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NSR database version of April 11, 2024.

Search: Author = B.T.Roeder

Found 61 matches.

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2023BI03      Phys.Rev.Lett. 130, 222501 (2023)

J.Bishop, G.V.Rogachev, S.Ahn, M.Barbui, S.M.Cha, E.Harris, C.Hunt, C.H.Kim, D.Kim, S.H.Kim, E.Koshchiy, Z.Luo, C.Park, C.E.Parker, E.C.Pollacco, B.T.Roeder, M.Roosa, A.Saastamoinen, D.P.Scriven

First Observation of the β3αp Decay of 13O via β-Delayed Charged-Particle Spectroscopy

RADIOACTIVITY 13O(β+p3α) [from 3He(14N, 13O), E=15.1 MeV/nucleon]; measured decay products, Eα, Iα. 13N; deduced β-delayed 3αp branching ratio, four previously unknown α-decaying excited states in 13N. Comparison with systematics. The K500 Cyclotron at Texas AM University, the Texas Active Target (TexAT) time projection chamber.

doi: 10.1103/PhysRevLett.130.222501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2023DR02      Phys.Rev. C 107, L061303 (2023)

N.Dronchi, J.Berkman, R.J.Charity, J.M.Elson, L.G.Sobotka, A.G.Thomas, A.Saastamoinen, M.Barbui, J.Bishop, C.E.Parker, B.T.Roeder, G.V.Rogachev, D.P.Scriven, S.T.Marley, R.M.Shaffer

Search for an s-wave resonance in 7Li just above the proton-decay threshold

NUCLEAR REACTIONS 2H(6He, n)7Li, E=6.4 MeV/nucleon; measured charged particles from 7Li excited states decay; deduced invariant mass, resonances. 6,7Li, 8Be; deduced energies and widths of the states. Charged particles identified with array of 4 Si-Si telescopes from HIRA array. Secondary beam produced from 7Li(d, 3He)6He reaction at K150 cyclotron (Texas AM University Cyclotron Institute).

doi: 10.1103/PhysRevC.107.L061303
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2023HU20      Phys.Rev. C 108, L051606 (2023)

C.Hunt, S.Ahn, J.Bishop, E.Koshchiy, E.Aboud, M.Alcorta, A.Bosh, K.Hahn, S.Han, C.E.Parker, E.C.Pollacco, B.T.Roeder, M.Roosa, S.Upadhyayula, A.S.Volya, G.V.Rogachev

Spectroscopy of 13Be through isobaric analog states in 13B

doi: 10.1103/PhysRevC.108.L051606
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2022BA39      Phys.Rev. C 106, 054310 (2022)

M.Barbui, A.Volya, E.Aboud, S.Ahn, J.Bishop, V.Z.Goldberg, J.Hooker, C.H.Hunt, H.Jayatissa, Tz.Kokalova, E.Koshchiy, S.Pirrie, E.Pollacco, B.T.Roeder, A.Saastamoinen, S.Upadhyayula, C.Wheldon, G.V.Rogachev

α-cluster structure of 18Ne

NUCLEAR REACTIONS 4He(14O, α), E=61.8 MeV; measured reaction product, Eα, Iα, angular distribution; deduced σ(θ), excitation function of 18Ne. 18Ne; deduced resonances J, π, resonance total and partial widths. 18Ne, O; calculated levels J, π. Analysis with a multichannel R-matrix approach. Shell model with FSU interaction Hamiltonian calculations. Comparison with other experimental data. TexAT active target at magnetic achromat recoil separator (Cyclotron Institute at Texas AM University).

doi: 10.1103/PhysRevC.106.054310
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Data from this article have been entered in the XUNDL database. For more information, click here.


2021BI06      Phys.Rev. C 103, L051303 (2021)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, A.Bosh, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, M.Munch, E.C.Pollacco, C.D.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Evidence against the Efimov effect in 12C from spectroscopy and astrophysics

RADIOACTIVITY 12N(β+); 12B(β-); measured β-delayed charged particles, Eα, Iα from the decay of 40-MeV 12N beam stopped inside the active-area of the TexAT (Texas Active target) TPC (Time Projection Chamber), Eγ, Iγ, γγ-coin from the decay of 12B using Gammasphere array at ANL. 12C; deduced no evidence for an hypothetical state predicted by Efimov effect at 7.458 MeV from a combined analysis of the two experiments involving charged-particle spectroscopy at Texas A and M, and γ-ray measurements at ANL, along with astrophysical rate calculations. Relevance to rate required for stars to undergo the red giant phase.

doi: 10.1103/PhysRevC.103.L051303
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2021ZA03      Phys.Lett. B 816, 136256 (2021)

J.C.Zamora, V.Guimaraes, G.V.Rogachev, S.Ahn, J.Lubian, E.N.Cardozo, E.Aboud, M.Assuncao, M.Barbui, J.Bishop, A.Bosh, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, S.Lukyanov, R.O'Dwyer, Y.Penionzhkevich, B.T.Roeder, A.Saastamoinen, S.Upadhyayula

Direct fusion measurement of the 8B proton-halo nucleus at near-barrier energies

NUCLEAR REACTIONS 40Ar(8B, X), E=5.1 MeV/nucleon; measured reaction products; deduced fusion σ, barrier parameters. Universal Fusion Function (UFF) parameterization, comparison with available data.

doi: 10.1016/j.physletb.2021.136256
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2633.


2020BI11      Phys.Rev. C 102, 041303 (2020)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, A.Bosh, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, E.C.Pollacco, C.D.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Almost medium-free measurement of the Hoyle state direct-decay component with a TPC

RADIOACTIVITY 12N(β+), (β+α)[from 3He(10B, 12N), E=11 MeV/nucleon at K500 cyclotron at the Cyclotron Institute at Texas A and M University, followed by isotopic separation using Momentum Achromatic Recoil Spectrometer]; measured β-delayed charged-particles using Texas active target time-projection chamber (TPC). 12C; deduced upper limit for the nonsequential component of the decay of the excited 0+, Hoyle state in an almost medium-free reaction. Comparison with previous experimental results, and with predictions from Faddeev calculations.

doi: 10.1103/PhysRevC.102.041303
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2020BI15      Nucl.Instrum.Methods Phys.Res. A964, 163773 (2020)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, P.Baron, A.Bosh, E.Delagnes, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, R.O'Dwyer, E.C.Pollacco, C.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Beta-delayed charged-particle spectroscopy using TexAT

RADIOACTIVITY 12N(IT), (EC), 12C(3α), 8Be(2α) [from 3He(10B, n)12N, E=11 MeV/nucleon]; measured decay products, Eα, Iα; deduced branching ratio of 12N to states in 12C above the 3-α threshold, the total branching ratio to the Hoyle state, 12N T1/2 using the β-delayed charged-particle-decay. Comparison with available data.

doi: 10.1016/j.nima.2020.163773
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2020IA01      Phys.Rev. C 101, 015504 (2020)

V.E.Iacob, J.C.Hardy, H.I.Park, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen

New precise half-life measurement for the superallowed β+ emitter 34Ar

RADIOACTIVITY 34Ar(β+) [from 1H(35Cl, 2n), E=30 MeV/nucleon at the K500 superconducting cyclotron of Texas A and M University, followed by separation of fragments using the Momentum Achromat Recoil Spectrometer (MARS)]; measured Eβ, decay time spectrum, precise T1/2 of 34Ar decay using 4π proportional gas counter; deduced ft value for the superallowed β transition. Data analyzed as a linked parent-daughter pair. Discussed uncertainty budget. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.101.015504
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Data from this article have been entered in the XUNDL database. For more information, click here.


2020IA02      Phys.Rev. C 101, 045501 (2020)

V.E.Iacob, J.C.Hardy, H.I.Park, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen, I.S.Towner

Precise β branching-ratio measurement for the 0+ → 0+ superallowed decay of 34Ar

RADIOACTIVITY 34Ar(β+), (EC)[from 1H(35Cl, 2n), E=30 MeV/nucleon, followed by separation of fully stripped reaction ejectiles using the MARS spectrometer at the K500 superconducting cyclotron at Texas A and M University]; measured Eβ+, Iβ+, Eγ, Iγ, β+γ-coin. 34Cl; deduced levels, J, π, β-branching ratio, EC to β+ emission ratios, logft, superallowed 0+ to 0+ β transition, isospin-symmetry-breaking correction, ratios of ft values for the mirror pair of superallowed transitions 34Ar to 34Cl and 34Cl to 34S. Comparison with previous experimental data, and with shell model calculations with Woods-Saxon radial wave functions. Systematics of logft ratios in A=26, 34, 38 and 42 mirror pairs. Relevance to up-down quark-mixing element Vud of the Cabibbo-Kobayashi-Maskawa matrix.

doi: 10.1103/PhysRevC.101.045501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2020JA02      Phys.Lett. B 802, 135267 (2020)

H.Jayatissa, G.V.Rogachev, V.Z.Goldberg, E.Koshchiy, G.Christian, J.Hooker, S.Ota, B.T.Roeder, A.Saastamoinen, O.Trippella, S.Upadhyayula, E.Uberseder

Constraining the 22Ne(α, γ))26Mg and 22Ne(α, n)25Mg reaction rates using sub-Coulomb α-transfer reactions

NUCLEAR REACTIONS 6Li(22Ne, d), E(cm)=4.6 MeV; 6Li(22Ne, t), E(cm)=5.3 MeV; measured reaction products; deduced excitation energies, σ, resonance parameters, astrophysical rates.

doi: 10.1016/j.physletb.2020.135267
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2517.


2020UP01      Phys.Rev. C 101, 034604 (2020)

S.Upadhyayula, G.V.Rogachev, J.Bishop, V.Z.Goldberg, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, E.Uberseder, A.Volya, B.T.Roeder, A.Saastamoinen

Search for the high-spin members of the α:2n:α band in 10Be

NUCLEAR REACTIONS 4He(6He, 6He), (6He, 6He'), E(cm)=4-9 MeV [secondary 6He beam from 2H(7Li, 6He), E=60 MeV]; measured reaction products, Eα, Iα, σ(E, θ), using silicon detector for α detection and the MARS spectrometer for secondary beam identification at the cyclotron facility of Texas A and M University. 10Be; deduced resonance parameters and upper limit of Γ(α)/Γ(α') for an yrast 6+ state at 13.5 MeV as the next member of the molecular α:2n:α rotational band in 10Be; no evidence found for a strong resonance at 13.5 MeV in the elastic and inelastic channels. GEANT4 Monte Carlo simulations. Comparison with theoretical predictions, and with previous experimental studies.

doi: 10.1103/PhysRevC.101.034604
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019BE23      Phys.Rev. C 100, 015503 (2019)

M.Bencomo, J.C.Hardy, V.E.Iacob, H.I.Park, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen, I.S.Towner

Precise branching ratio measurement for the superallowed β+ decay of 26Si: Completion of a second mirror pair

RADIOACTIVITY 26Si(β+), (EC)[from 1H(27Al, 2n), E=30 MeV/nucleon from the Texas A and M University K500 superconducting cyclotron, followed by analysis of reaction products by MARS system according to A/Q ratio]; measured β+ particles, Eγ, Iγ, β+γ-coin using plastic scintillator for β+ detection and HPGe detector for γ detection. 26Al; deduced levels, β++ϵ branching ratios, Gamow-Teller branches, superallowed (0+ to 0+) decay branch, logft, Ft. Comparison with sd shell-model calculations using USD, USD-A, and USD-B effective interactions. Discussed relevance to determination of up-down Vud quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix.

doi: 10.1103/PhysRevC.100.015503
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019HO14      Phys.Rev. C 100, 054618 (2019)

J.Hooker, G.V.Rogachev, E.Koshchiy, S.Ahn, M.Barbui, V.Z.Goldberg, C.Hunt, H.Jayatissa, E.C.Pollacco, B.T.Roeder, A.Saastamoinen, S.Upadhyayula

Structure of 9C through proton resonance scattering with the Texas Active Target detector

NUCLEAR REACTIONS 1H(8B, p)9C*, E=60.8 MeV, [secondary 8B beam from 6Li(3He, n)8B, E=13.2 MeV/nucleon primary reaction, and using the Momentum Achromat Recoil Spectrometer (MARS) at the Cyclotron Institute of Texas A and M University]; measured charged products, 8B spectrum, Ep, (8Be)p-coin, angular distributions using TexAT time projection chamber (TPC) and CsI(Tl) scintillators. 9C; deduced levels, resonances, J, π, phase shifts, widths using R-matrix analysis. Comparison with previous experimental data, and with ab initio calculations in literature.

doi: 10.1103/PhysRevC.100.054618
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2423. Data from this article have been entered in the XUNDL database. For more information, click here.


2019WE12      Phys.Rev. C 100, 024604 (2019)

W.D.Weintraub, N.Keeley, K.W.Kemper, K.Kravvaris, F.Marechal, D.Robson, B.T.Roeder, K.Rusek, A.Volya

Analyzing powers and the role of multistep processes in the 12C(7Li, t)16O reaction

NUCLEAR REACTIONS 12C(7Li, t), (polarized 7Li, t)16O, E=34 MeV; measured E(t), I(t), σ(θ), T10, T20 and T30 analyzing powers using two ΔE-E telescopes of Si detectors at the FSU tandem accelerator facility. 16O; deduced levels, J, π; calculated Sα spectroscopic amplitudes and relative angular momentum for the various components of the 16O=α+12C radial wave functions from the shell model calculations. Coupled channel Born approximation (CCBA) and DWBA analyses of σ(θ) and analyzing power data.

doi: 10.1103/PhysRevC.100.024604
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2406. Data from this article have been entered in the XUNDL database. For more information, click here.


2018IA01      Phys.Rev. C 97, 035501 (2018)

V.E.Iacob, J.C.Hardy, L.Chen, V.Horvat, M.Bencomo, N.Nica, H.I.Park, B.T.Roeder, A.Saastamoinen

Precise half-life measurement of the superallowed emitter 30S

RADIOACTIVITY 30S(β+), (EC)[from 1H(31P, 2n), E=30 MeV/nucleon]; 30P(β+), (EC)[from 30S decay]; measured β+ using 4π proportional gas counter, half-lives of 30S and 30P decays. Comparison with previous measurements. Relevance to determination of up-down element of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix Vud for 0+ to 0+ superallowed β transition in the decay of 30S to 30P.

NUCLEAR REACTIONS 1H(31P, 2n)27Si/29P/30S/31S, E=30 MeV/nucleon; measured yields of ions momentum achromat recoil spectrometer (MARS) spectrometer at Texas A and M University K500 superconducting cyclotron facility.

doi: 10.1103/PhysRevC.97.035501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2018SH27      Phys.Rev. C 98, 015502 (2018)

P.D.Shidling, R.S.Behling, B.Fenker, J.C.Hardy, V.E.Iacob, M.Mehlman, H.I.Park, B.T.Roeder, D.Melconian

High-precision half-life measurement of the β+ decay of 21Na

RADIOACTIVITY 21Na(β+)[from 1H(22Ne, 21Na), E=25 MeV/nucleon, followed by analysis of reaction products by the momentum achromat recoil spectrometer (MARS) at Texas A and M cyclotron facility]; measured positrons and half-life of the decay of 21Na using 4π continuous gas-flow proportional counter; deduced magnitude of the up-down element of the Cabbibo-Kobayashi-Maskawa matrix Vud. Comparison with previous experimental values, and deduced averaged half-life and Ft value.

doi: 10.1103/PhysRevC.98.015502
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Data from this article have been entered in the XUNDL database. For more information, click here.


2017HO10      Phys.Lett. B 769, 62 (2017)

J.Hooker, G.V.Rogachev, V.Z.Goldberg, E.Koshchiy, B.T.Roeder, H.Jayatissa, C.Hunt, C.Magana, S.Upadhyayula, E.Uberseder, A.Saastamoinen

Structure of 10N in 9C+p resonance scattering

NUCLEAR REACTIONS 1H(9C, X)10N, E=23.4 MeV/nucleon; measured reaction products, Ep, Ip; deduced σ, J, π, resonance parameters.

doi: 10.1016/j.physletb.2017.03.025
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2265. Data from this article have been entered in the XUNDL database. For more information, click here.


2016MC09      Phys.Rev. C 94, 065806 (2016)

E.McCleskey, A.Banu, M.McCleskey, T.Davinson, D.T.Doherty, G.Lotay, B.T.Roeder, A.Saastamoinen, A.Spiridon, L.Trache, J.P.Wallace, P.J.Woods, R.E.Tribble

Simultaneous measurement of β delayed proton and γ decay of 27P

RADIOACTIVITY 27P(β+), (EC), (β+p)[from 1H(28Si, X), E=40 MeV/nucleon]; measured reaction products of 27P, 25Si and 24Al, Eγ, Iγ, Ep, Ip, βp-, βγ-, and pβγ-coin using Momentum Achromat Recoil Spectrometer (MARS) at Texas A and M cyclotron facility. 27Si; deduced levels, J, π, IAS, β++ϵ feedings, logft. 26Al; deduced levels.

doi: 10.1103/PhysRevC.94.065806
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Data from this article have been entered in the XUNDL database. For more information, click here.


2016PI01      Eur.Phys.J. A 52, 24 (2016)

R.G.Pizzone, B.T.Roeder, M.McCleskey, L.Trache, R.E.Tribble, C.Spitaleri, C.A.Bertulani, S.Cherubini, M.Gulino, I.Indelicato, M.La Cognata, L.Lamia, G.G.Rapisarda, R.Sparta

Trojan Horse measurement of the 18F(p, α)15O astrophysical S(E)-factor

NUCLEAR REACTIONS 2H(18F, nα), E=52 MeV; measured α-particles using TESCA, 15O using X1-PSD detectors; deduced deuteron breakup momentum distribution. 18F(p, α), E not given; deduced reaction rate vs nuclear temperature, σ(θ), S-factor for individual levels vs E(cm) using Trojan Horse method.

doi: 10.1140/epja/i2016-16024-3
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2214. Data from this article have been entered in the XUNDL database. For more information, click here.


2016UB01      Phys.Lett. B 754, 323 (2016)

E.Uberseder, G.V.Rogachev, V.Z.Goldberg, E.Koshchiy, B.T.Roeder, M.Alcorta, G.Chubarian, B.Davids, C.Fu, J.Hooker, H.Jayatissa, D.Melconian, R.E.Tribble

Nuclear structure beyond the neutron drip line: The lowest energy states in 9He via their T = 5/2 isobaric analogs in 9Li

NUCLEAR REACTIONS 1H(8He, 8He), (8He, X)9Li, E(cm)<4.5 MeV; measured reaction products. 9He; deduced energy levels, J, π. Comparison with available data.

doi: 10.1016/j.physletb.2016.01.014
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Data from this article have been entered in the XUNDL database. For more information, click here.


2015ME03      Phys.Rev. C 91, 044317 (2015)

C.E.Mertin, D.D.Caussyn, A.M.Crisp, N.Keeley, K.W.Kemper, O.Momotyuk, B.T.Roeder, A.Volya

Single particle strengths and mirror states in 15N - 15O below 12.0 MeV

NUCLEAR REACTIONS 14N(d, p), E=16 MeV; measured proton and deuteron spectra, σ(θ) using ΔE-E telescopes at FSU tandem-linac accelerator facility. 15N; deduced levels, J, π, l-transfers. DWBA analysis. 12C(d, p)13C, E=16 MeV; measured proton spectra to identify 13C contaminant peaks in the higher excitation energy region. 15N, 15O; comparison of mirror states. Comparison with previous experimental data, and with shell model calculations.

doi: 10.1103/PhysRevC.91.044317
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2161. Data from this article have been entered in the XUNDL database. For more information, click here.


2015PA32      Phys.Rev. C 92, 015502 (2015)

H.I.Park, J.C.Hardy, V.E.Iacob, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, E.McCleskey, R.E.Tribble, I.S.Towner

Precise measurement of branching ratios in the β decay of 38Ca

RADIOACTIVITY 38Ca(β+), (EC)[from 1H(39K, 2n), E=30 MeV/nucleon]; measured fully-stripped reaction ejectiles using Momentum Achromat Recoil Spectrometer (MARS) at Texas A and M cyclotron facility, Eβ, Iβ, Eγ, Iγ, β+γ-coin. 38K; deduced levels, J, π, β+ branching ratios, logft values, branching ratio and Ft value for superallowed β transition, the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix Vud. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.92.015502
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Data from this article have been entered in the XUNDL database. For more information, click here.


2014MC03      Phys.Rev. C 89, 044605 (2014)

M.McCleskey, A.M.Mukhamedzhanov, L.Trache, R.E.Tribble, A.Banu, V.Eremenko, V.Z.Goldberg, Y.-W.Lui, E.McCleskey, B.T.Roeder, A.Spiridon, F.Carstoiu, V.Burjan, Z.Hons, I.J.Thompson

Determination of the asymptotic normalization coefficients for 14C + n ←→ 15C, the (+14)C(n, γ)15C reaction rate, and evaluation of a new method to determine spectroscopic factors

NUCLEAR REACTIONS 13C(14C, 14C), (14C, 15C)12C, E=12 MeV/nucleon; 2H(14C, p)15C, E=11.7 MeV/nucleon; 14C(d, p), E=60 MeV; measured particle spectra, σ(θ) using MDM spectrometer at Texas A-M Cyclotron Institute. 15C; deduced levels, asymptotic normalization coefficient (ANC) and spectroscopic factors for g.s. and first excited state. 13C, 17O; population of g.s. in both and excited levels in 13C. DWBA analysis with Woods-Saxon and doublefolding (DF) potentials for 13C+14C reaction. FRESCO code and adiabatic distorted wave approximation (ADWA) used for analysis of σ(θ) data in 2H+14C reactions. 15C, 15F; analyzed mirror analogy for spectroscopic factors. Deuteron stripping theory. 14C(n, γ), E=10 keV-1 MeV; deduced astrophysical direct-capture rate σ(E) to g.s. and first excited state using RADCAP code and ANCs from the present work. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.89.044605
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2105. Data from this article have been entered in the XUNDL database. For more information, click here.


2014ME04      Acta Phys.Pol. B45, 159 (2014)

C.E.Mertin, D.D.Caussyn, A.M.Crisp, N.Keeley, K.W.Kemper, O.Momotyuk, B.T.Roeder, A.Volya

Separation Between d5/2 and s1/2 Neutron Single Particle Strength in 15N

NUCLEAR REACTIONS 14N(d, p), E=16 MeV; measured reaction products, Ep, Ip; deduced σ(θ), spectroscopic factors. FRESCO calculations.

doi: 10.5506/APhysPolB.45.159
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2014PA09      Phys.Rev.Lett. 112, 102502 (2014)

H.I.Park, J.C.Hardy, V.E.Iacob, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, E.Simmons, R.E.Tribble, I.S.Towner

β Decay of 38Ca: Sensitive test of Isospin Symmetry-Breaking Corrections from Mirror Superallowed 0+ → 0+ Transitions

RADIOACTIVITY 38Ca, 38K(β+) [from 1H(39K, 2n)38Ca, E=30 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced branching ratio, high-precision log ft value. Test of the isospin symmetry-breaking corrections, comparison with available data.

doi: 10.1103/PhysRevLett.112.102502
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Data from this article have been entered in the XUNDL database. For more information, click here.


2014RO26      Phys.Rev. C 90, 047601 (2014)

F.J.Rodriguez, J.A.Liendo, N.Keeley, K.W.Kemper, J.A.Mielgo, B.T.Roeder, W.D.Weintraub

TT20 analyzing powers from 12C(7Li, α)15N

NUCLEAR REACTIONS 12C(polarized 7Li, α)15N, E=34 MeV; measured Eα, Iα, transverse analyzing powers TT20(θ) using ΔE-E telescope detectors at FSU Tandem-Linear Accelerator (LINAC) facility. 15N; deduced levels, magnitude and shapes of analyzing power distributions for various Jπ values.

doi: 10.1103/PhysRevC.90.047601
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2014SH25      Phys.Rev. C 90, 032501 (2014)

P.D.Shidling, D.Melconian, S.Behling, B.Fenker, J.C.Hardy, V.E.Iacob, E.McCleskey, M.McCleskey, M.Mehlman, H.I.Park, B.T.Roeder

Precision half-life measurement of the β+ decay of 37K

RADIOACTIVITY 37K(β+)[from 1H(38Ar, 2n), E=29 MeV/nucleon, followed by separation using MARS apparatus at Texas A-M cyclotron facility]; measured Eβ, Iβ, precise half-life of 37K ground state using a 4π continuous-gas-flow proportional counter and a fast tape-transport system; deduced improved logft value, and Vud parameter. Comparison with previous experimental studies.

doi: 10.1103/PhysRevC.90.032501
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2013PO08      Nucl.Instrum.Methods Phys.Res. B 305, 16 (2013)

F.E.Portillo, J.A.Liendo, A.C.Gonzalez, D.D.Caussyn, N.R.Fletcher, O.A.Momotyuk, B.T.Roeder, I.Wiedenhoever, K.W.Kemper, P.Barber, L.Sajo-Bohus

Light element quantification by lithium elastic scattering

NUCLEAR REACTIONS 1H(6Li, 6Li), 7Li(6Li, 6Li), 7Li(16O, 16O), 12C(6Li, 6Li), 19F(6Li, 6Li), E=13-20 MeV; measured products, Eπ, Iπ; deduced σ(θ). Data were imported from EXFOR entry C2037.

doi: 10.1016/j.nimb.2013.04.049
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2013SO11      Phys.Rev. C 87, 054329 (2013)

L.G.Sobotka, W.W.Buhro, R.J.Charity, J.M.Elson, M.F.Jager, J.Manfredi, M.H.Mahzoon, A.M.Mukhamedzhanov, V.Eremenko, M.McCleskey, R.G.Pizzone, B.T.Roeder, A.Spiridon, E.Simmons, L.Trache, M.Kurokawa, P.Navratil

Proton decay of excited states in 12N and 13O and the astrophysical 11C(p, γ)12N reaction rate

NUCLEAR REACTIONS 9Be(13O, X), E=30.3 MeV/nucleon, [13O secondary beam from 1H(14N, X), E=38 MeV/nucleon primary reaction]; measured particle spectra, E(p), I(p), widths using MARS spectrometer at Texas AM cyclotron facility. Invariant mass method. R-matrix analysis. 11C, 12N, 13O; deduced levels, J, π, one-proton and two-proton decay branching ratios. 11C(p, γ)12N; deduced astrophysical reaction rates and S(E) factors.

doi: 10.1103/PhysRevC.87.054329
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2012BA33      Phys.Rev. C 86, 015806 (2012), Erratum Phys.Rev. C 86, 039901 (2012)

A.Banu, F.Carstoiu, N.L.Achouri, W.N.Catford, M.Chartier, B.Fernandez-Dominguez, M.Horoi, B.Laurent, N.A.Orr, S.Paschalis, N.Patterson, B.Pietras, B.T.Roeder, P.Roussel-Chomaz, J.S.Thomas, L.Trache, R.E.Tribble

One-proton breakup of 24Si and the 23Al(p, γ)24Si reaction in type I x-ray bursts

NUCLEAR REACTIONS 12C(24Si, X)23Al, [24Si secondary beam from C(32S, X), E=95 MeV/nucleon primary reaction], E=61 MeV/nucleon; measured fragment spectra, σ, inclusive longitudinal momentum distribution, time-of-flight of 23Al fragments using SPEG spectrograph at GANIL; deduced spectroscopic factors, asymptotic normalization coefficient (ANC). Glauber-type analysis. Comparison with large-scale shell model calculations. 23Al(p, γ)24Si, E<1 MeV; deduced stellar reaction rates. Discussed astrophysical significance of 23Al(p, γ)24Si in type I x-ray bursts (XRB) nucleosynthesis. Waiting-point nuclei and relevance to 22Na abundance and sequential 2p capture on 22Mg at high temperature.

doi: 10.1103/PhysRevC.86.015806
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2012BA46      J.Phys.:Conf.Ser. 337, 012059 (2012)

A.Banu, F.Carstoiu, W.N.Catford, B.Fernandez-Dominguez, M.Horoi, N.A.Orr, B.T.Roeder, P.Roussel-Chomaz, L.Trache, R.E.Tribble

Direct radiative proton capture 23Al(p, γ)24Si studied via one-proton nuclear breakup of 24Si

NUCLEAR REACTIONS 12C(24Si, p23Al), E=20-60 MeV/nucleon; measured Eγ, Iγ, (fragment)γ-coin, reaction products using SPEG energy-loss spectrometer; deduced 23Al momentum distribution; calculated 23Al momentum distribution using Glauber-type approach.

doi: 10.1088/1742-6596/337/1/012059
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2012FO09      Nucl.Instrum.Methods Phys.Res. A678, 1 (2012)

C.M.Folden III, M.C.Alfonso, D.A.Mayorov, K.R.Lawrence, A.A.Alharbi, E.Berdugo, P.J.Cammarata, A.C.Raphelt, B.T.Roeder, T.A.Werke

Development of the MARS separator for heavy element studies

NUCLEAR REACTIONS 165Ho(40Ar, xnyp)197Po/197mPo/198Po/198At/199Po/199mPo/199At/200At, E=220.2 MeV; measured Eα, half-lives, (EVR)α correlations, excitation functions, σ for production of heavy-element studies using MARS separator at Texas A

doi: 10.1016/j.nima.2012.02.035
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2012GO11      J.Phys.:Conf.Ser. 337, 012008 (2012)

V.Z.Goldberg, B.T.Roeder, G.V.Rogachev, G.G.Chubarian, E.D.Johnson, C.Fu, A.A.Alharbi, M.L.Avila, A.Banu, M.McCleskey, J.P.Mitchell, E.Simmons, G.Tabacaru, L.Trache, R.E.Tribble

Resonance Scattering to Study Exotic Nuclei at the Limits of Stability

NUCLEAR REACTIONS 1H(13O, 13O), E≈11 MeV/nucleon;measured thick target charged reaction products. 14F deduced levels, widths, J, π, σ(θ); calculated 14F resonance levels, widths, J, π, σ(θ) using R-matrix, 14F levels, J, π using shell model and ab initio calculations. 1H(8He, 8He), E=cyclotron; calculated, re-analyzed published results considering virtual 2s resonance in 9He.

doi: 10.1088/1742-6596/337/1/012008
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2012JA11      Phys.Rev. C 86, 011304 (2012);Erratum Phys.Rev. C 86, 059902 (2012)

M.F.Jager, R.J.Charity, J.M.Elson, J.Manfredi, H.Mohammad, L.G.Sobotka, M.McCleskey, R.G.Pizzone, B.T.Roeder, A.Spiridon, E.Simmons, L.Trache, M.Kurokawa

Two-proton decay of 12O and its isobaric analog state in 12N

NUCLEAR REACTIONS 9Be(13O, 12O), (13O, 12N), [13O secondary beam from 1H(14N, X), E=38 MeV/nucleon primary reaction], E=30.3 MeV/nucleon]; measured excitation energy spectra for p+11C, p+12C, 2p+10C, 2p+10B events. Two proton decay modes of g.s. of 12O and excited states of 12O and 12N. 12O, 12N; deduced levels, J, π, widths, IAS of 12O g.s. in 12N. 10B; deduced level, IAS in 10B from 2p decay of IAS in 12N. 13N; deduced level, J, π.

RADIOACTIVITY 12O(2p)[9Be(13O, 12O), E=30.3 MeV/nucleon](2p); measured total excitation energy spectra for decay of g.s. of 12O.

ATOMIC MASSES 12O, 12N; analyzed isobaric multiplet mass equation (IMME) for A=12 quintet; deduced mass excesses using the invariant mass method.

doi: 10.1103/PhysRevC.86.011304
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2012TR08      J.Phys.:Conf.Ser. 337, 012058 (2012)

L.Trache, A.Banu, J.C.Hardy, V.E.Iacob, M.McCleskey, B.T.Roeder, E.Simmons, A.Spiridon, R.E.Tribble, A.Saastamoinen, A.Jokinen, J.Aysto, T.Davinson, G.Lotay, P.J.Woods, E.Pollacco

Decay spectroscopy for nuclear astrophysics: β- and β-delayed proton decay

RADIOACTIVITY 23Al, 27P, 31Cl(EC), (β+p) [from 1H(24Mg, X), E=48 MeV/nucleon; 1H(28Si, X), (32S, X), E=40 MeV/nucleon]; measured β-delayed Ep, Ip using DSSSD (double-sided strip Si detector), Iβ using Si detector, pβ-coin, Eγ, Iγ using HPGe, βγ-coin. 23Al deduced mass excess, partial decay scheme, levels, J, π, resonance strength, proton branching, isomeric decay, T1/2, IAS, log ft. Only the 23Al results presented.

doi: 10.1088/1742-6596/337/1/012058
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2012WA15      Phys.Lett. B 712, 59 (2012)

J.P.Wallace, P.J.Woods, G.Lotay, A.Alharbi, A.Banu, H.M.David, T.Davinson, M.McCleskey, B.T.Roeder, E.Simmons, A.Spiridon, L.Trache, R.E.Tribble

β-Delayed proton-decay study of 20Mg and its implications for the 19Ne(p, γ)20Na breakout reaction in X-ray bursts

RADIOACTIVITY 20Mg(β+p) [from 3He(20Ne, 3n)20Mg, E=25 MeV/nucleon]; measured decay products, Eβ, Iβ, Ep, Ip. 19Ne; deduced proton energy spectrum, resonant states, resonance strengths.

doi: 10.1016/j.physletb.2012.04.046
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2011BA27      Phys.Rev. C 84, 015803 (2011)

A.Banu, L.Trache, F.Carstoiu, N.L.Achouri, A.Bonaccorso, W.N.Catford, M.Chartier, M.Dimmock, B.Fernandez-Dominguez, M.Freer, L.Gaudefroy, M.Horoi, M.Labiche, B.Laurent, R.C.Lemmon, F.Negoita, N.A.Orr, S.Paschalis, N.Patterson, E.S.Paul, M.Petri, B.Pietras, B.T.Roeder, F.Rotaru, P.Roussel-Chomaz, E.Simmons, J.S.Thomas, R.E.Tribble

Structure of 23Al from the one-proton breakup reaction and astrophysical implications

NUCLEAR REACTIONS 12C(23Al, 22Mg), [23Al secondary beam from C(32S, X)E=95 MeV/nucleon primary reaction], E=57 MeV/nucleon; measured fragment spectra, inclusive and exclusive longitudinal momentum distributions, and widths, Eγ, (fragment)γ-coin. 22Mg; deduced levels, J, π, σ, spectroscopic factors, asymptotic normalization coefficients. 23Al; deduced g.s. Jπ, configuration mixing. Comparison with Glauber and large-scale shell model calculations. 22Mg(p, γ)23Al, E<1 MeV; deduced stellar reaction rates; discussed astrophysical significance of 22Na nucleosynthesis in ONe novae.

doi: 10.1103/PhysRevC.84.015803
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2011RO60      Nucl.Instrum.Methods Phys.Res. A 634, 71 (2011)

B.T.Roeder, M.Mccleskey, L.Trache, A.A.Alharbi, A.Banu, S.Cherubini, T.Davinson, V.Z.Goldberg, M.Gulino, R.G.Pizzone, E.Simmons, R.Sparta, A.Spiridon, C.Spitaleri, J.P.Wallace, R.E.Tribble, P.J.Woods

The Texas-Edinburgh-Catania Silicon Array (TECSA): A detector for nuclear astrophysics and nuclear structure studies with rare isotope beams

NUCLEAR REACTIONS 2H(14C, p), 14C(d, p), E=163.8 MeV; measured products, 15C, Eπ, Iπ; deduced σ(θ). Data were imported from EXFOR entry C1826.

doi: 10.1016/j.nima.2011.01.035
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2011SA15      Phys.Rev. C 83, 045808 (2011)

A.Saastamoinen, L.Trache, A.Banu, M.A.Bentley, T.Davinson, J.C.Hardy, V.E.Iacob, M.McCleskey, B.T.Roeder, E.Simmons, G.Tabacaru, R.E.Tribble, P.J.Woods, J.Aysto

Experimental study of β-delayed proton decay of 23Al for nucleosynthesis in novae

RADIOACTIVITY 23Al(β+), (β+p); measured E(p), I(p), Eγ, Iγ, βγ-, βp-coin. 22Na, 23Mg; deduced levels, J, π, widths, IAS of 23Al, resonance strength at 7787 keV and its contribution to the reaction rates for 22Na(p, γ) reaction at typical nova peak temperatures.

doi: 10.1103/PhysRevC.83.045808
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2010GO16      Phys.Lett. B 692, 307 (2010)

V.Z.Goldberg, B.T.Roeder, G.V.Rogachev, G.G.Chubarian, E.D.Johnson, C.Fu, A.A.Alharbi, M.L.Avila, A.Banu, M.McCleskey, J.P.Mitchell, E.Simmons, G.Tabacaru, L.Trache, R.E.Tribble

First observation of 14F

NUCLEAR REACTIONS 1H(13O, X)14F, E=31 MeV/nucleon; 1H(14O, 14O), E=154 MeV; measured reaction products, proton spectra; deduced σ(θ), J, π, level scheme, resonances. Comparison with shell model calculations.

doi: 10.1016/j.physletb.2010.07.054
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1815. Data from this article have been entered in the XUNDL database. For more information, click here.


2010JO08      J.Phys.:Conf.Ser. 205, 012011 (2010)

E.D.Johnson, G.V.Rogachev, V.Z.Goldberg, S.Brown, D.Robson, A.M.Crisp, P.D.Cottle, C.Fu, J.Giles, B.W.Green, K.W.Kemper, K.Lee, B.T.Roeder, R.E.Tribble

Clustering in N ≠ Z nuclei

NUCLEAR REACTIONS 4He(14C, 14C), E=25 MeV; measured resonance elastic scattering, Eα, Iα(θ); deduced σ, σ(θ); calculated σ, σ(θ) using R-matrix; deduced resonance parameters, α-widths, n-widths. 4He(14C, 18O), E≈1-100 keV; calculated, analyzed reaction data using DWBA σ and Coulomb modified ANC; deduced reaction rates, asymptotic normalization coefficients, influence of cluster resonant and nonresonant capture.

doi: 10.1088/1742-6596/205/1/012011
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2010RE05      Phys.Rev. C 81, 067303 (2010)

R.R.Reynolds, P.D.Cottle, A.Gade, D.Bazin, C.M.Campbell, J.M.Cook, T.Glasmacher, P.G.Hansen, T.Hoagland, K.W.Kemper, W.F.Mueller, B.T.Roeder, J.R.Terry, J.A.Tostevin

25Si and 29S studied via single neutron knockout reactions

NUCLEAR REACTIONS 9Be(26Si, 25Si), E=109 MeV/nucleon; 9Be(30S, 29S), E=103 MeV/nucleon, [secondary beams of 26Si and 30S from primary 9Be(36Ar, X), E=150 MeV/nucleon]; measured Eγ, Iγ, (particle)γ-coin, σ using SeGA array. 25Si, 29S; deduced levels, J, π. Comparisons with previous experimental data, mirror nuclei 25Na and 29Al, and shell model calculations.

doi: 10.1103/PhysRevC.81.067303
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2009JO08      Eur.Phys.J. A 42, 135 (2009)

E.D.Johnson, G.V.Rogachev, V.Z.Goldberg, S.Brown, D.Robson, A.M.Crisp, P.D.Cottle, C.Fu, J.Giles, B.W.Green, K.W.Kemper, K.Lee, B.T.Roeder, R.E.Tribble

Extreme α-clustering in the 18O nucleus

NUCLEAR REACTIONS 4He(14C, 14C), E=25 MeV; measured σ(E, θ). 18O; deduced levels, widths, J, π using R-matrix analysis.

doi: 10.1140/epja/i2009-10887-1
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2008CR03      Phys.Rev. C 77, 044315 (2008)

A.M.Crisp, B.T.Roeder, O.A.Momotyuk, N.Keeley, K.W.Kemper, F.Marechal, K.Rusek, W.Weintraub, M.Wiedeking

Survey of 17O excited states selectively populated by five-particle transfer reactions

NUCLEAR REACTIONS 12C(7Li, d), E=34 MeV; measured deuteron spectra, angular distributions. 12C(6Li, p), E=32 MeV; measured proton spectra, angular distributions. 17O; deduced levels, J, π, level widths, σ. DWBA analysis.

doi: 10.1103/PhysRevC.77.044315
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2007RO17      Nucl.Instrum.Methods Phys.Res. B261, 1005 (2007)

F.J.Rodriguez, J.A.Liendo, B.T.Roeder, W.Weintraub, K.W.Kemper, N.Keeley, F.Marechal

Spin and parity determinations of excited 15N based on polarized and unpolarized 12C(7Li, α)15N reaction data at Elab = 34 MeV

NUCLEAR REACTIONS 12N(7Li, α), E=34 MeV; measured Eα, cross sections, angular distributions and analyzing powers. 15N deduced levels, J, π.

doi: 10.1016/j.nimb.2007.03.039
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2007RU01      Phys.Rev. C 75, 024612 (2007)

A.T.Rudchik, K.W.Kemper, A.A.Rudchik, A.M.Crisp, V.D.Chesnokova, V.M.Kyryanchuk, F.Marechal, O.A.Momotyuk, O.A.Ponkratenko, B.T.Roeder, K.Rusek

Tensor analyzing powers and energy dependence of the 7Li+16O interaction

NUCLEAR REACTIONS 16O(polarized 7Li, 7Li), E=42 MeV; measured σ(θ), tensor analyzing powers. 16O(7Li, 7Li), (7Li, 7Li'), E(cm)=6.26-34.78 MeV; analyzed data; deduced parameters. 16O(7Li, t), E=15-38 MeV; calculated σ(θ). Coupled reaction channels method.

doi: 10.1103/PhysRevC.75.024612
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2006GA31      Phys.Rev. C 74, 034322 (2006)

A.Gade, B.A.Brown, D.Bazin, C.M.Campbell, J.A.Church, D.C.Dinca, J.Enders, T.Glasmacher, M.Horoi, Z.Hu, K.W.Kemper, W.F.Mueller, T.Otsuka, L.A.Riley, B.T.Roeder, T.Suzuki, J.R.Terry, K.L.Yurkewicz, H.Zwahlen

Evolution of the E(1/2+1) - E(3/2+1) energy spacing in odd-mass K, Cl, and P isotopes for N = 20-28

NUCLEAR REACTIONS H, C(46Ar, X)43Cl/45Cl, E=76.4 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin. 45Cl deduced level energy.

NUCLEAR STRUCTURE 35,37,39,41,43P, 37,39,41,43,45Cl, 39,41,43,45,47K; analyzed level energies, splitting.

doi: 10.1103/PhysRevC.74.034322
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2006JO11      Phys.Rev.Lett. 97, 192701 (2006)

E.D.Johnson, G.V.Rogachev, A.M.Mukhamedzhanov, L.T.Baby, S.Brown, W.T.Cluff, A.M.Crisp, E.Diffenderfer, V.Z.Goldberg, B.W.Green, T.Hinners, C.R.Hoffman, K.W.Kemper, O.Momotyuk, P.Peplowski, A.Pipidis, R.Reynolds, B.T.Roeder

Astrophysical Reaction Rate for the Neutron-Generator Reaction 13C(α, n)16O in Asymptotic Giant Branch Stars

NUCLEAR REACTIONS 6Li(13C, d), E=8.0, 8.5 MeV; measured deuteron spectra, σ(E, θ); deduced asymptotic normalization coefficient for subthreshold resonance. 13C(α, n), E ≈ 0-1 MeV; deduced astrophysical S-factor, reaction rates.

doi: 10.1103/PhysRevLett.97.192701
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2006MO24      Phys.Lett. B 640, 13 (2006)

O.A.Momotyuk, N.Keeley, K.W.Kemper, B.T.Roeder, A.M.Crisp, W.Cluff, B.G.Schmidt, M.Wiedeking, F.Marechal, K.Rusek, S.Yu.Mezhevych, J.Liendo

Target structure independent 7Li(pol) elastic scattering at low momentum transfers

NUCLEAR REACTIONS 6,7Li(polarized 7Li, 7Li), E=42 MeV; 12C(polarized 7Li, 7Li), E=34 MeV; measured σ(θ), analyzing powers; deduced optical model parameters. Optical model and coupled reactions channels model analysis.

doi: 10.1016/j.physletb.2006.07.038
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2006OB03      Phys.Rev. C 73, 044605 (2006)

A.Obertelli, A.Gade, D.Bazin, C.M.Campbell, J.M.Cook, P.D.Cottle, A.D.Davies, D.-C.Dinca, T.Glasmacher, P.G.Hansen, T.Hoagland, K.W.Kemper, J.-L.Lecouey, W.F.Mueller, R.R.Reynolds, B.T.Roeder, J.R.Terry, J.A.Tostevin, K.Yoneda, H.Zwahlen

Population of bound excited states in intermediate-energy fragmentation reactions

NUCLEAR REACTIONS 9Be(24Mg, X), (25Al, X), (34Ar, X)18Ne/21Na, E ≈ 90-110 MeV/nucleon; 9Be(26Si, X)18Ne/24Si, E ≈ 109 MeV/nucleon; 9Be(28Mg, X)26Ne, E ≈ 82 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin; deduced relative population of excited states, reaction mechanism features.

doi: 10.1103/PhysRevC.73.044605
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2006RO34      Phys.Rev. C 74, 034602 (2006)

B.T.Roeder, K.W.Kemper, N.Aoi, D.Bazin, M.Bowen, C.M.Campbell, J.M.Cook, D.-C.Dinca, A.Gade, T.Glasmacher, H.Iwasaki, S.Kanno, T.Motobayashi, W.F.Mueller, T.Nakamura, H.Sakurai, H.Suzuki, S.Takeuchi, J.R.Terry, K.Yoneda, H.Zwahlen

Production cross sections for heavy-ion fragmentation reactions on a liquid deuterium target at intermediate energies

NUCLEAR REACTIONS 2H(48Ca, X)48Sc/47Ca/46Ca/48K/47K/46K/45K/44K/45Ar/44Ar/42Ar/42Cl/40Cl/39Cl, E=102 MeV/nucleon; 2H(40S, X)40Cl/39S/38S/37P/36P/34Si/33Si/32Al/31Al, E=99.3 MeV/nucleon; 2H(42S, X)42Cl/42S/40S/39P/38P/37P/36Si/35Si/33Al/32Al, E=99.8 MeV/nucleon; measured production σ. Comparison with model predictions, fragmentation from Be and Ta targets.

doi: 10.1103/PhysRevC.74.034602
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2006YO05      Phys.Rev. C 74, 021303 (2006)

K.Yoneda, A.Obertelli, A.Gade, D.Bazin, B.A.Brown, C.M.Campbell, J.M.Cook, P.D.Cottle, A.D.Davies, D.-C.Dinca, T.Glasmacher, P.G.Hansen, T.Hoagland, K.W.Kemper, J.-L.Lecouey, W.F.Mueller, R.R.Reynolds, B.T.Roeder, J.R.Terry, J.A.Tostevin, H.Zwahlen

Two-neutron knockout from neutron-deficient 34Ar, 30S, and 26Si

NUCLEAR REACTIONS 9Be(34Ar, 32ArX), (30S, 28SX), (26Si, 24SiX), E ≈ 110 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin, parallel momentum distributions, yields following two-neutron knockout; deduced inclusive σ, reaction mechanism features. 24Si, 28S, 32Ar deduced levels, J, π.

doi: 10.1103/PhysRevC.74.021303
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2005GA18      Phys.Rev. C 71, 051301 (2005)

A.Gade, D.Bazin, C.A.Bertulani, B.A.Brown, C.M.Campbell, J.A.Church, D.C.Dinca, J.Enders, T.Glasmacher, P.G.Hansen, Z.Hu, K.W.Kemper, W.F.Mueller, H.Olliver, B.C.Perry, L.A.Riley, B.T.Roeder, B.M.Sherrill, J.R.Terry, J.A.Tostevin, K.L.Yurkewicz

Knockout from 46Ar:l=3 neutron removal and deviations from eikonal theory

NUCLEAR REACTIONS 9Be(46Ar, 45ArX), E=70 MeV/nucleon; measured Eγ, Iγ, fragments parallel momentum distributions following one-neutron removal; deduced dissipative effects. 45Ar levels deduced branching ratios, spectroscopic factors. Comparison with eikonal theory.

doi: 10.1103/PhysRevC.71.051301
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2005GA54      Eur.Phys.J. A 25, Supplement 1, 251 (2005)

A.Gade, D.Bazin, B.A.Brown, C.M.Campbell, J.A.Church, D.-C.Dinca, J.Enders, T.Glasmacher, P.G.Hansen, Z.Hu, K.W.Kemper, W.F.Mueller, H.Olliver, B.C.Perry, L.A.Riley, B.T.Roeder, B.M.Sherrill, J.R.Terry, J.A.Tostevin, K.L.Yurkewicz

Spectroscopic factors in exotic nuclei from nucleon-knockout reactions

NUCLEAR REACTIONS 9Be(32S, 31SX), (33Cl, 32ClX), (32Ar, 31ArX), (34Ar, 33ArX), E≈ 65 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin, particle momentum distributions; deduced one-neutron removal σ. 31S, 32Cl, 31,33Ar levels deduced spectroscopic factors. Comparison with shell model predictions.

doi: 10.1140/epjad/i2005-06-177-x
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2005RI11      Phys.Rev. C 72, 024311 (2005)

L.A.Riley, M.A.Abdelqader, D.Bazin, M.J.Bojazi, B.A.Brown, C.M.Campbell, J.A.Church, P.D.Cottle, D.-C.Dinca, J.Enders, A.Gade, T.Glasmacher, M.Honma, S.Horibe, Z.Hu, K.W.Kemper, W.F.Mueller, H.Olliver, T.Otsuka, B.C.Perry, B.T.Roeder, B.M.Sherrill, T.P.Spencer, J.R.Terry

Thick-target inverse-kinematics proton scattering from 46Ar and the N = 28 shell below 48Ca

NUCLEAR REACTIONS 1H, C(46Ar, 46Ar'), E ≈ 68 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin. 46Ar deduced levels, J, π, B(E2), deformation lengths. Optical model analysis.

NUCLEAR STRUCTURE 46Ar, 48Ca, 50Ti, 52Cr, 54Fe; calculated B(E2), ratio of neutron-to-proton transition matrix elements.

doi: 10.1103/PhysRevC.72.024311
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1494. Data from this article have been entered in the XUNDL database. For more information, click here.


2005WI05      Phys.Rev.Lett. 94, 132501 (2005)

M.Wiedeking, S.L.Tabor, J.Pavan, A.Volya, A.L.Aguilar, I.J.Calderin, D.B.Campbell, W.T.Cluff, E.Diffenderfer, J.Fridmann, C.R.Hoffman, K.W.Kemper, S.Lee, M.A.Riley, B.T.Roeder, C.Teal, V.Tripathi, I.Wiedenhover

p-sd Shell Gap Reduction in Neutron-Rich Systems and Cross-Shell Excitations in 20O

NUCLEAR REACTIONS 10Be(14C, α), E=21.4 MeV; measured Eγ, Eα, αγ-, γγ-coin. 20O deduced levels, J, π, core excitation. Comparison with shell model predictions.

doi: 10.1103/PhysRevLett.94.132501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2004GA15      Phys.Rev. C 69, 034311 (2004)

A.Gade, D.Bazin, B.A.Brown, C.M.Campbell, J.A.Church, D.C.Dinca, J.Enders, T.Glasmacher, P.G.Hansen, Z.Hu, K.W.Kemper, W.F.Mueller, H.Olliver, B.C.Perry, L.A.Riley, B.T.Roeder, B.M.Sherrill, J.R.Terry, J.A.Tostevin, K.L.Yurkewicz

One-neutron knockout reactions on proton-rich nuclei with N = 16

NUCLEAR REACTIONS 9Be(32S, 31SX), (34Ar, 33ArX), (33Cl, 32ClX), E ≈ 65 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin, particle momentum distributions; deduced one-neutron removal σ. 31S, 33Ar, 32Cl levels deduced spectroscopic factors. Comparison with shell model predictions.

doi: 10.1103/PhysRevC.69.034311
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2228. Data from this article have been entered in the XUNDL database. For more information, click here.


2004GA33      Phys.Rev.Lett. 93, 042501 (2004)

A.Gade, D.Bazin, B.A.Brown, C.M.Campbell, J.A.Church, D.C.Dinca, J.Enders, T.Glasmacher, P.G.Hansen, Z.Hu, K.W.Kemper, W.F.Mueller, H.Olliver, B.C.Perry, L.A.Riley, B.T.Roeder, B.M.Sherrill, J.R.Terry, J.A.Tostevin, K.L.Yurkewicz

Reduced Occupancy of the Deeply Bound 0d5/2 Neutron State in 32Ar

NUCLEAR REACTIONS 9Be(32Ar, 31ArX), E=65.1 MeV/nucleon; measured σ, longitudinal momentum distribution; deduced spectroscopic factor. 32Ar deduced occupancy of deeply-bound neutron state. Role of large neutron separation energy discussed.

doi: 10.1103/PhysRevLett.93.042501
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2003GA20      Phys.Rev. C 68, 014302 (2003)

A.Gade, D.Bazin, C.M.Campbell, J.A.Church, D.C.Dinca, J.Enders, T.Glasmacher, Z.Hu, K.W.Kemper, W.F.Mueller, H.Olliver, B.C.Perry, L.A.Riley, B.T.Roeder, B.M.Sherrill, J.R.Terry

Detailed experimental study on intermediate-energy Coulomb excitation of 46Ar

NUCLEAR REACTIONS 197Au(46Ar, 46Ar'), E=76.4 MeV; measured Eγ, Iγ, (particle)γ-coin following projectile Coulomb excitation. 46Ar levels deduced excitation B(E2). Highly-segmented Ge detectors, high-resolution spectrograph.

doi: 10.1103/PhysRevC.68.014302
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1677.


2003KE13      Phys.Rev. C 68, 054601 (2003)

N.Keeley, J.M.Cook, K.W.Kemper, B.T.Roeder, W.D.Weintraub, F.Marechal, K.Rusek

Effect of E1 excitations to the continuum: 6He and 6Li + 209Bi compared

NUCLEAR REACTIONS 209Bi(6Li, 6Li), E=29.9, 32.8 MeV; 209Bi(6He, 6He), (6He, 2nα), E=19.0, 22.5 MeV; measured σ(θ); deduced total σ, optical model parameters, role of E1 excitations to the continuum. Continuum-discretized coupled channels calculations.

doi: 10.1103/PhysRevC.68.054601
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0956.


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