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Search: Author = S.Ansari

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2023PA40      Eur.Phys.J. A 59, 276 (2023)

G.Pasqualato, S.Ansari, J.S.Heines, V.Modamio, A.Gorgen, W.Korten, J.Ljungvall, E.Clement, J.Dudouet, A.Lemasson, T.R.Rodriguez, J.M.Allmond, T.Arici, K.S.Beckmann, A.M.Bruce, D.Doherty, A.Esmaylzadeh, E.R.Gamba, L.Gerhard, J.Gerl, G.Georgiev, D.P.Ivanova, J.Jolie, Y.-H.Kim, L.Knafla, A.Korichi, P.Koseoglou, M.Labiche, S.Lalkovski, T.Lauritsen, H.-J.Li, L.G.Pedersen, S.Pietri, D.Ralet, J.M.Regis, M.Rudigier, S.Saha, E.Sahin, S.Siem, P.Singh, P.-A.Soderstrom, C.Theisen, T.Tornyi, M.Vandebrouck, W.Witt, M.Zielinska, D.Barrientos, P.Bednarczyk, G.Benzoni, A.J.Boston, H.C.Boston, A.Bracco, B.Cederwall, M.Ciemala, G.de France, C.Domingo-Pardo, J.Eberth, A.Gadea, V.Gonzalez, A.Gottardo, L.J.Harkness-Brennan, H.Hess, D.S.Judson, A.Jungclaus, S.M.Lenzi, S.Leoni, R.Menegazzo, D.Mengoni, C.Michelagnoli, D.R.Napoli, J.Nyberg, Zs.Podolyak, A.Pullia, F.Recchia, P.Reiter, K.Rezynkina, M.D.Salsac, E.Sanchis, M.Senyigit, M.Siciliano, J.Simpson, D.Sohler, O.Stezowski, J.J.Valiente-Dobon, D.Verney

Shape evolution in even-mass 98-104Zr isotopes via lifetime measurements using the γγ coincidence technique

NUCLEAR REACTIONS 9Be(238U, X)98Zr/100Zr/102Zr/104Zr, E=6.2 MeV/nucleon; measured reaction products, Eγ, Iγ, γ-γ-coin. 104Mo, 102Nb; deduced γ-ray energies and relative intensities, J, π, level T1/2, B(E2), shape coexistence. Comparison with calculated values. The Differential Decay Curve Method (DDCM), the Recoil Distance Doppler Shift technique. The magnetic spectrometer VAMOS++, GANIL, the Orsay Universal Plunger system.

doi: 10.1140/epja/s10050-023-01172-8
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2022SM02      Phys.Rev. C 106, 014312 (2022)

J.Smallcombe, A.B.Garnsworthy, W.Korten, P.Singh, F.A.Ali, C.Andreoiu, S.Ansari, G.C.Ball, C.J.Barton, S.S.Bhattacharjee, M.Bowry, R.Caballero-Folch, A.Chester, S.A.Gillespie, G.F.Grinyer, G.Hackman, C.Jones, B.Melon, M.Moukaddam, A.Nannini, P.Ruotsalainen, K.Starosta, C.E.Svensson, R.Wadsworth, J.Williams

Improved measurement of the 02+ → 01+ E0 transition strength for 72Se using the SPICE spectrometer

NUCLEAR REACTIONS 40Ca(36Ar, 4p), E=120 MeV from TRIUMF-ISAC-II linear accelerator; measured reaction products, Eγ, Iγ, ce, γγ-coin, (ce)γ-coin, and (ce)γ(t) using TIGRESS array of 12 HPGe clover detectors for γ detection, and SPICE array and a Si(Li) detector for conversion electrons. 72Se; deduced levels, T1/2 of 937, 0+ level, I(937, E0)/I(γ+ce)(75γ, E2) ratio, qK2(E0/E2) and ρ2(E0, 937) transition strength. Comparison with previous experimental results, and with two state mixing theoretical calculations for the g.s. and the first 2+ state. Systematics of experimental B(E2) and ρ2(E0) strengths in 66,68,70,72,74Ge, 68,70,72,74,76Se, 70,72,74,76,78Kr.

doi: 10.1103/PhysRevC.106.014312
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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
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2020BE10      Phys.Rev. C 101, 054311 (2020)

T.A.Berry, Zs.Podolyak, R.J.Carroll, R.Lica, B.A.Brown, H.Grawe, Ch.Sotty, N.K.Timofeyuk, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, M.Brunet, J.R.Cresswell, C.Fahlander, L.M.Fraile, H.O.U.Fynbo, E.Gambna, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, M.Kowalska, J.Kurcewicz, I.Kuti, S.Lalkovski, I.Lazarus, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, A.Negret, S.Nae, C.Nita, S.Pascu, R.D.Page, Z.Patel, A.Perea, J.Phrompao, M.Piersa, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, M.Rudigier, C.M.Shand, R.Shearman, E.C.Simpson, S.Stegemann, T.Stora, O.Tengblad, A.Turturica, P.Van Duppen, V.Vedia, P.M.Walker, N.Warr, F.P.Wearing, H.De Witte

Octupole states in 207Tl studied through β decay

RADIOACTIVITY 207Hg(β-)[from 208Pb(p, X)207Hg, E=1.4 GeV]; measured Eγ, Iγ, βγ- and βγγ-coin, γγ(θ) using plastic scintillators for β-detection and four HPGe detectors for γ-detection at CERN-ISOLDE. 207Tl; deduced levels J, π, β feedings, multipolarities, logft, B(M1), B(E1), B(E2), B(M2), B(E3), configurations. Discussion of octupole phonon states. Comparison with state-of-the-art large-scale shell-model calculations, and with previous experimental results.

doi: 10.1103/PhysRevC.101.054311
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2020CA25      Phys.Rev.Lett. 125, 192501 (2020)

R.J.Carroll, Z.Podolyak, T.Berry, H.Grawe, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, M.Brunet, J.R.Creswell, L.M.Fraile, C.Fahlander, H.O.U.Fynbo, E.R.Gamba, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.T.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, J.Kurcewicz, I.Kuti, S.Lalkovski, I.H.Lazarus, R.Lica, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, A.Negret, C.Nita, S.Pascu, R.D.Page, Z.Patel, A.Perea, J.Phrompao, M.Piersa, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, M.Rudigier, C.M.Shand, R.Shearman, S.Stegemann, T.Stora, C.Sotty, O.Tengblad, P.Van Duppen, V.Vedia, R.Wadsworth, P.M.Walker, N.Warr, F.Wearing, H.De Witte

Competition between Allowed and First-Forbidden β Decay: The Case of 208Hg → 208Tl

RADIOACTIVITY 208Hg(β-) [from Pb(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π, branching ratios, B(Eλ). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.192501
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2019BE37      Phys.Lett. B 793, 271 (2019)

T.A.Berry, Zs.Podolyak, R.J.Carroll, R.Lica, H.Grawe, N.K.Timofeyuk, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, J.Creswell, C.Fahlander, L.M.Fraile, H.O.U.Fynbo, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, J.Kurcewicz, I.Kuti, S.Lalkovski, I.Lazarus, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, S.Nae, A.Negret, C.Nita, R.D.Page, S.Pascu, Z.Patel, A.Perea, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, C.M.Shand, E.C.Simpson, Ch.Sotty, S.Stegemann, T.Stora, O.Tengblad, A.Turturica, P.Van Duppen, V.Vedia, R.Wadsworth, P.M.Walker, N.Warr, F.Wearing, H.De Witte

Investigation of the Λ n=0 selection rule in Gamow-Teller transitions: The β-decay of 207Hg

RADIOACTIVITY 207Hg(β-) [from Pb(p, X)207Hg, E=1.4 GeV]; measured decay products, Eβ, Iβ, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies and intensities, B(Eλ), branching ratios, partial level scheme, J, π, log ft limit, spectroscopic factors.

doi: 10.1016/j.physletb.2019.04.039
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2017AN15      Phys.Rev. C 96, 054323 (2017)

S.Ansari, J.-M.Regis, J.Jolie, N.Saed-Samii, N.Warr, W.Korten, M.Zielinska, M.-D.Salsac, A.Blanc, M.Jentschel, U.Koster, P.Mutti, T.Soldner, G.S.Simpson, F.Drouet, A.Vancraeyenest, G.de France, E.Clement, O.Stezowski, C.A.Ur, W.Urban, P.H.Regan, Zs.Podolyak, C.Larijani, C.Townsley, R.Carroll, E.Wilson, H.Mach, L.M.Fraile, V.Paziy, B.Olaizola, V.Vedia, A.M.Bruce, O.J.Roberts, J.F.Smith, M.Scheck, T.Kroll, A.-L.Hartig, A.Ignatov, S.Ilieva, S.Lalkovski, N.Marginean, T.Otsuka, N.Shimizu, T.Togashi, Y.Tsunoda

Experimental study of the lifetime and phase transition in neutron-rich 98, 100, 102Zr

NUCLEAR REACTIONS 235U(n, F), 241Pu(n, F), E=cold neutrons beam from PF1B, Institut Laue-Langevin (ILL), Grenoble; measured Eγ, γγ-coin, half-lives of the first 2+, 4+ and 6+ levels by fast-timing technique using the EXILL-FATIMA array consisting of eight EXOGAM clovers and 16 LaBr3(Ce) scintillators; fast-timing coincidence events analyzed using method of mirror symmetric centroid difference (MSCD) and generalized centroid difference method (GCDM). 98,100,102Zr; deduced levels, B(E2). Comparison with Interacting Boson model and Monte-Carlo shell-model calculations, and with previous experimental results. Systematics of B(E2) values for the first 2+, 4+ and 6+ states in 96,98,100,102,104,106Zr.

doi: 10.1103/PhysRevC.96.054323
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2017KA10      Phys.Rev. C 95, 034316 (2017)

V.Karayonchev, J.-M.Regis, J.Jolie, A.Blazhev, R.Altenkirch, S.Ansari, M.Dannhoff, F.Diel, A.Esmaylzadeh, C.Fransen, R.-B.Gerst, K.Moschner, C.Muller-Gatermann, N.Saed-Samii, S.Stegemann, N.Warr, K.O.Zell

Evolution of collectivity in the N=100 isotones near 170Yb

NUCLEAR REACTIONS 168Er(α, 2n), E=27 MeV; measured Eγ, Iγ, level half-lives by γγ(t) using electronic γ-γ fast-timing technique using HPGe detectors and LaBr3(Ce) detectors at Cologne 10 MV FN-Tandem accelerator. 170Yb; deduced levels, yrast band, B(E2). Comparison with confined beta soft (CBS) model calculations, X(5) predictions, and with previous experimental results. Systematics of ground state band energies and B(E2) in N=100 isotones of 168Er, 170Yb, 172Hf, 174W and 176Os.

doi: 10.1103/PhysRevC.95.034316
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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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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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