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NSR database version of May 24, 2024.

Search: Author = T.B.Webb

Found 11 matches.

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


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


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


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


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


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


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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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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Note: The following list of authors and aliases matches the search parameter T.B.Webb: , T.B.WEBB