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Search: Author = A.J.Howard

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1998UT02      Phys.Rev. C57, 2731 (1998); Erratum Phys.Rev. C58, 1354 (1998)

S.Utku, J.G.Ross, N.P.T.Bateman, D.W.Bardayan, A.A.Chen, J.Gorres, A.J.Howard, C.Iliadis, P.D.Parker, M.S.Smith, R.B.Vogelaar, M.Wiescher, K.Yildiz

Breakout from the Hot CNO Cycle: The ¹⁸F(p, γ) vs ¹⁸F(p, α) branching ratio

NUCLEAR REACTIONS ¹⁹F(³He, t), (³He, tα), (³He, pt), E=29.8 MeV; ¹⁶O(⁶Li, t), (⁶Li, ³He), E=32 MeV; measured particle spectra, tp-, tα-coin; deduced reaction rates for ¹⁸F + p. ¹⁹F deduced levels, resonance features. Astrophysical implications.

doi: 10.1103/PhysRevC.57.2731
Citations: PlumX Metrics

1996HA26      Phys.Rev. C54, 1999 (1996)

K.I.Hahn, A.Garcia, E.G.Adelberger, P.V.Magnus, A.D.Bacher, N.Bateman, G.P.A.Berg, J.C.Blackmon, A.E.Champagne, B.Davis, A.J.Howard, J.Liu, B.Lund, Z.Q.Mao, D.M.Markoff, P.D.Parker, M.S.Smith, E.J.Stephenson, K.B.Swartz, S.Utku, R.B.Vogelaar, K.Yildiz

Structure of ¹⁸Ne and the Breakout from the Hot CNO Cycle

NUCLEAR REACTIONS, ICPND ¹²C(¹²C, ⁶He), E=80 MeV; ¹⁶O(³He, n), E=10.9-14.5 MeV; ²⁰Ne(p, t), E=44, 88 MeV; measured σ(θ). ¹⁸Ne deduced levels, Γ, J, π. ¹⁴O(α, p), E(cm) ≤ 2.5 MeV; calculated astrophysical S-factor vs E, astrophysical reaction rate vs temperature.

doi: 10.1103/PhysRevC.54.1999
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1144.

1996VO07      Phys.Rev. C53, 1945 (1996)

R.B.Vogelaar, L.W.Mitchell, R.W.Kavanagh, A.E.Champagne, P.V.Magnus, M.S.Smith, A.J.Howard, P.D.Parker, H.A.O'Brien

Constraining ²⁶Al + p Resonances using ²⁶Al(³He, d)²⁷Si

NUCLEAR REACTIONS ²⁶Al(³He, d), E=20 MeV; measured σ(Ed), σ(θ); deduced implications for ²⁶Al(p, γ) stellar reaction rate, model parameters. ²⁷Si deduced levels, resonance, spectroscopic factors.

doi: 10.1103/PhysRevC.53.1945
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0102.

1995HO25      Nucl.Instrum.Methods Phys.Res. B99, 346 (1995)

M.A.Hofstee, J.C.Blackmon, A.E.Champagne, N.P.T.Bateman, P.D.Parker, K.Yildiz, B.M.Young, R.B.Vogelaar, M.S.Smith, A.J.Howard

Investigating the Astrophysically Important E(x) = 2.646 MeV State in ²⁰Na

NUCLEAR REACTIONS ²⁰Ne(³He, t), E=27 MeV; measured triton spectra, tγ-coin. ²⁰Na level deduced Γγ/Γ.

doi: 10.1016/0168-583X(95)00307-X
Citations: PlumX Metrics

1993HO10      Nucl.Instrum.Methods Phys.Res. B73, 53 (1993)

A.J.Howard

Measurement of ²²⁰Rn and ²²²Rn Emanation Rates for Solids

RADIOACTIVITY ^220,222Rn(α); measured Eα, Iα; deduced emanation rates. Electrostatic precipitation rates.

doi: 10.1016/0168-583X(93)96053-F
Citations: PlumX Metrics

1993HO16      Nucl.Instrum.Methods Phys.Res. A325, 224 (1993)

A.J.Howard, W.P.Strange

Prototypical Search for Radioactive Superheavy Elements in Gases

RADIOACTIVITY ²⁴¹Am, ^212,214,218Po(α); measured α-particle count vs time; deduced prototypical device application to superheavy element searches in atmosphere or isolated gases components. Electrostatic precipitation devices.

doi: 10.1016/0168-9002(93)91024-H
Citations: PlumX Metrics

1992SM03      Nucl.Phys. A536, 333 (1992)

M.S.Smith, P.V.Magnus, K.I.Hahn, A.J.Howard, P.D.Parker, A.E.Champagne, Z.Q.Mao

A High-Resolution Study of the ²⁰Ne(³He, t)²⁰Na Reaction and the ¹⁹Ne(p, γ)²⁰Na Reaction Rate

NUCLEAR REACTIONS ²⁰Ne(³He, t), E=29.7 MeV; measured triton spectra; calculated temperature dependence of stellar ¹⁹Ne(p, γ)²⁰Na reaction rate. ²⁰Na deduced levels, Γ. Implanted targets, magnetic spectrograph.

doi: 10.1016/0375-9474(92)90386-X
Citations: PlumX Metrics

1991HO09      Nucl.Phys. A528, 298 (1991)

A.J.Howard, T.S.Moise, A.E.Champagne, P.V.Magnus, M.S.Smith

Measurements of Differential Cross-Section Ratios for Single-Nucleon Transfer Reaction Pairs Near A = 25

NUCLEAR REACTIONS ²²Ne, ^24,26Mg(³He, d), E=20.2 MeV; measured σ(Ed); ²²Ne, ^24,26Mg(α, t), E=34.8 MeV; measured σ(Et). ²³Na, ^25,27Al deduced levels, σ(Ed)/σ(Et). ²⁴Mg(d, p), E=17.5 MeV; measured σ(Ep). ²⁴Mg(α, ³He), E=34.8 MeV; measured σ(E(³He)). ²⁵Mg deduced levels, σ(Ep)/σ(E(³He)).

doi: 10.1016/0375-9474(91)90091-J
Citations: PlumX Metrics

1990CH41      Phys.Rev. C42, 2730 (1990)

A.E.Champagne, A.J.Howard, Z.Q.Mao

²²Ne(d, p)²³Ne Reaction and Neutron Balance in the s Process

NUCLEAR REACTIONS ²²Ne(d, p), E=24.1 MeV; measured σ(θ); deduced (n, γ) mechanism, rate. ²³Ne levels deduced spectroscopic factors, Γn.

doi: 10.1103/PhysRevC.42.2730
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0459.

1990MA05      Nucl.Phys. A506, 332 (1990)

P.V.Magnus, M.S.Smith, A.J.Howard, P.D.Parker, A.E.Champagne

Measurement of ¹⁵O(α, γ)¹⁹Ne Resonance Strengths

NUCLEAR REACTIONS ¹⁹F(³He, t), E=29.8 MeV; measured σ(Et), αt-coin. ¹⁹Ne levels deduced α-branching ratios. Magnetic spectrograph.

doi: 10.1016/0375-9474(90)90390-8
Citations: PlumX Metrics

1989CH44      Nucl.Phys. A505, 384 (1989)

A.E.Champagne, A.J.Howard, M.S.Smith, P.V.Magnus, P.D.Parker

The Effect of Weak Resonances on the ²⁵Mg(p, γ)²⁶Al Reaction Rate

NUCLEAR REACTIONS, ICPND ²⁵Mg(³He, d), E=20.2 MeV; measured σ(θd); deduced ²⁵Mg(p, γ) reaction rate temperature dependence. ²⁶Al levels deduced S, Γp, resonance strengths. Enriched target.

doi: 10.1016/0375-9474(89)90382-5
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1321.

1989WA19      Nucl.Phys. A499, 546 (1989)

T.F.Wang, A.E.Champagne, J.D.Hadden, P.V.Magnus, M.S.Smith, A.J.Howard, P.D.Parker

Proton Threshold States in ²⁷Si and the Destruction of ²⁶Al at Low Stellar Temperatures

NUCLEAR REACTIONS ²⁷Al(³He, t), E=22.5, 26.3 MeV; measured σ(Et); ²⁸Si(³He, α), E=22.4 MeV; measured σ(θ). ²⁶Mg(³He, d), E=20.2 MeV; measured σ(θ). ²⁶Mg(α, t), E=34.8 MeV; measured σ(Et); deduced ²⁶Al(p, γ)²⁷Si reaction rates. ²⁷Al, ²⁷Si deduced levels. Enriched ²⁶Mg target, magnetic spectrograph.

doi: 10.1016/0375-9474(89)90545-9
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1324.

1986CH09      Nucl.Phys. A451, 498 (1986)

A.E.Champagne, A.B.McDonald, T.F.Wang, A.J.Howard, P.V.Magnus, P.D.Parker

Threshold States in ²⁶Al Revisited

NUCLEAR REACTIONS ²⁷Al(³He, α), ²⁵Mg(³He, d), E=20 MeV; measured σ(E), dγ-coin. ²⁶Al deduced levels, Γp. Enriched target.

doi: 10.1016/0375-9474(86)90073-4
Citations: PlumX Metrics

1984OS03      Nucl.Phys. A419, 115 (1984)

J.L.Osborne, C.A.Barnes, R.W.Kavanagh, R.M.Kremer, G.J.Mathews, J.L.Zyskind, P.D.Parker, A.J.Howard

Low-energy behavior of the ³He(α, γ)⁷Be cross section

NUCLEAR REACTIONS, ICPND ³He(α, γ), E=165-1169 keV; measured σ(E), Eγ, γ-branching ratio. ³He(α, γ), E(cm)=947, 1255 keV; measured σ(E). Enriched target.

doi: 10.1016/0375-9474(84)90288-4
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0737.

1983CH17      Nucl.Phys. A402, 159 (1983)

A.E.Champagne, A.J.Howard, P.D.Parker

Threshold States in ²⁶Al (I). Experimental Investigations

NUCLEAR REACTIONS ²⁵Mg(³He, d), (³He, ³He), ²⁶Mg(α, α'), E=20 MeV; ²⁵Mg(d, p), E=10 MeV; ²⁷Al(³He, α), E=8.25 MeV; ²⁴Mg(³He, p), E=6.9 MeV; measured σ(θd), σ(θp), σ(E, Eα), σ(θ), αγ-, pγ-coin, Eγ. ²⁶Al, ^26,25Mg deduced levels, J, π, L, S. Enriched target.

doi: 10.1016/0375-9474(83)90566-3
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1203.

1983CH18      Nucl.Phys. A402, 179 (1983)

A.E.Champagne, A.J.Howard, P.D.Parker

Threshold States in ²⁶Al: (II). Extraction of Resonance Strengths

NUCLEAR REACTIONS ²⁵Mg(p, γ), E=386-393 keV; measured σ(E). ²⁶Al resonances deduced Γ, resonance strengths. R-matrix analysis.

doi: 10.1016/0375-9474(83)90567-5
Citations: PlumX Metrics

1982OS02      Phys.Rev.Lett. 48, 1664 (1982)

J.L.Osborne, C.A.Barnes, R.W.Kavanagh, R.M.Kremer, G.J.Mathews, J.L.Zyskind, P.D.Parker, A.J.Howard

Low-Energy ³He(α, γ)⁷Be Cross-Section Measurements

NUCLEAR REACTIONS, ICPND ³He(α, γ), E(cm)=165-1170 keV; measured absolute σ vs E, γ-branching ratio; deduced zero-energy intercept. Activation technique, ³He gas target.

doi: 10.1103/PhysRevLett.48.1664
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetA0155.

1975PA08      Nucl.Phys. A250, 309 (1975)

P.D.Parker, A.J.Howard, D.R.Goosman

The ³⁸Ar(p, d)³⁷Ar Reaction

NUCLEAR REACTIONS ³⁸Ar(p, d), E=26 MeV; measured σ(Ed, θ). ³⁷Ar deduced levels, J, π, C²S. DWBA analysis.

doi: 10.1016/0375-9474(75)90261-4
Citations: PlumX Metrics

1974HO39      Astrophys.J. 188, 131 (1974)

A.J.Howard, H.B.Jensen, M.Rios, W.A.Fowler, B.A.Zimmerman

Measurement and Theoretical Analysis of Some Reaction Rates of Interest in Silicon Burning

NUCLEAR REACTIONS ²⁷Al, ³⁵Cl, ⁴⁶Ti(α, n), ⁴⁰Ca(α, p), ⁴⁵Sc(p, n), E(cm) ≈ 4-10 MeV; measured σ. Comparison with model predictions, astrophysical implications discussed.

doi: 10.1086/152694
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0180.

1973NE12      Nucl.Phys. A210, 60 (1973)

A.V.Nero, A.J.Howard

¹⁶O(p, α₀)¹³N Cross-Section Measurements

NUCLEAR REACTIONS ¹⁶O(p, α), E(cm)=5.4-9.9 MeV; measured σ(E).

doi: 10.1016/0375-9474(73)90503-4
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1103.

1972HO52      Nuovo Cim. 11A, 575 (1972)

A.J.Howard, R.G.Hirko, D.A.Bromley, K.Bethge, J.W.Olness

A Study of ²²Ne via the ²⁰Ne(t, pγ)²²Ne Reaction

NUCLEAR REACTIONS ²⁰Ne(t, pγ), E=3 MeV; measured σ(Ep, Eγ, θ(pγ)). ²²Ne deduced levels, J, π.

doi: 10.1007/BF02729464
Citations: PlumX Metrics

1972LI02      Nucl.Phys. A180, 1 (1972)

R.A.Lindgren, R.G.Hirko, J.G.Pronko, A.J.Howard, M.W.Sachs, D.A.Bromley

A Study of ²³Na

NUCLEAR REACTIONS ²³Na(α, α'γ), ²⁶Mg(p, αγ), Eα=16.85 MeV, Ep=14.25 MeV; measured αγ(θ), pγ(θ), Iγ. ²³Na levels deduced J, branching, multipole mixing ratios. Enriched ²⁶Mg target.

doi: 10.1016/0375-9474(72)90152-2
Citations: PlumX Metrics

1971CH09      Nucl.Phys. A164, 307 (1971)

J.W.Champlin, A.J.Howard, J.W.Olness

Studies of ³⁷Ar via the ³⁶Ar(d, pγ)³⁷Ar Reaction

NUCLEAR REACTIONS ³⁶Ar(d, pγ), E=2.800, 2.975, 3.100 MeV; measured Eγ, Iγ, pγ(θ). ³⁷Ar deduced levels, γ-branching, J, γ-mixing(E2/M1). Enriched gas target.

doi: 10.1016/0375-9474(71)90216-8
Citations: PlumX Metrics

1971HI05      Particles and Nuclei 1, 372 (1971)

R.G.Hirko, R.A.Lindgren, A.J.Howard, J.G.Pronko, M.W.Sachs, D.A.Bromley

Nuclear Structure Studies on ²⁹Al

NUCLEAR REACTIONS ²⁷Al(t, p), E=3.34 MeV; measured σ(Ep, θ). ²⁶Mg(α, pγ), E=13.82, 14 MeV; measured σ(Ep, Eγ, θ(γ), θ(pγ)). ²⁹Al deduced levels, J, π, γ-mixing, γ-branching.

1971ME12      Phys.Rev. C4, 1778 (1971)

M.C.Mermaz, C.A.Whitten, Jr., J.W.Champlin, A.J.Howard, D.A.Bromley

Study of the (d, p) Reaction on ²⁸Si, ³²S, and ³⁶Ar at E = 18.00 MeV

NUCLEAR REACTIONS ²⁸Si, ³²S, ³⁶Ar(d, p), E=18 MeV; measured σ(Ep, θ). ²⁹Si, ³³S, ³⁷Ar deduced levels, J, π, L(n), S.

doi: 10.1103/PhysRevC.4.1778
Citations: PlumX Metrics

1970HO17      Phys.Rev. C1, 1446 (1970)

A.J.Howard, R.G.Hirko, D.A.Bromley, K.Bethge, J.W.Olness

Studies of the Low-Lying Levels of Ne²⁴

NUCLEAR REACTIONS ²²Ne(t, pγ), E=3.3 MeV; measured σ(Ep, Eγ, θ(pγ)). ²⁴Ne levels deduced L, J, π.

doi: 10.1103/PhysRevC.1.1446
Citations: PlumX Metrics

1970HO19      Nucl.Phys. A150, 609 (1970)

A.J.Howard, J.G.Pronko, R.G.Hirko

Studies on the ²¹Ne(p, d)²⁰Ne and ²¹Ne(d, p)²²Ne Reactions

NUCLEAR REACTIONS ²¹Ne(p, d), E=20.0 MeV. ²¹Ne(d, p), E=10.2 MeV; measured σ(Ed, θ), σ(Ep, θ). ²⁰Ne, ²²Ne deduced levels, J, π, L(n), S. Enriched gas target.

doi: 10.1016/0375-9474(70)90421-5
Citations: PlumX Metrics

1970HO22      Nucl.Phys. A152, 317 (1970)

A.J.Howard, J.G.Pronko, C.A.Whitten, Jr.

Studies on ²¹Ne and ²³Ne via the ²⁰Ne(d, p)²¹Ne and ²²Ne(d, p)²³Ne Reactions

NUCLEAR REACTIONS ^20,22Ne(d, p), E=16.4, 12.1 MeV; measured σ(Ep, θ). ²¹Ne, ²³Ne deduced levels, J, π, L(n), S. Enriched gas targets.

doi: 10.1016/0375-9474(70)90833-X
Citations: PlumX Metrics

1970LI08      Phys.Lett. 32B, 103 (1970)

R.A.Lindgren, J.G.Pronko, A.J.Howard, D.A.Bromley

The Identification of Mirror State Structure in ²¹Na and ²¹Ne

NUCLEAR REACTIONS ²⁴Mg(p, α); E=17.5 MeV; measured σ(Eα, Ep), αp(θ). ²¹Na levels deduced J.

doi: 10.1016/0370-2693(70)90598-8
Citations: PlumX Metrics

1969HO26      Phys.Rev. 184, 1094 (1969)

A.J.Howard, J.G.Pronko, C.A.Whitten, Jr.

Low-Lying Negative-Parity States in Ne²¹

NUCLEAR REACTIONS ²⁰Ne(d, p), E = 16.4 MeV; ²²Ne(p, d), E = 20 MeV; measured σ(Ep, θ), σ(Ed, θ). ²¹Ne deduced levels, L(n), S, J, π.

doi: 10.1103/PhysRev.184.1094
Citations: PlumX Metrics

1968CH42      Bull.Am.Phys.Soc. 13, No.4, 675 HF13 (1968)

J.W.Champlin, A.J.Howard, J.W.Olness

Excitation-Energy Measurements on the Ar³⁷ - K³⁷ Mirror Pair

NUCLEAR REACTIONS ³⁶Ar(d, p), (d, n), E=2.8-3.5 MeV; measured Eγ, Iγ with GeLi detector at 0 deg and 90 deg in ³⁷Ar, ³⁷K.

1967AL02      Phys.Rev. 154, 1058 (1967)

J.P.Allen, A.J.Howard, D.A.Bromley, J.W.Olness, E.K.Warburton

Studies of Ar⁴¹ from the Ar⁴⁰(d, pγ)Ar⁴¹ Reaction

NUCLEAR STRUCTURE ⁴¹Ar; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.154.1058
Citations: PlumX Metrics

1967HO08      Phys.Rev. 154, 1067 (1967)

A.J.Howard, J.P.Allen, D.A.Bromley, J.W.Olness, E.K.Warburton

Studies on the Ne²²(d, pγ)Ne²³ Reaction

NUCLEAR STRUCTURE ²³Ne; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.154.1067
Citations: PlumX Metrics

1967HO10      Phys.Rev. 157, 1022(1967)

A.J.Howard, J.P.Allen, D.A.Bromley, J.W.Olness, E.K.Warburton

Studies of Some Low-Lying Levels of Ne²¹

NUCLEAR REACTIONS ²⁰Ne(d, pγ), E= < 4 MeV; measured σ(Ep, Eγ, θ(p), θ(pγ)). ²¹Ne deduced levels, J, π, branching ratios, γ-multipolarity.

doi: 10.1103/PhysRev.157.1022
Citations: PlumX Metrics

1965AL13      Nucl.Phys. 68, 426 (1965)

J.P.Allen, A.J.Howard, D.A.Bromley, J.W.Olness

The Low Levels of O¹⁹

NUCLEAR REACTIONS ¹⁸O(d, pγ)¹⁹O, E = 2.2, 2.5 MeV; measured γ, pγ-coin, γγ(θ). ¹⁹O deduced levels, J, π.

doi: 10.1016/0029-5582(65)90659-0
Citations: PlumX Metrics

1965AL20      Phys.Rev. 140, B1245 (1965)

J.P.Allen, A.J.Howard, D.A.Bromley, J.W.Olness

Studies on F¹⁹ in the O¹⁸(p, γ)F¹⁹ Reaction

NUCLEAR STRUCTURE ¹⁸O, ¹⁹F; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.140.B1245
Citations: PlumX Metrics

1965HO03      Phys.Rev. 137, B32 (1965)

A.J.Howard, D.A.Bromley, E.K.Warburton

Studies on the Ne²⁰(d, pγ)Ne²¹ Reaction

NUCLEAR STRUCTURE ²¹Ne; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.137.B32
Citations: PlumX Metrics

1964AL02      Bull. Am. Phys. Soc. 9, No. 1, 68, GC11 (1964)

J.P.Allen, A.J.Howard, D.A.Bromley, J.W.Olness

Character of the 3.91-MeV State in F¹⁹

NUCLEAR STRUCTURE ¹⁸O; measured not abstracted; deduced nuclear properties.

1964AL06      Bull. Am. Phys. Soc. 9, No. 4, 440, FA12 (1964)

J.P.Allen, A.J.Howard, D.A.Bromley

Studies on the Low-Lying Levels of ³⁷Ar

NUCLEAR STRUCTURE ³⁷Ar; measured not abstracted; deduced nuclear properties.

1964HO01      Bull.Am.Phys.Soc. 9, No.1, 68, GC12 (1964)

A.J.Howard, J.P.Allen, D.A.Bromley, J.W.Olness

2.08-MeV Level in Na²³

NUCLEAR STRUCTURE ²³Ne; measured not abstracted; deduced nuclear properties.

1964HO04      Bull.Am.Phys.Soc. 9, No.4, 439, FA4 (1964)

A.J.Howard, D.A.Bromley

γ Deexcitation Studies on the Low Levels of ²³Ne

NUCLEAR STRUCTURE ²³Ne; measured not abstracted; deduced nuclear properties.

1963HO02      Bull.Am.Phys.Soc. 8, No.1, 47, NA1 (1963)

A.J.Howard, D.A.Bromley, E.K.Warburton

γ-De-Excitation Studies on the Low Levels of the Mass-21 System

NUCLEAR STRUCTURE ²¹Ne, ²¹Na; measured not abstracted; deduced nuclear properties.

1963HO10      Thesis, Yale University (1963)

A.J.Howard, Jr.

Studies on the Mass 21 System

NUCLEAR STRUCTURE ²¹Ne, ²¹Na; measured not abstracted; deduced nuclear properties.

1963MC01      Bull.Am.Phys.Soc. 8, No.1, 47, NA3 (1963)

C.L.McClelland, J.Lowe, A.J.Howard

Lifetime of the 1st-Excited State of Ne²³

NUCLEAR STRUCTURE ²³Ne; measured not abstracted; deduced nuclear properties.