel-plate avalanche counter (PPAC) for recoil detection, and GRETINA array of segmented HPGe detectors for γ detection. Coulomb excitation. ⁹⁸Zr; deduced levels, upper limit of B(E2) for the first 2+ state. Comparison with shell model and Monte-Carlo shell model calculations, and with previous experimental values. Systematics of B(E2) values for the first 2+ states in ^{90,92,94,96,98,100,102,104,106}Zr.

doi: 10.1103/PhysRevC.98.041302
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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 T_1/2 using the line shape of the transition, branching ratios to this state from upper states, B(E1), B(E2), B(E3), B(M1), T_1/2 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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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
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2017ST09      Phys.Lett. B 770, 77 (2017)

R.Stegmann, C.Stahl, G.Rainovski, N.Pietralla, C.Stoyanov, M.P.Carpenter, R.V.F.Janssens, M.Lettmann, T.Moller, O.Moller, V.Werner, S.Zhu

Identification of the one-quadrupole phonon 2⁺_{1, ms} state of ²⁰⁴Hg

NUCLEAR REACTIONS ¹²C, ²⁷Al(²⁰⁴Hg, ²⁰⁴Hg'), E=890 MeV; measured reaction products, Eγ, Iγ. ²⁰⁴Hg; deduced energy levels, J, π, B(E2), level T_1/2. DSAM, Coulomb excitation. Comparison with Quasi-particle Phonon Model (QPM) calculations.

doi: 10.1016/j.physletb.2017.04.032
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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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2015ST08      Phys.Rev. C 91, 054326 (2015)

R.Stegmann, C.Bauer, G.Rainovski, N.Pietralla, C.Stahl, S.Bonig, S.Ilieva, A.Blazhev, A.Damyanova, M.Danchev, K.Gladnishki, J.Jolie, R.Lutter, J.Pakarinen, D.Radeck, E.Rapisarda, P.Reiter, M.Scheck, B.Siebeck, T.Stora, P.Thole, T.Thomas, M.Thurauf, M.J.Vermeulen, D.Voulot, N.Warr, F.Wenander, V.Werner, H.De Witte

Evolution of quadrupole collectivity in N=80 isotones toward the Z=64 subshell gap: The B(E2; 2⁺₁ → 0⁺₁) value of ¹⁴²Sm

NUCLEAR REACTIONS ⁴⁸Ti, ⁹⁴Mo(¹⁴²Sm, ¹⁴²Sm'), E=405 MeV, [secondary ¹⁴²Sm beam from Ta(p, X), E=1.4 GeV from PS booster at CERN and using RILIS and GPS setup at ISOLDE-CERN]; measured Eγ, Iγ, (particle)γ-coin, γ-particle yields as function of angle using MINIBALL HPGe-detector array at REX-ISOLDE-CERN facility. Coulomb excitation technique. ¹⁴²Sm; deduced matrix elements and B(E2) for the first 2+ state in ¹⁴²Sm. Systematics of B(E2) values for first 2+ state in ¹³⁰Sn, ¹³²Te, ¹³⁴Xe, ¹³⁶Ba, ¹³⁸Ce, ¹⁴⁰Nd, ¹⁴²Sm. Comparison with shell-model calculations.

RADIOACTIVITY ¹⁴²Pm, ^142,142mEu, ¹⁴²Sm(EC), (β⁺); measured Iγ; deduced ^142mEu/¹⁴²Eu isomeric ratio, and M(¹⁴²Eu)/M(¹⁴²Sm).

doi: 10.1103/PhysRevC.91.054326
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2013BA38      Phys.Rev. C 88, 021302 (2013)

C.Bauer, G.Rainovski, N.Pietralla, D.Bianco, A.Blazhev, T.Bloch, S.Bonig, A.Damyanova, M.Danchev, K.A.Gladnishki, T.Kroll, J.Leske, N.Lo Iudice, T.Moller, K.Moschner, J.Pakarinen, P.Reiter, M.Scheck, M.Seidlitz, B.Siebeck, C.Stahl, R.Stegmann, T.Stora, Ch.Stoyanov, D.Tarpanov, M.J.Vermeulen, D.Voulot, N.Warr, F.Wenander, V.Werner, H.De Witte

Local suppression of collectivity in the N=80 isotones at the Z=58 subshell closure

NUCLEAR REACTIONS ⁴⁸Ti, ⁶⁴Zn(¹⁴⁰Nd, ¹⁴⁰Nd'), E=399 MeV; measured Eγ, Iγ, (particle)γ-coin, yields using RILIS source and Miniball array at REX-ISOLDE-CERN facility. ¹⁴⁰Nd; deduced E2 and diagonal matrix elements, B(E2) and Q₂ for first 2+ state from Coulomb excitation. ⁴⁸Ti, ⁶⁴Zn, ¹⁴⁰Sm; measured Eγ for first 2+ states. Comparison with shell-model and QPM calculations. Systematics of B(E2) values for first 2+ states in even-even N=80, Z=50-60 nuclei.

doi: 10.1103/PhysRevC.88.021302
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