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NSR database version of April 27, 2024.

Search: Author = J.D.Malcolm

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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.

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.

2014FR14      Phys.Rev. C 90, 054324 (2014)

M.Freer, J.D.Malcolm, N.L.Achouri, N.I.Ashwood, D.W.Bardayan, S.M.Brown, W.N.Catford, K.A.Chipps, J.Cizewski, N.Curtis, K.L.Jones, T.Munoz-Britton, S.D.Pain, N.Soic, C.Wheldon, G.L.Wilson, V.A.Ziman

Resonances in ¹⁴C observed in the ⁴He(¹⁰Be, α)¹⁰Be reaction

NUCLEAR REACTIONS ⁴He(¹⁰Be, α), E=25, 27, 29, 32, 34, 38, 40, 44, 48 MeV; measured Eα, Iα, resonant scattering yields, angular distributions at HRIBF-ORNL accelerator facility. ¹⁴C; deduced levels, resonances, J, π, widths using R-matrix analysis, ¹⁰Be+α cluster bands; compiled data on α-decaying resonances from 14.3 to 25.0 MeV excitation energy from the present and previous experiments.

doi: 10.1103/PhysRevC.90.054324
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2146. 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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2012FR01      Phys.Rev. C 85, 014304 (2012)

M.Freer, N.L.Achouri, C.Angulo, N.I.Ashwood, D.W.Bardayan, S.Brown, W.N.Catford, K.A.Chipps, N.Curtis, P.Demaret, C.Harlin, B.Laurent, J.D.Malcolm, M.Milin, T.Munoz-Britton, N.A.Orr, S.D.Pain, D.Price, R.Raabe, N.Soic, J.S.Thomas, C.Wheldon, G.Wilson, V.A.Ziman

Resonances in ¹¹C observed in the ⁴He(⁷Be, α)⁷Be and ⁴He(⁷Be, p)¹⁰B reactions

NUCLEAR REACTIONS ⁴He(⁷Be, α), (⁷Be, p), E=7.1, 23 MeV; measured α and proton spectra, time of flight, cross section. ¹¹C; deduced resonances, levels, J, π, width, α width, p width, R-Matrix analysis. Comparison of partial widths with Wigner limit, evidence of cluster-like structures. Comparison of level structures and analog states of ¹¹C and ¹¹B.

doi: 10.1103/PhysRevC.85.014304
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1890. Data from this article have been entered in the XUNDL database. For more information, click here.

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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2012MA66      J.Phys.:Conf.Ser. 381, 012077 (2012)

J.D.Malcolm, M.Freer, N.I.Ashwood, N.Curtis, T.Munoz-Britton, C.Wheldon, V.A.Ziman, W.N.Catford, S.Brown, G.Wilson, N.Soic, D.Bardayan, S.D.Pain, N.L.Achouri, K.Chipps, K.Crzywacz-Jones

Study of states in ¹⁴C via the ¹⁰Be(⁴He, ⁴He)¹⁰Be reaction

NUCLEAR REACTIONS ¹⁰Be(α, α), E=25.0, 27.0, 29.0, 32.0, 34.0, 38.0, 40.0, 42.0, 44.0, 46.0 MeV; measured resonance scattering products. ¹⁴C deduced possible molecular rotational bands, energy, J, π.

doi: 10.1088/1742-6596/381/1/012077
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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.