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NSR database version of April 27, 2024.

Search: Author = D.E.Ward

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2019KH04      Phys.Rev. C 99, 054306 (2019)

J.Khuyagbaatar, A.Yakushev, Ch.E.Dullmann, D.Ackermann, L.-L.Andersson, M.Asai, M.Block, R.A.Boll, H.Brand, D.M.Cox, M.Dasgupta, X.Derkx, A.Di Nitto, K.Eberhardt, J.Even, M.Evers, C.Fahlander, U.Forsberg, J.M.Gates, N.Gharibyan, P.Golubev, K.E.Gregorich, J.H.Hamilton, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.J.Hinde, J.Hoffmann, R.Hollinger, A.Hubner, E.Jager, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, M.Laatiaoui, S.Lahiri, R.Lang, B.Lommel, M.Maiti, K.Miernik, S.Minami, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, G.K.Pang, P.Papadakis, D.Renisch, J.Roberto, D.Rudolph, J.Runke, K.P.Rykaczewski, L.G.Sarmiento, M.Schadel, B.Schausten, A.Semchenkov, D.A.Shaughnessy, P.Steinegger, J.Steiner, E.E.Tereshatov, P.Thorle-Pospiech, K.Tinschert, T.Torres De Heidenreich, N.Trautmann, A.Turler, J.Uusitalo, D.E.Ward, M.Wegrzecki, N.Wiehl, S.M.Van Cleve, V.Yakusheva

Fusion reaction ⁴⁸Ca + ²⁴⁹Bk leading to formation of the element Ts (Z=117)

NUCLEAR REACTIONS ²⁴⁹Bk(⁴⁸Ca, 3n), (⁴⁸Ca, 4n)²⁹³Ts/²⁹⁴Ts, E=252.1, 254.0, 258.0 MeV; measured reaction products, evaporation residues (ER), Eα, Iα, (ER)α-correlated decay chains, and σ using double-sided silicon strip detectors for α detection, TASCA separator for evaporation residue, and multiwire proportional counter for detection of residues at UNILAC accelerator facility of GSI. Comparison with previous experimental data for (ER)α-correlated decay chains from DGFRS-Dubna facility.

RADIOACTIVITY ²⁹⁴Ts, ²⁹⁰Mc, ²⁸⁶Nh, ²⁸²Rg, ²⁷⁸Mt, ²⁷⁴Bh, ²⁷⁰Db(α); ²⁹³Ts, ²⁸⁹Mc, ²⁸⁵Nh, ²⁸¹Rg(α); ²⁶⁶Lr, ²⁷⁰Db, ²⁷⁷Mt, ²⁷⁷Hs(SF); measured Eα, Iα, SF events, half-lives. ²⁶⁶Lr, ²⁷⁰Db(α), (SF); measured half-lives and α/SF branching ratios. Comparison with previous experimental data for (ER)α-correlated decay chains from DGFRS-Dubna facility. A=200-240; A=240-260; systematics of α-decay half-lives of isotopes produced in ⁴⁸Ca+²⁴⁹Bk and ⁴⁸Ca+²⁴⁹Cf reactions.

doi: 10.1103/PhysRevC.99.054306
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2019WA27      Phys.Rev. C 100, 034301 (2019)

D.E.Ward, B.G.Carlsson, P.Moller, S.AAberg

Global microscopic calculations of odd-odd nuclei

NUCLEAR STRUCTURE Z=8-100, N=8-156; calculated ground-state Jπ for odd-A nuclei from the lowest-energy proton or neutron quasiparticle. ^158,160Tb, ^164,166Ho, ^168,170Tm, ^174,176Lu, ¹⁸²Ta, ^186,188Re, ^234,236Pa, ²³⁸Np, ^240,242,244Cm, ²⁵⁰Bk; calculated excitation energies of the 2-qp bandheads, bandhead splittings in rare-earth nuclei and actinides using Folded-Yukawa quasiparticles-plus-rotor model with three different residual interactions. ⁵⁰Sc, ⁹⁰Y, ^208,210Bi; calculated low-lying multiplets in the spherical nuclei. ^174,176Lu, ^180,182Ta; calculated low-lying rotational bands and K=0 bands. ^{248,250,252,254,256}Es, ²⁵⁶Md; predicted ground-state spins of superheavy nuclei. Z=101-119, N=138-182; calculated Q(α) values for odd-odd superheavy nuclei. Macroscopic-microscopic finite-range droplet model combined with particle-rotor coupling model order to describe low-energy spectra of odd-odd nuclei, using different interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.100.034301
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2017LO13      Phys.Rev. C 96, 034315 (2017)

Ch.Lorenz, L.G.Sarmiento, D.Rudolph, D.E.Ward, M.Block, F.P.Hessberger, D.Ackermann, L.-L.Andersson, M.L.Cortes, C.Droese, M.Dworschak, M.Eibach, U.Forsberg, P.Golubev, R.Hoischen, I.Kojouharov, J.Khuyagbaatar, D.Nesterenko, I.Ragnarsson, H.Schaffner, L.Schweikhard, S.Stolze, J.Wenzl

Quantum-state-selective decay spectroscopy of ²¹³Ra

RADIOACTIVITY ²¹³Ra(α), (EC), (β⁺)[from ¹⁷⁰Er(⁴⁸Ca, 5n), E=4.30 MeV/nucleon using velocity filter SHIP and SHIPTRAP Penning trap at GSI UNILAC facility]; ²⁰⁹Rn(α), (EC), (β⁺)[from ²¹³Ra α decay]; ²¹³Fr(α), (EC), (β⁺)[from ²¹³Ra EC decay]; ²⁰⁹At(α), (EC), (β⁺)[from ²⁰⁹Rn EC decay]; measured Eα, Iα, Eγ, Iγ, αγ-coin, (x ray)α-coin, α and EC+β⁺ branching ratios using TASISpec setup at GSI. GEANT4 simulations. ²⁰⁹Rn; deduced levels, α feedings, γ-ray branching ratios, multipolarity. Comparison with evaluated data, and Nilsson-Strutinsky and shell-model calculations. ²⁰⁹Rn; calculated levels, J, π using shell model with pbpop interaction, total energy surface in (ϵ₂, ϵ₄) plane, and compared with experimental data, and other theoretical calculations.

doi: 10.1103/PhysRevC.96.034315
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2017WA08      Phys.Rev. C 95, 024618 (2017)

D.E.Ward, B.G.Carlsson, T.Dossing, P.Moller, J.Randrup, S.AAberg

Nuclear shape evolution based on microscopic level densities

NUCLEAR REACTIONS ²²⁶Th, ^234,236U, ²⁴⁰Pu(γ, F), (n, F), E(n)=thermal; calculated yield of fragments as function of proton number and angular momentum and excitation energy using parameter-free microscopic level densities obtained with the Metropolis-walk method. Comparison with experimental data.

NUCLEAR STRUCTURE ²³⁶U; calculated microscopic level density as a function of angular momentum and excitation energy, potential-energy curves and mass asymmetry versus elongation using Metropolis walk, combinatorial method.

doi: 10.1103/PhysRevC.95.024618
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2016FO10      Nucl.Phys. A953, 117 (2016)

U.Forsberg, D.Rudolph, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, C.Fahlander, J.M.Gates, P.Golubev, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, L.G.Sarmiento, M.Schadel, A.Yakushev, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, J.Dobaczewski, K.Eberhardt, J.Even, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, W.Nazarewicz, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, Y.Shi, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Recoil-α-fission and recoil-α-α- fission events observed in the reaction ⁴⁸Ca + ²⁴³Am

NUCLEAR REACTIONS ²⁴³Am(⁴⁸Ca, x), E=242.1, 245.0 MeV; measured reaction products, fission products, Eα, Iα(t), αα-coin, (recoil)α-coin, En, In using He-gas filled TASCA, TASISpec based on DSSSDs, other DSSSDs; deduced correlation times, α energy spectra, 23 α-decay chains of five α's and α+3n, fragments T_1/2. Discussed existence of long decay chains; compared with published results.

RADIOACTIVITY ^289,288Mc, ²⁸⁴Nh, ²⁸⁰Rg, ²⁷⁶Mt, ²⁷²Bh(α), ²⁶⁸Db(SF); measured decay products, Eα, Iα; deduced T_1/2. Comparison with available data.

doi: 10.1016/j.nuclphysa.2016.04.025
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2015RU11      J.Radioanal.Nucl.Chem. 303, 1185 (2015)

D.Rudolph, U.Forsberg, P.Golubev, L.G.Sarmiento, A.Yakushev, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, J.M.Gates, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, M.Schadel, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, K.Eberhardt, J.Even, C.Fahlander, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Selected spectroscopic results on element 115 decay chains

RADIOACTIVITY ²⁸⁸Mc, ²⁸⁴Nh, ²⁸⁰Rg, ²⁷⁶Mt, ²⁷²Bh(α), ²⁶⁸Db(SF); measured decay products, Eα, Iα; deduced Q-values, level energies, branching ratios. Comparison with GEANT4 Monte-Carlo simulations.

doi: 10.1007/s10967-014-3445-y
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2015WA20      Phys.Rev. C 92, 014314 (2015)

D.E.Ward, B.G.Carlsson, S.AAberg

α-decay spectra of odd nuclei using the effective Skyrme interaction

RADIOACTIVITY ¹⁴⁵Pm, ¹⁴⁷Sm, ¹⁴⁷Eu, ^149,149mTb, ^{187,189,191,193,195,197,199,201,201m,203,205,207,209,211,213,215,217}Po, ^{203,205,207,209,211,213}At, ^207,209,211Rn, ^{207,209,211,213}Fr, ²¹³Ra(α); analyzed experimental data for partial half-lives and reduced widths, compared with calculated microscopic reduced widths using SLy4 and surface pairing. ^{279,281,283,285,287,289,291,293}Bh, ^{281,283,285,287,289,291,293}Hs, ^{281,283,285,287,289,291,293,295}Mt, ^{283,285,287,289,291,293,295}Ds, ^{283,285,287,289,291,293,295,297}Rg, ^{285,287,289,291,293,295,297,299}Cn, ^{285,287,289,291,293,295,297,299}Nh, ^{287,289,291,293,295,297,299,301}Fl, ^{287,289,291,293,295,297,299,301}Mc, ^{289,291,293,295,297,299,301,303}Lv, ^{289,291,293,295,297,299,301,303}Ts, ^{291,293,295,297,299,301,303,305}Og, ^{291,293,295,297,299,301,303,305}119, ^{293,295,297,299,301,303,305,307}120, ^{280,282,284,286,288,290,292,294}Hs, ^{282,284,286,288,290,292,294,296}Ds, ^{284,286,288,290,292,294,296,298}Cn, ^{286,288,290,292,294,296,298,300}Fl, ^{288,290,292,294,296,298,300,302}Lv, ^{290,292,294,296,298,300,302,304}Og, ^{292,294,296,298,300,302,304,306}120(α); calculated Q(α) values, half-lives and reduced widths for superheavy odd-A and even-even nuclei using axially deformed Skyrme-HFB. R-matrix-type microscopic formalism for the calculation of the decay rate, using HFB wave functions obtained with SLy4 Skyrme effective interaction.

NUCLEAR STRUCTURE ²⁰⁸Pb, ²⁹⁸Fl; calculated HF single-particle energies for ²⁰⁸Pb and Nilsson diagrams for neutron and proton levels using SLy4.

doi: 10.1103/PhysRevC.92.014314
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2014KH04      Phys.Rev.Lett. 112, 172501 (2014)

J.Khuyagbaatar, A.Yakushev, C.E.Dullmann, D.Ackermann, L.-L.Andersson, M.Asai, M.Block, R.A.Boll, H.Brand, D.M.Cox, M.Dasgupta, X.Derkx, A.Di Nitto, K.Eberhardt, J.Even, M.Evers, C.Fahlander, U.Forsberg, J.M.Gates, N.Gharibyan, P.Golubev, K.E.Gregorich, J.H.Hamilton, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.J.Hinde, J.Hoffmann, R.Hollinger, A.Hubner, E.Jager, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, M.Laatiaoui, S.Lahiri, R.Lang, B.Lommel, M.Maiti, K.Miernik, S.Minami, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, G.K.Pang, P.Papadakis, D.Renisch, J.Roberto, D.Rudolph, J.Runke, K.P.Rykaczewski, L.G.Sarmiento, M.Schadel, B.Schausten, A.Semchenkov, D.A.Shaughnessy, P.Steinegger, J.Steiner, E.E.Tereshatov, P.Thorle-Pospiech, K.Tinschert, T.Torres De Heidenreich, N.Trautmann, A.Turler, J.Uusitalo, D.E.Ward, M.Wegrzecki, N.Wiehl, S.M.Van Cleve, V.Yakusheva

⁴⁸Ca + ²⁴⁹Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying ²⁷⁰Db and Discovery of ²⁶⁶Lr

NUCLEAR REACTIONS ²⁴⁹Bk(⁴⁸Ca, X)²⁹⁴Ts, E=268.3, 270.2, 274.1 MeV; measured reaction products, Eα, Iα; deduced σ. Comparison with experimental data.

RADIOACTIVITY ²⁹⁴Ts, ²⁹⁰Mc, ²⁸⁶Nh, ²⁸²Rg, ²⁷⁸Mt, ²⁷⁴Bh, ²⁷⁰Db, ²⁶⁶Lr(α); measured decay products, Eα, Iα; deduced T_1/2. Comparison with experimental data.

doi: 10.1103/PhysRevLett.112.172501
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2014RU04      Acta Phys.Pol. B45, 263 (2014)

D.Rudolph, U.Forsberg, P.Golubev, L.G.Sarmiento, A.Yakushev, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, J.M.Gates, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, M.Schadel, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, K.Eberhardt, J.Even, C.Fahlander, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains

RADIOACTIVITY ^287,288Mc, ^283,284Nh, ^279,280Rg, ^275,276Mt, ^271,272Bh(α), ^267,268Db(SF) [from ²⁴³Am(⁴⁸Ca, X), E not given]; measured decay products, Eα, Iα, Eγ, Iγ, X-rays; deduced T_1/2, correlated α-decay chains. Comparison with available data.

doi: 10.5506/APhysPolB.45.263
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2014SH15      Phys.Rev. C 90, 014308 (2014)

Y.Shi, D.E.Ward, B.G.Carlsson, J.Dobaczewski, W.Nazarewicz, I.Ragnarsson, D.Rudolph

Structure of superheavy nuclei along decay chains of element 115

NUCLEAR STRUCTURE ²⁶⁴Rf, ²⁶⁸Sg, ²⁷²Hs, ²⁷⁶Ds, ²⁸⁰Cn, ²⁸⁴Fl, ²⁸⁸Lv, ²⁹²Og, ²⁹⁶120; calculated quadrupole moments. ²⁹³Ts, ^287,289Mc, ^283,285Nh, ^279,281Rg, ^287,289Lv, ^283,285Fl, ^279,281Cn, ^275,277Ds, ^275,277Mt, ^273,275Hs, ^271,272,273Bh, ²⁷¹Sg; calculated level energies for various Nilsson configurations, total quadrupole moments, quadrupole mass deformations β₂ for one-quasiparticle excitations in nuclei associated with α-decay chains of ^287,289Lv, ²⁸⁷Mc, ²⁹³Ts and some neighboring nuclei. Self-consistent Skyrme Hartree-Fock-Bogolyubov (SHFB), energy density functional approach (using UNEDF1 and UNEDF1^SO) and macroscopic-microscopic Nilsson model for superheavy nuclei. Discussed E1 transitions.

doi: 10.1103/PhysRevC.90.014308
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2014WA55      Phys.Scr. 89, 054027 (2014)

D.E.Ward, B.G.Carlsson, S.Aberg

Alpha-particle formation and decay rates from Skyrme-HFB wave functions

RADIOACTIVITY ²¹²Po(α); calculated α-particle formation amplitude, α-decay width using R-matrix with HFB wavefunctions with Skyrme interactions. Decay width compared to data.

doi: 10.1088/0031-8949/89/5/054027
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2013RU11      Phys.Rev.Lett. 111, 112502 (2013)

D.Rudolph, U.Forsberg, P.Golubev, L.G.Sarmiento, A.Yakushev, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, J.M.Gates, K.E.Gregorich, C.J.Gross, F.P.Hessberger, R.-D.Herzberg, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, M.Schadel, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, K.Eberhardt, J.Even, C.Fahlander, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Spectroscopy of Element 115 Decay Chains

RADIOACTIVITY ²⁸⁸Mc, ²⁸⁴Nh, ²⁸⁰Rg, ²⁷⁶Mt, ²⁷²Bh(α) [from ²⁴³Am(⁴⁸Ca, X), E=5.4 MeV/nucleon]; measured decay products, Eα, Iα, Eγ, Iγ, X-rays. ²⁸⁰Rg, ²⁷⁶Mt; deduced T_1/2, Q-value, α-decay scheme. Comparison with Monte Carlo calculations.

doi: 10.1103/PhysRevLett.111.112502
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2013WA30      Phys.Rev. C 88, 064316 (2013)

D.E.Ward, B.G.Carlsson, S.AAberg

α-decay calculations of heavy nuclei using an effective Skyrme interaction

NUCLEAR STRUCTURE ²⁰⁸Pb; calculated neutron and proton densities by solving the HFB equations using a spherical oscillator basis.

RADIOACTIVITY ²¹⁰Pb, ^210,212Po(α); calculated decay widths for different sizes of the oscillator basis, and three different Skyrme forces, effect on decay rate with the Lipkin-Nogami (LN) procedure, HFB+LN and HFB approaches density dependence of pairing forces. ^{194,196,198,200,202,204,206,208,210,212,214,216,218}Po, ^{202,204,206,208,210,212,214,216,218}Rn, ^{206,208,210,212,214,216,218}Ra, ¹⁴⁴Nd, ¹⁴⁶Sm, ¹⁴⁸Gd, ¹⁵⁰Dy, ^152,154Er, ^154,156Yb, ^156,158Hf, ^158,160W, ¹⁶²Os, ^{294,296,298,300}Fl, ^{294,296,298,300}Fl, ^{306,308,310,312}126(α); calculated α decay widths, half-lives of Fl and Z=126 isotopes. Nuclear ground states calculated with the Hartree-Fock-Bogoliubov (HFB) method with Skyrme interaction. Microscopic α-decay formation amplitudes calculated from HFB wave functions, and α widths with R-matrix formalism. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.064316
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