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NSR database version of April 11, 2024.

Search: Author = M.Barr

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2020GR08      J.Phys.(London) G47, 085104 (2020)

M.R.Griffiths, C.Wheldon, Tz.Kokalova, A.Turner, S.Pirrie, V.Ziman, N.I.Ashwood, J.D.Malcolm, M.Barr, M.Freer, Th.Faestermann, H-F.Wirth, R.Hertenberger, R.Gernhauser, R.Krucken

Mass measurement of Re-190

NUCLEAR REACTIONS ¹⁹²Os, ¹⁹⁴Pt(d, α)¹⁹⁰Re/¹⁹²Ir, E=18 MeV; measured Eα, Iα using Q3D magnetic spectrograph at MLL-Munich tandem Van de Graaff accelerator facility. ¹⁹⁰Re, ¹⁹²Ir; deduced levels, J, π.

ATOMIC MASSES ¹⁹⁰Re; deduced mass excess, atomic mass and binding energy. Comparison with values in AME2016.

doi: 10.1088/1361-6471/ab98e3
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Data from this article have been entered in the XUNDL database. For more information, click here.

2017JO07      Phys.Rev. C 95, 064321 (2017)

P.R.John, J.J.Valiente-Dobon, D.Mengoni, V.Modamio, S.Lunardi, D.Bazzacco, A.Gadea, C.Wheldon, T.R.Rodriguez, T.Alexander, G.de Angelis, N.Ashwood, M.Barr, G.Benzoni, B.Birkenbach, P.G.Bizzeti, A.M.Bizzeti-Sona, S.Bottoni, M.Bowry, A.Bracco, F.Browne, M.Bunce, F.Camera, L.Corradi, F.C.L.Crespi, B.Melon, E.Farnea, E.Fioretto, A.Gottardo, L.Grente, H.Hess, Tz.Kokalova, W.Korten, A.Kusoglu, S.Lenzi, S.Leoni, J.Ljungvall, R.Menegazzo, C.Michelagnoli, T.Mijatovic, G.Montagnoli, D.Montanari, D.R.Napoli, Zs.Podolyak, G.Pollarolo, F.Recchia, P.Reiter, O.J.Roberts, E.Sahin, M.-D.Salsac, F.Scarlassara, M.Sferrazza, P.-A.Soderstrom, A.M.Stefanini, S.Szilner, C.A.Ur, A.Vogt, J.Walshe

In-beam γ-ray spectroscopy of the neutron-rich platinum isotope ²⁰⁰Pt toward the N=126 shell gap

NUCLEAR REACTIONS ¹⁹⁸Pt(⁸²Se, ⁸⁰Se)²⁰⁰Pt, E=426 MeV; measured Eγ, Iγ, (⁸⁰Se recoils)γγ-coin using PRISMA spectrometer for ⁸⁰Se recoils and AGATA array for Doppler-corrected γ rays at XTU Tandem-ALPI accelerator of LNL-Legnaro facility. ²⁰⁰Pt; deduced levels, J, π, ground-state band, structure above the 17-ns, 7- isomer. Comparison with theoretical model calculations.

NUCLEAR STRUCTURE ^{190,192,194,196,198,200,202,204}Pt; calculated particle-number-projected potential energy surfaces in (β₂, γ) plane, yrast band excitation energies. Beyond mean-field, symmetry-conserving configuration-mixing (SCCM) calculations based on Gogny D1S energy density functionals. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.064321
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Data from this article have been entered in the XUNDL database. For more information, click here.

2016CU02      Phys.Rev. C 94, 034313 (2016)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

⁸Be + ⁸Be and ¹²C + α breakup states in ¹⁶O populated via the ¹³C(⁴He, 4α)n reaction

NUCLEAR REACTIONS ¹³C(α, ¹⁶O), E=22.0, 27.0, 27.5, 28.0 MeV; measured reaction products using four position-sensitive double-sided Si strip detectors, at Notre Dame FN Tandem accelerator facility. ¹⁶O; deduced levels identified through the ⁸Be+⁸Be and ¹²C*+α channels, J, π, centroids, cross sections. Comparison with previous studies using ¹²C(α, ⁸Be)⁸Be and ¹²C(¹⁶O, 4α)¹²C reactions. Relevance to 4α chain structure in ¹⁶O.

doi: 10.1103/PhysRevC.94.034313
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2239. Data from this article have been entered in the XUNDL database. For more information, click here.

2016SM02      Phys.Rev. C 94, 014320 (2016)

R.Smith, C.Wheldon, M.Freer, N.Curtis, Tz.Kokalova, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, V.A.Ziman

Evidence for a 3.8 MeV state in ⁹Be

NUCLEAR REACTIONS ⁹Be(α, n3α), E=22, 26 MeV; measured Eα, Iα using an array of double-sided silicon strip detectors (DSSSDs) at the Notre Dame FN Tandem Van de Graaff accelerator facility; extracted sum energy spectra for all four final-state particles, assumed to be 3α+n, ⁹Be excitation spectrum. ⁹Be; deduced levels, new state at 3.8 MeV, J, π, width, ratios of reduced widths to Wigner limits (decays to ⁸Be ground state). ⁹Be, ⁹B; comparison of levels and widths in mirror nuclei.

doi: 10.1103/PhysRevC.94.014320
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Data from this article have been entered in the XUNDL database. For more information, click here.

2015WH01      Phys.Rev. C 91, 024308 (2015)

C.Wheldon, Tz.Kokalova, M.Freer, J.Walshe, R.Hertenberger, H.-F.Wirth, N.I.Ashwood, M.Barr, N.Curtis, Th.Faestermann, R.Lutter, J.D.Malcolm, D.J.Marin-Lambarri

Spectroscopy of ⁹B via high-resolution ejectile-tagged recoil break-up

NUCLEAR REACTIONS ⁹Be(³He, t)⁹B*, E=33 MeV; measured particle spectra, (⁹B breakup products)(triton)-coin using Munich-Q3D spectrograph at the MLL tandem Van de Graaff accelerator facility. ⁹B; deduced levels, J, π, total and partial widths for ⁸Be+p and ⁵Li+α channels. Comparison with earlier experimental results.

doi: 10.1103/PhysRevC.91.024308
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Data from this article have been entered in the XUNDL database. For more information, click here.

2014JO05      Phys.Rev. C 90, 021301 (2014)

P.R.John, V.Modamio, J.J.Valiente-Dobon, D.Mengoni, S.Lunardi, T.R.Rodriguez, D.Bazzacco, A.Gadea, C.Wheldon, T.Alexander, G.de Angelis, N.Ashwood, M.Barr, G.Benzoni, B.Birkenbach, P.G.Bizzeti, A.M.Bizzeti-Sona, S.Bottoni, M.Bowry, A.Bracco, F.Browne, M.Bunce, F.Camera, B.Cederwall, L.Corradi, F.C.L.Crespi, P.Desesquelles, J.Eberth, E.Farnea, E.Fioretto, A.Gorgen, A.Gottardo, J.Grebosz, L.Grente, H.Hess, A.Jungclaus, Tz.Kokalova, A.Korichi, W.Korten, A.Kusoglu, S.Lenzi, S.Leoni, J.Ljungvall, G.Maron, W.Meczynski, B.Melon, R.Menegazzo, C.Michelagnoli, T.Mijatovic, B.Million, P.Molini, G.Montagnoli, D.Montanari, D.R.Napoli, P.Nolan, C.Oziol, Zs.Podolyak, G.Pollarolo, A.Pullia, B.Quintana, F.Recchia, P.Reiter, O.J.Roberts, D.Rosso, E.Sahin, M.-D.Salsac, F.Scarlassara, M.Sferrazza, J.Simpson, P.-A.Soderstrom, A.M.Stefanini, O.Stezowski, S.Szilner, Ch.Theisen, C.A.Ur, J.Walshe

Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of ¹⁹⁶Os

NUCLEAR REACTIONS ¹⁹⁸Pt(⁸²Se, X), E=426 MeV; measured Eγ, Iγ, γγ-, (⁸⁴Kr)γ-coin using PRISMA spectrometer for fragments and AGATA array for γ rays at Tandem-ALPI-LNL accelerator facility. ¹⁹⁶Os; deduced levels, J, π, γ-unstable/triaxial rotor yrast band. Comparison with state-of-the-art beyond-mean-field calculations.

NUCLEAR STRUCTURE ^{188,190,192,194,196,198}Os; calculated particle number projected potential energy surfaces in (β₂, γ) plane, level energies in the yrast bands using Gogny D1S interaction. State-of-the-art beyond-meanfield calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.90.021301
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Data from this article have been entered in the XUNDL database. For more information, click here.

2013CU04      Phys.Rev. C 88, 064309 (2013)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Investigation of the 4α linear chain state in ¹⁶O

NUCLEAR REACTIONS ¹²C(α, ⁸Be)⁸Be, (α, ¹²C), [¹²C* decaying to ⁸Be+α], E=12.2-20.0 MeV; measured Eα, Iα, α(θ), αα-coin, σ(E, θ) at Notre Dame FN tandem facility. Phase shift analysis of σ(θ) data. ¹⁶O; deduced levels, resonances, J. Comparison with previous experimental results. No evidence found for rigid, 4α-linear chain in ¹⁶O.

doi: 10.1103/PhysRevC.88.064309
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Data from this article have been entered in the XUNDL database. For more information, click here.

2013KO15      Phys.Rev. C 87, 057309 (2013)

Tz.Kokalova, M.Freer, N.Curtis, N.I.Ashwood, M.Barr, J.D.Malcolm, C.Wheldon, V.A.Ziman, S.Almaraz-Calderon, A.Aprahamian, B.Bucher, M.Couder, X.Fang, F.Jung, W.Lu, A.Roberts, W.P.Tan, P.Copp, S.R.Lesher

Yield measurements for resonances above the multi-α threshold in ²⁰Ne

NUCLEAR REACTIONS ¹⁶O(α, X), E=23.0-29.0 MeV; measured α and particle spectra, (particle)(particle)α-coin, yields for ⁸Be+⁸Be+α, and ⁸Be+¹²C(second 0+) channels. Measurements at Notre Dame facility. ²⁰Ne; deduced levels, resonances, J. Monte Carlo simulations.

doi: 10.1103/PhysRevC.87.057309
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Data from this article have been entered in the XUNDL database. For more information, click here.

2012CU04      J.Phys.:Conf.Ser. 381, 012079 (2012)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Does a 4-α linear chain exist in ¹⁶O?

NUCLEAR REACTIONS ¹²C(α, ⁸Be), E=12.2-20.0 MeV; measured Eα, Iα from ⁸Be decay using DSSSD; deduced σ(θ=90⁰), doublet 6⁺ resonance and its components.

doi: 10.1088/1742-6596/381/1/012079
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2012FR11      J.Phys.:Conf.Ser. 381, 012009 (2012)

M.Freer, S.Almaraz-Calderon, J.Carter, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, R.Smit, W.P.Tan, C.Wheldon, V.A.Ziman

Simplicity from Complexity

doi: 10.1088/1742-6596/381/1/012009
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2012WH01      Phys.Rev. C 86, 044328 (2012)

C.Wheldon, N.I.Ashwood, M.Barr, N.Curtis, M.Freer, Tz.Kokalova, J.D.Malcolm, V.A.Ziman, Th.Faestermann, H.-F.Wirth, R.Hertenberger, R.Lutter

Absolute partial decay-branch measurements in ¹³C

NUCLEAR REACTIONS ⁹Be(⁶Li, d)¹³C*, E=42 MeV; measured deuteron, neutron and α spectra from breakup of ¹³C, (particle)(particle)-coin, absolute partial branching ratios for neutron and α decays, widths using Q3D magnetic spectrograph at MLL, Munich facility. ¹³C; deduced levels, J, π, branching ratios, reduced widths, molecular band levels. Comparison with previous studies.

doi: 10.1103/PhysRevC.86.044328
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Data from this article have been entered in the XUNDL database. For more information, click here.

2012WH02      J.Phys.:Conf.Ser. 381, 012078 (2012)

C.Wheldon, N.I.Ashwood, M.Barr, N.Curtis, M.Freer, Tz.Kokalova, J.D.Malcolm, S.J.Spencer, V.A.Ziman, Th.Faestermann, R.Krucken, H.-F.Wirth, R.Hertenberger, R.Lutter, A.Bergmaier

Absolute decay width measurements in ¹⁶O

NUCLEAR REACTIONS ¹²C(⁶Li, d), E=42 MeV; measured E(deuteron), I(deuteron) using high-resolution Q3D spectrograph, recoil products, break-up products. ¹⁶O deduced α decay width of excited states between 13.9 and 15.9 MeV, relative and absolute α-decay width.

doi: 10.1088/1742-6596/381/1/012078
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2011FR02      Phys.Rev. C 83, 034314 (2011)

M.Freer, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Evidence for a new ¹²C state at 13.3 MeV

NUCLEAR REACTIONS ⁹Be, ¹²C(α, 3α), E=22-30 MeV; measured Eα, Iα, ¹²C-α angular correlations; deduced Dalitz plot. ¹²C; deduced levels, J, π, width. Possible collective excitation of Hoyle state.

doi: 10.1103/PhysRevC.83.034314
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Data from this article have been entered in the XUNDL database. For more information, click here.

2011FR14      J.Phys.(London) G38, 115106 (2011)

M.Freer, N.I.Ashwood, M.Barr, N.Curtis, J.Gibelin, F.Haas, J.D.Malcolm, T.Munoz-Britton, G .Randisi, N.Soic, V.A.Ziman

Access to resonant states in ²⁴Mg using the ¹²C(¹³C, ⁴He+²⁰Ne)n reaction

NUCLEAR REACTIONS ¹²C(¹³C, n), (¹³C, α), E=12, 13.5, 20 MeV; measured reaction products. ²⁵Mg; deduced ²⁴Mg excited states from neutron evaporation in compound nucleus.

doi: 10.1088/0954-3899/38/11/115106
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2011WH01      Phys.Rev. C 83, 064324 (2011)

C.Wheldon, N.I.Ashwood, M.Barr, N.Curtis, M.Freer, Tz.Kokalova, J.D.Malcolm, S.J.Spencer, V.A.Ziman, Th.Faestermann, R.Krucken, H.-F.Wirth, R.Hertenberger, R.Lutter, A.Bergmaier

High-resolution measurement of absolute α-decay widths in ¹⁶O

NUCLEAR REACTIONS ¹²C(⁶Li, d)¹⁶O, E=42 MeV; measured deuteron and α spectra, (⁴He+¹²C)d-coin. ¹⁶O; deduced levels, α decay widths. Cluster structures in ¹⁶O.

doi: 10.1103/PhysRevC.83.064324
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Data from this article have been entered in the XUNDL database. For more information, click here.

2010FR04      J.Phys.(London) G37, 125102 (2010)

M.Freer, N.I.Ashwood, M.Barr, N.Curtis, J.Gibelin, F.Haas, J.D.Malcolm, T.Munoz-Britton, G.Randisi, N.Soic, V.A.Ziman

Neutron decay of excited states in ²¹Ne populated in the ¹²C(¹³C, ²¹Ne)⁴He reaction

NUCLEAR REACTIONS ¹²C(¹³C, α)²¹Ne, E=20 MeV; measured reaction products, Eα, Iα; ²¹Ne deduced excitation energy spectrum, J, π, strengths, neutron decay mode. Comparison with compilations.

doi: 10.1088/0954-3899/37/12/125102
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Data from this article have been entered in the XUNDL database. For more information, click here.