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NSR database version of April 24, 2024.

Search: Author = A.M.Howard

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2021HU13      Astrophys.J. 912, 59 (2021)

N.J.Hubbard, C.Aa.Diget, S.P.Fox, H.O.U.Fynbo, A.M.Howard, O.S.Kirsebom, A.M.Laird, M.Munch, A.Parikh, M.Pignatari, J.R.Tomlinson

New Experimental 23Na(α, p)26Mg Reaction Rate for Massive Star and Type Ia Supernova Models

NUCLEAR REACTIONS 23Na(α, p), E(cm)=1-3.25 MeV; analyzed available data; deduced astrophysical reaction rates, angle integrated σ.

doi: 10.3847/1538-4357/abee91
Citations: PlumX Metrics


2020HO05      Phys.Rev. C 101, 034309 (2020)

A.M.Howard, S.J.Freeman, D.K.Sharp, T.Bloxham, J.A.Clark, C.M.Deibel, B.P.Kay, P.D.Parker, J.P.Schiffer, J.S.Thomas

Neutron-hole strength in N=81 nuclei

NUCLEAR REACTIONS 138Ba, 140Ce, 142Nd, 144Sm(p, d), E=23 MeV; 138Ba, 140Ce, 142Nd, 144Sm(3He, α), E=34 MeV; measured Ed, Id, Eα, Iα, σ(θ) using the Enge split-pole spectrograph and multi-wire gas proportional counter backed by plastic scintillator at the tandem Van de Graaff accelerator of Yale University. 137Ba, 139Ce, 141Nd, 143Sm; deduced levels, J, π, L-transfer, configurations, spectroscopic factors, proton occupancies, neutron hole strengths and centroids, summed strengths. DWBA analysis. Comparison with predictions of particle-vibration coupling calculations.

doi: 10.1103/PhysRevC.101.034309
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Data from this article have been entered in the XUNDL database. For more information, click here.


2020KI10      Eur.Phys.J. A 56, 179 (2020)

O.S.Kirsebom, A.M.Howard, M.Munch, S.Sablok, J.A.Swartz, H.O.U.Fynbo

Experimental study of the 11B(p, 3α)γ reaction at Ep = 0.5-2.7 MeV

doi: 10.1140/epja/s10050-020-00183-z
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2452.


2017FE07      Phys.Rev. C 96, 024613 (2017)

M.Febbraro, F.D.Becchetti, R.O.Torres-Isea, J.Riggins, C.C.Lawrence, J.J.Kolata, A.M.Howard

(d, n) proton-transfer reactions on 9Be, 11B, 13C, 14, 15N, and 19F and spectroscopic factors at Ed = 16 MeV

NUCLEAR REACTIONS 9Be, 11B, 13C, 14,15N, 19F(d, n), E=16 MeV; measured neutron spectra, time-of-flight spectra, σ(θ) using deuterated liquid-scintillator array (UM-DSA) at the Tandem accelerator facility of University of Notre Dame. Solid and gaseous targets. Finite-range distorted-wave Born approximation (FR-DWBA) analysis with common bound-state, global, and local optical-model parameter sets. 10B, 12C, 14N, 15,16O, 20Ne; deduced levels, L-transfer, J, π, configuration, spectroscopic factors. Comparison with previous measurements and theoretical calculations.

doi: 10.1103/PhysRevC.96.024613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2272. Data from this article have been entered in the XUNDL database. For more information, click here.


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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Data from this article have been entered in the XUNDL database. For more information, click here.


2015HO09      Phys.Rev.Lett. 115, 052701 (2015)

A.M.Howard, M.Munch, H.O.U.Fynbo, O.S.Kirsebom, K.L.Laursen, C.A.Diget, N.J.Hubbard

23Na(α, p)26Mg Reaction Rate at Astrophysically Relevant Energies

NUCLEAR REACTIONS 23Na(α, p), E(cm)=1.7-2.5 MeV; measured reaction products, Ep, Ip; deduced σ(θ), σ, reaction rates. Comparison with the statistical model code NON-SMOKER.

doi: 10.1103/PhysRevLett.115.052701
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2269.


2013KA04      Phys.Rev. C 87, 011302 (2013)

B.P.Kay, T.Bloxham, S.A.McAllister, J.A.Clark, C.M.Deibel, S.J.Freedman, S.J.Freeman, K.Han, A.M.Howard, A.J.Mitchell, P.D.Parker, J.P.Schiffer, D.K.Sharp, J.S.Thomas

Valence neutron properties relevant to the neutrinoless double-β decay of 130Te

NUCLEAR REACTIONS 128,130Te(p, d), E=23 MeV; 128,130Te, 130,132Xe(d, p), E=15 MeV; 128,130Te, 130,132Xe(α, 3He), E=50 MeV; 130Te(3He, α), E=40 MeV; 132Xe(p, t), E=23 MeV; measured deuteron, proton, triton, 3He, α spectra, σ(θ) using Enge-split pole magnetic spectrograph at Yale Tandem accelerator facility. 127,129,131Te, 130,131,133Xe; deduced levels, J, π, L-transfers. 128,130Te, 130,132Xe; deduced neutron vacancies for active orbitals. Comparison with calculations within both the quasiparticle random-phase approximation and shell-model frameworks. Discussed relevance to neutrinoless double β decay of 130Te.

doi: 10.1103/PhysRevC.87.011302
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1990. Data from this article have been entered in the XUNDL database. For more information, click here.


2013RO10      Phys.Rev. C 87, 051305 (2013)

A.Roberts, A.M.Howard, J.J.Kolata, A.N.Villano, F.D.Becchetti, P.A.DeYoung, M.Febbraro, S.J.Freeman, B.P.Kay, S.A.McAllister, A.J.Mitchell, J.P.Schiffer, J.S.Thomas, R.O.Torres-Isea

Proton pair correlations and the neutrinoless double-β decay of 76Ge

NUCLEAR REACTIONS 74,76Ge(3He, n), E=16 MeV; measured E(n), I(n), time-of-flight, σ(θ) for g.s. and first 2+ state using the Neutron Wall at Notre Dame. 76,78Se; deduced levels, proton pair correlations. DWBA analysis. Comparison with quasiparticle random phase approximation (QRPA) model calculations. Relevance to matrix elements for 0νββ decay of 76Ge. Systematics of ground-state cross sections on fpg-shell nuclei of A=60-90, and comparison with theoretical models. No evidence for the breaking of the BCS approximation for paired protons.

doi: 10.1103/PhysRevC.87.051305
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Data from this article have been entered in the XUNDL database. For more information, click here.


2013SC06      Phys.Rev. C 87, 034306 (2013)

J.P.Schiffer, C.R.Hoffman, B.P.Kay, J.A.Clark, C.M.Deibel, S.J.Freeman, M.Honma, A.M.Howard, A.J.Mitchell, T.Otsuka, P.D.Parker, D.K.Sharp, J.S.Thomas

Valence nucleon populations in the Ni isotopes

NUCLEAR REACTIONS 58,60,62,64Ni(d, p), E=10 MeV; 58,60,62,64Ni(α, 3He), (α, t), E=38 MeV; 58,60,62,64Ni(p, d), E=28 MeV; 58,60,62,64Ni(3He, d), E=18 MeV; 58,60,62,64Ni(3He, α), E=25 MeV; measured proton, deuteron, triton, 3He, α spectra, σ(θ) using Enge-split pole magnetic spectrograph at Yale tandem accelerator facility. 57,59,61,63,65Ni, 59,61,63,65Cu; deduced levels, J, π, l-transfers, spectroscopic factors. DWBA analysis. 58,60,62,64Ni; deduced neutron occupancies, proton vacancies, energy centroids of the neutron, neutron-hole, and proton single-particle excitations. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.87.034306
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1991. Data from this article have been entered in the XUNDL database. For more information, click here.


2013SH02      Phys.Rev. C 87, 014312 (2013)

D.K.Sharp, B.P.Kay, J.S.Thomas, S.J.Freeman, J.P.Schiffer, B.B.Back, S.Bedoor, T.Bloxham, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, A.J.Mitchell, T.Otsuka, P.D.Parker, K.E.Rehm, D.V.Shetty, A.H.Wuosmaa

Neutron single-particle strength outside the N=50 core

NUCLEAR REACTIONS 88Sr, 90Zr, 92Mo(d, p), E=15 MeV; 88Sr, 90Zr, 92Mo(α, 3He), E=50 MeV; measured proton and 3He spectra, σ(θ) using Enge-split pole magnetic spectrograph at Yale. 2H(86Kr, p), E=10 MeV/nucleon; measured proton spectra, σ(θ) using HELIOS spectrometer at ANL. 87Kr, 89Sr, 91Zr, 93Mo; deduced levels, J, π, absolute σ, L-transfers, spectroscopic factors, centroids of single-particle strengths. DWBA analysis.

doi: 10.1103/PhysRevC.87.014312
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1975. Data from this article have been entered in the XUNDL database. For more information, click here.


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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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2027. Data from this article have been entered in the XUNDL database. For more information, click here.


2012HO26      J.Phys.:Conf.Ser. 381, 012098 (2012)

A.M.Howard, S.J.Freeman, J.P.Schiffer, T.Bloxham, J.A.Clark, C.M.Deibel, B.P.Kay, P.D.Parker, D.K.Sharp, J.S.Thomas

Neutron-hole strength in the N = 81 isotone

NUCLEAR REACTIONS 138Ba, 140Ce, 142Nd, 144Sm(p, d), E=23 MeV;138Ba, 140Ce, 142Nd, 144Sm(3He, α), E=34 MeV; measured light reaction products E(particle), I(particle, θ) using Enge split-pole spectrograph, position-sensitive IC and scintillator; deduced σ(θ), spectroscopic strength for specified angular momentum transfers, single-particle binding energy.

doi: 10.1088/1742-6596/381/1/012098
Citations: PlumX Metrics


2012KA44      J.Phys.:Conf.Ser. 381, 012095 (2012)

B.P.Kay, M.Alcorta, B.B.Back, S.I.Baker, S.Bedoor, T.Bloxham, J.A.Clark, C.M.Deibel, S.J.Freeman, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, A.J.Mitchell, K.E.Rehm, J.P.Schiffer, D.K.Sharp, D.V.Shetty, J.S.Thomas, A.H.Wuosmaa, S.Zhu

HELIOS - progress and possibilities

doi: 10.1088/1742-6596/381/1/012095
Citations: PlumX Metrics


2012KO18      Phys.Rev. C 85, 054603 (2012)

J.J.Kolata, A.Roberts, A.M.Howard, D.Shapira, J.F.Liang, C.J.Gross, R.L.Varner, Z.Kohley, A.N.Villano, H.Amro, W.Loveland, E.Chavez

Fusion of 124, 132Sn with 40, 48Ca

NUCLEAR REACTIONS 40,48Ca(124Sn, X), (132Sn, X), E(cm)=105-165 MeV; measured evaporation residue spectra, fusion σ(E); deduced reduced fusion σ(E), fusion barriers. Inverse kinematics. Wong model and PACE2 fits. Comparison with time-dependent Hartree-Fock (TDHF) and coupled-channels Born approximation (CCBA) calculations.

doi: 10.1103/PhysRevC.85.054603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1922.


2012MC06      J.Phys.:Conf.Ser. 381, 012043 (2012)

S.A.McAllister, B.P.Kay, S.J.Freeman, J.P.Schiffer, C.M.Diebel, T.Bloxham, A.M.Howard, P.D.Parker, D.K.Sharp, J.S.Thomas

Constraining neutrinoless double β decay matrix elements in 130Te

NUCLEAR REACTIONS 128,130Te(p, t), E=23 MeV;128,130Te(d, p), (α, α'), E=15 MeV; 128,130Te(3He, α), E=40 MeV;128,130Te(α, 3He), E=50 MeV; measured reaction products at specified (forward) angles; deduced (d, p) spectroscopic factors. Preliminary. Other reactions under analysis.

doi: 10.1088/1742-6596/381/1/012043
Citations: PlumX Metrics


2012MI26      J.Phys.:Conf.Ser. 381, 012099 (2012)

A.J.Mitchell, S.J.Freeman, J.P.Schiffer, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, B.P.Kay, P.D.Parker, D.K.Sharp, J.S.Thomas

Investigating trends in proton single-particle states in Z = 51 isotopes using transfer reactions

NUCLEAR REACTIONS 112,114,116,118,120,122,124Sn(α, t), E=37.5 MeV;112,114,116,118,120,122,124Sn(3He, d), E=25 MeV; measured E(particle), I(particle, θ) using Enge split-pole spectrometer; calculated σ(θ) using DWBA; deduced spectroscopic factors, σ(θ) for specified l-transfer, occupancies of neutron orbitals. Occupation of h11/2 increases rapidly with N. Preliminary.

doi: 10.1088/1742-6596/381/1/012099
Citations: PlumX Metrics


2012SC01      Phys.Rev.Lett. 108, 022501 (2012)

J.P.Schiffer, C.R.Hoffman, B.P.Kay, J.A.Clark, C.M.Deibel, S.J.Freeman, A.M.Howard, A.J.Mitchell, P.D.Parker, D.K.Sharp, J.S.Thomas

Test of Sum Rules in Nucleon Transfer Reactions

NUCLEAR STRUCTURE 58,60,62,64Ni; calculated spectroscopic factors for neutron transfer, valence-orbit occupancies. Macfarlane-French sum rules.

NUCLEAR REACTIONS Ni(α, α), E=9 MeV; Ni(d, p), E=10 MeV; Ni(p, d), E=28 MeV; Ni(3He, d), E=18 MeV; Ni(α, t), E=38 MeV; measured reaction products. 58,60,62,64Ni; deduced spectroscopic factors, neutron occupancies. DWBA calculations.

doi: 10.1103/PhysRevLett.108.022501
Citations: PlumX Metrics


2012SH40      J.Phys.:Conf.Ser. 381, 012100 (2012)

D.K.Sharp, B.P.Kay, S.J.Freeman, J.P.Schiffer, B.B.Back, T.Bloxham, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, A.J.Mitchell, P.D.Parker, J.S.Thomas, A.H.Wuosmaa

Trends in the g7/2 and h11/2 neutron single-particle energies in N = 51 isotones

NUCLEAR REACTIONS 88Sr, 90Zr, 92Mo(d, p), E=15 MeV;88Sr, 90Zr, 92Mo(α, 3He), E=50 MeV; measured E(3He), I(3He, θ), Ep, Ip(θ) using Enge split-pole spectrometer; calculated σ(θ), spectroscopic factors using DWBA code PTOLEMY; deduced spectroscopic factors for specified l-transfers. 2H(86Kr, p), E=10 MeV/nucleon; measured Ep, Ip(θ) using HELIOS spectrometer; calculated σ(θ) using DWBA; deduced σ(θ).

doi: 10.1088/1742-6596/381/1/012100
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2011KA27      Phys.Rev. C 84, 024325 (2011)

B.P.Kay, J.P.Schiffer, S.J.Freeman, C.R.Hoffman, B.B.Back, S.I.Baker, S.Bedoor, T.Bloxham, J.A.Clark, C.M.Deibel, A.M.Howard, J.C.Lighthall, S.T.Marley, K.E.Rehm, D.K.Sharp, D.V.Shetty, J.S.Thomas, A.H.Wuosmaa

Single-neutron energies outside 136Xe

NUCLEAR REACTIONS 2H(136Xe, p), E=10 MeV/nucleon; measured Ep, Ip, time of flight, absolute σ, σ(θ) using Helios spectrometer at the ATLAS facility at ANL. 137Xe; deduced levels, J, π, l-transfers, spectroscopic factors, configurations. DWBA analysis of σ(θ) distributions.

doi: 10.1103/PhysRevC.84.024325
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1855. Data from this article have been entered in the XUNDL database. For more information, click here.


2011KA48      J.Phys.:Conf.Ser. 312, 092034 (2011)

B.P.Kay, J.P.Schiffer, S.J.Freeman, B.B.Back, S.Bedoor, S.I.Baker, T.Bloxham, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, K.E.Rehm, D.K.Sharp, D.V.Shetty, J.S.Thomas, A.H.Wuosmaa

Study of valence neutrons in 136Xe with HELIOS

NUCLEAR REACTIONS 2H, C(136Xe, p), (136Xe, d), E=5, 10 MeV/nucleon; measured E(particle), I(particle, θ), A/Q ratio using position-sensitive Si detectors, ToF using radio-frequency of ATLAS facility; deduced σ(p, θ) for specified angular momentum transfer; calculated σ(θ) for specified angular momentum transfer using DWBA code PTOLEMY.

doi: 10.1088/1742-6596/312/9/092034
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2010BL06      Phys.Rev. C 82, 027308 (2010)

T.Bloxham, B.P.Kay, J.P.Schiffer, J.A.Clark, C.M.Deibel, S.J.Freeman, S.J.Freedman, A.M.Howard, S.A.McAllister, P.D.Parker, D.K.Sharp, J.S.Thomas

Pair correlations in the neutrinoless double-β decay candidate 130Te

NUCLEAR REACTIONS 128,130Te(p, t), E=23 MeV; measured triton spectra, σ(θ). 126,128Te; deduced levels, L-transfers. Split-pole magnetic spectrograph and gas-filled focal plane detector. Comparison with data for 128,130Te(3He, n) reactions. Relevance to calculation of the matrix element for neutrinoless double-β decay of 130Te.

doi: 10.1103/PhysRevC.82.027308
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2229. Data from this article have been entered in the XUNDL database. For more information, click here.


2010ME07      Phys.Rev. C 82, 024308 (2010)

D.Mengoni, J.J.Valiente-Dobon, A.Gadea, S.Lunardi, S.M.Lenzi, R.Broda, A.Dewald, T.Pissulla, L.J.Angus, S.Aydin, D.Bazzacco, G.Benzoni, P.G.Bizzeti, A.M.Bizzeti-Sona, P.Boutachkov, L.Corradi, F.Crespi, G.de Angelis, E.Farnea, E.Fioretto, A.Goergen, M.Gorska, A.Gottardo, E.Grodner, A.M.Howard, W.Krolas, S.Leoni, P.Mason, D.Montanari, G.Montagnoli, D.R.Napoli, A.Obertelli, R.Orlandi, T.Pawlat, G.Pollarolo, F.Recchia, A.Algora, B.Rubio, E.Sahin, F.Scarlassara, R.Silvestri, J.F.Smith, A.M.Stefanini, D.Steppenbeck, S.Szilner, C.A.Ur, P.T.Wady, J.Wrzesinski

Lifetime measurements of excited states in neutron-rich 44, 46Ar populated via a multinucleon transfer reaction

NUCLEAR REACTIONS 208Pb(48Ca, X)42Ar/43Ar/44Ar/45Ar/46Ar, E=310 MeV; measured Eγ, Iγ, (recoils)γ-coin, and half-lives by differential RDDS method. CLARA-PRISMA system. 44,46Ar; deduced levels, B(E2). Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.82.024308
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Data from this article have been entered in the XUNDL database. For more information, click here.


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