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NSR database version of April 11, 2024.

Search: Author = T.A.Werke

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2022WE04      Phys.Rev. C 106, 054615 (2022)

T.A.Werke, C.S.Salas, K.J.Glennon, D.A.Mayorov, E.E.Tereshatov, M.F.Volia, D.M.Wright, C.M.Folden, III

Measurement of fusion-evaporation cross sections for reactions of 44Ca with 154, 156, 157, 160Gd targets

NUCLEAR REACTIONS 154,156,157,160Gd(44Ca, X), (44Ca, 3n), (44Ca, 4n), (44Ca, 5n), (44Ca, 6n), (44Ca, 7n), (44Ca, 8n), E=214.3, 229.7 MeV; measured reaction products, evaporation residues, Eα, Iα, (fragment)α-coin; deduced total σ, evaporation residues σ. Comparison to theoretical calculations. Observed that collective enhancement to level density (CELD) applied in the calculations has a significant impact on the production of the spherical evaporation residues. Momentum Achromat Recoil Spectrometer (MARS) at K500 superconducting cyclotron of Cyclotron Institute at Texas A

RADIOACTIVITY 194,195,195m,196,197,197m,198,199mPo(α)[from 154,156,157,160Gd(44Ca, X)]; measured Eα, Iα, (fragment)α-coin deduced T1/2. Comparison to previous experimental results. Momentum Achromat Recoil Spectrometer (MARS) at K500 superconducting cyclotron of Cyclotron Institute at Texas A

doi: 10.1103/PhysRevC.106.054615
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2018NI14      Phys.Rev. C 98, 054321 (2018)

N.Nica, J.C.Hardy, V.E.Iacob, V.Horvat, H.I.Park, T.A.Werke, K.J.Glennon, C.M.Folden, V.I.Sabla, J.B.Bryant, X.K.James, M.B.Trzhaskovskaya

Precise measurement of αK andαT for the 39.8-keV E3 transition in 103Rh: Test of internal-conversion theory

RADIOACTIVITY 103Rh(IT)[from 103Ru(β-) produced in 102Ru(n, γ), and 103Pd(EC) produced in 102Pd(n, γ) at the TRIGA reactor of Texas A and M]; measured Eγ, Iγ, K-x rays, K-shell and total internal conversion coefficients; deduced M4 admixture and mixing ratio for the 39.8-keV isomeric transition in 103Rh. Comparison with Dirac-Fock calculations, and results disagree with the theory which ignores the K-shell atomic vacancy. 103Ru(β-)[from 102Ru(n, γ), E=thermal]; measured Eγ, Iγ; deduced K-x ray intensity using the known data for multipolarities and mixing ratios of non-isomeric transitions in 103Rh from the decay of 103Ru. Comparison with previous experimental γ-ray intensities in 103Ru decay.

doi: 10.1103/PhysRevC.98.054321
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Data from this article have been entered in the XUNDL database. For more information, click here.


2017NI10      Phys.Rev. C 95, 064301 (2017)

N.Nica, J.C.Hardy, V.E.Iacob, T.A.Werke, C.M.Folden, K.Ofodile, M.B.Trzhaskovskaya

Precise measurement of αK and αT for the 109.3-keV M4 transition in 125Te: Test of internal-conversion theory

RADIOACTIVITY 125mTe(IT)[from 124Te(n, γ), E=thermal at 1-MW TRIGA reactor of Texas A and M Nuclear Science Center]; measured Eγ, Iγ, E(x ray), I(x ray), K-conversion coefficient, and total conversion coefficient for 109.3-keV M4 transition. Comparison with Dirac-Fock calculations.

doi: 10.1103/PhysRevC.95.064301
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Data from this article have been entered in the XUNDL database. For more information, click here.


2016NI05      Phys.Rev. C 93, 034305 (2016)

N.Nica, J.C.Hardy, V.E.Iacob, T.A.Werke, C.M.Folden, L.Pineda, M.B.Trzhaskovskaya

Precise measurement of αK and αT for the 150.8-keV E3 transition in 111Cd: Test of internal-conversion theory

RADIOACTIVITY 111mCd(IT)[from 110Cd(n, γ), E=thermal from TRIGA reactor at Texas A and M]; measured Eγ, Iγ, I(K-x rays); deduced total and K-conversion coefficients for 150.8-keV E3 transition. Comparison with theoretical value from Dirac-Fock theory which includes the atomic vacancy. Possible evidence of penetration effects for this transition.

doi: 10.1103/PhysRevC.93.034305
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Data from this article have been entered in the XUNDL database. For more information, click here.


2015MA63      Phys.Rev. C 92, 054601 (2015)

D.A.Mayorov, T.A.Werke, M.C.Alfonso, E.E.Tereshatov, M.E.Bennett, M.M.Frey, C.M.Folden

Evaporation residue excitation function measurements in 50Ti- and 54Cr-induced reactions with lanthanide targets

NUCLEAR REACTIONS 160Gd, 159Tb, 162Dy(50Ti, 3n), (50Ti, 4n), (50Ti, 5n), 159Tb, 162Dy(50Ti, 2np), (50Ti, 3np), 159Tb(50Ti, 4np), E=4.9 MeV/nucleon; 162Dy(54Cr, 4n), (54Cr, 5n), (54Cr, 2np), (54Cr, 3np), 5.1 MeV/nucleon; measured reaction products, Eα and half-lives of the radioactive isotopes produced, σ(E) of evaporation residues (ER), (ER)αα-correlations, using MARS spectrometer at Texas A and M cyclotron facility. Enriched targets. 159Tb, 162Dy(48Ca, 3n), 154Gd, 159Tb, 162Dy, 165Ho(48Ca, 4n), (48Ca, 5n), 176Hf(40Ar, 4n), (40Ar, 5n), 124Sn(92Zr, 4n), (92Zr, 5n), E(*)=35-60 MeV; analyzed σ(E). Statistical model analysis, and comparison with predictions of Bohr-Wheeler transition-state theory. Discussed effect of collective enhancement of level density (CELD).

RADIOACTIVITY 204,205,206Rn, 204,205,206,208,209Fr, 208,209Ra(α)[from 160Gd, 159Tb, 162Dy(50Ti, X), E=4.9 MeV/nucleon; 212,213Ac(α)[from 162Dy(54Cr, X), E=5.1 MeV/nucleon]; measured Eα, half-lives of 205Fr and 208Ra decays.

doi: 10.1103/PhysRevC.92.054601
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2203. Data from this article have been entered in the XUNDL database. For more information, click here.


2015WE13      Phys.Rev. C 92, 034613 (2015)

T.A.Werke, D.A.Mayorov, M.C.Alfonso, M.E.Bennett, M.J.DeVanzo, M.M.Frey, E.E.Tereshatov, C.M.Folden

Hot fusion-evaporation cross sections of 45Sc-induced reactions with lanthanide targets

NUCLEAR REACTIONS 156,157,158,160Gd, 159Tb, 162Dy(45Sc, 3n), (45Sc, 4n), (45Sc, 5n), (45Sc, 6n), (45Sc, 2np), (45Sc, 3np), 162Dy(45Sc, α), (45Sc, nα), (45Sc, 2nα), E≈5 MeV/nucleon; measured reaction products, Eα from decay products, evaporation residue cross sections σ(E) for 3n-, 4n-, 5n-, 6n-, p2n-, p3n-, p4n-, p5n-channels and α-, αn, α2n-channels for 162Dy using Momentum Achromat Recoil Spectrometer (MARS) at Texas A and M; deduced influence of collective enhancements to level density (CELD). Comparison with theoretical model for the fusion-evaporation process. Relevance to production of SHE region nuclei.

RADIOACTIVITY 197,198,199,200m,201At, 197,198,199,201mPo, 200,203mRn, 203Fr(α)[from 156,157,158,160Gd, 159Tb, 162Dy(45Sc, 4n), (45Sc, 3np), E≈5 MeV/nucleon]; measured Eα. Comparison with previously measured values.

doi: 10.1103/PhysRevC.92.034613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2193.


2015WE16      Phys.Rev. C 92, 054617 (2015)

T.A.Werke, D.A.Mayorov, M.C.Alfonso, E.E.Tereshatov, C.M.Folden, III

Hot fusion-evaporation cross sections of 44Ca-induced reactions with lanthanide targets

NUCLEAR REACTIONS 158Gd(44Ca, 3n), (44Ca, 4n), (44Ca, 5n), (44Ca, 6n), E=177.6, 184.2, 185.7, 188.4, 191.3, 196.0; 159Tb(44Ca, 3n), (44Ca, 4n), (44Ca, 5n), (44Ca, 3np), (44Ca, 4np), (44Ca, 5np), E=184.7, 189.8, 196.3, 200.5, 208.0; 162Dy(44Ca, 3n), (44Ca, 4n), (44Ca, 5n), (44Ca, 2np), (44Ca, 3np), (44Ca, 4np), (44Ca, 5np), E=183.7, 188.9, 195.4, 199.5, 207.1; measured reaction products, σ(E) using Momentum Recoil Achromat Spectrometer (MARS) at Cyclotron Institute of Texas A and M University. Comparison with theoretical model calculations with and without consideration of collective enhancements to level density (CELD), and with experimental σ(E) for 45Sc induced reactions on the same targets; deduced little evidence for cross-sectional enhancement due to shell stabilization of compound nucleus.

RADIOACTIVITY 197,198Po(α)[from 158Gd(44Ca, 5n), (44Ca, 4n), E≈5 MeV/nucleon]; 199At, 199mPo(α)[from 159Tb(44Ca, 4n), (44Ca, 3np), E≈5 MeV/nucleon]; 202Rn, 202At(α)[from 162Dy(44Ca, 4n), (44Ca, 3np), E≈5 MeV/nucleon]; Measured Eα, and T1/2 of 199At, 202Rn decays. Comparison with evaluated data in the chart of nuclides on NNDC webpage.

doi: 10.1103/PhysRevC.92.054617
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2206. Data from this article have been entered in the XUNDL database. For more information, click here.


2014MA66      Phys.Rev. C 90, 024602 (2014)

D.A.Mayorov, T.A.Werke, M.C.Alfonso, M.E.Bennett, C.M.Folden

Production cross sections of elements near the N=126 shell in 48Ca-induced reactions with 154Gd, 159Tb, 162Dy, and 165Ho targets

NUCLEAR REACTIONS 154Gd(48Ca, 3n)199mPo, 154Gd(48Ca, 4n)198Po, 154Gd(48Ca, 5n)197mPo, 159Tb(48Ca, 3n)204At, (48Ca, 4n)203At, (48Ca, 5n)202At, (48Ca, 6n)201At, 162Dy(48Ca, 3n)207Rn, (48Ca, xn)206Rn/205Rn, (48Ca, 6n)204Rn, 165Ho(48Ca, 3n)210Fr, (48Ca, xn)209Fr/208Fr, (48Ca, 6n)207Fr, E=180-210 MeV; measured reaction products, α spectra from residues, evaporation residue σ(E) using MARS spectrometer at Texas A-M cyclotron facility; deduced signature of collective effects. Comparison with theoretical σ(E), calculated with and without the inclusion of collective enhancement of level density. Discussed implications for production of superheavy elements.

RADIOACTIVITY 198,199mPo, 203,204At, 206,207Rn, 209,210Fr(α)[from 154Gd, 159Tb, 162Dy, 165Ho(48Ca, xn), E=180-210 meV]; measured Eα, compared with previous experimental values.

doi: 10.1103/PhysRevC.90.024602
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2127.


2012BE07      Nucl.Instrum.Methods Phys.Res. B276, 62 (2012)

M.E.Bennett, D.A.Mayorov, K.D.Chapkin, M.C.Alfonso, T.A.Werke, C.M.Folden III

Measurement of the natLu(p, x)175Hf excitation function

NUCLEAR REACTIONS Lu(p, X)175Hf, E=5.2-16.7 MeV; Ti(p, X)48V, E=6.9-16 MeV; measured reaction products, Eγ, Iγ; deduced σ. Comparison with available data.

doi: 10.1016/j.nimb.2012.01.039
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1909.


2012FO09      Nucl.Instrum.Methods Phys.Res. A678, 1 (2012)

C.M.Folden III, M.C.Alfonso, D.A.Mayorov, K.R.Lawrence, A.A.Alharbi, E.Berdugo, P.J.Cammarata, A.C.Raphelt, B.T.Roeder, T.A.Werke

Development of the MARS separator for heavy element studies

NUCLEAR REACTIONS 165Ho(40Ar, xnyp)197Po/197mPo/198Po/198At/199Po/199mPo/199At/200At, E=220.2 MeV; measured Eα, half-lives, (EVR)α correlations, excitation functions, σ for production of heavy-element studies using MARS separator at Texas A

doi: 10.1016/j.nima.2012.02.035
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Data from this article have been entered in the XUNDL database. For more information, click here.


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