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NSR database version of April 11, 2024.

Search: Author = M.E.Howard

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2022JO01      Phys.Rev. C 105, 024602 (2022)

K.L.Jones, A.Bey, S.Burcher, J.M.Allmond, A.Galindo-Uribarri, D.C.Radford, S.Ahn, A.Ayres, D.W.Bardayan, J.A.Cizewski, R.F.Garcia Ruiz, M.E.Howard, R.L.Kozub, J.F.Liang, B.Manning, M.Matos, C.D.Nesaraja, P.D.O'Malley, E.Padilla-Rodal, S.D.Pain, S.T.Pittman, A.Ratkiewicz, K.T.Schmitt, M.S.Smith, D.W.Stracener, R.L.Varner

Neutron transfer reactions on the ground state and isomeric state of a 130Sn beam

NUCLEAR REACTIONS 9Be, 13C(130Sn, 131Sn), E=520 MeV [secondary 130Sn and 130mSn beams from U(p, F)]; measured reaction products, Eγ, Iγ, Eα, αα-coin, αγ-coin, ααγ-coin. 131Sn; deduced levels, J, π, improved energy values for 1p-2h states. Discussed the probability of one-neutron transfer from the 7- isomeric state in 130Sn. CLARION array of 11 Compton-suppressed HPGe clover detectors combined with BareBall CsI(Tl) array at HRIBF.

doi: 10.1103/PhysRevC.105.024602
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2022KI05      Phys.Rev. C 105, 025801 (2022)

C.H.Kim, K.Y.Chae, S.Ahn, D.W.Bardayan, K.A.Chipps, J.A.Cizewski, M.E.Howard, R.L.Kozub, M.S.Kwag, K.Kwak, B.Manning, M.Matos, P.D.O'Malley, S.D.Pain, W.A.Peters, S.T.Pittman, A.Ratkiewicz, M.S.Smith, S.Strauss

Proton branching ratios of 23Mg levels

NUCLEAR REACTIONS 24Mg(p, d), E=31 MeV; measured Ep, Ip, deuteron spectra, (deuteron)p-coin; deduced proton branchings from excited states in 23Mg to the levels of 22Na. Discussed the impact of measured proton branchings on the estimation of 22Na(p, γ) reaction rate. A large-area silicon detector array (SIDAR) at HRIBF.

doi: 10.1103/PhysRevC.105.025801
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2021BA34      Phys.Rev. C 104, 024308 (2021)

J.C.Batchelder, C.Apgar, N.T.Brewer, C.J.Gross, R.K.Grzywacz, S.Ilyushkin, M.Madurga, K.Miernik, S.W.Padgett, S.V.Paulauskas, W.A.Peters, B.C.Rasco, K.P.Rykaczewski, D.W.Stracener, J.A.Winger, M.Wolinska-Cichocka, E.F.Zganjar, D.W.Bardayan, M.E.Howard, B.Manning, M.Matos, A.J.Mendez, D.Miller, A.Ratkiewicz, E.H.Wang

Levels in 125Cd populated by the β decay of 125mAg and 125Ag

RADIOACTIVITY 125,125mAg(β-), (β-n)[from 238U(p, F), E=50 MeV from the ORIC cyclotron at the HRIBF-ORNL facility, followed by mass separation of fission fragments by a high resolution magnet]; 124Cd(β-)[from 125Cd β-n decay]; measured Eγ, Iγ, βγ- and γγ-coin, half-lives of decays of the g.s. and isomer of 125Ag, %β-n or Pn using two HPGe clover detectors for γ rays, two plastic scintillators for β particles, and 48 plastic scintillators for the detection of neutrons. 125Cd, 124In; deduced levels, J, π, multipolarity, β feedings, logft. Comparison with previously reported results.

doi: 10.1103/PhysRevC.104.024308
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2021KI05      Phys.Rev. C 104, 014323 (2021)

M.J.Kim, K.Y.Chae, S.Ahn, D.W.Bardayan, S.M.Cha, K.A.Chipps, J.A.Cizewski, M.E.Howard, R.L.Kozub, K.Kwak, B.Manning, M.Matos, P.D.O'Malley, S.D.Pain, W.A.Peters, S.T.Pittman, A.Ratkiewicz, M.S.Smith, S.Strauss

First measurement of proton decay from a transfer reaction to 21Na

NUCLEAR REACTIONS 24Mg(p, α)21Na*, E=31 MeV; analyzed Eα, Iα, light charged particles, particle identification plot, α(protons from the decay of excited stated in 21Na)-coin, a follow-up analysis of previously reported experiment in 2017Ch34 using silicon detector array SIDAR at HRIBF-ORNL facility. 21Na; deduced levels, proton branching ratios from decay of levels in 21Na to the ground and first excited states of 20Ne assuming isotropic decays. 21Mg(β+), (β+p); compared previously known experimental delayed proton branches from levels in 21Na populated in β+ decay of 21Mg with those from the transfer reaction in the present analysis.

doi: 10.1103/PhysRevC.104.014323
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2020KW01      Eur.Phys.J. A 56, 108 (2020)

M.S.Kwag, K.Y.Chae, S.Ahn, D.W.Bardayan, K.A.Chipps, J.A.Cizewski, M.E.Howard, R.L.Kozub, K.Kwak, B.Manning, M.Matos, P.D.O'Malley, S.D.Pain, W.A.Peters, S.T.Pittman, A.Ratkiewicz, M.S.Smith, S.Strauss

Spin assignments for 23Mg levels and the astrophysical 22Na(p, γ)23Mg reaction

NUCLEAR REACTIONS 24Mg(p, d), E=31 MeV; measured reaction products. 23Mg, 22Na; deduced σ(θ), excitation energies and J, π for levels, resonance parameters and astrophysical reaction rates for 22Na+p. Comparison with available data, DWBA calculations. Large-area SIlicon Detector ARray (SIDAR). The Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory (ORNL).

doi: 10.1140/epja/s10050-020-00106-y
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2019AH05      Phys.Rev. C 100, 044613 (2019)

S.Ahn, D.W.Bardayan, K.L.Jones, A.S.Adekola, G.Arbanas, J.C.Blackmon, K.Y.Chae, K.A.Chipps, J.A.Cizewski, S.Hardy, M.E.Howard, R.L.Kozub, B.Manning, M.Matos, C.D.Nesaraja, P.D.O'Malley, S.D.Pain, W.A.Peters, S.T.Pittman, B.C.Rasco, M.S.Smith, I.Spassova

Direct neutron capture cross section on 80Ge and probing shape coexistence in neutron-rich nuclei

NUCLEAR REACTIONS 2H(80Ge, p), (80Ge, d), E=310 MeV; measured energies and angles of light-ion ejectiles, Ep, Ip, E(d), I(d), (80Ge)p- and (80Ge)d-coin, angular distributions of ejected proton using various silicon detectors at the Holifield Radioactive Ion Beam Facility at ORNL. Proton angular distributions analyzed using adiabatic wave approximation including finite range effects (ADWAFR) using FRESCO code, and by DWBA. 81Ge; deduced levels, J, π, spectroscopic factors, configurations, region of shape coexistence around N≈50. Systematics of low-lying levels in N=49 isotones 81Ge, 83Se, 85Kr and 87Sr. Discussed implications for the magic nature of 78Ni. 80Ge(n, γ), E=0.01-3 MeV; calculated σ(E) for r-process simulations using direct-semidirect (DSD) model and the CUPIDO code.

doi: 10.1103/PhysRevC.100.044613
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2019MA26      Phys.Rev. C 99, 041302 (2019); Erratum Phys.Rev. C 99, 069901 (2019)

B.Manning, G.Arbanas, J.A.Cizewski, R.L.Kozub, S.Ahn, J.M.Allmond, D.W.Bardayan, K.Y.Chae, K.A.Chipps, M.E.Howard, K.L.Jones, J.F.Liang, M.Matos, C.D.Nesaraja, F.M.Nunes, P.D.O'Malley, S.D.Pain, W.A.Peters, S.T.Pittman, A.Ratkiewicz, K.T.Schmitt, D.Shapira, M.S.Smith, L.Titus

Informing direct neutron capture on tin isotopes near the N=82 shell closure

NUCLEAR REACTIONS 2H(124Sn, p), (126Sn, p), (128Sn, p), E=630 MeV; measured Ep, Ip, (recoils)p-coin, Q-value spectra, differential σ(θ) using Super Oak Ridge Rutgers University Barrel Array (SuperORRUBA) for light charged particle detection and ionization chamber for detection of beam intensity and recoils at Oak Ridge National Laboratory. 125,127,129Sn; deduced levels, Jπ, L-transfers, spectroscopic factors. 2H(130Sn, p), (132Sn, p); reanalyzed previous experimental data. Angular distribution data compared with Finite Range Adiabatic Wave Approximation. 124,126,128,130,132Sn(n, γ), E=30 keV; calculated direct-semidirect σ(n, γ) from spectroscopic information, and compared with various theoretical predictions. Relevance to r-process abundance calculations.

doi: 10.1103/PhysRevC.99.041302
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2018OR03      Phys.Lett. B 785, 615 (2018)

R.Orlandi, S.D.Pain, S.Ahn, A.Jungclaus, K.T.Schmitt, D.W.Bardayan, W.N.Catford, R.Chapman, K.A.Chipps, J.A.Cizewski, C.G.Gross, M.E.Howard, K.L.Jones, R.L.Kozub, B.Manning, M.Matos, K.Nishio, P.D.O'Malley, W.A.Peters, S.T.Pittman, A.Ratkiewicz, C.Shand, J.F.Smith, M.S.Smith, T.Fukui, J.A.Tostevin, Y.Utsuno

Neutron-hole states in 131Sn and spin-orbit splitting in neutron-rich nuclei

NUCLEAR STRUCTURE 131,132,133Sn; analyzed available data; deduced spectroscopic factors, a significant reduction of the energy splitting of the weakly bound 3p orbits compared to the well-bound 2d orbits; calculated energy splitting using a one-body spin-orbit interaction and a Woods–Saxon potential of standard radius and diffuseness.

NUCLEAR REACTIONS 2H(132Sn, t)131Sn, E ∼ 4.4 MeV/nucleon; measured reaction products; deduced σ(θ), orbital angular momentum, energy levels, J, π.

doi: 10.1016/j.physletb.2018.08.005
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2017CH34      Phys.Rev. C 96, 025810 (2017)

S.M.Cha, K.Y.Chae, S.Ahn, D.W.Bardayan, K.A.Chipps, J.A.Cizewski, M.E.Howard, R.L.Kozub, K.Kwak, B.Manning, M.Matos, P.D.O'Malley, S.D.Pain, W.A.Peters, S.T.Pittman, A.Ratkiewicz, M.S.Smith, S.Strauss

Spectroscopic study of the radionuclide 21Na for the astrophysical 17F (α, p) 20Ne reaction rate

NUCLEAR REACTIONS 24Mg(p, α)21Na, E=31 MeV; measured particle spectra, Eα, Iα, σ(θ) using annular silicon strip detector array at the ORNL Holifield Radioactive Ion Beam Facility. 21Na; deduced levels, proton resonances, J, π, L-transfers by DWBA analysis, Γα and resonance strengths of proton resonances. Comparison with previous experimental data as in the Nuclear Data Sheets. 17F(α, p)20Ne, T=0.1-1.1 GK; deduced astrophysical reaction rates, and compared with previous values, and with REACLIB compilation.

doi: 10.1103/PhysRevC.96.025810
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2016CE01      Phys.Rev. C 93, 021601 (2016)

G.Cerizza, A.Ayres, K.L.Jones, R.Grzywacz, A.Bey, C.Bingham, L.Cartegni, D.Miller, S.Padgett, T.Baugher, D.Bazin, J.S.Berryman, A.Gade, S.McDaniel, A.Ratkiewicz, A.Shore, S.R.Stroberg, D.Weisshaar, K.Wimmer, R.Winkler, S.D.Pain, K.Y.Chae, J.A.Cizewski, M.E.Howard, J.A.Tostevin

Structure of 107Sn studied through single-neutron knockout reactions

NUCLEAR REACTIONS 9Be(108Sn, 107Sn), (106Sn, 105Sn), E=80 MeV/nucleon, [secondary 106,108Sn beams from 9Be(124Xe, X), E=140 MeV/nucleon primary reaction using A1900 separator at NSCL-MSU]; measured yields of reaction products, Eγ, Iγ, (107Sn)γ-coin, momentum distributions, cross sections using CAESAR array of 192 CsI(Na) crystals for γ rays and particle identification by TOF, ΔE-E measured in the S800 focal-plane ion chamber. 107Sn; deduced levels, J, π. Comparison of experimental momentum distribution with eikonal model reaction calculations for neutron removal. Shell-model calculations of cross sections and spectroscopic factors. 105Sn; see 2015Jo03 (reference 20 in present paper) for experimental results.

doi: 10.1103/PhysRevC.93.021601
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2016MA50      Phys.Rev.Lett. 117, 092502 (2016)

M.Madurga, S.V.Paulauskas, R.Grzywacz, D.Miller, D.W.Bardayan, J.C.Batchelder, N.T.Brewer, J.A.Cizewski, A.Fijalkowska, C.J.Gross, M.E.Howard, S.V.Ilyushkin, B.Manning, M.Matos, A.J.Mendez, II, K.Miernik, S.W.Padgett, W.A.Peters, B.C.Rasco, A.Ratkiewicz, K.P.Rykaczewski, D.W.Stracener, E.H.Wang, M.Wolinska-Cichocka, E.F.Zganjar

Evidence for Gamow-Teller Decay of 78Ni Core from Beta-Delayed Neutron Emission Studies

RADIOACTIVITY 83,84Ga(β-), (β-n) [from 238U(p, X), E not given]; measured decay products, En, In, Eγ, Iγ. 78Ni; deduced β-decay strength, strong multineutron emission probabilities, β-decay lifetimes. Shell model calculations, neutron time-of-flight technique.

doi: 10.1103/PhysRevLett.117.092502
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2015AL24      Phys.Rev. C 92, 041303 (2015)

J.M.Allmond, A.E.Stuchbery, A.Galindo-Uribarri, E.Padilla-Rodal, D.C.Radford, J.C.Batchelder, C.R.Bingham, M.E.Howard, J.F.Liang, B.Manning, S.D.Pain, N.J.Stone, R.L.Varner, C.-H.Yu

Investigation into the semimagic nature of the tin isotopes through electromagnetic moments

NUCLEAR REACTIONS C, Ti(112Sn, 112Sn'), (114Sn, 114Sn'), (116Sn, 116Sn'), (118Sn, 118Sn'), (120Sn, 120Sn'), (122Sn, 122Sn'), (124Sn, 124Sn'), E=2.9 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin, (particle)γ(θ), absolute cross sections using CLARION Ge array, BareBall CsI array, and a Bragg curve detector at HRIBF-ORNL. 112,114,116,118,120,122,124Sn; deduced E2 matrix elements, B(E2), quadrupole moments, g-factors for the first 2+ states. Coulomb excitation and GOSIA analysis. Comparison with shell model calculations, and several previous experimental measurements. Systematic differences found between results from the present experiment and a recent experiment using DSAM technique.

doi: 10.1103/PhysRevC.92.041303
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2015CH66      J.Korean Phys.Soc. 67, 1435 (2015)

S.M.Cha, K.Y.Chae, A.Kim, E.J.Lee, S.Ahn, D.W.Bardayan, K.A.Chipps, J.A.Cizewski, M.E.Howard, B.Manning, P.D.O'Malley, A.Ratkiewicz, S.Strauss, R.L.Kozub, M.Matos, S.D.Pain, S.T.Pittman, M.S.Smith, W.A.Peters

24Mg(p, α)21Na reaction study for spectroscopy of 21Na

NUCLEAR REACTIONS 24Mg(p, α), E=31 MeV; measured reaction products, Eα, Iα; deduced α-particles yields, σ(θ), new energy level in 21Na. Comparison with theoretical calculations.

doi: 10.3938/jkps.67.1435
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2015JO03      Acta Phys.Pol. B46, 537 (2015)

K.L.Jones, S.Ahn, J.M.Allmond, A.Ayres, D.W.Bardayan, T.Baugher, D.Bazin, J.S.Berryman, A.Bey, C.Bingham, L.Cartegni, G.Cerizza, K.Y.Chae, J.A.Cizewski, A.Gade, A.Galindo-Uribarri, R.F.Garcia Ruiz, R.Grzywacz, M.E.Howard, R.L.Kozub, J.F.Liang, B.Manning, M.MatoS, S.McDaniel, D.Miller, C.D.Nesaraja, P.D.O'Malley, S.Padgett, E.Padilla-Rodal, S.D.Pain, S.T.Pittman, D.C.Radford, A.Ratkiewicz, K.T.Schmitt, A.Shore, M.S.Smith, D.W.Stracener, S.R.Stroberg, J.Tostevin, R.L.Varner, D.Weisshaar, K.Wimmer, R.Winkler

Recent Direct Reaction Experimental Studies with Radioactive Tin Beams

doi: 10.5506/APhysPolB.46.537
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2014AL07      Phys.Rev.Lett. 112, 172701 (2014)

J.M.Allmond, E.S.Stuchbery, J.R.Beene, A.Galindo-Uribarri, J.F.Liang, E.Padilla-Rodal, D.C.Radford, R.L.Varner, A.Ayres, J.C.Batchelder, A.Bey, C.R.Bingham, M.E.Howard, K.L.Jones, B.Manning, P.E.Mueller, C.D.Nesaraja, S.D.Pain, W.A.Peters, A.Ratkiewicz, K.T.Schmitt, D.Shapira, M.S.Smith, N.J.Stone, D.W.Stracener, C.-H.Yu

Double-Magic Nature of 132Sn and 208Pb through Lifetime and Cross-Section Measurements

NUCLEAR REACTIONS 9Be(132Sn, 8Be), (208Pb, 8Be), E=3 MeV/nucleon; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced energy levels, J, π, σ, level T1/2, B(M1), spectroscopic factors. Comparison with available data, DWBA calculations.

doi: 10.1103/PhysRevLett.112.172701
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2115. Data from this article have been entered in the XUNDL database. For more information, click here.


2014AL14      Phys.Rev. C 90, 014322 (2014)

J.M.Allmond, A.E.Stuchbery, B.A.Brown, J.R.Beene, A.Galindo-Uribarri, C.J.Gross, J.F.Liang, E.Padilla-Rodal, D.C.Radford, R.L.Varner, A.Ayres, J.C.Batchelder, A.Bey, C.R.Bingham, M.E.Howard, K.L.Jones, B.Manning, P.E.Mueller, C.D.Nesaraja, S.D.Pain, W.A.Peters, A.Ratkiewicz, K.T.Schmitt, D.Shapira, M.S.Smith, N.J.Stone, D.W.Stracener, C.-H.Yu

2π1ν states populated in 135Te from 9Be-induced reactions with a 132Sn beam

NUCLEAR REACTIONS 9Be(132Sn, nα), (132Sn, 2nα), (132Sn, 3nα), E=3 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin using HyBall and CLARION arrays at HRIBF-ORNL facility. 134,135,136Te; deduced levels, J, π. 135Te; deduced σ, spectroscopic factors, DWBA calculations, configurations. Comparison with shell model calculations for 134,135,136Te.

NUCLEAR STRUCTURE 134,135,136Te; calculated levels, J, π, wavefunctions, spectroscopic factors using shell model. Comparison with experimental data.

doi: 10.1103/PhysRevC.90.014322
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2014AL20      Phys.Rev. C 90, 034309 (2014)

J.M.Allmond, B.A.Brown, A.E.Stuchbery, A.Galindo-Uribarri, E.Padilla-Rodal, D.C.Radford, J.C.Batchelder, M.E.Howard, J.F.Liang, B.Manning, R.L.Varner, C.-H.Yu

High-precision B(E2) measurements of semi-magic 58, 60, 62, 64Ni by Coulomb excitation

NUCLEAR REACTIONS C(58Ni, 58Ni'), (60Ni, 60Ni'), (62Ni, 62Ni'), (64Ni, 64Ni'), E=1.8 MeV/nucleon; measured Eγ, Iγ, γγ-, (scattered Ni particle)γ-coin, (carbon recoils)γ(θ) using CLARION array for γ rays and CsI crystals for particles at HRIBF-ORNL facility. Coulomb excitation. 58,60,62,64Ni; deduced E2 matrix elements for first 2+ to 0+ transitions, B(E2). Comparison with large-basis shell-model calculations, and with other experimental results. Systematics of B(E2) values for first 2+ states in N=28 even-A isotones.

doi: 10.1103/PhysRevC.90.034309
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2014WI07      Phys.Rev. C 90, 064615 (2014)

K.Wimmer, D.Bazin, A.Gade, J.A.Tostevin, T.Baugher, Z.Chajecki, D.Coupland, M.A.Famiano, T.K.Ghosh, G.F.Grinyer, M.E.Howard, M.Kilburn, W.G.Lynch, B.Manning, K.Meierbachtol, P.Quarterman, A.Ratkiewicz, A.Sanetullaev, R.H.Showalter, S.R.Stroberg, M.B.Tsang, D.Weisshaar, J.Winkelbauer, R.Winkler, M.Youngs

Elastic breakup cross sections of well-bound nucleons

NUCLEAR REACTIONS 9Be(28Mg, 27Na), E=93 MeV/nucleon, [28Mg secondary beam from 9Be(40ar, X), E=140 MeV/nucleon primary reaction]; measured fragment spectra, (light charged particles)fragment-coin using A1900 fragment separator, S800 magnetic spectrograph and high-resolution array HiRA at NSCL-MSU facility; deduced missing-mass spectra of the one-proton removal reaction residues 7Be, 8B and 27Na, and percentage contributions to proton removal cross section from the elastic and inelastic nucleon removal mechanisms. Comparison of experimental breakup fractions with eikonal reaction model predictions, and previous experimental results.

doi: 10.1103/PhysRevC.90.064615
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2143.


2013ST24      Phys.Rev. C 88, 051304 (2013)

A.E.Stuchbery, J.M.Allmond, A.Galindo-Uribarri, E.Padilla-Rodal, D.C.Radford, N.J.Stone, J.C.Batchelder, J.R.Beene, N.Benczer-Koller, C.R.Bingham, M.E.Howard, G.J.Kumbartzki, J.F.Liang, B.Manning, D.W.Stracener, C.-H.Yu

Electromagnetic properties of the 2+1 state in 134Te: Influence of core excitation on single-particle orbits beyond 132Sn

NUCLEAR REACTIONS C(130Te, 130Te'), (134Te, 134Te'), E=390 MeV, also 343 MeV for 130Te; measured scattered particle spectra, Eγ, Iγ, (particle)γ-coin, (particle)γ(θ) using HyBall array for particles and Clarion array of Clover Ge detectors for γ rays at HRIBF-ORNL facility. Combined analysis of B(E2) from Coulomb excitation and g factor from recoil-in vacuum (RIV) method. 130,134Te; deduced level, B(E2) and g factors of first 2+ states. Comparison with previous experimental results, and with theoretical calculations. Systematics of g factors and B(E2) values for 130,132,134,136Te, and for first 2+, 4+ and 6+ states in 134Te.

NUCLEAR MOMENTS 134Te; measured g factor of first 2+ state by recoil-in vacuum (RIV) method in Coulomb excitation at HRIBF-ORNL facility. Combined analysis of Coulomb excitation and recoil-in vacuum (RIV) method. Systematics of g factors of first 2+ states in 130,132,134,136Te. Comparison with theoretical calculations.

doi: 10.1103/PhysRevC.88.051304
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2012EG03      Phys.Rev.Lett. 109, 202502 (2012)

I.A.Egorova, R.J.Charity, L.V.Grigorenko, Z.Chajecki, D.Coupland, J.M.Elson, T.K.Ghosh, M.E.Howard, H.Iwasaki, M.Kilburn, Jenny Lee, W.G.Lynch, J.Manfredi, S.T.Marley, A.Sanetullaev, R.Shane, D.V.Shetty, L.G.Sobotka, M.B.Tsang, J.Winkelbauer, A.H.Wuosmaa, M.Youngs, M.V.Zhukov

Democratic Decay of 6Be Exposed by Correlations

NUCLEAR REACTIONS Be(7Be, X)6Be, E=70 MeV/nucleon; measured reaction products, Eα, Iα, Ep, Ip; deduced three-body energy-angular correlations, three-body democratic decay. Comparison with a three-cluster-model calculations.

doi: 10.1103/PhysRevLett.109.202502
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2012ME05      Phys.Rev.Lett. 108, 122501 (2012)

R.Meharchand, R.G.T.Zegers, B.A.Brown, Sam M.Austin, T.Baugher, D.Bazin, J.Deaven, A.Gade, G.F.Grinyer, C.J.Guess, M.E.Howard, H.Iwasaki, S.McDaniel, K.Meierbachtol, G.Perdikakis, J.Pereira, A.M.Prinke, A.Ratkiewicz, A.Signoracci, S.Stroberg, L.Valdez, P.Voss, K.A.Walsh, D.Weisshaar, and R.Winkler

Probing Configuration Mixing in 12Be with Gamow-Teller Transition Strengths

NUCLEAR REACTIONS Li(12B, 7Be)12Be, E=80 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ(θ), B(GT) transition strength, level energies, J, π. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.108.122501
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2012WI06      Phys.Rev. C 85, 051603 (2012)

K.Wimmer, D.Bazin, A.Gade, J.A.Tostevin, T.Baugher, Z.Chajecki, D.Coupland, M.A.Famiano, T.K.Ghosh, G.F.Grinyer, R.Hodges, M.E.Howard, M.Kilburn, W.G.Lynch, B.Manning, K.Meierbachtol, P.Quarterman, A.Ratkiewicz, A.Sanetullaev, S.R.Stroberg, M.B.Tsang, D.Weisshaar, J.Winkelbauer, R.Winkler, M.Youngs

Probing elastic and inelastic breakup contributions to intermediate-energy two-proton removal reactions

NUCLEAR REACTIONS 9Be(28Mg, 26Ne), [28Mg secondary beam from 9Be(40Ar, X), E=140 MeV/nucleon primary reaction], E=93 MeV/nucleon; measured particle spectra, energy loss, time of flight, (26Ne)(particle)(particle)-coin, relative cross sections, σ(θ), relative and absolute yields using Coupled Cyclotron facility at NSCL; deduced missing mass spectrum for 26Ne and two proton coincidence events. Importance of stripping, diffraction-stripping, and diffraction two-proton removal mechanisms. Comparison with predictions of reaction model based on eikonal dynamics, and sd-shell structure amplitudes.

doi: 10.1103/PhysRevC.85.051603
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2012WI10      Phys.Rev.Lett. 109, 202505 (2012)

K.Wimmer, D.Bazin, A.Gade, J.A.Tostevin, T.Baugher, Z.Chajecki, D.Coupland, M.A.Famiano, T.K.Ghosh, G.F.Grinyer, R.Hodges, M.E.Howard, M.Kilburn, W.G.Lynch, B.Manning, K.Meierbachtol, P.Quarterman, A.Ratkiewicz, A.Sanetullaev, E.C.Simpson, S.R.Stroberg, M.B.Tsang, D.Weisshaar, J.Winkelbauer, R.Winkler, M.Youngs

Correlations in Intermediate Energy Two-Proton Removal Reactions

NUCLEAR REACTIONS 9Be(28Mg, X)26Ne, E=93 MeV/nucleon; measured reaction products; deduced σ(E), σ(θ, E), Dalitz plots. Comparison with calculations and available data.

doi: 10.1103/PhysRevLett.109.202505
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2011CH32      Phys.Rev. C 84, 014320 (2011)

R.J.Charity, J.M.Elson, J.Manfredi, R.Shane, L.G.Sobotka, B.A.Brown, Z.Chajecki, D.Coupland, H.Iwasaki, M.Kilburn, J.Lee, W.G.Lynch, A.Sanetullaev, M.B.Tsang, J.Winkelbauer, M.Youngs, S.T.Marley, D.V.Shetty, A.H.Wuosmaa, T.K.Ghosh, M.E.Howard

Investigations of three-, four-, and five-particle decay channels of levels in light nuclei created using a 9C beam

NUCLEAR REACTIONS 9Be(9C, X), E=70 MeV/nucleon, [secondary 9C beam from 9Be(16O, X), E=150 MeV/nucleon primary beam]; measured particle spectra using HiRA array, angular correlations between the particles in particle-decay channels. 8Be, 7,8,9B, 8,10C; deduced levels, width, J, π, isospin, branching ratios, excitation spectra of outgoing particles from many-particle decays of ground and excited states.

doi: 10.1103/PhysRevC.84.014320
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2011CH53      Phys.Rev. C 84, 051308 (2011)

R.J.Charity, J.M.Elson, J.Manfredi, R.Shane, L.G.Sobotka, Z.Chajecki, D.Coupland, H.Iwasaki, M.Kilburn, J.Lee, W.G.Lynch, A.Sanetullaev, M.B.Tsang, J.Winkelbauer, M.Youngs, S.T.Marley, D.V.Shetty, A.H.Wuosmaa, T.K.Ghosh, M.E.Howard

Isobaric multiplet mass equation for A=7 and 8

ATOMIC MASSES 7,8He, 7,8Li, 7,8Be, 7,8B, 8C; analyzed deviations from isobaric multiplet mass equation (IMME) for A=7, T=3/2 quartet and A=8, T=2 quintet; deduced coefficients from quadric, cubic, and quartic fits.

doi: 10.1103/PhysRevC.84.051308
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2011OM01      Phys.Rev. C 84, 042801 (2011)

P.D.O'Malley, D.W.Bardayan, A.S.Adekola, S.Ahn, K.Y.Chae, J.A.Cizewski, S.Graves, M.E.Howard, K.L.Jones, R.L.Kozub, L.Lindhardt, M.Matos, B.M.Moazen, C.D.Nesaraja, S.D.Pain, W.A.Peters, S.T.Pittman, K.T.Schmitt, J.F.Shriner, Jr., M.S.Smith, I.Spassova, S.Y.Strauss, J.L.Wheeler

Search for a resonant enhancement of the 7Be + d reaction and primordial 7Li abundances

NUCLEAR REACTIONS 2H(7Be, d), E=10 MeV; measured E(d), I(d), energy loss, differential cross section; search for 5/2+ resonance in 7Be+d system proved negative, R-matrix analysis, deduced upper limit for resonance width. Relevance to cosmological 7Li abundance.

doi: 10.1103/PhysRevC.84.042801
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2011PE12      Phys.Rev. C 83, 054614 (2011)

G.Perdikakis, R.G.T.Zegers, S.M.Austin, D.Bazin, C.Caesar, J.M.Deaven, A.Gade, D.Galaviz, G.F.Grinyer, C.J.Guess, C.Herlitzius, G.W.Hitt, M.E.Howard, R.Meharchand, S.Noji, H.Sakai, Y.Shimbara, E.E.Smith, C.Tur

Gamow-Teller unit cross sections for (t, 3He) and (3He, t) reactions

NUCLEAR REACTIONS 1,2H, 12C(t, 3He), E=115 MeV/nucleon; measured σ(θ), B(GT), excitation-energy spectrum. 6Li, 13C, 26Mg(t, 3He), E=115 MeV/nucleon; 12,13C, 18O, 26Mg, 58,62,64Ni, 68Zn, 118,120Sn(3He, t), E=140 MeV/nucleon; A=1-120 targets; analyzed cross section, B(GT), unit cross sections, distortion factors, volume integrals, kinematic factors. Plane and distorted-wave Born calculations.

doi: 10.1103/PhysRevC.83.054614
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2010BA21      Phys.Rev. C 81, 065802 (2010)

D.W.Bardayan, J.C.Blackmon, K.Y.Chae, M.E.Howard, C.Matei, W.Martin, M.Matos, B.H.Moazen, C.D.Nesaraja, W.A.Peters, S.T.Pittman, M.S.Smith, I.Spassova

Inelastic 17F(p, p)17F scattering at Ec.m.=3 MeV and the 14O(α, p)17F reaction rate

NUCLEAR REACTIONS 1H(17F, X), E=52-58 MeV; measured Q-value spectra

doi: 10.1103/PhysRevC.81.065802
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2010CH42      Phys.Rev. C 82, 041304 (2010)

R.J.Charity, J.M.Elson, J.Manfredi, R.Shane, L.G.Sobotka, Z.Chajecki, D.Coupland, H.Iwasaki, M.Kilburn, J.Lee, W.G.Lynch, A.Sanetullaev, M.B.Tsang, J.Winkelbauer, M.Youngs, S.T.Marley, D.V.Shetty, A.H.Wuosmaa, T.K.Ghosh, M.E.Howard

2p-2p decay of 8C and isospin-allowed 2p decay of the isobaric-analog state in 8B

NUCLEAR REACTIONS 9Be(9C, 8B), [9C beam from 9Be(16O, X) fragmentation], E=70 MeV/nucleon; measured Ep, Ip, 6Li-p-p correlated events from an excited state (IAS of 8C g.s.) in 8B by analyzing complete kinematics of 2p+6Li decay products; deduced 2p decay (isospin-allowed 2p decay between isobaric analog states). 9Be(9C, 8C), [9C beam from 9Be(16O, X) fragmentation], E=70 MeV/nucleon; measured Ep, Ip, 6Be-p-p and α-p-p-p-p correlated events from 8C g.s. by analyzing complete kinematics of 2p+6Be and α+2p+2p events.

RADIOACTIVITY 8C(2p); measured Ep, Ip, Eα, Iα, α-p-p-p-p coin, α-p-p coin from the decay of 8C g.s.

doi: 10.1103/PhysRevC.82.041304
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2010GA36      J.Phys.:Conf.Ser. 202, 012009 (2010)

D.Galaviz, A.M.Amthor, D.Bazin, A.D.Becerril, B.A.Brown, A.A.Chen, A.Cole, J.M.Cook, T.Elliot, A.Estrade, Z.S.Fulop, A.Gade, T.Glasmacher, A.Heger, M.E.Howard, R.Kessler, G.Lorusso, M.Matos, F.Montes, W.Muller, J.Pereira, H.Schatz, B.Sherrill, F.Schertz, Y.Shimbara, E.Smith, K.Smith, A.Tamii, A.Stolz, D.Weisshaar, M.Wallace, M.Wiescher, R.G.T.Zegers

Nucleosynthesis of proton-rich nuclei. Experimental results on the rp-process

NUCLEAR REACTIONS 9Be(36Ar, X)30S, (40Ca, X)36K, (40Ca, X)37Ca, E=140 MeV/nucleon; measured 30S, 36K, 37Ca [obtained by further stripping of one nucleon from fragmentation product] in-flight Eγ, Iγ, (recoil)γ-coin; deduced 29P(p, γ)30S stellar reaction rate relevant to X-bursts. Compared with other published reaction rates.

doi: 10.1088/1742-6596/202/1/012009
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2010ZE03      Phys.Rev.Lett. 104, 212504 (2010)

R.G.T.Zegers, R.Meharchand, Y.Shimbara, S.M.Austin, D.Bazin, B.A.Brown, C.Aa.Diget, A.Gade, C.J.Guess, M.Hausmann, G.W.Hitt, M.E.Howard, M.King, D.Miller, S.Noji, A.Signoracci, K.Starosta, C.Tur, C.Vaman, P.Voss, D.Weisshaar, J.Yurkon

34P(7Li, 7Be+γ) Reaction at 100A MeV in Inverse Kinematics

NUCLEAR REACTIONS 34P(7Li, γ7Be)34Si, E=100 MeV/nucleon; measured Eγ, Iγ, γ-particle coin.; deduced σ(θ), β+ Gamow-Teller transition strength distribution. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.104.212504
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2009HI08      Phys.Rev. C 80, 014313 (2009)

G.W.Hitt, R.G.T.Zegers, Sam M.Austin, D.Bazin, A.Gade, D.Galaviz, C.J.Guess, M.Horoi, M.E.Howard, W.D.M.Rae, Y.Shimbara, E.E.Smith, C.Tur

Gamow-Teller transitions to 64Cu measured with the 64Zn(t, 3He) reaction

NUCLEAR REACTIONS 64Zn(t, 3He), E=115 MeV/nucleon; measured particle spectra, σ(θ) and Gamow-Teller strength distributions; deduced electron capture rate on 64Zn as a function of stellar temperature. Comparison with shell model calculations and experimental data from 64Zn(d, 2He) reaction.

doi: 10.1103/PhysRevC.80.014313
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2008HO10      Phys.Rev. C 78, 047302 (2008)

M.E.Howard, R.G.T.Zegers, Sam M.Austin, D.Bazin, B.A.Brown, A.L.Cole, B.Davids, M.Famiano, Y.Fujita, A.Gade, D.Galaviz, G.W.Hitt, M.Matos, S.D.Reitzner, C.Samanta, L.J.Schradin, Y.Shimbara, E.E.Smith, C.Simenel

Gamow-Teller strengths in 24Na using the 24Mg(t, 3He) reaction at 115A MeV

NUCLEAR REACTIONS 24Mg(t, 3He), E=115 MeV/nucleon; measured particle spectra, σ(θ); deduced levels, B(GT). Comparisons of GT values with 24Mg(3He, t), (d, 2He) reactions and USDA, USDB calculations.

doi: 10.1103/PhysRevC.78.047302
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2008ZE05      Phys.Rev. C 78, 014314 (2008)

R.G.T.Zegers, R.Meharchand, T.Adachi, Sam M.Austin, B.A.Brown, Y.Fujita, M.Fujiwara, C.J.Guess, H.Hashimoto, K.Hatanaka, M.E.Howard, H.Matsubara, K.Nakanishi, T.Ohta, H.Okamura, Y.Sakemi, Y.Shimbara, Y.Shimizu, C.Scholl, A.Signoracci, Y.Tameshige, A.Tamii, M.Yosoi

Spectroscopy of 24Al and extraction of Gamow-Teller strengths with the 24Mg(3He, t) reaction at 420 MeV

NUCLEAR REACTIONS 24Mg(3He, t), E=420 MeV; measured triton spectra, σ(θ). 24Al; deduced levels, J, π, angular momenta, GT strengths. Comparison with model calculations and 24Mg(p, n) data.

doi: 10.1103/PhysRevC.78.014314
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2007ZE06      Phys.Rev.Lett. 99, 202501 (2007)

R.G.Zegers, T.Adachi, H.Akimune, S.M.Austin, A.M.van den Berg, B.A.Brown, Y.Fujita, M.Fujiwara, S.Gales, C.J.Guess, M.N.Harakeh, H.Hashimoto, K.Hatanaka, R.Hayami, G.W.Hitt, M.E.Howard, M.Itoh, T.Kawabata, K.Kawase, M.Kinoshita, M.Matsubara, K.Nakanishi, S.Nakayama, S.Okumura, T.Ohta, Y.Sakemi, Y.Shimbara, Y.Shimizu, C.Scholl, C.Simenel, Y.Tameshige, A.Tamii, M.Uchida, T.Yamagata, M.Yosoi

Extraction of Weak Transition Strengths via the (3He, t) Reaction at 420 MeV

NUCLEAR REACTIONS 12,13C, 18O, 26Mg, 58Ni, 60Ni, 90Zr, 118Sn, 208Pb(3He, t), E=420 MeV; measured triton spectra and cross sections. Deduced B(GT).

doi: 10.1103/PhysRevLett.99.202501
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2006HI08      Nucl.Instrum.Methods Phys.Res. A566, 264 (2006)

G.W.Hitt, S.M.Austin, D.Bazin, A.L.Cole, J.Dietrich, A.Gade, M.E.Howard, S.D.Reitzner, B.M.Sherrill, C.Simenel, E.E.Smith, J.Stetson, A.Stolz, R.G.T.Zegers

Development of a secondary triton beam from primary 16, 18O beams for (t, 3He) experiments at intermediate energies

NUCLEAR REACTIONS Be(18O, tX), E=120 MeV/nucleon; Be(16O, tX), E=150 MeV/nucleon; measured triton yields vs energy, target thickness. 24Mg(t, 3He), E=115 MeV/nucleon; measured excitation energy spectra.

doi: 10.1016/j.nima.2006.07.045
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2006ZE01      Phys.Rev. C 74, 024309 (2006)

R.G.T.Zegers, H.Akimune, S.M.Austin, D.Bazin, A.M.van den Berg, G.P.A.Berg, B.A.Brown, J.Brown, A.L.Cole, I.Daito, Y.Fujita, M.Fujiwara, S.Gales, M.N.Harakeh, H.Hashimoto, R.Hayami, G.W.Hitt, M.E.Howard, M.Itoh, J.Janecke, T.Kawabata, K.Kawase, M.Kinoshita, T.Nakamura, K.Nakanishi, S.Nakayama, S.Okumura, W.A.Richter, D.A.Roberts, B.M.Sherrill, Y.Shimbara, M.Steiner, M.Uchida, H.Ueno, T.Yamagata, M.Yosoi

The (t, 3He) and (3He, t) reactions as probes of Gamow-Teller strength

NUCLEAR REACTIONS 26Mg(t, 3He), E=115 MeV/nucleon; 26Mg(3He, t), E=140 MeV/nucleon; measured σ(E, θ); deduced Gamow-Teller transition strengths. Comparison with model predictions.

doi: 10.1103/PhysRevC.74.024309
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2005GA22      Phys.Rev.Lett. 95, 022502 (2005); Erratum Phys.Rev.Lett. 96, 189901 (2006)

A.Gade, D.Bazin, A.Becerril, C.M.Campbell, J.M.Cook, D.J.Dean, D.-C.Dinca, T.Glasmacher, G.W.Hitt, M.E.Howard, W.F.Mueller, H.Olliver, J.R.Terry, K.Yoneda

Quadrupole Deformation of the Self-Conjugate Nucleus 72Kr

NUCLEAR REACTIONS 197Au(72Kr, 72Kr'), E=69.3 MeV/nucleon; 197Au(78Kr, 78Kr'), E=57.4 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin following projectile Coulomb excitation. 72,78Kr deduced excitation B(E2), quadrupole moments, deformation. Comparison with shell-model Monte Carlo predictions.

doi: 10.1103/PhysRevLett.95.022502
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2005ZE04      Nucl.Phys. A758, 67c (2005)

R.G.T.Zegers, A.L.Cole, H.Akimune, S.M.Austin, D.Bazin, A.M.van den Berg, G.P.A.Berg, J.Brown, I.Daito, Y.Fujita, M.Fujiwara, K.Hara, M.N.Harakeh, G.W.Hitt, M.E.Howard, J.Janecke, T.Kawabataj T.Nakamura, H.Ueno, H.Schatz, B.M.Sherrill, M.Steiner

Weak interaction strengths for supernovae calculations via the (t, 3He) reaction on medium-heavy nuclei

NUCLEAR REACTIONS 58Ni(t, 3He), E=112 MeV/nucleon; measured σ(E, θ); deduced Gamow-Teller strength distribution.

doi: 10.1016/j.nuclphysa.2005.05.018
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2003NI06      Nucl.Phys. A718, 214c (2003)

S.Nishimura, R.N.Boyd, A.L.Cole, M.A.Famiano, M.E.Howard, M.Kurata-Nishimura, Y.Nishi, I.Tanihata

Half-life measurement of neutron-rich nuclei relevant to astrophysical r-process at RIKEN

doi: 10.1016/S0375-9474(03)00717-6
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