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NSR database version of May 23, 2024.

Search: Author = A.Magilligan

Found 8 matches.

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2021BL02      Eur.Phys.J. A 57, 28 (2021)

B.Blank, N.Adimi, M.Alcorta, A.Bey, M.J.G.Borge, B.A.Brown, F.de Oliveira Santos, C.Dossat, H.O.U.Fynbo, J.Giovinazzo, H.H.Knudsen, M.Madurga, A.Magilligan, I.Matea, A.Perea, K.Summerer, O.Tengblad, J.C.Thomas

Detailed study of the decay of 32Ar

RADIOACTIVITY 32Ar(EC), (β+p); measured decay products, Ep, Ip, Eγ, Iγ, p-γ-coin.; deduced γ-ray energies and intensities, branching ratios, energy levels, J, π, Gamow-Teller strength distribution B(GT). Comparison with shell-model calculations.

doi: 10.1140/epja/s10050-020-00341-3
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Data from this article have been entered in the XUNDL database. For more information, click here.

2021KA45      Phys.Rev. C 104, L061303 (2021)

M.Kamil, S.Triambak, A.Magilligan, A.Garcia, B.A.Brown, P.Adsley, V.Bildstein, C.Burbadge, A.Diaz Varela, T.Faestermann, P.E.Garrett, R.Hertenberger, N.Y.Kheswa, K.G.Leach, R.Lindsay, D.J.Marin-Lambarri, F.Ghazi Moradi, N.J.Mukwevho, R.Neveling, J.C.Nzobadila Ondze, P.Papka, L.Pellegri, V.Pesudo, B.M.Rebeiro, M.Scheck, F.D.Smit, H.-F.Wirth

Isospin mixing and the cubic isobaric multiplet mass equation in the lowest T=2, A=32 quintet

ATOMIC MASSES 32Ar, 32Cl, 32S, 32P, 32Si; analyzed experimental masses by a cubic fit to the isobaric multiplet mass equation (IMME) for the lowest isospin T=2 quintet in A=32 nuclei; investigated isospin mixing by combining high-resolution experimental data for proton spectrum from 32Ar β-delayed proton decay, and from triton spectrum in 32S(3He, t) reaction with the state-of-the-art shell-model calculations; evaluated isospin mixing matrix elements; extracted cubic and quartic coefficients of the IMME; deduced that isospin mixing with nonanalog T=1 states contributes to the IMME breakdown. 32Ar; analyzed experimental β-delayed proton spectrum by R-matrix fit; calculated proton emission amplitudes from states in 32Cl.

doi: 10.1103/PhysRevC.104.L061303
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2021MA73      Phys.Rev. C 104, L051302 (2021)

A.Magilligan, B.A.Brown, S.R.Stroberg

Data-driven configuration-interaction Hamiltonian extrapolation to 60Ca

NUCLEAR STRUCTURE 46,47,48,49,50,51,52,53,54,55,56,57,58,59,60Ca; calculated levels, J, π, S(2n); comparison of the two-body matrix elements (TBME) between the UFP-CA and the initial IMSRG interaction; deduced likely doubly magic nature of 60Ca at a level similar to that of 68Ni. State-of-the-art in-medium similarity renormalization group (IMSRG) interaction, with universal fp shell interaction for calcium isotopes (UFP-CA). Comparison with experimental data.

doi: 10.1103/PhysRevC.104.L051302
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2021SU03      Phys.Rev. C 103, 014322 (2021)

L.J.Sun, M.Friedman, T.Budner, D.Perez-Loureiro, E.Pollacco, C.Wrede, B.A.Brown, M.Cortesi, C.Fry, B.E.Glassman, J.Heideman, M.Janasik, A.Kruskie, A.Magilligan, M.Roosa, J.Stomps, J.Surbrook, P.Tiwari

25Si β+-decay spectroscopy

RADIOACTIVITY 25Si(β+), (EC), (β+p)[from 9Be(36Ar, X), E=150 MeV/nucleon from the K500 and K1200 Coupled Cyclotron Facility at NSCL-MSU, followed by purification of 25Si beam by A1900 fragment separator]; measured Eγ, Iγ, γγ- and pγ-coin, E(p), I(p), half-life of 25Si decay using the Gaseous Detector with Germanium Tagging (GADGET) system of a proton detector and the SeGA array. 24Mg, 25Al; deduced levels, J, π, %Iβ+ feedings, %Iβp, γ branching ratios, logft, B(GT), Γγp and half-life for the 2673-keV level in 25Al, Γγ and Γγp for T=3/2 IAS in 25Al at 7902 keV. Comparison with shell-model calculations of levels, Jπ, β feedings, logft and B(GT) using USDC and USDI Hamiltonians, and with the experimental and theoretical decay characteristics of 25Na β- decay to 25Mg. Comparison with earlier experimental results.

doi: 10.1103/PhysRevC.103.014322
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2020LO05      Phys.Rev. C 101, 031303 (2020)

B.Longfellow, A.Gade, J.A.Tostevin, E.C.Simpson, B.A.Brown, A.Magilligan, D.Bazin, P.C.Bender, M.Bowry, B.Elman, E.Lunderberg, D.Rhodes, M.Spieker, D.Weisshaar, S.J.Williams

Two-neutron knockout as a probe of the composition of states in 22Mg, 23Al, and 24Si

NUCLEAR REACTIONS 9Be(24Mg, 22Mg), E=95 MeV/nucleon; 9Be(25Al, 23Al), E=102 MeV/nucleon; 9Be(26Si, 24Si), E=109 MeV/nucleon, [secondary beams of 24Mg, 25Al and 26Si from 9Be(36Ar, X), E=150 MeV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured reaction products, Eγ, Iγ, parallel momentum distributions using S800 spectrograph for particles and 192-element caesium-iodide scintillator array CAESAR for γ detection. 22Mg, 23Al, 24Si; deduced levels, J, π. Comparison with eikonal reaction theory and shell model calculations. Relevance to 23Al(p, γ)24Si astrophysical reaction rates.

doi: 10.1103/PhysRevC.101.031303
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2519. Data from this article have been entered in the XUNDL database. For more information, click here.

2020MA25      Phys.Rev. C 101, 064312 (2020)

A.Magilligan, B.A.Brown

New isospin-breaking "USD" Hamiltonians for the sd shell

NUCLEAR STRUCTURE 17,18,19,20,21,22,23,24,25,26O, 17,18,19,20,21,22,23,24,25,26F, 18,19,20,21,22,23,24,25,26,27,28Ne, 19,20,21,22,23,24,25,26,27,28,29Na, 20,21,22,23,24,25,26,27,28,29,30Mg, 23,24,25,26,27,28,29,30,31,32,33Al, 24,25,26,27,28,29,30,31,32,33,34Si, 27,28,29,30,31,32,33,34,35P, 28,29,30,31,32,33,34,35,36S, 31,32,33,34,35,36,37Cl, 32,33,34,35,36,37,38Ar, 35,36,37,38,39K, 36,37,38,39Ca; calculated two-body matrix elements (TBME) in T=0 and 1 isospin formalisms, Thomas-Ehrman shifts as a function of S(p), coefficients for the lowest lying triplets, quartets, and quintets for the IMMEs in the sd shell ground state binding energies, proton-drip line, S(p), S(2p), S(n) using two universal sd shell Hamiltonians with Coulomb and isospin symmetry-breaking interactions. Developed four new "USD" interactions of two kinds, USDC and USDI for precise predictions of isospin mixing in low-lying states, and USDCm and USDIm for mirror energy differences. Comparison with experimental data, and with 2016 atomic mass evaluation. 31Ar; calculated S(2p) and compared with experimental value. 31S, 32S; calculated isospin-mixing matrix elements between the sixth and eighth 3/2+ sd-shell levels in 31S, and the second and third 1+ sd-shell levels in 32S.

doi: 10.1103/PhysRevC.101.064312
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2019LO06      Phys.Rev. C 99, 064330 (2019)

B.Longfellow, A.Gade, B.A.Brown, D.Bazin, P.C.Bender, M.Bowry, P.D.Cottle, B.Elman, E.Lunderberg, A.Magilligan, M.Spieker, D.Weisshaar, S.J.Williams

Spectroscopy and lifetime measurements near the proton drip line: 26, 27, 28P

NUCLEAR REACTIONS 9Be(26Si, 26P), (27P, 26P), (28S, 26P), (26Si, 27P), (30S, 27P), (34Ar, 27P), (29P, 28P), (34Ar, 28P), (33Cl, 28P), (30S, 28P), (28Si, 27Si), E=118 MeV/nucleon, [secondary beams from 9Be(36Ar, X), E=150 MeV/nucleon primary beam, followed by fragment separation by A1900 fragment separator at NSCL-MSU facility]; measured reaction products, particle identification plot, Eγ, Iγ using CEASAR and SeGA arrays for γ detection and the S800 spectrograph focal plane detectors for charged particle identification. 26,27,28P, 27Si; deduced levels, J, π, level half-lives; calculated Thomas-Ehrman shifts applied to energies in mirror nuclei. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.99.064330
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Data from this article have been entered in the XUNDL database. For more information, click here.

2014GA20      Phys.Rev.Lett. 113, 082501 (2014)

A.T.Gallant, M.Brodeur, C.Andreoiu, A.Bader, A.Chaudhuri, U.Chowdhury, A.Grossheim, R.Klawitter, A.A.Kwiatkowski, K.G.Leach, A.Lennarz, T.D.Macdonald, B.E.Schultz, J.Lassen, H.Heggen, S.Raeder, A.Teigelhofer, B.A.Brown, A.Magilligan, J.D.Holt, J.Menendez, J.Simonis, A.Schwenk, J.Dilling

Breakdown of the Isobaric Multiplet Mass Equation for the A=20 and 21 Multiplets

ATOMIC MASSES 20,21Mg; measured time-of-flight ion cyclotron resonance; deduced masses. Comparison with shell model calculations, AME2012 mass evaluation.

doi: 10.1103/PhysRevLett.113.082501
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