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NSR database version of May 23, 2024.

Search: Author = R.Charity

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2023BE26      Phys.Rev. C 108, L061301 (2023)

T.Beck, A.Gade, B.A.Brown, J.A.Tostevin, D.Weisshaar, D.Bazin, K.W.Brown, R.J.Charity, P.J.Farris, S.A.Gillespie, A.M.Hill, J.Li, B.Longfellow, W.Reviol, D.Rhodes

Probing proton cross-shell excitations through the two-neutron removal from 38Ca

doi: 10.1103/PhysRevC.108.L061301
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2023CH22      Phys.Rev. C 107, 054301 (2023)

R.J.Charity, K.Brown, T.Webb, L.G.Sobotka

Invariant-mass spectroscopy of 10B, 11C, 14F, 16F, and 18Na

NUCLEAR REACTIONS 9Be(15O, X)16F/18Na/11C/10B, E=48.1 MeV/nucleon; 9Be(17Ne, X)16F/18Na/11C/10B, E=48.1 MeV/nucleon; measured charged particle spectra, angular distributions, Eγ, Iγ, γ(θ), (particle)γ-coin; deduced invariant mass-spectrum. 9Be(13O, X)14F/11C/10B, E=69.5 MeV/nucleon; measured charged particles, (particle)(particle)-coin; deduced invariant mass-spectrum. 16,14F, 18Na; deduced levels, J, π, S(p), proton-decay widths, nγ-decay widths, d-wave resonances spectroscopic factors. 10B; deduced levels, J, π, 4+ state - member of T=1 rotational band. 11C; deduced levels, J, π from analysis of invariant-mass spectrum of 2α+3He and 6Li+α+p events. Comparison to previous experimental data and shell-model calculations. Systematics of analog rotational bands in 10C, 10B and 10Be. High-resolution array (HiRA) consisting of 14 Si-CsI(Tl) at NSCL (MSU). For the experiments with 15O and 17Ne beams setup was extended by CAESAR (CAESium iodide ARray) consisted of 158 CsI(Na) crystals.

doi: 10.1103/PhysRevC.107.054301
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2023CH46      Phys.Rev.Lett. 131, 172501 (2023)

R.J.Charity, J.Wylie, S.M.Wang, T.B.Webb, K.W.Brown, G.Cerizza, Z.Chajecki, J.M.Elson, J.Estee, D.E.M.Hoff, S.A.Kuvin, W.G.Lynch, J.Manfredi, N.Michel, D.G.McNeel, P.Morfouace, W.Nazarewicz, C.D.Pruitt, C.Santamaria, S.Sweany, J.Smith, L.G.Sobotka, M.B.Tsang, A.H.Wuosmaa

Strong Evidence for 9N and the Limits of Existence of Atomic Nuclei

RADIOACTIVITY 9N(p), 8C, 6Be(2p) [from 9Be(13O, X)9N, E=69.5 MeV/nucleon]; measured decay products, Ep, Ip. 9N, 8C; deduced invariant-mass spectra, level diagrams, possible single resonancelike peak in the spectrum. R-matrix fits, comparison with the theoretical predictions of an open-quantum-system approach. The National Superconducting Cyclotron Laboratory at Michigan State University.

doi: 10.1103/PhysRevLett.131.172501
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2023CH47      Phys.Rev. C 108, 044318 (2023)

R.J.Charity, L.G.Sobotka

Invariant-mass spectroscopy in projectile fragmentation reactions

doi: 10.1103/PhysRevC.108.044318
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2023DR01      Phys.Rev. C 107, 034306 (2023)

N.Dronchi, D.Weisshaar, B.A.Brown, A.Gade, R.J.Charity, L.G.Sobotka, K.W.Brown, W.Reviol, D.Bazin, P.J.Farris, A.M.Hill, J.Li, B.Longfellow, D.Rhodes, S.N.Paneru, S.A.Gillespie, A.Anthony, E.Rubino, S.Biswas

Measurement of the B(E2 ↑) strengths of 36Ca and 38Ca

NUCLEAR REACTIONS 197Au(36Ca, 36Ca), E=76.9 MeV/nucleon; 197Au(38Ca, 38Ca), E=69.1 MeV/nucleon; 197Au(34Ar, 34Ar), E not given; measured reaction products, Eγ, Iγ; deduced σ and B(E2) for the excitation of the first 2+ (34Ar was present as contamination). 36Ca; deduced proton decay branching ratio for 2 state proton unbound state, spectroscopic factors, charge radii difference with mirror nuclei 36S. 35K(p, γ), T=0.5-2 GK; deduced reaction rate using obtained in this paper values for the 36Ca B(E2) and proton branching ratio. GRETINA HPGe array and the S800 spectrograph used to measure the γ-decay following Coulomb excitation. CAESAR CsI(Na) array and the S800 spectrograph used to measure the p/γ- branching ratio in 36Ca. Systematics of first 2+ states energy and B(E2) for Ca isotopes. Beam produced from fragmentation reaction 9Be(40Ca, X), E=140 MeV/nucleon at Coupled Cyclotron Facility (NSCL).

NUCLEAR STRUCTURE 36,38,40,42,44,46,48,50Ca, 36S, 38Ar; calculated energy of first 2+ state, B(E2) for the excitation of first 2+ state. Shell model calculations with ZBM2, USDB, spdfu-mix and GXPF1A interactions. Comparison to experimental data.

doi: 10.1103/PhysRevC.107.034306
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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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2022CH02      Phys.Rev. C 105, 014314 (2022)

R.J.Charity, L.G.Sobotka, T.B.Webb, K.W.Brown

Two-proton decay from α-cluster states in 10C and 11N

NUCLEAR STRUCTURE 10C, 11N; analyzed 2p+2α for 10C and 3p+2α exit channels for two-proton decay and highly fragmented decay channels using invariant-mass data from four previous experiments at NSCL-MSU, and Texas A and M facility involving inelastic scattering, multinucleon knockout, and neutron-pickup reactions; deduced a number of democratic 2p emitters associated with α-cluster structure, Correlation plots for the two-proton decay of the second 3/2- state in 11N and second 0+ state in 10C. 10C; deduced levels, J, π, α-cluster states, rotational band built on the second 0+ (Hoyle) state with α-cluster molecular structure, prompt 2p decay from excited states, decay channels and their branching ratios, compared with level structure of mirror nucleus 10Be. 11N; deduced levels, J, π, Γ, molecular band built on the second 3/2- state, decaying by 2p-channel, compared with level structure of mirror nucleus 11Be. Discussed possible 2n-decay of neutron-rich cluster configurations.

doi: 10.1103/PhysRevC.105.014314
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2022GA31      Phys.Rev.Lett. 129, 242501 (2022)

A.Gade, B.A.Brown, D.Weisshaar, D.Bazin, K.W.Brown, R.J.Charity, P.Farris, A.M.Hill, J.Li, B.Longfellow, D.Rhodes, W.Reviol, J.A.Tostevin

Dissipative Reactions with Intermediate-Energy Beams: A Novel Approach to Populate Complex-Structure States in Rare Isotopes

NUCLEAR REACTIONS 9Be(38Ca, 38Ca'), E=60.9 MeV/nucleon; measured reaction products, Eγ, Iγ. 38Ca; deduced γ-ray energies and relative intensities, partial level scheme, multiparticle-multihole excited states, negative-parity, complex-structure final states. Comparison with shell model calculations. The Coupled Cyclotron Facility at NSCL, GRETINA array.

doi: 10.1103/PhysRevLett.129.242501
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2022GA32      Phys.Rev. C 106, 064303 (2022)

A.Gade, D.Weisshaar, B.A.Brown, D.Bazin, K.W.Brown, R.J.Charity, P.Farris, A.M.Hill, J.Li, B.Longfellow, D.Rhodes, W.Reviol, J.A.Tostevin

Exploiting dissipative reactions to perform in-beam γ-ray spectroscopy of the neutron-deficient isotopes 38, 39Ca

NUCLEAR REACTIONS 9Be(38Ca, 38Ca), (38Ca, 39Ca), E=60.9 MeV/nucleon; measured reaction products Eγ, Iγ, γγ-coin, (particle)γ-coin. 38,39Ca; deduced levels, J, π, high-spin states. Comparison to shell-model calculations using the FSU spsdf p interaction and experimental results for 39K mirror nuclei. High resolution γ-ray tracking array GRETINA coupled with S800 spectroraph. Beam from fragmentation of 40Ca 140 MeV/nucleon primary beam on 9Be target in the A1900 separator at Coupled Cyclotron Facility (NSCL).

doi: 10.1103/PhysRevC.106.064303
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2022GI04      Phys.Rev. C 105, 044321 (2022)

S.A.Gillespie, K.W.Brown, R.J.Charity, L.G.Sobotka, A.K.Anthony, J.Barney, A.Bonaccorso, B.A.Brown, J.Crosby, D.Dell'Aquila, J.Elson, J.Estee, A.Gade, M.Ghazali, G.Jhang, Y.Jin, B.Longfellow, W.G.Lynch, J.Pereira, M.Spieker, S.Sweany, F.C.E.Teh, A.Thomas, M.B.Tsang, C.Y.Tsang, D.Weisshaar, H.Y.Wu, K.Zhu

Proton decay spectroscopy of 28S and 30Cl

NUCLEAR REACTIONS 9Be(29S, n), (31Ar, p), E=150 MeV/nucleon; measured reaction products, Ep, Ip, Eγ, Iγ, (particle)p-coin, pγ-coin; deduced invariant mass, momentum distribution. Setup consisting of S800 spectrograph, Si-CsI(Tl) DSSD array of 128 concentric rings and 128 annular sectors, CAESAR CsI(Na) photon detection array, BC-400-type scintillation fiber detector at A1900 fragment separator (NSCL).

RADIOACTIVITY 28S(p), (2p) [from 9Be(29S, n), E=150 MeV/nucleon]; 30Cl(p), (2p) [from 9Be(29S, n), E=150 MeV/nucleon]; measured Ep, Ip, Eγ, Iγ, pγ-coin; deduced total decay kinetic energy, decay energy spectrum. 30Cl; deduced levels, J, π, S(p). 28S; deduced levels, J, π, spectroscopic factors. Comparison to previous experimental results and shell model calculations.

doi: 10.1103/PhysRevC.105.044321
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2022WA33      J.Phys.(London) G49, 10LT02 (2022)

S.M.Wang, W.Nazarewicz, R.J.Charity, L.G.Sobotka

Nucleon-nucleon correlations in the extreme oxygen isotopes

RADIOACTIVITY 11,12O(2p), 26O(2n); calculated density distributions of two-nucleon decays, asymptotic energy and angular correlations of protons and neutrons, Jacobi-Y correlations of two protons emitted from the broad low-energy structure, two-neutron decay of threshold resonance in 26O. The Gamow coupled-channel (GCC) method.

doi: 10.1088/1361-6471/ac888f
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2021CH19      Phys.Rev.Lett. 126, 132501 (2021)

R.J.Charity, T.B.Webb, J.M.Elson, D.E.M.Hoff, C.D.Pruitt, L.G.Sobotka, K.W.Brown, G.Cerizza, J.Estee, W.G.Lynch, J.Manfredi, P.Morfouace, C.Santamaria, S.Sweany, C.Y.Tsang, M.B.Tsang, Y.Zhang, K.Zhu, S.A.Kuvin, D.McNeel, J.Smith, A.H.Wuosmaa, Z.Chajecki

Observation of the Exotic Isotope 13F Located Four Neutrons beyond the Proton Drip Line

NUCLEAR REACTIONS 9Be(13O, 13F), E=69.5 MeV/nucleon; measured reaction products, Ep, Ip. 13F, 12O, 11N, 10C, 9B, 8Be; deduced 13F resonance parameters, energy levels, J, π, level decays via initial proton emissions.

doi: 10.1103/PhysRevLett.126.132501
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2686. Data from this article have been entered in the XUNDL database. For more information, click here.


2021CH45      Phys.Rev. C 104, 024325 (2021)

R.J.Charity, T.B.Webb, J.M.Elson, D.E.M.Hoff, C.D.Pruitt, L.G.Sobotka, P.Navratil, G.Hupin, K.Kravvaris, S.Quaglioni, K.W.Brown, G.Cerizza, J.Estee, W.G.Lynch, J.Manfredi, P.Morfouace, C.Santamaria, S.Sweany, M.B.Tsang, T.Tsang, K.Zhu, S.A.Kuvin, D.McNeel, J.Smith, A.H.Wuosmaa, Z.Chajecki

Using spin alignment of inelastically excited nuclei in fast beams to assign spins: The spectroscopy of 13O as a test case

NUCLEAR REACTIONS 9Be(13O, 13O'), E=69.5 MeV/nucleon, [secondary 13O beam from 9Be(16O, X), E=150 MeV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured charged particles, angular distribution of protons in 1p- and 2p-decays of the excited states of 13O using High Resolution Array (HiRA) of 14 ΔE-E (Si-CsI(Tl)) telescopes; deduced invariant-mass distributions of the p+12N and 2p+11C events from the decay of 13O excited states. 13O; deduced levels, resonances, J, π, Γ, E(p), possibly rotational bands built on deformed cluster configurations predicted by antisymmetrized molecular dynamics (AMD) calculations. Comparison of p(θ) data with DWBA using FRESCO code, and level structure of 13O with ab initio no-core shell model with continuum (NCSMC), and with the structure of 13B mirror nucleus.

doi: 10.1103/PhysRevC.104.024325
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2021CH54      Phys.Rev. C 104, 054307 (2021)

R.J.Charity, T.B.Webb, L.G.Sobotka, K.W.Brown

Spectroscopy of 10N with the invariant-mass method

NUCLEAR REACTIONS 9Be(13O, 10N), E=65.4 MeV/nucleon; 9Be(9C, 10N), E=68 MeV/nucleon; measured charged particles, p(9C)-coin using the High Resolution Array (HiRA) of 14 ΔE-E (Si-CsI(Tl)) telescopes at NSCL-MSU facility; deduced invariant-mass distributions of the p+9C produced following knockout of one proton and two neutrons from 13O, and from one proton pickup from 9C, decay-energy distributions obtained from p+9C coincidences in the two experiments, with contamination from p+10C, p+11C and 2p+9C events. 10N; deduced level, resonance, L-value, J, π, Γ using R-matrix analysis. Comparison of resonance energy and width with theoretical models, and with predictions from complex scaling and Gamow shell model calculations.

doi: 10.1103/PhysRevC.104.054307
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2021JI15      Phys.Rev.Lett. 127, 262502 (2021)

Y.Jin, C.Y.Niu, K.W.Brown, Z.H.Li, H.Hua, A.K.Anthony, J.Barney, R.J.Charity, J.Crosby, D.Dell'Aquila, J.M.Elson, J.Estee, M.Ghazali, G.Jhang, J.G.Li, W.G.Lynch, N.Michel, L.G.Sobotka, S.Sweany, F.C.E.Teh, A.Thomas, C.Y.Tsang, M.B.Tsang, S.M.Wang, H.Y.Wu, C.X.Yuan, K.Zhu

First Observation of the Four-Proton Unbound Nucleus 18Mg

RADIOACTIVITY 18Mg(14O), (2p), (4p) [from 9Be(20Mg, X)18Mg, E=170 MeV/nucleon]; measured decay products, Ep, Ip, 18Mg, 16Ne; deduced decay energy spectra, level scheme, J, π, resonance parameters. Comparison with the Gamow shell model (GSM) calculations.

doi: 10.1103/PhysRevLett.127.262502
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2021RU09      Phys.Rev. C 104, 044314 (2021)

D.Rudolph, C.Andreoiu, M.A.Bentley, M.P.Carpenter, R.J.Charity, R.M.Clark, J.Ekman, C.Fahlander, P.Fallon, W.Reviol, D.G.Sarantites, D.Seweryniak

Experimental and shell-model study of excited states in 5526Fe29 and related notes on 5529Cu26

NUCLEAR REACTIONS 28Si(32S, n4p)55Fe, E=125 MeV; measured Eγ, Iγ, (particle)γ-, γγ-coin, γγ(θ)(DCO) using the Gammasphere array for γ detection, 4π Microball system for charged particle detection, and the Neutron Shell array for neutron detection at ANL-ATLAS and LBNL cyclotron facilities. 55Fe; deduced high-spin levels, J, π, multipolarities, dipole structure, configurations. Comparison with shell-model calculations.

NUCLEAR STRUCTURE 55Fe, 55Cu; calculated high-spin levels, J, π, level half-lives, B(E2), B(M1), γ-branching ratios, configurations, occupation numbers relative to 56Ni. Shell-model calculations with KB3G and GXPF1A interactions, with isospin breaking terms, using ANTOINE code. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.044314
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2020AT01      Phys.Rev. C 101, 044303 (2020)

M.C.Atkinson, M.H.Mahzoon, M.A.Keim, B.A.Bordelon, C.D.Pruitt, R.J.Charity, W.H.Dickhoff

Dispersive optical model analysis of 208Pb generating a neutron-skin prediction beyond the mean field

NUCLEAR REACTIONS 208Pb(p, X), (n, X), (p, p), (n, n), E=10-200 MeV; 208Pb(e, e), E=502 MeV; calculated reaction σ(E), differential σ(E, θ), analyzing powers Ay(θ) using dispersive optical model (DOM). Comparison with experimental data.

NUCLEAR STRUCTURE 208Pb; calculated neutron and proton single-particle energy levels, charge density, orbital occupation and depletion numbers, spectroscopic factors, binding energies, momentum distributions of protons and neutrons. 40,48Ca, 208Pb; calculated proton and neutron point distributions, and neutron skins. Hartree-Fock and dispersive optical model (DOM) calculations. Comparison with experimental data. Relevance to nuclear equation of state.

doi: 10.1103/PhysRevC.101.044303
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2020CH41      Phys.Rev. C 102, 044614 (2020)

R.J.Charity, L.G.Sobotka, J.A.Tostevin

Single-nucleon knockout cross sections for reactions producing resonance states at or beyond the drip line

NUCLEAR REACTIONS 9Be(9C, 8B)p, (9C, 8C)n, E≈66.8 MeV/nucleon; 9Be(13O, 12N)p, (13O, 12O)n, E=65.4 MeV/nucleon; 9Be(17Ne, 16Ne)n, E=58.2 MeV/nucleon; analyzed experiments performed at NSCL-MSU using HiRA array of 14 Si-CsI(Tl) E-ΔE telescopes, and reported in 2010Ch42, 2011Ch32 and 2014Br15 publications for 9C beam, in 2019We11 for 13O beam, and in 2014Br19, 2018Ch25 and 2019Ch16 for 17Ne beam; deduced single-nucleon knockout cross sections and spectroscopic factors with emphasis on the production of resonance states in the residual nuclei, identified by their invariant mass, and resonances with two-, three-, and five-body exit channels. Comparison with eikonal-model predictions using spectroscopic factors from shell-model or variational Monte Carlo method. 9Be(13O, 12O)n, E=28.2 MeV/nucleon; analyzed experimental data from Texas A and M University Cyclotron facility, and reported in 2012Ja11 publication, for dependence of knockout cross sections on incident beam energy. 8B, 12N, 16Ne; deduced levels, resonances, J, π, isospin, widths, decay modes of resonances.

doi: 10.1103/PhysRevC.102.044614
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2020GA23      Phys.Lett. B 808, 135637 (2020)

A.Gade, D.Weisshaar, B.A.Brown, J.A.Tostevin, D.Bazin, K.Brown, R.J.Charity, P.J.Farris, A.M.Hill, J.Li, B.Longfellow, W.Reviol, D.Rhodes

In-beam γ-ray spectroscopy at the proton dripline: 40Sc

NUCLEAR REACTIONS 9Be(38Ca, X)40Sc, E=60.9 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π. Comparison with available data.

doi: 10.1016/j.physletb.2020.135637
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2585. Data from this article have been entered in the XUNDL database. For more information, click here.


2020PR09      Phys.Rev.Lett. 125, 102501 (2020)

C.D.Pruitt, R.J.Charity, L.G.Sobotka, M.C.Atkinson, W.H.Dickhoff

Systematic Matter and Binding-Energy Distributions from a Dispersive Optical Model Analysis

NUCLEAR STRUCTURE 16,18O, 40,48Ca, 58,64Ni, 112,124Sn, 208Pb; analyzed available bound-state anscattering data; deduced neutronn skins, the interplay of asymmetry, Coulomb, and shell effects on the skin thickness.

doi: 10.1103/PhysRevLett.125.102501
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2020PR10      Phys.Rev. C 102, 034601 (2020)

C.D.Pruitt, R.J.Charity, L.G.Sobotka, J.M.Elson, D.E.M.Hoff, K.W.Brown, M.C.Atkinson, W.H.Dickhoff, H.Y.Lee, M.Devlin, N.Fotiades, S.Mosby

Isotopically resolved neutron total cross sections at intermediate energies

NUCLEAR REACTIONS 16,18O, 58,64Ni, 103Rh, 112,124Sn(n, X), E=3-450 MeV; measured E(n), I(n), σ(E) by time-of-flight using wave-form-digitizer technology and BC-400 fast plastic scintillators at the WNR facility of the Los Alamos Neutron Science Center; deduced spectroscopic factors for valence proton and neutron levels through a dispersive optical model (DOM) analyses of σ(θ) data. 16,18O, 58,64Ni, 103Rh, 112,124Sn(p, p), (polarized p, p), (n, n), E=10-200 MeV; analyzed experimental σ(E), σ(θ, E), Ay(θ, E) data in literature; deduced dispersive optical model (DOM) parameters, charge radii and binding energies. Comparison with previous experimental measurements of σ(E) using analog methods.

doi: 10.1103/PhysRevC.102.034601
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14661.


2020RU04      Phys.Rev. C 102, 014316 (2020)

D.Rudolph, I.Ragnarsson, C.Andreoiu, M.A.Bentley, M.P.Carpenter, R.J.Charity, R.M.Clark, J.Ekman, C.Fahlander, P.Fallon, W.Reviol, D.G.Sarantites, D.Seweryniak

Single-particle and collective excitations in the N=28 isotones 54Fe and 53Mn

NUCLEAR REACTIONS 28Si(32S, 3pα)53Mn, (32S, 2pα)54Fe, E=125 MeV; measured Eγ, Iγ, E(n), (particle)γ- and γγ-coin, γγ(θ)(DCO) using the Gammasphere array for γ detection, 4π Microball system for charged particle detection, and the Neutron Shell for neutron detection at ANL-ATLAS and LBNL facilities. 53Mn, 54Fe; deduced high-spin levels, J, π, multipolarities, band structures, alignments and configurations. Comparison with cranked Nilsson-Strutinsky calculations, and with large-scale shell model calculations in the fp shell with GXPF1A and KB3G interactions and isospin breaking terms.

doi: 10.1103/PhysRevC.102.014316
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2020WE08      Phys.Rev. C 101, 044317 (2020)

T.B.Webb, R.J.Charity, J.M.Elson, D.E.M.Hoff, C.D.Pruitt, L.G.Sobotka, K.W.Brown, J.Barney, G.Cerizza, J.Estee, W.G.Lynch, J.Manfredi, P.Morfouace, C.Santamaria, S.Sweany, M.B.Tsang, T.Tsang, Y.Zhang, K.Zhu, S.A.Kuvin, D.McNeel, J.Smith, A.H.Wuosmaa, Z.Chajecki

Invariant-mass spectrum of 11O

NUCLEAR REACTIONS 9Be(13O, 11O), E=69.5 MeV/nucleon; measured Ep, Ip, and invariant mass spectrum of 11O fragments from (9C)2p-coin events with two-proton emission from two states in 11O, longitudinal-momentum distributions using the HiRA array at NSCL-MSU facility. 11O; deduced levels, S(2p) for ground state.

doi: 10.1103/PhysRevC.101.044317
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2019CH16      Phys.Rev. C 99, 044304 (2019)

R.J.Charity, K.W.Brown, J.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.Winkelbauer, S.Bedoor, D.G.McNeel, A.H.Wuosmaa

Invariant-mass spectroscopy of 18Ne 16O, and 10C excited states formed in neutron-transfer reactions

NUCLEAR REACTIONS 9Be(17Ne, X), E=58.2 MeV/nucleon;9Be(15O, X), E=48.1 MeV/nucleon, [secondary 17Ne and 15O beams from 9Be(20Ne, X), E=170 MeV primary reaction]; 9Be(9C, X), E=64.6 MeV/nucleon, [secondary 9C beam from 9Be(16O, X), E=150 MeV primary reaction]; measured charged particle spectra, σ(θ), Eγ, Iγ, γ(θ), (particle)γ-coin, excitation-energy spectra with invariant-mass method, center-of-mass velocity distributions, invariant-mass spectroscopy for neutron transfer reactions using the HiRA ΔE-E telescope array for charged particle detection and the CAESAR array for γ detection at NSCL-MSU facility. 10C, 16O, 18Ne; deduced levels, J, π, widths, branching ratios of high-lying states, and IMM fits for A=18 Comparison with theoretical predictions, and with previous experimental results.

doi: 10.1103/PhysRevC.99.044304
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2019CH50      Phys.Rev. C 100, 064305 (2019)

R.J.Charity, K.W.Brown, J.Okolowicz, M.Ploszajczak, J.M.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Invariant-mass spectroscopy of 14O excited states

NUCLEAR REACTIONS 9Be(15O, 14O), E=52.1 MeV/nucleon, [secondary 15O beam from 9Be(20Ne, X)15O/17Ne, E=150 MeV/nucleon]; measured reaction products, Eγ, Iγ, (particle)γ-coin using HiRA array for particle detection and CAESAR array for γ rays at the NSCL-MSU facility. 14O; deduced levels, resonances, Jπ, Γ, cross sections and branching ratios for different one-proton and 2-proton emitting channels from excited states in 14O, configuration mixing in resonance spectra. 13N, 12C; deduced levels from 1-proton and 2-proton emissions from excited states in 14O. Comparison with shell model calculations embedded in the continuum (SMEC), treating bound and scattering states in a unified model.

doi: 10.1103/PhysRevC.100.064305
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2019WA16      Phys.Rev. C 99, 054302 (2019)

S.M.Wang, W.Nazarewicz, R.J.Charity, L.G.Sobotka

Structure and decay of the extremely proton-rich nuclei 11, 12O

NUCLEAR STRUCTURE 10,11N, 11,12O, 11Li, 12Be; calculated levels, J, π, 2p partial decay width of 12O. 11O, 11Li, 12Be, 12O; calculated levels, J, π, two-proton widths and configurations for mirror nuclei. 12C; calculated two-proton angular correlation. 6Be, 12O; calculated 2p density distributions. 11O, 11Li; calculated angular correlations between the valence nucleons in ground and excited states. 10N, 11O; calculated trajectories of the threshold resonances. Deformed core+nucleon+nucleon Gamow coupled channel (GCC) method. Comparison with experimental data.

RADIOACTIVITY 6Be, 11,12O(2p); calculated 2p density distributions, decay widths. Deformed core+nucleon+nucleon Gamow coupled channel (GCC) method.

doi: 10.1103/PhysRevC.99.054302
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2019WE03      Phys.Rev.Lett. 122, 122501 (2019)

T.B.Webb, S.M.Wang, K.W.Brown, R.J.Charity, J.M.Elson, J.Barney, G.Cerizza, Z.Chajecki, J.Estee, D.E.M.Hoff, S.A.Kuvin, W.G.Lynch, J.Manfredi, D.McNeel, P.Morfouace, W.Nazarewicz, C.D.Pruitt, C.Santamaria, J.Smith, L.G.Sobotka, S.Sweany, C.Y.Tsang, M.B.Tsang, A.H.Wuosmaa, Y.Zhang, K.Zhu

first Observation of Unbound 11O, the Mirror of the Halo Nucleus 11Li

RADIOACTIVITY 11,12O(2p) [from 9Be(13O, xn)11O/12O, E<69.5 MeV/nucleon]; measured decay products, Ep, Ip; deduced an invariant-mass spectrum, resonant state widths, two-nucleon density distributions. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.122.122501
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2019WE11      Phys.Rev. C 100, 024306 (2019); Erratum Phys.Rev. C 102, 019904 (2020)

T.B.Webb, R.J.Charity, J.M.Elson, D.E.M.Hoff, C.D.Pruitt, L.G.Sobotka, K.W.Brown, J.Barney, G.Cerizza, J.Estee, G.Jhang, W.G.Lynch, J.Manfredi, P.Morfouace, C.Santamaria, S.Sweany, M.B.Tsang, T.Tsang, S.M.Wang, Y.Zhang, K.Zhu, S.A.Kuvin, D.McNeel, J.Smith, A.H.Wuosmaa, Z.Chajecki

Particle decays of levels in 11, 12N and 12O investigated with the invariant-mass method

NUCLEAR REACTIONS 9Be(13O, 12O), (13O, 12N), (13O, 11N), E=69.5 MeV/nucleon, [secondary 13O beam from 9Be(16O, 12O), E=150 MeV/nucleon primary reaction, followed by separation of ion beam using A1900 magnetic separator]; measured charged particles, (particle)(particle)-coin, cross sections using the High Resolution Array (HiRA) of 14 ΔE-E Si-CsI(Tl) telescopes at NSCL, MSU facility. 12,13O, 12N; deduced levels, J, π, 2p-, 3p-, 1p- and 2p+α-decay branches, p+10C, p+11C, 2p+10C invariance mass spectra, widths, total decay energy spectrum and invariant-mass spectra from coincident 4p+2α events. Comparison with Gamow coupled-channel (GCC) calculations, and with previous experimental data in the ENSDF database.

doi: 10.1103/PhysRevC.100.024306
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2018AT02      Phys.Rev. C 98, 044627 (2018)

M.C.Atkinson, H.P.Blok, L.Lapikas, R.J.Charity, W.H.Dickhoff

Validity of the distorted-wave impulse-approximation description of 40Ca(e, e'p)39K data using only ingredients from a nonlocal dispersive optical model

NUCLEAR REACTIONS 40Ca(e, e'p)39K, E=299-532 MeV; measured Ep, Ip, electron spectra, spectral strengths as function of excitation energy, and spectral functions in parallel kinematics using high-resolution magnetic spectrometers for charged particle detection at the Medium Energy Accelerator at Nikhef, Amsterdam. Comparison with calculations using dispersive optical model (DOM) for distorted wave impulse-approximation (DWIA). 39K; deduced levels, J, π, spectroscopic factors. 40Ca(p, p), (n, n), E=10-100 MeV; analyzed σ(θ, E) and analyzing powers Ay(θ, E) by nonlocal DOM description. 40Ca(p, X), E<200 MeV; analyzed σ(E) by nonlocal DOM description. 40Ca; analyzed charge density using the DOM propagator, and compared with experimental data.

doi: 10.1103/PhysRevC.98.044627
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2018CH25      Phys.Rev. C 97, 054318 (2018)

R.J.Charity, K.W.Brown, J.Okolowicz, M.Ploszajczak, J.M.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Spin alignment following inelastic scattering of 17Ne, lifetime of 16F, and its constraint on the continuum coupling strength

NUCLEAR REACTIONS 9Be(17Ne, 17Ne'), E=62.9 MeV/nucleon [17Ne secondary beam from 150 MeV/nucleon 16O primary beam]; measured reaction products, Ep and Ip(θ) of first and second protons in sequential two-proton decay of the second excited state of Jπ=5/2- in 17Ne using the High Resolution Array (HiRA) at NSCL-MSU. 17Ne; deduced excitation-energy spectra reconstructed from 2p+15O events from excited state of 17Ne, magnetic substate probability distribution, distribution of the relative emission angle between the sequential protons, and spin alignment of 17Ne excited state. 16F; deduced invariant mass spectra, widths of the first 0-, 1-, 2-, and 3- resonances, and compared with calculations using shell model embedded in the continuum (SMEC).

RADIOACTIVITY 16F(p)[from proton decay of excited state in 17Ne]; deduced width of the ground state from magnitude of the final-state interactions between the protons emitted by the excited state of 17Ne. Comparison with previous direct measurement of the width of the ground state.

doi: 10.1103/PhysRevC.97.054318
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2018HO06      Phys.Rev. C 97, 054605 (2018)

D.E.M.Hoff, G.Potel, K.W.Brown, R.J.Charity, C.D.Pruitt, L.G.Sobotka, T.B.Webb, B.Roeder, A.Saastamoinen

Large longitudinal spin alignment generated in inelastic nuclear reactions

NUCLEAR REACTIONS 9Be, 12C, 27Al(7Li, 7Li'), E=24.0 MeV/nucleon; measured breakup fragments of 7Li, excitation energy distributions, and efficiency-corrected angular correlations, differential σ(θ) at Texas A and M K-500 Cyclotron facility; deduced magnetic substate distribution, and presence of large longitudinal spin alignment in inelastically excited 7Li. Comparison with α+t DWBA cluster-model calculations.

doi: 10.1103/PhysRevC.97.054605
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2018OK02      Phys.Rev. C 97, 044303 (2018)

J.Okolowicz, M.Ploszajczak, R.J.Charity, L.G.Sobotka

Collectivization of anti-analog strength above charged particle thresholds

NUCLEAR REACTIONS 1H, C(12Be, 9Li), (12Be, 10Be), E=50 MeV/nucleon, [12Be secondary beam from 9Be(18O, X), E=120 MeV/nucleon]; measured charged particle spectra, (particle)(particle)-coin, angular correlations using HiRA array at NSCL-MSU facility. 9Li, 10Be; deduced levels, resonances, J, π, widths, strongly mixed excited states of lower isospin (T<) mediated by open neutron channels. Comparison with calculations using shell model embedded in the continuum (SMEC). Full details of the experiment available in 2008Ch28 paper.

doi: 10.1103/PhysRevC.97.044303
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2017BR07      Phys.Rev. C 95, 044326 (2017)

K.W.Brown, R.J.Charity, J.M.Elson, W.Reviol, L.G.Sobotka, W.W.Buhro, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Proton-decaying states in light nuclei and the first observation of 17Na

NUCLEAR REACTIONS 9Be(17Ne, 17Na), (17Ne, 17Ne), (17Ne, 16F), E=58 MeV/nucleon, [secondary 17Ne beam from 9Be(20Ne, X), E=170 MeV/nucleon primary reaction at NSCL-MSU accelerator facility]; 9Be(9C, 9C), (9C, 9B), (9C, 8B), E=68 MeV/nucleon, [secondary 9C beam from 9Be(16O, X), E=150 MeV/nucleon primary reaction]; measured charged-particle reaction products using HiRA array of 14 ΔE-E telescopes, and γ rays by CAESAR array of 158 CsI(Na), (particle)γ-coin; analyzed invariant mass spectra, R-matrix fits. 17Na, 17Ne, 16F, 9C, 8,9B; deduced levels, upper limit of mass for 17Na, proton unbound levels, widths, J, π, three-proton decay of 17Na, one- and two-proton decay branches of other nuclei. First identification of unbound 17Na nucleus.

doi: 10.1103/PhysRevC.95.044326
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2017DI03      J.Phys.(London) G44, 033001 (2017)

W.H.Dickhoff, R.J.Charity, M.H.Mahzoon

Novel applications of the dispersive optical model

doi: 10.1088/1361-6471/44/3/033001
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2017HO26      Phys.Rev.Lett. 119, 232501 (2017)

D.E.M.Hoff, R.J.Charity, K.W.Brown, C.D.Pruitt, L.G.Sobotka, T.B.Webb, G.Potel, B.Roeder, A.Saastamoinen

Large Longitudinal Spin Alignment of Excited Projectiles in Intermediate Energy Inelastic Scattering

NUCLEAR REACTIONS 9Be, C, 27Al(7Li, X), E=24 MeV/nucleon; measured projectile sequential breakup products. 7Li; deduced for peripheral events that do not excite the target large spin alignment of the excited projectiles longitudinal to the beam axis.

doi: 10.1103/PhysRevLett.119.232501
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2017MA76      Phys.Rev.Lett. 119, 222503 (2017)

M.H.Mahzoon, M.C.Atkinson, R.J.Charity, W.H.Dickhoff

Neutron Skin Thickness of 48Ca from a Nonlocal Dispersive Optical-Model Analysis

NUCLEAR REACTIONS 48Ca(n, n), E not given; analyzed available data; deduced σ, σ(θ), neutron and proton numbers, and the charge distributions.

doi: 10.1103/PhysRevLett.119.222503
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2017WU03      Phys.Rev. C 95, 014310 (2017)

A.H.Wuosmaa, S.Bedoor, K.W.Brown, W.W.Buhro, Z.Chajecki, R.J.Charity, W.G.Lynch, J.Manfredi, S.T.Marley, D.G.McNeel, A.S.Newton, D.V.Shetty, R.H.Showalter, L.G.Sobotka, M.B.Tsang, J.R.Winkelbauer, R.B.Wiringa

Ground-state properties of 5H from the 6He (d, 3He) 5H reaction

NUCLEAR REACTIONS 2H(6He, 3He), (6He, t), E=55 MeV/nucleon, [secondary 6He beam from 9Be(18O, X), E=120 MeV/nucleon and using A1900 fragment separator at NSCL-MSU facility]; measured particle identification (PID) spectra, kinetic-energy spectra of low-energy 3He and 3H particles using High Resolution Array (HiRA) of charged-particle-detector telescopes and CsI(Tl) scintillator crystals; deduced correlations between E(3He) and E(3H), and E(3H) and E(4He), Q-value dependence of cross sections from DWBA calculations, 3H recoil-energy distributions from the decay of 5H, beam-like recoils and two-neutron correlations. 5H, 5He; deduced energies and widths of resonances corresponding to the ground state. Comparison with previous experimental results, shell-model and ab initio nuclear-structure calculations.

COMPILATION 5H; compiled theoretical and previous (1968-2005) experiments for identification, and results of resonance energy and width of ground-state resonance of 5H.

doi: 10.1103/PhysRevC.95.014310
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2016BO13      Few-Body Systems 57, 331 (2016)

A.Bonaccorso, F.Carstoiu, R.J.Charity, R.Kumar, G.Salvioni

Differences Between a Single- and a Double-Folding Nucleus-9Be Optical Potential

NUCLEAR REACTIONS 9Be(8B, X), (8Li, X), (8C, X), E=100 MeV; analyzed available data; deduced neutron-, and nucleus-9Be imaginary potentials, energy dependent strong absorption radii and total reaction σ. Comparison with experimental values.

doi: 10.1007/s00601-016-1082-4
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2016BO21      Phys.Rev. C 94, 034604 (2016)

A.Bonaccorso, F.Carstoiu, R.J.Charity

Imaginary part of the 9C-9Be single-folded optical potential

NUCLEAR REACTIONS 9Be(9C, X), E=20, 38, 65, 83 MeV/nucleon; calculated nucleus-nucleus imaginary potentials for scattering of exotic light nuclei, the corresponding S matrices and total reaction σ(E) using a single-folding model where nucleus - 9Be target potential taken from a phenomenological fit to data over a large range of energies, and projectile densities from a series of microscopic calculations.

doi: 10.1103/PhysRevC.94.034604
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2015BR11      Phys.Rev. C 92, 034329 (2015)

K.W.Brown, R.J.Charity, L.G.Sobotka, L.V.Grigorenko, T.A.Golubkova, S.Bedoor, W.W.Buhro, Z.Chajecki, J.M.Elson, W.G.Lynch, J.Manfredi, D.G.McNeel, W.Reviol, R.Shane, R.H.Showalter, M.B.Tsang, J.R.Winkelbauer, A.H.Wuosmaa

Interplay between sequential and prompt two-proton decay from the first excited state of 16Ne

NUCLEAR REACTIONS 9Be(17Ne, 16Ne), E=57.6 MeV/nucleon; analyzed results of experimental measurements reported in their 2014Br19 work carried out at NSCL-MSU. 16Ne; analyzed relative energy spectra and few-body correlations of 14O+2p and 13N+3p events; deduced level energies and widths of g.s. and first 2+ state from kinematic analysis of 14O+p+p events, and those of higher levels from analysis of the 13N+p+p+p events. Sequential and diprotonlike decays deduced from correlation pattern reproduced in three-body 14O+p+p calculations. 15F, 14O, 13N; deduced levels, J, π from particle decays of states in 16Ne.

doi: 10.1103/PhysRevC.92.034329
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2015CH12      Phys.Rev. C 91, 024610 (2015)

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

Spin alignment of excited projectiles due to target spin-flip interactions

NUCLEAR REACTIONS 9Be(6Li, X), E=36.6 MeV/nucleon; 9Be(7Be, X), E=65.2 MeV/nucleon, [6Li, 7Be secondary beams from 9Be(16O, X), E=150 MeV/nucleon primary reaction]; measured particle spectra, angular distributions of reaction products using HiRA array of ΔE-E telescopes at NSCL-MSU facility; deduced sequential breakup of projectiles, spin alignments, and molecular structure of 9Be.

doi: 10.1103/PhysRevC.91.024610
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2015RO17      Phys.Rev. C 92, 044607 (2015)

A.Ross, L.J.Titus, F.M.Nunes, M.H.Mahzoon, W.H.Dickhoff, R.J.Charity

Effects of nonlocal potentials on (p, d) transfer reactions

NUCLEAR REACTIONS 40Ca(p, d)39Ca, E=20, 35, 50 MeV; 40Ca(p, p), E=50 MeV; calculated σ(θ) distributions using nonlocal potential obtained from non-local dispersive optical model (DOM) and DOM-phase equivalent (PE), combined with DWBA. Comparison with Perey-Buck (PB) optical potential predictions, and with experimental data.

doi: 10.1103/PhysRevC.92.044607
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2014BO02      Phys.Rev. C 89, 024619 (2014)

A.Bonaccorso, R.J.Charity

Optical potential for the n-9Be reaction

NUCLEAR REACTIONS 9Be(n, n), (n, X), E=0.1-200 MeV; analyzed elastic, and reaction σ(E), σ(E, θ), neutron knockout cross sections by two parameterization of the optical-model potential: phenomenological used in earlier studies, and dispersive optical model (DOM). Comparison of the two approaches with experimental data.

doi: 10.1103/PhysRevC.89.024619
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2014BR15      Phys.Rev. C 90, 027304 (2014)

K.W.Brown, W.W.Buhro, R.J.Charity, J.M.Elson, W.Reviol, L.G.Sobotka, Z.Chajecki, W.G.Lynch, J.Manfredi, R.Shane, R.H.Showalter, M.B.Tsang, D.Weisshaar, J.R.Winkelbauer, S.Bedoor, A.H.Wuosmaa

Two-proton decay from the isobaric analog state in 8B

NUCLEAR REACTIONS 9Be(9C, 8B), E=68 MeV/nucleon, [9C secondary beam from 9Be(16O, X), E=150 MeV/nucleon primary fragmentation reaction]; measured Ep, Ip, 6Li-p-p correlated events from IAS of 8C g.s. in 8B by analyzing complete kinematics of 2p+6Li decay products, gamma decay of IAS in 6Li; deduced isospin-allowed 2p decay between isobaric analog states, three-body energy and angular correlations, branching ratios. Experiments carried out at NSCL-MSU facility using A1900 fragment separator and High Resolution Array of Si-CsI(Tl) telescopes.

doi: 10.1103/PhysRevC.90.027304
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2014BR19      Phys.Rev.Lett. 113, 232501 (2014)

K.W.Brown, R.J.Charity, L.G.Sobotka, Z.Chajecki, L.V.Grigorenko, I.A.Egorova, Yu.L.Parfenova, M.V.Zhukov, S.Bedoor, W.W.Buhro, J.M.Elson, W.G.Lynch, J.Manfredi, D.G.McNeel, W.Reviol, R.Shane, R.H.Showalter, M.B.Tsang, J.R.Winkelbauer, A.H.Wuosmaa

Observation of Long-Range Three-Body Coulomb Effects in the Decay of 16Ne

RADIOACTIVITY 16Ne(2p) [from Be(17Ne, X), E=57.6 MeV/nucleon]; measured decay products, Ep, Ip; deduced resonance width limit, correlations between the momenta of the three decay products, dependence on the long-range nature of the Coulomb interaction. Comparison with theoretical calculations, available data.

doi: 10.1103/PhysRevLett.113.232501
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2014CA45      Phys.Rev. C 90, 064621 (2014)

D.Carbone, M.Bondi, A.Bonaccorso, C.Agodi, F.Cappuzzello, M.Cavallaro, R.J.Charity, A.Cunsolo, M.De Napoli, A.Foti

First application of the n- 9Be optical potential to the study of the 10Be continuum via the (18O, 17O) neutron-transfer reaction

NUCLEAR REACTIONS 9Be(18O, 17O)10Be, E=84 MeV; measured E(17O) spectrum, angular distribution using MAGNEX spectrometer at tandem Van de Graaff facility of INFN-LNS. 10Be; deduced levels, J, π, resonances in the continuum. Breakup calculations describing the n-9Be interaction by means of an optical potential. Semi-classical approximation for the relative ion motion. Comparison between the measured cross section and the calculated using two parameterization of the optical potential.

doi: 10.1103/PhysRevC.90.064621
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2014CH08      Eur.Phys.J. A 50, 23 (2014), Erratum Eur.Phys.J. A 50, 64 (2014)

R.J.Charity, W.H.Dickhoff, L.G.Sobotka, S.J.Waldecker

Isospin dependence of nucleon correlations in ground-state nuclei

NUCLEAR STRUCTURE 102,106,112,124,130,132Sn; calculated proton orbit strength function, spectroscopic factor. 154Sn; calculated proton hole spectroscopic factor. 132Sn, 208Pb; calculated neutron states above the core, spectroscopic factor. Dispersive optical model.

doi: 10.1140/epja/i2014-14023-0
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2014DU15      Phys.Rev. C 90, 061603 (2014)

H.Dussan, M.H.Mahzoon, R.J.Charity, W.H.Dickhoff, A.Polls

Elastic nucleon-nucleus scattering as a direct probe of correlations beyond the independent-particle model

NUCLEAR REACTIONS 40Ca(p, p), (n, n), E<200 MeV; analyzed scattering and structure data using the full nonlocal treatment of the dispersive optical model (DOM). Discussed application for inverse kinematics reactions.

doi: 10.1103/PhysRevC.90.061603
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2014MA18      Phys.Rev.Lett. 112, 162503 (2014)

M.H.Mahzoon, R.J.Charity, W.H.Dickhoff, H.Dussan, S.J.Waldecker

Forging the Link between Nuclear Reactions and Nuclear Structure

NUCLEAR REACTIONS 40Ca(n, n), (p, p), E<200 MeV; calculated σ, σ(θ), spectral strength. Comparison with experimental data.

doi: 10.1103/PhysRevLett.112.162503
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2014SA46      Phys.Lett. B 736, 137 (2014)

A.Sanetullaev, M.B.Tsang, W.G.Lynch, Jenny Lee, D.Bazin, K.P.Chan, D.Coupland, V.Henzl, D.Henzlova, M.Kilburn, A.M.Rogers, Z.Y.Sun, M.Youngs, R.J.Charity, L.G.Sobotka, M.Famiano, S.Hudan, D.Shapira, W.A.Peters, C.Barbieri, M.Hjorth-Jensen, M.Horoi, T.Otsuka, T.Suzuki, Y.Utsuno

Neutron spectroscopic factors of 55Ni hole-states from image transfer reactions

NUCLEAR REACTIONS 1H(56Ni, d), E=37 MeV/nucleon; measured reaction products; deduced spectroscopic factors, J, π, σ(θ). Comparison with shell model calculations.

doi: 10.1016/j.physletb.2014.07.003
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2013CI02      Acta Phys.Pol. B44, 611 (2013)

M.Ciemala, M.Kmiecik, M.Krzysiek, A.Maj, K.Mazurek, R.Charity, D.Mancusi

Gamma-decay of the GDR in the GEMINI++ Code

NUCLEAR REACTIONS 40Ca(48Ti, X)88Mo, E=300, 450, 600 MeV; calculated yields, experimental γ-spectra, GDR parameters. GEMINI++ with Monte Carlo code cascade.

doi: 10.5506/APhysPolB.44.611
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2013JI01      Phys.Rev.Lett. 110, 072701 (2013)

C.L.Jiang, B.B.Back, H.Esbensen, R.V.F.Janssens, K.E.Rehm, R.J.Charity

Origin and Consequences of 12C+12C Fusion Resonances at Deep Sub-barrier Energies

NUCLEAR REACTIONS 12C(12C, X)24Mg, 12C(13C, X)25Mg, 13C(13C, X)26Mg, 12C(16O, X)28Si, 16O(16O, X)32S, E(cm)<10 MeV; analyzed available fusion σ, S-factors; deduced resonance behavior of fusion reactions at low energies.

doi: 10.1103/PhysRevLett.110.072701
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2013LU10      Phys.Rev. C 88, 017604 (2013)

F.Lu, J.Lee, M.B.Tsang, D.Bazin, D.Coupland, V.Henzl, D.Henzlova, M.Kilburn, W.G.Lynch, A.M.Rogers, A.Sanetullaev, Z.Y.Sun, M.Youngs, R.J.Charity, L.G.Sobotka, M.Famiano, S.Hudan, M.Horoi, Y.L.Ye

Neutron-hole states in 45Ar from 1H(46Ar, d)45Ar reactions

NUCLEAR REACTIONS 1H(46Ar, d), E=33 MeV/nucleon; measured E(d), I(d), σ(θ). Radioactive secondary beam of 46Ar produced in the Coupled Cyclotron facility at NSCL. 45Ar; deduced levels, J, π, L-transfer, spectroscopic factors. ADWA analysis. Comparison with spectroscopic factors determined in 2H(44Ar, p)45Ar reaction, and with shell-model calculations.

doi: 10.1103/PhysRevC.88.017604
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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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2012CH40      Phys.Rev. C 86, 041307 (2012)

R.J.Charity, L.G.Sobotka, K.Hagino, D.Bazin, M.A.Famiano, A.Gade, S.Hudan, S.A.Komarov, Jenny Lee, S.P.Lobastov, S.M.Lukyanov, W.G.Lynch, C.Metelko, M.Mocko, A.M.Rogers, H.Sagawa, A.Sanetullaev, M.B.Tsang, M.S.Wallace, M.J.van Goethem, A.H.Wuosmaa

Double isobaric analog of 11Li in 11B

NUCLEAR REACTIONS 1H(12Be, 11B), E=50 MeV/nucleon; analyzed decay products, excitation energy via 2p+9Li events, mass excess. 11B; deduced level, J, π, width, double isobaric analog state of the two-neutron-halo system 11Lig.s.. Discussed T=5/2 isospin sextet using the isobaric multiplet mass equation.

doi: 10.1103/PhysRevC.86.041307
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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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2012GR21      Phys.Rev. C 86, 061602 (2012)

L.V.Grigorenko, I.A.Egorova, R.J.Charity, M.V.Zhukov

Sensitivity of three-body decays to the reactions mechanism and the initial structure by example of 6Be

NUCLEAR STRUCTURE 6Be; calculated excitation spectra of 0+ and 2+ states as function of the spin composition of the source function, dependence of the 6Be excitation spectra on the radius parameter r0 of the 7Be; analyzed neutron-knockout reactions on 7Be reaction mechanism, effects of initial-state structure, three-body decay. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.061602
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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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2012LI37      Phys.Rev. C 86, 024605 (2012)

T.X.Liu, W.G.Lynch, R.H.Showalter, M.B.Tsang, X.D.Liu, W.P.Tan, M.J.van Goethem, G.Verde, A.Wagner, H.F.Xi, H.S.Xu, M.A.Famiano, R.T.de Souza, V.E.Viola, R.J.Charity, L.G.Sobotka

Isospin observables from fragment energy spectra

NUCLEAR REACTIONS 112,124Sn(112Sn, X), (124Sn, X)1H/2H/3H/3He/4He/6He/6Li/7Li/8Li/9Li/7Be/9Be/10Be/11Be/10B/11B/12B/13B/11C/12C/13C/14C/15C/16C/14N/15N/16N/17N/18N/15O/16O/17O/18O/19O/20O, E=50 MeV/nucleon; measured energy spectra of light charged particles and intermediate mass fragments, fragment yields, σ(E) using LASSA, Miniball and Miniwall arrays at NSCL facility; deduced N/Z ratios.

doi: 10.1103/PhysRevC.86.024605
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2012MA10      Phys.Rev. C 85, 037603 (2012)

J.Manfredi, R.J.Charity, K.Mercurio, R.Shane, L.G.Sobotka, A.H.Wuosmaa, A.Banu, L.Trache, R.E.Tribble

α decay of the excited states in 12C at 7.65 and 9.64 MeV

NUCLEAR REACTIONS Be, C(10C, X)12C*, [secondary 10C beam from 10B(p, n)], E=107 MeV/nucleon; measured triple α events in coincidence mode, distribution of the root-mean-square energy deviation of the three α particles and E*(8Be); deduced α-decay properties of Hoyle state and 3- excited state through 8Be ground state. R-matrix analysis.

doi: 10.1103/PhysRevC.85.037603
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2012SH21      Phys.Rev. C 85, 064612 (2012)

R.Shane, R.J.Charity, L.G.Sobotka, D.Bazin, B.A.Brown, A.Gade, G.F.Grinyer, S.McDaniel, A.Ratkiewicz, D.Weisshaar, A.Bonaccorso, J.A.Tostevin

Proton and neutron knockout from 36Ca

NUCLEAR REACTIONS 9Be(36Ca, 35K), (36Ca, 35Ca), [36Ca secondary beam from 9Be(40Ca, X), E=140 MeV/nucleon primary reaction], E=70 MeV/nucleon; measured Eγ, particle spectra, time-of-flight, energy loss, cross sections, longitudinal-momentum distributions. 35K, 35Ca; deduced spectroscopic factors, orbital angular momenta of removed nucleons; calculated S matrices, bound-state wave-functions. Eikonal reaction theory, dispersive optical model (DOM) extrapolations. Shell-model spectroscopic factors from USD, USDA, and USDB interactions. 9Be(36Ca, X)33Ar, [33Ar from decay of unbound states in 35Ca], E=70 MeV/nucleon; measured σ; deduced missing spectroscopic strength.

doi: 10.1103/PhysRevC.85.064612
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2012SH30      Prog.Theor.Phys.(Kyoto), Suppl. 196, 352 (2012)

R.Shane, R.Charity, L.Sobotka

Exploring Correlations in Exotic Nuclei

NUCLEAR REACTIONS 40,48Ca(n, X), Be(40Ca, X)36Ca, E<300 MeV; analyzed available data; deduced total σ sensitivity to n/p asymmetry dependence of the surface imaginary potential in a dispersive optical model. Comparison with available data.

doi: 10.1143/PTPS.196.352
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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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2011LE01      Phys.Rev. C 83, 014606 (2011)

J.Lee, M.B.Tsang, D.Bazin, D.Coupland, V.Henzl, D.Henzlova, M.Kilburn, W.G.Lynch, A.M.Rogers, A.Sanetullaev, Z.Y.Sun, M.Youngs, R.J.Charity, L.G.Sobotka, M.Famiano, S.Hudan, D.Shapira, P.O'Malley, W.A.Peters, K.Y.Chae, K.Schmitt

Neutron spectroscopic factors of 34Ar and 46Ar from (p, d) transfer reactions

NUCLEAR REACTIONS 1H(34Ar, d), (36Ar, d), (46Ar, d), E=33 MeV/nucleon, [34,46Ar secondary beams from 9Be(36Ar, X), E=150 MeV/nucleon and 9Be(48Ca, X), E=140 MeV/nucleon primary reactions]; measured Ed, Id, σ(θ); 34,36,46Ar; deduced neutron ground-state spectroscopic factors. Comparison with shell model calculations.

doi: 10.1103/PhysRevC.83.014606
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2011MA60      J.Korean Phys.Soc. 59, 943s (2011)

D.Mancusi, J.Cugnon, A.Boudard, J.-C.David, S.Leray, R.J.Charity, A.Kelic-heil, M.V.Ricciardi

Multifragmentation in Reactions of 1-GeV Protons with Iron Nuclei

NUCLEAR REACTIONS 56Fe(p, X), E=1 GeV; calculated multifragmentation IMF residue yields, σ, charge distributions, 7Li, 10B longitudinal velocity distributions, neutron multiplicity, α multiplicity. GEMINI++, SPALADIN, ABLA07 codes with and without multifragmentation. Comparison to data.

doi: 10.3938/jkps.59.943
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2011MU10      Phys.Rev. C 83, 064605 (2011)

J.M.Mueller, R.J.Charity, R.Shane, L.G.Sobotka, S.J.Waldecker, W.H.Dickhoff, A.S.Crowell, J.H.Esterline, B.Fallin, C.R.Howell, C.Westerfeldt, M.Youngs, B.J.Crowe, III, R.S.Pedroni

Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis

NUCLEAR REACTIONS 40,48Ca(n, n), E=11.9, 16.9 MeV; measured E(n), I(n), σ, σ(E, θ), time-of-flight spectra. 40Ca(n, n), E=9.9-85.0; 48Ca(n, n), E=7.97-16.9 MeV; 54Ca(n, n), E=5.5-26.0 MeV; 58,60Ni(n, n), E=4.5-24.0 MeV; 92Mo(n, n), E=7.0-30.4 MeV; 116,118Sn(n, n), E=9.95-24.0 MeV; 120Sn(n, n), E=9.94-16.91 MeV; 124Sn(n, n), E=11.0-24.0 MeV; 208Pb(n, n), E=4.0-185.0 MeV; 50Ti(p, p), E=6.0-65.0 MeV; 52Cr(p, p), E=10.77-39.9 MeV; 54Fe, 64Ni(p, p), E=9.69-65.0 MeV; 58Ni(p, p), E=7.0-192.0 MeV; 60Ni(p, p), E=7.0-178.0 MeV; 62Ni(p, p), E=8.02-156.0 MeV; 90Zr(p, p), E=5.57-185.0 MeV; 92Mo(p, p), E=12.5-49.45 MeV; 114Sn(p, p), E=30.4 MeV; 116Sn(p, p), E=16.0-61.4 MeV; 118,122,124Sn(p, p), E=16.0-49.35 MeV; 120Sn(p, p), E=9.8-156.0 MeV; 208Pb(p, p), E=9.0-200.0 MeV; analyzed total cross sections, σ(E, θ), single-particle levels, spectroscopic factors, occupation probabilities, mass dependence on cross section. Dispersal optical model (DOM) analysis.

doi: 10.1103/PhysRevC.83.064605
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2011NG04      Phys.Rev. C 84, 044611 (2011)

N.B.Nguyen, S.J.Waldecker, F.M.Nunes, R.J.Charity, W.H.Dickhoff

Transfer reactions and the dispersive optical model

NUCLEAR REACTIONS 40Ca(d, p), E=20, 56 MeV; 48Ca(d, p), E=2, 13, 19.3, 56 MeV; 132Sn(d, p), E=9.46 MeV; 208Pb(d, p), E=8, 20 MeV; analyzed optical potentials, σ(θ, E), spectroscopic factors. Test of dispersive optical potentials. Comparison with experimental data and with predictions of a standard global optical potential. Finite-range adiabatic (FR-ADWA) calculations in the range of closed-shell nuclei.

doi: 10.1103/PhysRevC.84.044611
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2011RO18      Phys.Rev.Lett. 106, 252503 (2011)

A.M.Rogers, M.A.Famiano, W.G.Lynch, M.S.Wallace, F.Amorini, D.Bazin, R.J.Charity, F.Delaunay, R.T.de Souza, J.Elson, A.Gade, D.Galaviz, M.-J.van Goethem, S.Hudan, J.Lee, S.Lobastov, S.Lukyanov, M.Matos, M.Mocko, H.Schatz, D.Shapira, L.G.Sobotka, M.B.Tsang, G.Verde

Ground-State Proton Decay of 69Br and Implications for the 68Se Astrophysical Rapid Proton-Capture Process Waiting Point

RADIOACTIVITY 69Br(p) [from Be(78Kr, X), E=140 MeV/nucleon]; measured reaction products, proton spectrum. 69Br, 68Se; deduced proton separation energy. Astrophysical implications, comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.106.252503
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2011RO55      J.Phys.:Conf.Ser. 312, 042020 (2011)

A.M.Rogers, W.G.Lynch, M.A.Famiano, M.S.Wallace, F.Amorini, D.Bazin, R.J.Charity, F.Delaunay, R.T.de Souza, J.Elson, A.Gade, D.Galaviz, S.Hudan, J.Lee, S.Lobostov, S.Lukyanov, M.Matos, M.Mocko, M.B.Tsang, D.Shapira, L.G.Sobotka, G.Verde

Ground-state proton decay of 69Br and implications for the rp-process 68Se waiting-point

RADIOACTIVITY 69Br(p); measured in-flight Ep, Ip(θ), E(Se), I(Se), (Se)p-coin using HiRA telescopes; deduced p-spectra, proton separation energy, implications for 2p capture of rp process.

doi: 10.1088/1742-6596/312/4/042020
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2010BA36      Nucl.Phys. A834, 788c (2010)

C.Barbieri, R.J.Charity, W.H.Dickhoff, L.G.Sobotka

Toward a Global Dispersive Optical Model for the Driplines

NUCLEAR REACTIONS 40Ca(n, n), E=9-185 MeV; 40Ca(p, p), E=17.6-200 MeV; 42,44Ca(p, p), E=21-65 MeV; 48Ca(p, p), E=8-200 MeV; calculated σ(θ), analyzing power. 40,48Ca calculated levels, J, widths, radii, spectroscopic factors; deduced dispersive optical model parameters. 58,60,62,64Ni(p, p), E not given; calculated σ(θ). Comparison with data.

doi: 10.1016/j.nuclphysa.2010.01.147
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2010CH26      Phys.Rev. C 82, 014610 (2010)

R.J.Charity

Systematic description of evaporation spectra for light and heavy compound nuclei

NUCLEAR REACTIONS 27Al(32S, X)59Cu, E=100-214 MeV; 27Al(40Ar, X)67Ga, E=187, 280 MeV; 12C(55Mn, X)67Ga, E=670 MeV; 64Ni(32S, X)96Ru, E=180 MeV; 74Ge(32S, X)106Cd, E=99-160 MeV; 77Se(40Ar, X)117Te, E=146 MeV; 103Rh(14N, X)117Te, E=81, 121 MeV; 96Zr(60Ni, X)156Er, E=333 MeV; 144Sm(12C, X)156Er, E=142 MeV; 121Sb(35Cl, X)156Er, E=218 MeV; 100Mo(60Ni, X)160Yb, E=300-546 MeV; 165Ho(28Si, X)193Tl, E=145-216 MeV; 181Ta(19F, X)200Pb, E=121-195 MeV; 208Pb(16O, X)224Th, E=114, 138 MeV; analyzed center-of-mass kinetic-energy spectra of α particles and protons in coincidence with evaporation residues from compound nuclei, σ for evaporation residues as function of the excitation energy of the compound nuclei. Statistical model of compound-nucleus (CN) decay. Improved GEMINI++ computer code for adequate description of the spectral shape of evaporation spectra over all of the periodic table.

doi: 10.1103/PhysRevC.82.014610
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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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2010DI12      Phys.Rev. C 82, 054306 (2010)

W.H.Dickhoff, D.Van Neck, S.J.Waldecker, R.J.Charity, L.G.Sobotka

Nonlocal extension of the dispersive optical model to describe data below the Fermi energy

NUCLEAR REACTIONS 40Ca(e, e'p), (p, 2p), E<150 MeV; calculated spectral functions, quasihole energies, spectroscopic factors, radii and charge density for proton orbits in 40Ca using dispersive-optical-model (DOM) analysis. Comparison with experimental data.

doi: 10.1103/PhysRevC.82.054306
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2010GA02      Phys.Rev. C 81, 014604 (2010)

W.Gawlikowicz, D.K.Agnihotri, S.A.Baldwin, W.U.Schroder, J.Toke, R.J.Charity, D.G.Sarantites, L.G.Sobotka, R.T.deSouza, T.Barczyk, K.Grotowski, S.Micek, R.Planeta, Z.Sosin

Correlations between reaction product yields as a tool for probing heavy-ion reaction scenarios

NUCLEAR REACTIONS 209Bi(136Xe, X), E=28, 40, 62 MeV/nucleon; analyzed reaction product yields for neutrons, light charged particles (LCP), projectile like (PLF) and intermediate-mass fragments (IMFs). Comparison with classical transport code CLAT, quantum molecular dynamics (QMD) code, sequential decay code GEMINI and statistical multifragmentation code SMM.

doi: 10.1103/PhysRevC.81.014604
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2010GR06      Phys.Rev. C 82, 014615 (2010)

L.V.Grigorenko, I.A.Egorova, M.V.Zhukov, R.J.Charity, K.Miernik

Two-proton radioactivity and three-body decay. V. Improved momentum distributions

RADIOACTIVITY 6Be, 19Mg, 54Fe(2p); calculated classical trajectories, energy distribution, momentum density distribution contour maps, angular distributions and inclusive energies for true three-body decays. Exactly solvable semianalytical models with simplified three-body Hamiltonians. Discussed effect of screening by atomic electrons. Comparison with experimental data.

doi: 10.1103/PhysRevC.82.014615
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2010LE03      Phys.Rev.Lett. 104, 112701 (2010)

J.Lee, M.B.Tsang, D.Bazin, D.Coupland, V.Henzl, D.Henzlova, M.Kilburn, W.G.Lynch, A.M.Rogers, A.Sanetullaev, A.Signoracci, Z.Y.Sun, M.Youngs, K.Y.Chae, R.J.Charity, H.K.Cheung, M.Famiano, S.Hudan, P.O'Malley, W.A.Peters, K.Schmitt, D.Shapira, L.G.Sobotka

Neutron-Proton Asymmetry Dependence of Spectroscopic Factors in Ar Isotopes

NUCLEAR REACTIONS 1H(34Ar, d), (36Ar, d), (46Ar, d), E=33 MeV/nucleon; measured Eδ, Iδ; 34,36,46Ar; deduced neutron ground state spectroscopic factors. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.104.112701
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2010MA58      Phys.Rev. C 82, 044610 (2010)

D.Mancusi, R.J.Charity, J.Cugnon

Unified description of fission in fusion and spallation reactions

NUCLEAR REACTIONS 90Zr(64Ni, X), 139La, 159W, 169Tm, 181Ta, 197Au(19F, X), 100Mo(60Ni, X), 150Sm(18O, X), 165Ho(28Si, X), 170Er, 186W(30Si, X), 184W(32S, X), 182W, 204Pb(12C, X), 208Pb(16O, X), E<10 MeV/nucleon; 208Pb(p, X), E=500, 1000 MeV; 181Ta(p, X), E=150-1200 MeV; 197Au, 238U(p, X), E=1 GeV; Au, Bi, U(p, X), E=2.5 GeV; calculated σ for fusion and evaporation residues as function of evaporation residue energy, residual mass distributions, fission probability using Monte-Carlo statistical models for fission in fusion and spallation reactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.82.044610
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2010RU01      J.Phys.(London) G37, 075105 (2010)

D.Rudolph, I.Ragnarsson, W.Reviol, C.Andreoiu, M.A.Bentley, M.P.Carpenter, R.J.Charity, R.M.Clark, M.Cromaz, J.Ekman, C.Fahlander, P.Fallon, E.Ideguchi, A.O.Macchiavelli, M.N.Mineva, D.G.Sarantites, D.Seweryniak, S.J.Williams

Rotational bands in the semi-magic nucleus 5728Ni29

NUCLEAR REACTIONS 28Si(32S, n2p)57Ni, E=130 MeV; measured Eγ, Iγ, γ-γ-coins.; deduced high-spin states, superdeformed rotational bands. Cranked Nilsson-Strutinsky calculations, GAMMASPHERE.

doi: 10.1088/0954-3899/37/7/075105
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2010RU10      Phys.Rev. C 82, 054309 (2010)

D.Rudolph, L.-L.Andersson, R.Bengtsson, J.Ekman, O.Erten, C.Fahlander, E.K.Johansson, I.Ragnarsson, C.Andreoiu, M.A.Bentley, M.P.Carpenter, R.J.Charity, R.M.Clark, P.Fallon, A.O.Macchiavelli, W.Reviol, D.G.Sarantites, D.Seweryniak, C.E.Svensson, S.J.Williams

Isospin and deformation studies in the odd-odd N=Z nucleus 54Co

NUCLEAR REACTIONS 28Si(32S, npα), E=130 MeV; measured Eγ, Iγ, γγ-, αγ-, nγ-, pγ-coin, γγ(θ) using Gammasphere and Microball arrays. 54Co; deduced levels, J, π, multipolarities, mixing ratios, configurations. Comparison with large-scale shell-model calculations in the fp shell.

doi: 10.1103/PhysRevC.82.054309
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2010SH03      Nucl.Instrum.Methods Phys.Res. A614, 468 (2010)

R.Shane, R.J.Charity, J.M.Elson, L.G.Sobotka, M.Devlin, N.Fotiades, J.M.O'Donnell

Total neutron cross-sections for rare isotopes using a digital-signal-processing technique: Case study 48Ca

NUCLEAR REACTIONS 40,48Ca(n, X), E=15-300 Mev; measured TOF, En, In; deduced σ.

doi: 10.1016/j.nima.2010.01.005
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2009AN01      Phys.Rev. C 79, 024312 (2009)

L.-L.Andersson, I.Ragnarsson, D.Rudolph, E.K.Johansson, D.A.Torres, C.Andreoiu, M.P.Carpenter, R.J.Charity, C.J.Chiara, J.Ekman, C.Fahlander, C.Hoel, O.L.Pechenaya, W.Reviol, R.du Rietz, D.G.Sarantites, D.Seweryniak, L.G.Sobotka, S.Zhu

Comprehensive γ-ray spectroscopy of rotational bands in the N = Z + 1nucleus 61Zn

NUCLEAR REACTIONS 36Ar(28Si, n2p), E=142, 148 MeV; measured Eγ, Iγ, γγ-coin, neutron and particle spectra. 61Zn; deduced levels, J, π, multipolarity, bands. Comparison with Cranked Nilsson-Strutinsky calculations.

doi: 10.1103/PhysRevC.79.024312
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2009BA27      Phys.Rev.Lett. 102, 232501 (2009)

D.Bazin, R.J.Charity, R.T.de Souza, M.A.Famiano, A.Gade, V.Henzl, D.Henzlova, S.Hudan, J.Lee, S.Lukyanov, W.G.Lynch, S.McDaniel, M.Mocko, A.Obertelli, A.M.Rogers, L.G.Sobotka, J.R.Terry, J.A.Tostevin, M.B.Tsang, M.S.Wallace

Mechanisms in Knockout Reactions

doi: 10.1103/PhysRevLett.102.232501
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2009CH38      Phys.Rev. C 80, 024306 (2009)

R.J.Charity, T.D.Wiser, K.Mercurio, R.Shane, L.G.Sobotka, A.H.Wuosmaa, A.Banu, L.Trache, R.E.Tribble

Continuum spectroscopy with a 10C beam: Cluster structure and three-body decay

NUCLEAR REACTIONS Be, C(10C, X), E=10.7 MeV/nucleon; measured fragment spectra, σ(θ), proton-proton angular correlations, widths, σ, energy distributions of diproton, sequential two-proton, 2p+2α, p+3α and other cluster particle-decay modes from ground and excited resonant states. 10B, 10C, 13N; deduced levels, J, π, resonances, particle decay modes. Resonance-decay spectroscopic techniques. Monte Carlo analysis of energy distributions. Comparison with two-proton decay modes from 6Be and 45Fe.

doi: 10.1103/PhysRevC.80.024306
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2009GE14      Phys.Rev. C 80, 051304 (2009)

J.Gellanki, I.Ragnarsson, D.Rudolph, C.E.Svensson, L.-L.Andersson, C.Andreoiu, C.Baktash, M.P.Carpenter, R.J.Charity, C.J.Chiara, J.Eberth, J.Ekman, C.Fahlander, D.S.Haslip, E.K.Johansson, D.R.LaFosse, S.D.Paul, O.L.Pechenaya, W.Reviol, R.du Rietz, D.G.Sarantites, D.Seweryniak, L.G.Sobotka, H.G.Thomas, D.A.Torres, J.C.Waddington, J.N.Wilson, C.H.Yu, S.Zhu

Characterization of superdeformed bands in 62Zn

NUCLEAR REACTIONS 28Si(36Ar, 2p), E=140 MeV; 40Ca(28Si, 2pα), E=122 MeV; measured Eγ, Iγ, γγ-coin, DCO using Gammasphere array. 62Zn; deduced levels, J, π, moment of inertia, configurations. Comparison with cranked Nilsson-Strutinsky calculations.

doi: 10.1103/PhysRevC.80.051304
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2009GR07      Phys.Lett. B 677, 30 (2009)

L.V.Grigorenko, T.D.Wiser, K.Miernik, R.J.Charity, M.Pfutzner, A.Banu, C.R.Bingham, M.Cwiok, I.G.Darby, W.Dominik, J.M.Elson, T.Ginter, R.Grzywacz, Z.Janas, M.Karny, A.Korgul, S.N.Liddick, K.Mercurio, M.Rajabali, K.Rykaczewski, R.Shane, L.G.Sobotka, A.Stolz, L.Trache, R.E.Tribble, A.H.Wuosmaa, M.V.Zhukov

Complete correlation studies of two-proton decays: 6Be and 45Fe

NUCLEAR REACTIONS 1H(10B, n), E not given; Ni(58Ni, X)45Fe, E=161 MeV/nucleon; measured Ep, Ip, Eα, Iα, product energy and angular correlation distributions in a kinematically complete experiment. Comparison with three-body cluster model.

RADIOACTIVITY 6Be, 45Fe(2p); measured energy and angular correlation distributions.

doi: 10.1016/j.physletb.2009.04.085
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2009GR11      Phys.Rev. C 80, 034602 (2009)

L.V.Grigorenko, T.D.Wiser, K.Mercurio, R.J.Charity, R.Shane, L.G.Sobotka, J.M.Elson, A.H.Wuosmaa, A.Banu, M.McCleskey, L.Trache, R.E.Tribble, M.V.Zhukov

Three-body decay of 6Be

NUCLEAR REACTIONS 1H(10B, n)10C, E=15 MeV/nucleon; measured Ep, Ip, Eα, Iα, energy and angular correlation distributions in a kinematically complete experiment. Comparison with three-body cluster model.

RADIOACTIVITY 6Be(2p)[from 10C(α)]; measured Ep, Iπ, angular distributions.

NUCLEAR STRUCTURE 6Be, 6He; calculated densities and radial properties of ground-state wave functions. Three-body hyperspherical-harmonics cluster model.

doi: 10.1103/PhysRevC.80.034602
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2009JO03      Phys.Rev. C 80, 014321 (2009)

E.K.Johansson, D.Rudolph, I.Ragnarsson, L.-L.Andersson, D.A.Torres, C.Andreoiu, C.Baktash, M.P.Carpenter, R.J.Charity, C.J.Chiara, J.Ekman, C.Fahlander, O.L.Pechenaya, W.Reviol, R.du Rietz, D.G.Sarantites, D.Seweryniak, L.G.Sobotka, C.H.Yu, S.Zhu

Thorough γ-ray and particle decay investigations of 58Ni

NUCLEAR REACTIONS 28Si(36Ar, 2pα), E=136, 143, 148 MeV; measured Eγ, Iγ, Ep, Ip, Eα, (particle)γ-, nγ-, pγ-, αγ-, γγ-coin, γγ(θ), DCO. 58Ni; deduced levels, J, π, multipolarity, mixing ratio, bands and configurations. 57Co, 54Fe; deduced levels, J, π from prompt proton and α emission from 58Ni high-spin states. Comparison with large-scale shell model and cranked Nilsson-Strutinsky calculations.

doi: 10.1103/PhysRevC.80.014321
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2008AN06      Eur.Phys.J. A 36, 251 (2008)

L.-L.Andersson, D.Rudolph, E.K.Johansson, D.A.Torres, B.G.Carlsson, I.Ragnarsson, C.Andreoiu, C.Baktash, M.P.Carpenter, R.J.Charity, C.J.Chiara, J.Ekman, C.Fahlander, C.Hoel, O.L.Pechenaya, W.Reviol, R.du Rietz, D.G.Sarantites, D.Seweryniak, L.G.Sobotka, C.H.Yu, S.Zhu

Extensive γ-ray spectroscopy of normally and superdeformed structures in 6129Cu32

NUCLEAR REACTIONS 28Si(36Ar, 3p), E=142, 143, 148 MeV; measured Eγ, Iγ, En, In, charged-particle spectra, (proton)γ-, γγ-coin. 61Cu deduced energy levels, J, π, band structure, configurations, transition intensities and multipolarities using directional correlations of oriented states analysis. Comparison with shell model and cranked Nilsson-Strutinsky calculations. Gammasphere and Microball arrays. Enriched target.

doi: 10.1140/epja/i2008-10590-9
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2008CH28      Phys.Rev. C 78, 054307 (2008)

R.J.Charity, S.A.Komarov, L.G.Sobotka, J.Clifford, D.Bazin, A.Gade, J.Lee, S.M.Lukyanov, W.G.Lynch, M.Mocko, S.P.Lobastov, A.M.Rogers, A.Sanetullaev, M.B.Tsang, M.S.Wallace, R.G.T.Zegers, S.Hudan, C.Metelko, M.A.Famiano, A.H.Wuosmaa, M.J.van Goethem

Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using a 12Be beam

NUCLEAR REACTIONS H, C(12Be, X), E=50 MeV/nucleon; measured particle spectra, (particle)(particle)-coin, angular distributions. 6,7,9Li, 8,9,10Be, 12,13B; deduced levels, J, π, widths, isospins.

doi: 10.1103/PhysRevC.78.054307
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2008JO04      Phys.Rev. C 77, 064316 (2008)

E.K.Johansson, D.Rudolph, L.-L.Andersson, D.A.Torres, I.Ragnarsson, C.Andreoiu, C.Baktash, M.P.Carpenter, R.J.Charity, C.J.Chiara, J.Ekman, C.Fahlander, C.Hoel, O.L.Pechenaya, W.Reviol, R.du Rietz, D.G.Sarantites, D.Seweryniak, L.G.Sobotka, C.H.Yu, S.Zhu

Prompt proton decay and deformed bands in 56Ni

NUCLEAR REACTIONS 28Si(36Ar, 2α), E=142, 143, 148 MeV; measured Eγ, Iγ, γγ-coin, angular distributions, multipolarities. 56Ni; deduced levels, J, π, bands, deformation parameters. Comparison with cranked Nilsson-Strutinsky calculations.

RADIOACTIVITY 56Ni(p); measured proton spectra. 55Co; deduced levels, J, π.

doi: 10.1103/PhysRevC.77.064316
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2008ME11      Phys.Rev. C 78, 031602 (2008)

K.Mercurio, R.J.Charity, R.Shane, L.G.Sobotka, J.M.Elson, M.Famiano, A.H.Wuosmaa, A.Banu, C.Fu, L.Trache, R.E.Tribble, A.M.Mukhamedzhanov

Correlated two-proton decay from 10C

NUCLEAR REACTIONS Be, C(10C, 10C'), E=10.7 MeV; measured proton spectra, α spectra, αp-, pp-coin from excited states. 10C; deduced levels, correlated 2p decay mode.

doi: 10.1103/PhysRevC.78.031602
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2008MO15      Phys.Rev. C 78, 024612 (2008)

M.Mocko, M.B.Tsang, D.Lacroix, A.Ono, P.Danielewicz, W.G.Lynch, R.J.Charity

Transport model simulations of projectile fragmentation reactions at 140 MeV/nucleon

NUCLEAR REACTIONS 9Be(40Ca, X), (48Ca, X), (58Ni, X), (64Ni, X), E=140 MeV/nucleon; calculated excitation energies, fragmentation cross sections, transmission corrections, mass distributions. Comparison with experimental data. Heavy-ion phase space exploration and antisymmetrized molecular dynamics models.

doi: 10.1103/PhysRevC.78.024612
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2008TO15      Phys.Rev. C 78, 054318 (2008)

D.A.Torres, F.Cristancho, L.-L.Andersson, E.K.Johansson, D.Rudolph, C.Fahlander, J.Ekman, R.du Rietz, C.Andreoiu, M.P.Carpenter, D.Seweryniak, S.Zhu, R.J.Charity, C.J.Chiara, C.Hoel, O.L.Pechenaya, W.Reviol, D.G.Sarantites, L.G.Sobotka, C.Baktash, C.-H.Yu, B.G.Carlsson, I.Ragnarsson

Deformations and magnetic rotations in the 60Ni nucleus

NUCLEAR REACTIONS 28Si(36Ar, 4p), E=134, 143, 148 MeV; measured Eγ, Iγ, γγ-coin, angular distributions. 60Ni; deduced levels, J, π, multipolarity, mixing ratios, B(M1), B(E2). Comparison with cranked Nilsson Strutinsky calculations.

doi: 10.1103/PhysRevC.78.054318
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2007CH39      Phys.Rev. C 75, 051304 (2007)

R.J.Charity, K.Mercurio, L.G.Sobotka, J.M.Elson, M.Famiano, A.Banu, C.Fu, L.Trache, R.E.Tribble

Decay of 10C excited states above the 2p + 2α threshold and the contribution from "democratic" two-proton emission

NUCLEAR REACTIONS 9Be(10C, 10C), E=10.7 MeV/nucleon; measured Ep, Eα, 2p2α decay of the excited states; 10C; deduced level energies and intrinsic widths for particle unbound states.

doi: 10.1103/PhysRevC.75.051304
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2007CH72      Phys.Rev. C 76, 044314 (2007)

R.J.Charity, J.M.Mueller, L.G.Sobotka, W.H.Dickhoff

Dispersive-optical-model analysis of the asymmetry dependence of correlations in Ca isotopes

NUCLEAR REACTIONS 40Ca(p, p), E=17.57-200.0 MeV; 42,44Ca(p, p), E=21.0-65.0 MeV; 48Ca(p, p), E=8.0-200.0 MeV; 40Ca(n, n), E=9.9-185.0 MeV; analyzed differential cross sections, angular distributions, polarization asymmetry, widths, rms radii and spectroscopic factors. Deduced optical-model parameters. 60Ca, 70Ca deduced prediction for particle stability.

doi: 10.1103/PhysRevC.76.044314
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2007CH81      Phys.Rev. C 76, 064313 (2007)

R.J.Charity, S.A.Komarov, L.G.Sobotka, J.Clifford, D.Bazin, A.Gade, J.Lee, S.M.Lukyanov, W.G.Lynch, M.Mocko, S.P.Lobastov, A.M.Rogers, A.Sanetullaev, M.B.Tsang, M.S.Wallace, S.Hudan, C.Metelko, M.A.Famiano, A.H.Wuosmaa, M.J.van Goethem

Particle decay of 12Be excited states

NUCLEAR REACTIONS H, 12C(12Be, X), E=50 MeV/nucleon; measured charged particle spectra. 12Be; measured breakup cross sections for decay modes α+8He, 6He+6He, 3H+9Li, p+11Li; deduced excitation energies.

doi: 10.1103/PhysRevC.76.064313
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2007HO01      Phys.Rev. C 75, 017601 (2007)

C.Hoel, L.G.Sobotka, R.J.Charity

Asymmetry dependence of the caloric curve for mononuclei

doi: 10.1103/PhysRevC.75.017601
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2007KO43      Phys.Rev. C 75, 064611 (2007)

S.Komarov, R.J.Charity, C.J.Chiara, W.Reviol, D.G.Sarantites, L.G.Sobotka, A.L.Caraley, M.P.Carpenter, D.Seweryniak

Search for the fade out of a collective enhancement of the nuclear level density

NUCLEAR REACTIONS 160Gd(18O, X)178Hf, E=79-156 MeV; measured Eα, Eγ, particle γ-coinc. Deduced total cross sections for xn channels. Compared results to model calculations.

doi: 10.1103/PhysRevC.75.064611
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2007LI52      Phys.Rev. C 76, 034603 (2007)

T.X.Liu, W.G.Lynch, M.B.Tsang, X.D.Liu, R.Shomin, W.P.Tan, G.Verde, A.Wagner, H.F.Xi, H.S.Xu, B.Davin, Y.Larochelle, R.T.de Souza, R.J.Charity, L.G.Sobotka

Isospin diffusion observables in heavy-ion reactions

doi: 10.1103/PhysRevC.76.034603
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