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NSR database version of April 24, 2024.

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2023OM01      Nucl.Instrum.Methods Phys.Res. A1047, 167784 (2023)

P.D.O'Malley, T.Ahn, D.W.Bardayan, M.Brodeur, S.Coil, J.J.Kolata

TriSol: A major upgrade of the TwinSol RNB facility

doi: 10.1016/j.nima.2022.167784
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2022SI17      Phys.Rev. C 106, 015803 (2022)

A.Sieverding, J.S.Randhawa, D.Zetterberg, R.J.deBoer, T.Ahn, R.Mancino, G.Martinez-Pinedo, W.R.Hix

Role of low-lying resonances for the 10Be(p, α)7Li reaction rate and implications for the formation of the Solar System

NUCLEAR REACTIONS 10Be(p, α), (α, n), E not given; 10Be(ν, e-), E=2.8-10 MeV; analyzed reaction rates, σ; deduced influence on the content of 10Be in supernovae environment. 10Be(p, α), E<1.5 MeV; analyzed reaction rate, experimental data on resonance in 11B at 193 keV, ; deduced reaction rate, astrophysical S-factor. Showed that, with the new reaction rate, a low-mass corecollapse supernovae is unlikely to produce enough 10Be to explain the observed 10Be/9Be ratio in meteorites. Comparison to data from JINA-REACLIB.

doi: 10.1103/PhysRevC.106.015803
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2021LI22      Phys.Rev. C 103, 044613 (2021)

R.Linares, M.Sinha, E.N.Cardozo, V.Guimaraes, G.V.Rogachev, J.Hooker, E.Koshchiy, T.Ahn, C.Hunt, H.Jayatissa, S.Upadhyayula, B.Roeder, A.Saastomoinen, J.Lubian, M.Rodriguez-Gallardo, J.Casal, K.C.C.Pires, M.Assuncao, Y.Penionzhkevich, S.Lukyanov

Elastic scattering measurements for the 10C+ 208Pb system at Elab = 66 MeV

NUCLEAR REACTIONS 208Pb(10C, 10C), E=66 MeV, [10C secondary beam from 1H(10B, 10C), E=9.6 MeV/nucleon primary reaction, followed by selection of 10C beam by the Momentum Achromatic Recoil Spectrometer (MARS) at the K500 superconducting Cyclotron Institute of Texas A and M University]; measured elastically scattered 10C ions, angular distribution of scattered 10C, total σ using ΔE-E telescope of double-sided silicon strip detectors (DSSSDs); deduced suppression of the Fresnel peak. Comparison with optical model, coupled channels, and 3-body and 4-body continuum-discretized coupled-channels (CDCC) calculations using 9B+p, 6Be+α, and 8Be+p+p cluster configurations of 10C with a Brunnian (super-Borromean) structure; analyzed reaction cross sections in literature for the several projectiles on 208Pb target.

doi: 10.1103/PhysRevC.103.044613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2627.


2021RA22      Phys.Rev. C 104, L042801 (2021)

J.S.Randhawa, R.Kanungo, J.Refsgaard, P.Mohr, T.Ahn, M.Alcorta, C.Andreoiu, S.S.Bhattacharjee, B.Davids, G.Christian, A.A.Chen, R.Coleman, P.E.Garrett, G.F.Grinyer, E.G.Fuakye, G.Hackman, J.Hollett, R.Jain, K.Kapoor, R.Krucken, A.Laffoley, A.Lennarz, J.Liang, Z.Meisel, B.Nikhil, A.Psaltis, A.Radich, M.Rocchini, N.Saei, M.Saxena, M.Singh, C.Svensson, P.Subramaniam, A.Talebitaher, S.Upadhyayula, C.Waterfield, J.Williams, M.Williams

First direct measurement of 59Cu(p, α)56Ni: step towards constraining the Ni-Cu cycle in the cosmos

NUCLEAR REACTIONS 1H(59Cu, α)56Ni, E=8.5 MeV/nucleon, [secondary 59Cu beam from Nb(p, X), E=480 MeV at the TRIUMF cyclotron, followed by re-acceleration of 59Cu beam by ISAC-II superconducting LINAC, solid H2 target]; measured protons and α particles, angle-integrated σ using thick single-sided silicon strip detectors and a layer of thick CsI(Tl) detectors; deduced ratio of integrated σ to total σ, exclusive population of the ground state of 56Ni in (p, α). Comparison with Hauser-Feshbach based statistical model calculations; deduced overestimation of (p, α) cross section in this region. Discussed impact on νp process and x-ray bursts (XRBs). Relevance to Ni-Cu cycle in nucleosynthesis, with competing 59Cu(p, α)56Ni and 59Cu(p, γ)60Zn reactions.

doi: 10.1103/PhysRevC.104.L042801
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2696.


2020AH03      Phys.Rev. C 102, 035805 (2020)

T.Ahn, S.Aguilar, R.J.deBoer, D.W.Bardayan, A.Boeltzig, C.R.Brune, S.P.Burcher, K.Y.Chae, S.L.Henderson, R.K.Grzywacz, K.L.Jones, J.M.Kovoor, K.T.Macon, K.Manukyan, S.Mosby, P.D.O'Malley, M.Renaud, K.Smith, C.Thornsberry, B.Vande Kolk, M.Wiescher

Cross-section measurements to low-lying excited final states in the 24Mg(α, p)27Al*(γ) reaction as an energy source for x-ray bursts

NUCLEAR REACTIONS 24Mg(α, p)27Al*, E=4.0-5.4 MeV; measured Eγ, Iγ, γ(θ) for γ rays emitted by resonances in 27Al using an array of 13 LaBr3 detectors from the Hybrid Array of Gamma Ray Detectors (HAGRiD) and enriched target at the ANA accelerator at the University of Notre Dame; deduced yields for resonances in 27Al, integrated angular yields for resonances in 27Al for (α, p1) and (α, p2) channels, astrophysical reaction rates from 1-10 GK. Relevance to energy production in type Ia x-ray bursts. The γ rays also seen from 24Mg(α, a°), 24Mg(α, n)20Ne, and 24Mg(α, γ)28Si.

doi: 10.1103/PhysRevC.102.035805
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2697.


2020BA48      Prog.Part.Nucl.Phys. 114, 103790 (2020)

D.Bazin, T.Ahn, Y.Ayyad, S.Beceiro Novo, A.O.Macchiavelli, W.Mittig, J.S.Randhawa

Low energy nuclear physics with active targets and time projection chambers

NUCLEAR REACTIONS 38S(d, p), E=10 MeV/nucleon; 1H(46Ar, p), (8B, p), 11Li(p, t), 3He(56Ni, 58Cu), 3H(30Mg, p), E not given; analyzed available data; deduced σ(θ), spectroscopic factors, neutron-proton pairing, island of inversions, clusters, B(E2) systematics.

doi: 10.1016/j.ppnp.2020.103790
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2020RA24      Phys.Rev.Lett. 125, 202701 (2020)

J.S.Randhawa, Y.Ayyad, W.Mittig, Z.Meisel, T.Ahn, S.Aguilar, H.Alvarez-Pol, D.W.Bardayan, D.Bazin, S.Beceiro Novo, D.Blankstein, L.Carpenter, M.Cortesi, D.Cortina-Gil, P.Gastis, M.Hall, S.Henderson, J.J.Kolata, T.Mijatovic, F.Ndayisabye, P.O'Malley, J.Pereira, A.Pierre, H.Robert, C.Santamaria, H.Schatz, J.Smith, N.Watwood, J.C.Zamora

First Direct Measurement of 22Mg(α, p)25Al and Implications for X-Ray Burst Model-Observation Comparisons

NUCLEAR REACTIONS 4He(22Mg, p), E ∼ 5 MeV/nucleon; measured reaction products, Ep, Ip; deduced σ, reaction rates. Comparison with Non-Smoker calculations, available data.

doi: 10.1103/PhysRevLett.125.202701
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2019AY03      Phys.Rev.Lett. 123, 082501 (2019)

Y.Ayyad, B.Olaizola, W.Mittig, G.Potel, V.Zelevinsky, M.Horoi, S.Beceiro Novo, M.Alcorta, C.Andreoiu, T.Ahn, M.Anholm, L.Atar, A.Babu, D.Bazin, N.Bernier, S.S.Bhattacharjee, M.Bowry, R.Caballero-Folch, M.Cortesi, C.Dalitz, E.Dunling, A.B.Garnsworthy, M.Holl, B.Kootte, K.G.Leach, J.S.Randhawa, Y.Saito, C.Santamaria, P.Siuryte, C.E.Svensson, R.Umashankar, N.Watwood, D.Yates

Direct Observation of Proton Emission in 11Be

RADIOACTIVITY 11Be(β-p) [from U(p, X), E=480 MeV]; measured decay products, Eβ, Iβ, Ep, Ip; deduced level energy, resonance parameters, J, π. Comparison with available data.

doi: 10.1103/PhysRevLett.123.082501
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2019BU01      Phys.Rev. C 99, 015501 (2019)

D.P.Burdette, M.Brodeur, T.Ahn, J.Allen, D.W.Bardayan, F.D.Becchetti, D.Blankstein, G.Brown, B.Frentz, M.R.Hall, S.King, J.J.Kolata, J.Long, K.T.Macon, A.Nelson, P.D.O'Malley, C.Seymour, M.Skulski, S.Y.Strauss, A.A.Valverde

Resolving the discrepancy in the half-life of 20F

RADIOACTIVITY 20F(β-)[from 2H(19F, p), E=46.0 MeV followed by separation of the radioactive beam using TwinSol]; measured T1/2 of 20F g.s. from β-decay curves using plastic scintillator for β- detection at the University of Notre Dame Nuclear Science Laboratory; deduced recommended average half-life by considering a selection from compiled previous experimental values.

doi: 10.1103/PhysRevC.99.015501
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2019HE11      Phys.Rev. C 99, 064320 (2019)

S.L.Henderson, T.Ahn, M.A.Caprio, P.J.Fasano, A.Simon, W.Tan, P.O'Malley, J.Allen, D.W.Bardayan, D.Blankstein, B.Frentz, M.R.Hall, J.J.Kolata, A.E.McCoy, S.Moylan, C.S.Reingold, S.Y.Strauss, R.O.Torres-Isea

First measurement of the B(E2; 3/2- → 1/2-) transition strength in 7Be: Testing ab initio predictions for A = 7 nuclei

NUCLEAR REACTIONS 197Au(7Be, 7Be'), E=31.3 MeV, [secondary 7Be beam from 2H(6Li, n), E=34.0 MeV primary reaction]; measured reaction products, particle spectra, Eγ, Iγ, (particle)γ-coin using silicon detector for charged particle detection and HPGe detectors for γ detection at the University of Notre Dame FN Tandem Van de Graaff accelerator facility. 7Be; deduced levels, J, π, Coulomb excitation cross section, B(E2) for 3/2- to 1/2- (g.s. to the first excited state) transition. Comparison with ab initio no-core shell model (NCSM) calculations.

doi: 10.1103/PhysRevC.99.064320
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2018BR04      Phys.Lett. B 778, 155 (2018)

J.Bradt, Y.Ayyad, D.Bazin, W.Mittig, T.Ahn, S.Beceiro Novo, B.A.Brown, L.Carpenter, M.Cortesi, M.P.Kuchera, W.G.Lynch, S.Rost, N.Watwood, J.Yurkon, J.Barney, U.Datta, J.Estee, A.Gillibert, J.Manfredi, P.Morfouace, D.Perez-Loureiro, E.Pollacco, J.Sammut, S.Sweany

Study of spectroscopic factors at N = 29 using isobaric analogue resonances in inverse kinematics

NUCLEAR REACTIONS 1H(46Ar, X), E<140 MeV/nucleon; measured reaction products, Ep, Ip. 46,47Ar, 47K; deduced energy levels, J, π, resonance widths. Comparison with R-matrix calculations.

doi: 10.1016/j.physletb.2018.01.015
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2018CH36      Phys.Rev. C 98, 014325 (2018)

J.Chen, C.R.Hoffman, T.Ahn, K.Auranen, M.L.Avila, B.B.Back, D.W.Bardayan, D.Blankstein, P.Copp, D.Gorelov, B.P.Kay, S.A.Kuvin, J.P.Lai, D.G.McNeel, P.D.O'Malley, A.M.Rogers, D.Santiago-Gonzalez, J.P.Schiffer, J.Sethi, R.Talwar, J.R.Winkelbauer

Experimental study of the effective nucleon-nucleon interaction using the 21F(d, p)22F reaction

NUCLEAR REACTIONS 2H(21F, p), E=10 MeV/nucleon, [21F secondary beam from 9Be(22Ne, 21F), E=11 MeV/nucleon primary reaction using ATLAS-ANL facility]; measured Ep, Ip, 22Fe recoils, (22F)p-coin, and σ(θ) using HELIcal Orbit Spectrometer (HELIOS). 22F; deduced levels, J, π, spectroscopic factors and strengths, energy centroids and diagonal particle-hole two-body matrix elements (TBMEs) as function of angular momentum, N=14, 16 shell gaps. Distorted wave Born approximation (DWBA) method for theoretical σ(θ) calculations. Comparison with theoretical spectroscopic strengths by shell-model calculation using the USDA and USDB interactions.

doi: 10.1103/PhysRevC.98.014325
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2353. Data from this article have been entered in the XUNDL database. For more information, click here.


2018GR01      Phys.Rev.Lett. 120, 022502 (2018)

E.Grodner, J.Srebrny, Ch.Droste, L.Prochniak, S.G.Rohozinski, M.Kowalczyk, M.Ionescu-Bujor, C.A.Ur, K.Starosta, T.Ahn, M.Kisielinski, T.Marchlewski, S.Aydin, F.Recchia, G.Georgiev, R.Lozeva, E.Fiori, M.Zielinska, Q.B.Chen, S.Q.Zhang, L.F.Yu, P.W.Zhao, J.Meng

First Measurement of the g Factor in the Chiral Band: The Case of the Cs128 Isomeric State

RADIOACTIVITY 128Cs(IT); measured decay products, Eγ, Iγ; deduced g factor, γ-ray energies, Larmor frequency of precession.

doi: 10.1103/PhysRevLett.120.022502
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2018VA04      Phys.Rev. C 97, 035503 (2018)

A.A.Valverde, M.Brodeur, T.Ahn, J.Allen, D.W.Bardayan, F.D.Becchetti, D.Blankstein, G.Brown, D.P.Burdette, B.Frentz, G.Gilardy, M.R.Hall, S.King, J.J.Kolata, J.Long, K.T.Macon, A.Nelson, P.D.O'Malley, M.Skulski, S.Y.Strauss, B.Vande Kolk

Precision half-life measurement of 11C: The most precise mirror transition Ft value

RADIOACTIVITY 11C(β+), (EC)[from 2H(10B, n), E=32.5 MeV at the Nuclear Science Laboratory of University of Notre Dame, followed by mass separation of 11C ions by TwinSol mass separator and implanted in a thick tantalum foil in NSL β-counting station]; measured Eβ, Iβ, half-life of 11C decay; deduced Ftmirror, Gamow-Teller-to-Fermi mixing ratio ρ, β asymmetry parameter Ab, β-neutrino angular correlation parameter aβν, neutrino asymmetry parameter Bn. Comparison with literature values.

NUCLEAR REACTIONS 2H(10B, n)4He/9Be/10B/11C, E=32.5 MeV; measured yields for ions using TwinSol mass separator at University of Notre Dame.

doi: 10.1103/PhysRevC.97.035503
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2017DU08      Nucl.Phys. A965, 13 (2017)

H.Duckwitz, P.Petkov, T.Thomas, T.Ahn, A.Blazhev, N.Cooper, C.Fransen, M.Hinton, G.Ilie, J.Jolie, V.Werner

Nuclear structure investigations of 84Sr and 86Sr using γ-ray spectroscopic methods

NUCLEAR REACTIONS 85Rb(p, 2n), E=15 MeV;87Rb(p, 2n), E=16 MeV; measured Eγ, Iγ(θ), γγ-coin using HORUS and YRAST spectrometer of 10 clover detectors. 84,86Sr deduced γ transitions, levels, J, π, branching and mixing ratio, T1/2 using DSA (Doppler Shift Attenuation) method; calculated levels, J, π transition strengths, B(E2), B(M1) using NuShellX@MSU shell model code with Honma residual interaction; deduced mixed symmetry states. Calculations compared with available data.

doi: 10.1016/j.nuclphysa.2017.05.077
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2017LO09      Phys.Rev. C 96, 015502 (2017)

J.Long, T.Ahn, J.Allen, D.W.Bardayan, F.D.Becchetti, D.Blankstein, M.Brodeur, D.Burdette, B.Frentz, M.R.Hall, J.M.Kelly, J.J.Kolata, P.D.O'Malley, B.E.Schultz, S.Y.Strauss, A.A.Valverde

Precision half-life measurement of 25Al

RADIOACTIVITY 25Al(EC), (β+)[from 2H(24Mg, n) at the NSL tandem accelerator facility of the University of Notre Dame]; measured Eβ, Iβ, half-life of 25Al decay; deduced world-averaged half-life, Fermi to Gamow-Teller mixing ratio ρ and correlation parameters, and values for various parameters of relevance for determining the Vud term from the 25Al mirror transition. Comparison with previous measurements.

doi: 10.1103/PhysRevC.96.015502
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2016BR01      Phys.Rev. C 93, 025503 (2016)

M.Brodeur, C.Nicoloff, T.Ahn, J.Allen, D.W.Bardayan, F.D.Becchetti, Y.K.Gupta, M.R.Hall, O.Hall, J.Hu, J.M.Kelly, J.J.Kolata, J.Long, P.O'Malley, B.E.Schultz

Precision half-life measurement of 17F

RADIOACTIVITY 17F(β+)[from 2H(16O, X), E not given]; measured β radiation, half-life of 17F decay at the University of Notre Dame β-decay counting station; deduced mixing ratio ρ for the mixed transition between mirror nuclei and the correlation parameters based on Standard Model validity. Discussed uncertainty estimates. Comparison with previous experimental measurements.

NUCLEAR REACTIONS 2H(16O, X)12C/13C/14N/15O/16O/17O/17F, E not given; measured yields of reaction products at Notre Dame TwinSol facility.

doi: 10.1103/PhysRevC.93.025503
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2016FR01      Phys.Rev. C 93, 014321 (2016)

A.Fritsch, S.Beceiro Novo, D.Suzuki, W.Mittig, J.J.Kolata, T.Ahn, D.Bazin, F.D.Becchetti, B.Bucher, Z.Chajecki, X.Fang, M.Febbraro, A.M.Howard, Y.Kanada-En'yo, W.G.Lynch, A.J.Mitchell, M.Ojaruega, A.M.Rogers, A.Shore, T.Suhara, X.D.Tang, R.Torres-Isea, H.Wang

One-dimensionality in atomic nuclei: A candidate for linear-chain α clustering in 14C

NUCLEAR REACTIONS 4He(10Be, α), E=39.7 MeV, [secondary 10Be beam from 13C(11B, 10B), E=46 MeV primary reaction]; measured particle spectra, differential cross sections for elastic and inelastic scattering, angular distributions using the prototype active target-time projection chamber (PAT-TPC) at Notre Dame TwinSol facility. 14C; deduced levels, α-resonances, J, π, band, α-widths, L-transfers, spectroscopic factors. R-matrix analysis. Comparison with predictions of antisymmetrized molecular dynamics (AMD) theory, and evidence for a 3α-linear chain structure in 14C.

doi: 10.1103/PhysRevC.93.014321
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2016TH01      Nucl.Phys. A947, 203 (2016)

T.Thomas, V.Werner, J.Jolie, K.Nomura, T.Ahn, N.Cooper, H.Duckwitz, A.Fitzler, C.Fransen, A.Gade, M.Hinton, G.Ilie, K.Jessen, A.Linnemann, P.Petkov, N.Pietralla, D.Radeck

Nuclear structure of 96, 98Mo: Shape coexistence and mixed-symmetry states

NUCLEAR REACTIONS 96Zr(3He, 3n), E=18 MeV;96Zr(α, 2n), E=16 MeV;measured Eγ, Iγ(θ), γγ-coin using OSIRIS and YRAST Ball spectrometer; deduced γ angular correlations; deduced levels, J, π, branching and E2/M1 mixing ratios, B(M1), B(E2), lifetimes of discrete γ transitions using Doppler Shift Attenuation Method; calculated β, γ deformations using Skyrme energy density functional, IBM-2 configuration mixing; deduced parameters, one- and two-phonon mixed-symmetry states, shape coexistence.

doi: 10.1016/j.nuclphysa.2015.12.010
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2016WE01      Phys.Rev. C 93, 034323 (2016)

V.Werner, N.Cooper, J.-M.Regis, M.Rudigier, E.Williams, J.Jolie, R.B.Cakirli, R.F.Casten, T.Ahn, V.Anagnostatou, Z.Berant, M.Bonett-Matiz, M.Elvers, A.Heinz, G.Ilie, D.Radeck, D.Savran, M.K.Smith

Evolution of collectivity near mid-shell from excited-state lifetime measurements in rare earth nuclei

RADIOACTIVITY 168Ta(EC)[from 159Tb(16O, 7n), E=130 MeV]; 174Re(EC)[from 169Tm(12C, 7n), E=115 MeV]; 152Eu(EC); measured Eγ, γγ-coin, γγ(t) using fast timing system at WNSL-Yale University. 168Hf, 174W; deduced levels, half-lives and B(E2) of first 2+ states. Comparison with previous experimental results. Systematics and analysis in terms of differentials of B(E2) values of the first 2+ states for 162,164,166,168,170,172,174,176,178Hf, 164,166,168,170,172,174,176,178,180W.

doi: 10.1103/PhysRevC.93.034323
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2015HE32      Phys.Rev. C 92, 064317 (2015)

A.Hennig, T.Ahn, V.Anagnostatou, A.Blazhev, N.Cooper, V.Derya, M.Elvers, J.Endres, P.Goddard, A.Heinz, R.O.Hughes, G.Ilie, M.N.Mineva, P.Petkov, S.G.Pickstone, N.Pietralla, D.Radeck, T.J.Ross, D.Savran, M.Spieker, V.Werner, A.Zilges

Collective excitations of 96Ru by means of (p, p'γ) experiments

NUCLEAR REACTIONS 96Ru(p, p'), E=8.4, 7 MeV; measured Ep, Ip, proton angular distributions, Eγ, Iγ, pγ- and γγ-coin, γγ(θ) using YRAST ball spectrometer at WNSL-Yale accelerator facility, level half-lives by DSAM using HORUS γ-ray spectrometer at IKP-Cologne accelerator facility. 96Ru; deduced levels, J, π, multipolarity, mixing ratios, configuration, B(E2), B(M1), B(E1), one-phonon mixed-symmetry excitations of octupole and hexadecapole character, two-phonon mixed-symmetry quintuplet. Comparison with sdg-IBM-2 and shell-model calculations.

NUCLEAR STRUCTURE 96Ru; calculated levels, J, π, B(M1), B(E2) using sdg-IBM-2 and shell-model. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.064317
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2014HE28      Phys.Rev. C 90, 051302 (2014)

A.Hennig, M.Spieker, V.Werner, T.Ahn, V.Anagnostatou, N.Cooper, V.Derya, M.Elvers, J.Endres, P.Goddard, A.Heinz, R.O.Hughes, G.Ilie, M.N.Mineva, P.Petkov, S.G.Pickstone, N.Pietralla, D.Radeck, T.J.Ross, D.Savran, A.Zilges

Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones

NUCLEAR REACTIONS 96Ru(p, p'), E=7.0, 8.4 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin, γγ(θ), level half-life by centroid-shift method using YRAST Ball spectrometer and Si detectors at Yale ESTU Tandem accelerator facility, and HORUS γ-detector array and particle-detector array SONIC at Cologne FN Tandem accelerator facility. 96Ru; deduced levels, J, π, branching ratios, multipole mixing ratios, B(M1), B(E2), mixed-symmetry states (MSS) of octupole and hexadecapole character. Evidence for one-phonon mixed-symmetry character of the second 3(-) and 4+ states. Comparison with sdg-IBM-2 model calculations.

doi: 10.1103/PhysRevC.90.051302
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2014NA15      Phys.Lett. B 728, 303 (2014)

F.Naqvi, V.Werner, P.Petkov, T.Ahn, N.Cooper, G.Ilie, D.Radeck, C.Bernards, M.P.Carpenter, C.J.Chiara, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, D.Seweryniak, Ch.Stoyanov, S.Zhu

Test of the π g7/2 subshell closure at Z = 58

NUCLEAR REACTIONS 24Mg(138Ce, 138Ce'), E=480 MeV; 24Mg(142Ce, 142Ce'), E=494 MeV; measured reaction products, Eγ, Iγ, particle-γ coin. 138,142Ce; deduced g-factors, B(E2) values. Yale plunger device and Gammasphere array.

doi: 10.1016/j.physletb.2013.11.057
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2013GU23      Phys.Rev. C 88, 014301 (2013)

G.Gurdal, E.A.Stefanova, P.Boutachkov, D.A.Torres, G.J.Kumbartzki, N.Benczer-Koller, Y.Y.Sharon, L.Zamick, S.J.Q.Robinson, T.Ahn, V.Anagnostatou, C.Bernards, M.Elvers, A.Heinz, G.Ilie, D.Radeck, D.Savran, V.Werner, E.Williams

Measurements of g(41+, 22+)in 70, 72, 74, 76Ge: Systematics of low-lying structures in 30 ≤ Z ≤ 40 and 30 ≤ N ≤ 50 nuclei

NUCLEAR REACTIONS C, Mg(70Ge, 70Ge'), (72Ge, 72Ge'), (74Ge, 74Ge'), (76Ge, 76Ge'), E=165-225 MeV; measured Eγ, precession angles, angular correlations; deduced g factors. Natural C or Mg targets with mid layer of Gd or Fe and backing of Ta and Cu.

NUCLEAR MOMENTS 70,72,74,76Ge; measured g factors of first and second 2+ and first 4+ states using transient field (TF) technique following Coulomb excitation in inverse kinematics at WNSL-Yale facility. Systematics of g factors for neighboring nuclides of even-even N=32-50, Z=30-38. Comparison with large-scale shell-model, collective models, and IBA-II, and with previous experimental studies. No evidence for shell closure for neutrons at N=38 or N=40.

doi: 10.1103/PhysRevC.88.014301
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2013MC01      Phys.Rev. C 87, 014307 (2013)

E.A.McCutchan, C.J.Lister, T.Ahn, V.Anagnostatou, N.Cooper, M.Elvers, P.Goddard, A.Heinz, G.Ilie, D.Radeck, D.Savran, V.Werner

Shape coexistence and high-K states in 74Se populated following the β decay of 74Br

RADIOACTIVITY 74Br(EC), (β+)[from 60Ni(16O, pn), E=52 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ) using YRAST Ball Clover detectors at WNSL, Yale facility. 74Se; deduced levels, J, π, branching ratios, β strength function, multipolarity, mixing ratio, configuration, B(E2), shape coexistence. Possible K=2 excitation in the second minimum.

doi: 10.1103/PhysRevC.87.014307
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2013SU10      Phys.Rev. C 87, 054301 (2013)

D.Suzuki, A.Shore, W.Mittig, J.J.Kolata, D.Bazin, M.Ford, T.Ahn, F.D.Becchetti, S.Beceiro Novo, D.Ben Ali, B.Bucher, J.Browne, X.Fang, M.Febbraro, A.Fritsch, E.Galyaev, A.M.Howard, N.Keeley, W.G.Lynch, M.Ojaruega, A.L.Roberts, X.D.Tang

Resonant α scattering of 6He: Limits of clustering in 10Be

NUCLEAR REACTIONS 4He(6He, 6He), (6He, 6He'), (6He, 2n)8Be, [secondary 6He beam from 7Li(d, 3He), E=29.2 MeV primary reaction], E=15 MeV; measured reactions products, 6He spectra, elastic and inelastic σ(E, θ) using PAT-TPC system at Notre Dame TwinSol facility. 4,6He, 8Be; deduced levels, cross sections for g.s. and first 2+ states. 10Be; deduced level, resonance, J, π, α width. Discussed α clustering in high-spin states. Comparison with antisymmetric molecular dynamics calculations.

doi: 10.1103/PhysRevC.87.054301
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2013TH09      Phys.Rev. C 88, 044305 (2013)

T.Thomas, K.Nomura, V.Werner, T.Ahn, N.Cooper, H.Duckwitz, M.Hinton, G.Ilie, J.Jolie, P.Petkov, D.Radeck

Evidence for shape coexistence in 98Mo

NUCLEAR REACTIONS 96Zr(α, 2n), E=16 MeV; measured Eγ, γγ-coin, γγ(θ) using YRAST Ball array at WNSL, Yale facility. 98Mo; deduced levels, J, π, mixing ratios, B(E2). Comparison with IBA model calculations. Shape coexistence and configuration mixing.

NUCLEAR STRUCTURE 96,98,100Mo; calculated potential energy surface contours in (β, γ) plane. 98Mo; calculated levels, J, π, B(E2). Comparison with experimental data. 93,95,97,99Mo; observed γ rays.

doi: 10.1103/PhysRevC.88.044305
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2012AH01      Phys.Rev. C 86, 014303 (2012)

T.Ahn, G.Rainovski, N.Pietralla, L.Coquard, T.Moller, A.Costin, R.V.F.Janssens, C.J.Lister, M.P.Carpenter, S.Zhu

Identification of the 21, ms + mixed-symmetry state in 136Ce

NUCLEAR REACTIONS 12C(136Ce, 136Ce'), E=475 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array at ANL facility. Coulomb excitation. 136Ce; deduced levels, J, π, B(M1), B(E2), B(E1), B(E3), identification of one-quadrupole phonon mixed symmetry state (MSS). Systematics of energies of first 2+, and mixed-symmetry 2+ states, B(M1) in N=78 isotones. Discussed fragmentation of the one-phonon MSS of 136Ce.

doi: 10.1103/PhysRevC.86.014303
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2012KU14      Phys.Rev. C 85, 044322 (2012)

G.J.Kumbartzki, K.-H.Speidel, N.Benczer-Koller, D.A.Torres, Y.Y.Sharon, L.Zamick, S.J.Q.Robinson, P.Maier-Komor, T.Ahn, V.Anagnostatou, Ch.Bernards, M.Elvers, P.Goddard, A.Heinz, G.Ilie, D.Radeck, D.Savran, V.Werner, E.Williams

Structure of the Sr-Zr isotopes near and at the magic N=50 shell from g-factor and lifetime measurements in 8840Zr and 84, 86, 3888Sr

NUCLEAR REACTIONS 12C(84Sr, X)84Sr/86Sr/88Sr/88Zr, E=243-285 MeV; measured Eγ, Iγ, (12C)γ-, αγ-, γγ-coin, level half-lives by DSA, g factors. 84,86,88Sr, 88Zr; deduced levels, J, π, B(E2). Systematics of B(E2) values for first 2+ states in even-even N=40-62 Sr and Zr nuclei.

NUCLEAR MOMENTS 88Zr, 84,86,88Sr; measured g factors of 2+ and first 4+ states using transient field technique in inverse kinematics. Comparison with previous studies and with shell model calculations. Systematics of g factors of first 2+ states in even-even N=42-62 Sr and Zr nuclei.

doi: 10.1103/PhysRevC.85.044322
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2012MC05      Phys.Rev. C 86, 057306 (2012)

E.A.McCutchan, C.J.Lister, M.Elvers, D.Savran, J.P.Greene, T.Ahmed, T.Ahn, N.Cooper, A.Heinz, R.O.Hughes, G.Ilie, B.Pauerstein, D.Radeck, N.Shenkov, V.Werner

Precise γ-ray intensity measurements in 10B

NUCLEAR REACTIONS 10B(p, p'), E=10 MeV; measured Eγ, Iγ, proton spectra, pγ-coin, at Yale tandem facility. 10B; deduced levels, γ-ray branching ratios, E2 branch from 5164-keV level, B(E2). Comparison with previous studies.

doi: 10.1103/PhysRevC.86.057306
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2012MO23      Phys.Rev. C 86, 031305 (2012)

T.Moller, N.Pietralla, G.Rainovski, T.Ahn, C.Bauer, M.P.Carpenter, L.Coquard, R.V.F.Janssens, J.Leske, C.J.Lister, E.A.McCutchan, O.Moller, D.Seweryniak, S.Zhu

Absolute β-to-ground band transition strengths in 154Sm

NUCLEAR REACTIONS 12C(154Sm, 154Sm'), E=570 MeV; measured Eγ, Iγ, γγ-coin, γ(θ) in Coulomb excitation using Gammasphere array at ATLAS facility in ANL. 154Sm; deduced levels, J, π, multipolarity, mixing ratio, absolute B(E2), bands, level half-lives. Comparison with confined β-soft rotor model (CBS) and X(5) predictions.

doi: 10.1103/PhysRevC.86.031305
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2012RA03      Phys.Rev. C 85, 014301 (2012)

D.Radeck, V.Werner, G.Ilie, N.Cooper, V.Anagnostatou, T.Ahn, L.Bettermann, R.J.Casperson, R.Chevrier, A.Heinz, J.Jolie, D.McCarthy, M.K.Smith, E.Williams

Simultaneous deorientation and lifetime measurement in 98Ru using the recoil distance Doppler shift method in inverse Coulomb excitation

NUCLEAR REACTIONS 24Mg(98Ru, 98Ru'), E=300 MeV; measured Eγ, Iγ, particle spectra, angular distribution and deorientation, particle-γ coin, half-lives of first 2+ and 4+ states by Recoil distance Doppler shift (RDDS) method using New Yale Plunger Device and YRAST ball array. Coulomb excitation in inverse kinematics. 98Ru; deduced levels, B(E2) values. Comparison with theoretical calculations and previous works, systematics of B(E2) values for first 2+ and 4+ states in A=96-122 (even) Ru, and N=54, Z=40-48 (even) nuclei.

doi: 10.1103/PhysRevC.85.014301
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2012TO01      Phys.Rev. C 85, 017305 (2012)

D.A.Torres, G.J.Kumbartzki, Y.Y.Sharon, L.Zamick, B.Manning, N.Benczer-Koller, K.-H.Speidel, T.Ahn, V.Anagnostatou, M.Elvers, P.Goddard, A.Heinz, G.Ilie, D.Radeck, D.Savran, V.Werner, G.Gurdal, M.J.Taylor, P.Maier-Komor, M.Hjorth-Jensen, S.J.Q.Robinson

Measurement of the 96Ru g(41+) factor and its nuclear structure interpretation

NUCLEAR REACTIONS 12C(96Ru, 96Ru'), E=343, 353 MeV; measured 12C spectra, Eγ, Iγ, (12C)g-coin, (12C)γ(θ), precession angle in transient magnetic field, half-life by DSAM. 96Ru; deduced level, half-life of first 2+, g factors of first 2+ and 4+ states, B(E2). Coulomb excitation in inverse kinematics. Comparison with large-scale shell-model calculations.

NUCLEAR MOMENTS 96Ru; measured g factors of first 2+ and 4+ states by transient magnetic field technique in inverse kinematics.

doi: 10.1103/PhysRevC.85.017305
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2012WE13      J.Phys.:Conf.Ser. 366, 012048 (2012)

V.Werner, G.Ilie, D.Radeck, T.Ahn, C.W.Beausang, L.Bettermann, R.J.Casperson, R.Chevrier, N.Cooper, T.C.Bonniwell, A.Heinz, E.Holland, D.McCarthy, B.Pauerstein, M.K.Smith, J.R.Terry, E.Williams

Lifetime and magnetic moment measurements

NUCLEAR REACTIONS 24Mg(104Pd, 104Pd'), (106Pd, 106Pd'), (108Pd, 108Pd'), E=324, 330, 336 MeV; measured Coulomb excitation Eγ, Iγ using g-Plunger technique; deduced g-factor, T1/2. Compared with NNDC data.

doi: 10.1088/1742-6596/366/1/012048
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2012WO03      Phys.Rev. C 85, 037304 (2012);Erratum Phys.Rev. C 86, 019902 (2012)

A.Wolf, Z.Berant, V.Werner, A.Heinz, R.F.Casten, R.J.Casperson, D.S.Brenner, R.Chevrier, D.McCarthy, G.Ilie, E.Williams, J.Qian, J.R.Terry, T.Ahn, R.Winkler

g factor of the 21+ state of 168Hf

NUCLEAR MOMENTS 168Hf; measured g factor by perturbed angular correlation in a static external magnetic field. Comparisons with hydrodynamic model, semiempirical model, IBA-2 model, large-scale shell-model, pairing plus quadrupole model. Systematics of g factors of first 2+ states for 96,98,100,104,106,108Hf.

RADIOACTIVITY 168Ta(EC), (β+)[from 159Tb(16O, 7n), E=130 MeV]; measured Eγ, γγ-coin, perturbed γγ(θ) in a magnetic field; deduced g factor.

doi: 10.1103/PhysRevC.85.037304
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2011AN04      Acta Phys.Pol. B42, 807 (2011)

V.Anagnostatou, P.H.Regan, M.R.Bunce, D.McCarthy, V.Werner, T.Ahn, R.J.Casperson, R.Chevrier, N.Cooper, A.Heinz, G.Ilie, M.K.Smith, E.Williams, L.Bettermann, D.Radeck, C.W.Beausang, C.Boniwell, B.Pauerstein

Measurements of Picosecond Lifetimes in the Transitional Nucleus 100Pd Using the RDDM in Inverse Kinematics

NUCLEAR REACTIONS 24Mg(80Se, 4n)100Pd, E=268 MeV; measured fusion-evaporation products, Eγ, Iγ; deduced weak deformation, energies, J, π, B(E2), yrast sequence.

doi: 10.5506/APhysPolB.42.807
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2011CO07      Phys.Rev. C 83, 044318 (2011)

L.Coquard, G.Rainovski, N.Pietralla, T.Ahn, L.Bettermann, M.P.Carpenter, R.V.F.Janssens, J.Leske, C.J.Lister, O.Moller, T.Moller, W.Rother, V.Werner, S.Zhu

O(6)-symmetry breaking in the γ -soft nucleus 126Xe and its evolution in the light stable xenon isotopes

NUCLEAR REACTIONS 12C(126Xe, 126Xe'), E=399 MeV; measured Eγ, Iγ, γγ-coin, Coulomb excitation cross sections using Gammasphere array. 126Xe; deduced levels, J, π, bands, B(E2), B(E3) and B(M1) transition strengths, half-lives. Comparison with sd-IBM-1 calculations. O(6)-symmetry breaking and O(5)-symmetry conservation in 124,126,128Xe.

doi: 10.1103/PhysRevC.83.044318
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2011EL09      Phys.Rev. C 84, 054323 (2011)

M.Elvers, S.Pascu, T.Ahmed, T.Ahn, V.Anagnostatou, N.Cooper, C.Deng, J.Endres, P.Goddard, A.Heinz, G.Ilie, E.Jiang, C.Kuppersbusch, D.Radeck, D.Savran, N.Shenkov, V.Werner, A.Zilges

Investigation of octupole vibrational states in 150Nd via inelastic proton scattering (p, p'γ)

NUCLEAR REACTIONS 150Nd(p, p'), E=10.9 MeV; measured Eγ, Iγ, γγ-, pγ-coin using YRAST Ball at Yale. 150Nd; deduced levels, J, π, branching ratios, B(E1) ratios, B(E2) octupole and positive-parity bands. Comparison with interacting boson approximation in sdpf boson space.

doi: 10.1103/PhysRevC.84.054323
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2011KO16      Int.J.Mod.Phys. E20, 520 (2011)

T.Koike, S.Kinoshita, Y.Ma, Y.Miura, K.Shirotori, H.Tamura, M.Ukai, T.Suzuki, T.Endo, M.Fujita, Y.Miyashita, M.Ohguma, N.Sato, T.Shinozuka, M.Tateoka, T.Wakui, A.Yamazaki, T.Fukuchi, J.Timar, P.Joshi, T.Ahn, G.Rainovski, Y.Y.Fu

Chirality in the mass 80 region: 79Kr

NUCLEAR REACTIONS 70Zn(13C, 4n), E=65 MeV; measured reaction products, Eγ, Iγ; deduced level scheme, J, π, bands, energy degeneracy.

doi: 10.1142/S0218301311017946
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2011MC01      Phys.Rev. C 83, 024310 (2011)

E.A.McCutchan, C.J.Lister, T.Ahn, R.J.Casperson, A.Heinz, G.Ilie, J.Qian, E.Williams, R.Winkler, V.Werner

Shape coexistence in 72Se investigated following the β decay of 72Br

RADIOACTIVITY 72Br(β+), (EC)[from 58Ni(16O, pn), E=50 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ) using YRAST array. 72Se; deduced levels, J, π, multipolarity, mixing ratio, β feedings, B(E2) strengths. Comparison with interacting boson model. Evidence of shape coexistence and configuration mixings.

doi: 10.1103/PhysRevC.83.024310
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2011TO09      Phys.Rev. C 84, 044327 (2011)

D.A.Torres, G.J.Kumbartzki, Y.Y.Sharon, L.Zamick, B.Manning, N.Benczer-Koller, G.Gurdal, K.-H.Speidel, M.Hjorth-Jensen, P.Maier-Komor, S.J.Q.Robinson, T.Ahn, V.Anagnostatou, M.Elvers, P.Goddard, A.Heinz, G.Ilie, D.Radeck, D.Savran, V.Werner

First g-factor measurements of the 21+ and the 41+ states of radioactive 100Pd

NUCLEAR REACTIONS 12C(96Ru, 8Be), E=350 MeV; measured particle spectra, Eγ, Iγ, αγ-, γγ-coin, γγ(θ), precession angle. 100Pd; deduced levels, J, π, g factors, B(E2) values.

NUCLEAR MOMENTS 100Pd; measured g-factors of first 2+, 4+ states by transient magnetic field technique in inverse kinematics. Comparison with large-scale shell-model calculations and collective-model predictions.

doi: 10.1103/PhysRevC.84.044327
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2011WE08      J.Phys.:Conf.Ser. 312, 092062 (2011)

V.Werner, N.Cooper, M.Bonett-Matiz, E.Williams, J.-M.Regis, M.Rudigier, T.Ahn, V.Anagnostatou, Z.Berant, M.Bunce, M.Elvers, A.Heinz, G.Ilie, J.Jolie, D.Radeck, D.Savran, M.Smith

Excited State Lifetime Measurements in Rare Earth Nuclei with Fast Electronics

RADIOACTIVITY 174Re(EC) [from 169Tm(12C, 7n)174Re, E=115 MeV]; measured decay products, Eγ, Iγ; deduced lifetimes, B(E2). Comparison with IBA model and systematics.

RADIOACTIVITY 168Ta(EC) [from 159Tb(16O, 7n)168Ta, E=130 MeV]; measured decay products, Eγ, Iγ; deduced lifetimes, B(E2). Comparison with IBA model and systematics.

doi: 10.1088/1742-6596/312/9/092062
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2010CO09      Phys.Rev. C 82, 024317 (2010)

L.Coquard, N.Pietralla, G.Rainovski, T.Ahn, L.Bettermann, M.P.Carpenter, R.V.F.Janssens, J.Leske, C.J.Lister, O.Moller, W.Rother, V.Werner, S.Zhu

Evolution of the mixed-symmetry 21, ms+ quadrupole-phonon excitation from spherical to γ-soft Xe nuclei

NUCLEAR REACTIONS 12C(130Xe, 130Xe'), E=409 MeV; 12C(132Xe, 132Xe'), E=414 MeV; measured Eγ, Iγ, and σ using Gammasphere array. 130Xe, 132Xe; deduced J, π, B(E2), B(M1), and one-phonon mixed symmetry 2+ states. Projectile Coulomb excitation. Systematics of level energies and B(M1) strengths of one-phonon mixed symmetry states in even-even 124-134Xe nuclei.

doi: 10.1103/PhysRevC.82.024317
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2010GU20      Phys.Rev. C 82, 064301 (2010)

G.Gurdal, G.J.Kumbartzki, N.Benczer-Koller, Y.Y.Sharon, L.Zamick, S.J.Q.Robinson, T.Ahn, R.Casperson, A.Heinz, G.Ilie, J.Qian, V.Werner, E.Williams, R.Winkler, D.McCarthey

g factors of the low-lying states in 106Pd: Examination of the vibrational character of 106Pd

NUCLEAR MOMENTS 106Pd; measured g factors and half-lives of low lying 2+ and 4+ states using transient field (TF) technique in inverse kinematics in Coulomb excitation. Comparison with previous measurements and theoretical predictions.

NUCLEAR REACTIONS C(106Pd, C'), E=230, 280, 290, 300 MeV; measured scattered C ions, Eγ, Iγ, γ(θ, H), (12C)γ-coin, level half-lives by line-shape method. 106Pd; deduced g factors, B(E2) values.

doi: 10.1103/PhysRevC.82.064301
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2010RA05      Phys.Lett. B 683, 11 (2010)

G.Rainovski, N.Pietralla, T.Ahn, L.Coquard, C.J.Lister, R.V.F.Janssens, M.P.Carpenter, S.Zhu, L.Bettermann, J.Jolie, W.Rother, R.V.Jolos, V.Werner

How close to the O(6) symmetry is the nucleus 124Xe?

NUCLEAR REACTIONS 12C(124Xe, 124Xe'), E=394 MeV; measured Eγ, Iγ, γγ-coin using DSA technique and the Gammasphere array. 124Xe; deduced levels, J, π, B(E2). Comparison with interacting boson model.

doi: 10.1016/j.physletb.2009.12.007
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2010RA25      J.Phys.:Conf.Ser. 205, 012039 (2010)

G.Rainovski, N.Pietralla, J.Leske, T.Ahn, L.Coquard, C.Bauer, Th.Moler, K.Gladnishki, M.Danchev, A.Damyanova, D.Karagyozov, R.Topchiyska, C.J.Lister, R.V.F.Janssens, M.P.Carpenter, S.Zhu

Experimental studies of proton-neutron mixed symmetry states in the mass A ≈ 130 region

doi: 10.1088/1742-6596/205/1/012039
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2009AH01      Phys.Lett. B 679, 19 (2009); Erratum Phys.Lett. B 682, 490 (2010)

T.Ahn, L.Coquard, N.Pietralla, G.Rainovski, A.Costin, R.V.F.Janssens, C.J.Lister, M.Carpenter, S.Zhu, K.Heyde

Evolution of the one-phonon 21, ms mixed-symmetry state in N=80 isotones as a local measure for the proton-neutron quadrupole interaction

NUCLEAR REACTIONS 12C(134Xe, 134Xe'), E=435 MeV; measured Eγ, Iγ, γγ-coin using DSA technique and the Gammasphere array. 134Xe; deduced levels, J, π, δ, B(E2), B(M1), related properties. Systematics of N=80, 82 isotones discussed.

doi: 10.1016/j.physletb.2009.06.066
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2009BE11      Phys.Rev. C 79, 034315 (2009)

L.Bettermann, C.Fransen, S.Heinze, J.Jolie, A.Linnemann, D.Mucher, W.Rother, T.Ahn, A.Costin, N.Pietralla, Y.Luo

Candidates for the one-phonon mixed-symmetry state in 130Xe

RADIOACTIVITY 130Cs(EC), (β+)[from 126Te(7Li, 3n), E=30 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ), mixing ratios. 130Xe; deduced levels, J, π, multipolarity. Comparison with shell-model and interacting-boson model-2 calculations.

doi: 10.1103/PhysRevC.79.034315
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2009BE42      Phys.Rev. C 80, 057303 (2009)

Z.Berant, E.Oster, R.J.Casperson, A.Wolf, V.Werner, A.Heinz, R.F.Casten, G.Gurdal, E.A.McCutchan, D.S.Brenner, J.R.Terry, R.Winkler, E.Williams, J.Qian, A.Schmidt, M.K.Smith, T.Ahn, C.W.Beausang, P.H.Regan, T.Ross, M.Bunce, B.Darakchieva, D.A.Meyer, J.LeBlanc, K.Dudziak, C.Bauer, G.Henning

g factor of the 2+1 state of 172Hf

NUCLEAR MOMENTS 172Hf; measured g factor of first 2+ state using integral perturbed angular correlation method. Comparisons with g factors of neighboring even-even Hf nuclei and with predictions of several nuclear models including interacting boson approximation (IBA-2).

RADIOACTIVITY 172Ta(EC), (β+) [from 165Ho(12C, 5n), E=85 MeV]; measured Eγ, Iγ, γγ-coin, and cascade Iγ as a function of angle and magnetic field.

doi: 10.1103/PhysRevC.80.057303
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2009CO24      Phys.Rev. C 80, 061304 (2009)

L.Coquard, N.Pietralla, T.Ahn, G.Rainovski, L.Bettermann, M.P.Carpenter, R.V.F.Janssens, J.Leske, C.J.Lister, O.Moller, W.Rother, V.Werner, S.Zhu

Robust test of E(5) symmetry in 128Xe

NUCLEAR REACTIONS 12C(128Xe, 128Xe'), E=404 MeV; measured Eγ, Iγ, γγ-coin, and γ-ray yields in Coulomb excitation using Gammasphere array. 128Xe; deduced levels, J, π, B(E2), and B(E2) ratios. Tested validity of E(5) symmetry.

doi: 10.1103/PhysRevC.80.061304
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2009PI14      Phys.Lett. B 681, 134 (2009)

N.Pietralla, T.C.Li, M.Fritzsche, M.W.Ahmed, T.Ahn, A.Costin, J.Enders, J.Li, S.Muller, P.von Neumann-Cosel, I.V.Pinayev, V.Yu.Ponomarev, D.Savran, A.P.Tonchev, W.Tornow, H.R.Weller, V.Werner, Y.K.Wu, A.Zilges

Competition between excited core states and 1hω single-particle excitations at comparable energies in 207Pb from photon scattering

NUCLEAR REACTIONS 208Pb(polarized γ, γ'), E=5.5, 5.6 MeV; measured Eγ, Iγ using the azimuthal nuclear resonance fluorescence intensity asymmetry technique. 206,207,208Pb; deduced levels, J, π.

doi: 10.1016/j.physletb.2009.09.059
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2008SP01      Phys.Lett. B 659, 101 (2008)

K.-H.Speidel, S.Schielke, J.Leske, N.Pietralla, T.Ahn, A.Costin, M.v.Schmid, O.Zell, J.Gerber, P.Maier-Komor, S.J.Q.Robinson, A.Escuderos, Y.Y.Sharon, L.Zamick

First g-factor measurements on semi-magic 36S and their implications for the rigidity of the N = 20 shell closure

NUCLEAR REACTIONS 12C(36S, 36S'), (36S, 40Ar), E=70 MeV; measured Eγ, Iγ, T1/2 using transient field technique and DSA; 36S, 40Ar; deduced B(E2), g-factor. Comparison with shell model and previous results.

doi: 10.1016/j.physletb.2007.11.049
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2008SP04      Phys.Rev. C 78, 017304 (2008)

K.-H.Speidel, S.Schielke, J.Leske, N.Pietralla, T.Ahn, A.Costin, O.Zell, J.Gerber, P.Maier-Komor, S.J.Q.Robinson, A.Escuderos, Y.Y.Sharon, L.Zamick

New shell model calculations for 40Ar based on recent g-factor and lifetime measurements

NUCLEAR REACTIONS 12C(36S, 40Ar), E=70 MeV; measured Eγ, Iγ, particle spectra, γγ-coin, (particle)γ-coin, g-factors, B(E2). 40Ar; measured half-lives of 2+ and 4+ states using Doppler-shift attenuation method; deduced levels, J, π.

doi: 10.1103/PhysRevC.78.017304
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2008SU18      Phys.Rev. C 78, 031302 (2008)

T.Suzuki, G.Rainovski, T.Koike, T.Ahn, M.P.Carpenter, A.Costin, M.Danchev, A.Dewald, R.V.F.Janssens, P.Joshi, C.J.Lister, O.Moller, N.Pietralla, T.Shinozuka, J.Timar, R.Wadsworth, C.Vaman, S.Zhu

Lifetime measurement of candidate chiral doublet bands in the 103, 104Rh isotopes with the recoil-distance Doppler-shift method in inverse kinematics

NUCLEAR REACTIONS 11B(96Zr, 4n), (96Zr, 3n), E=330 MeV; measured Eγ, Iγ, γγ-coin, half-lives using recoil-distance doppler shift method. 103,104Rh; deduced levels, J, π, configurations, B(M1), B(E2).

doi: 10.1103/PhysRevC.78.031302
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2007AH02      Phys.Rev. C 75, 014313 (2007)

T.Ahn, N.Pietralla, G.Rainovski, A.Costin, K.Dusling, T.C.Li, A.Linnemann, S.Pontillo

γ-ray multipolarimetry between low-spin states of 136Ce: Search for the 2+1, ms one-phonon mixed-symmetry state

RADIOACTIVITY 136Pr(EC), (β+) [from 134Ba(6Li, 4n)]; measured Eγ, Iγ, γγ-coin. 136Ce deduced levels, J, π, δ, B(E2)/B(M1), possible mixed-symmetry state.

doi: 10.1103/PhysRevC.75.014313
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2007PI13      Nucl.Phys. A788, 85c (2007)

N.Pietralla, G.Rainovski, T.Ahn, A.Costin

Isovector Quadrupole Excitations in the Valence Shell studied in Projectile Coulomb Excitation

NUCLEAR REACTIONS 12C(138Ce, 138Ce'), E=480 MeV; measured Eγ, Iγ, angular distributions following projectile Coulomb excitation. 138Ce deduced levels, J, π, B(M1), B(E2), matrix elements, δ, mixed-symmetry state. Gammasphere array.

doi: 10.1016/j.nuclphysa.2007.01.052
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2007TI07      Phys.Rev. C 76, 024307 (2007)

J.Timar, T.Koike, N.Pietralla, G.Rainovski, D.Sohler, T.Ahn, G.Berek, A.Costin, K.Dusling, T.C.Li, E.S.Paul, K.Starosta, C.Vaman

High-spin structure of 105Ag: Search for chiral doublet bands

NUCLEAR REACTIONS 100Mo(10B, 5n), E=58, 64 MeV; measured Eγ, Iγ, γγ-coinc. 105Ag deduced levels, J, π, multipolarities.

doi: 10.1103/PhysRevC.76.024307
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2006CO20      Phys.Rev.C 74, 067301 (2006)

A.Costin, T.Ahn, B.Bochev, K.Dusling, T.C.Li, N.Pietralla, G.Rainovski, W.Rother

Lifetime measurement for the 21+ state of 170Hf

NUCLEAR REACTIONS 158Gd(16O, 4n), E=80 MeV; measured prompt and delayed Eγ, Iγ. 170Hf levels deduced T1/2, B(E2). Pulsed beam, level systematics in neighboring nuclides discussed.

doi: 10.1103/PhysRevC.74.067301
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2006DU02      Phys.Rev. C 73, 014317 (2006)

K.Dusling, N.Pietralla, G.Rainovski, T.Ahn, B.Bochev, A.Costin, T.Koike, T.C.Li, A.Linnemann, S.Pontillo, C.Vaman

Medium-spin γ-ray spectroscopy of the transitional nucleus 160Er

NUCLEAR REACTIONS 159Tb(6Li, 5n), E=52 MeV; measured Eγ, Iγ, γγ-coin. 160Er deduced levels, J, π, δ, branching ratios, collective features. Constrained β-soft rotor model analysis.

doi: 10.1103/PhysRevC.73.014317
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2006LI23      Phys.Rev. C 73, 054306 (2006)

T.C.Li, N.Pietralla, A.P.Tonchev, M.W.Ahmed, T.Ahn, C.Angell, M.A.Blackston, A.Costin, K.J.Keeter, J.Li, A.Lisetskiy, S.Mikhailov, Y.Parpottas, B.A.Perdue, G.Rainovski, W.Tornow, H.R.Weller, Y.K.Wu

First evidence for spin-flip M1 strength in 40Ar

NUCLEAR REACTIONS 40Ar(polarized γ, γ'), E=7.7-11 MeV; measured Eγ, Iγ, asymmetry. 40Ar deduced levels, J, π, excitation B(E1), B(M1), spin-flip M1 strength. Comparison with shell model predictions.

doi: 10.1103/PhysRevC.73.054306
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2006RA08      Phys.Rev.Lett. 96, 122501 (2006)

G.Rainovski, N.Pietralla, T.Ahn, C.J.Lister, R.V.F.Janssens, M.P.Carpenter, S.Zhu, C.J.Barton III

Stabilization of Nuclear Isovector Valence-Shell Excitations

NUCLEAR REACTIONS 12C(138Ce, 138Ce'), E=480 MeV; measured Eγ, Iγ, angular distributions following projectile Coulomb excitation. 138Ce deduced levels, J, π, B(M1), B(E2), B(E3), δ, mixed-symmetry state. Gammasphere array.

doi: 10.1103/PhysRevLett.96.122501
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2005CO22      Phys.Rev. C 72, 054305 (2005)

A.Costin, N.Pietralla, T.Koike, C.Vaman, T.Ahn, G.Rainovski

Subnanosecond lifetime measurement for the T = 0, 31+ state of odd-odd N = Z 58Cu

NUCLEAR REACTIONS 58Ni(p, p'γ), (p, nγ), E=14 MeV; measured prompt and delayed Eγ, Iγ. 58Cu level deduced T1/2, B(E2), collective features. Comparison with model predictions.

doi: 10.1103/PhysRevC.72.054305
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2003RO09      Phys.Rev. C 67, 057301 (2003)

S.P.Roberts, T.Ahn, K.Starosta, T.Koike, C.J.Chiara, C.Vaman

Low-spin studies of the πh11/2νh11/2 structure in 134Pr

NUCLEAR REACTIONS 119Sn(19F, 4n), E=76 MeV; measured prompt and delayed Eγ, Iγ, γγ-coin. 134Pr deduced levels, J, π, ICC, isomeric state T1/2.

doi: 10.1103/PhysRevC.67.057301
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