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NSR database version of April 25, 2024.

Search: Author = B.Abromeit

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2022HA16      Phys.Rev. C 105, 054307 (2022)

R.A.Haring-Kaye, F.Palombi, J.Doring, S.L.Tabor, B.Abromeit, R.Lubna, P.-L.Tai, V.Tripathi, A.Volya, J.M.VonMoss, D.C.Venegas-Vargas, C.L.Tan, M.J.Heeschen, K.Q.Le, B.L.Harbin

Onset of band structure in ⁷⁰Ga

NUCLEAR REACTIONS ⁶²Ni(¹⁴C, npα), E=50 MeV; measured Eγ, Iγ, γ(θ), γγ-coin; deduced DCO ratios, linear polarization. ⁷⁰Ga; deduced levels, J, π, δ, band structure, configurations; calculated total Routhian surfaces in (β(-2), γ) plane. ^69,70,71Ga; calculated levels, J, π. Calculations with shell-model using the JUN45 interaction. Systematics of yrast and near-yrast states in ⁶²Ga, ⁶⁴Ga, ⁶⁶Ga, ⁶⁸Ga, ⁷⁰Ga. Array of 10 Compton-suppressed Ge detectors at John D. Fox Superconducting Accelerator Facility at Florida State University (FSU).

doi: 10.1103/PhysRevC.105.054307
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2022RU04      Eur.Phys.J. A 58, 107 (2022)

E.Rubino, S.L.Tabor, V.Tripathi, R.S.Lubna, B.Abromeit, J.M.Allmond, L.T.Baby, D.D.Caussyn, K.Kravvaris, A.Volya

Multiparticle-hole excitations in nuclei near N = Z = 20: ⁴¹K

NUCLEAR REACTIONS ²⁶Mg(¹⁸O, 2np), (¹⁸O, 3n), E=50 MeV; measured reaction products, Eγ, Iγ. ⁴¹K, ⁴¹Ca; deduced γ-ray energies and relative intensities, high-spin states, level scheme, J, π. Comparison with spsdpf cross-shell FSU shell model interaction calculations. The Florida State University (FSU) John D. Fox Superconducting Linear Accelerator Laboratory. The FSU high-purity germanium detector array.

doi: 10.1140/epja/s10050-022-00755-1
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2019AB05      Phys.Rev. C 100, 014310 (2019)

B.Abromeit, S.L.Tabor, V.Tripathi, R.S.Lubna, D.Caussyn, R.Dungan, K.Kravvaris, E.Rubino, P.-L.Tai, A.Volya

High spin structure of ³⁹Ar and the FSU cross-shell interaction

NUCLEAR REACTIONS ²⁷Al(¹⁴C, np), E=25.6 MeV; measured Eγ, Iγ, Ep, Ip, γγ- and pγ-coin, γγ(θ)(DCO) using Compton suppressed FSU γ detector array and silicon ΔE-E telescope for proton detection at Florida State University FN tandem accelerator facility. ³⁹Ar; deduced levels, J, π. Comparison with shell model calculations using the FSU cross-shell interaction, and with previous experimental results. ³⁸Ar(d, p)³⁹Ar; calculated spectroscopic factors using the shell model with the FSU cross-shell interaction, and compared with available experimental results.

NUCLEAR STRUCTURE ^38,39Ar; calculated levels, J, π using shell model with the FSU cross-shell interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.100.014310
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2019AB06      Phys.Rev. C 100, 014323 (2019)

B.Abromeit, V.Tripathi, H.L.Crawford, S.N.Liddick, S.Yoshida, Y.Utsuno, P.C.Bender, B.P.Crider, R.Dungan, P.Fallon, K.Kravvaris, N.Larson, R.S.Lubna, T.Otsuka, C.J.Prokop, A.L.Richard, N.Shimizu, S.L.Tabor, A.Volya

Β^- decay of T_z = +11/2 isotopes ³⁷Al and ³⁹Si: Understanding Gamow-Teller strength distribution in neutron-rich nuclei

RADIOACTIVITY ³⁷Al, ^37,39,40Si, ^37,39P(β^-)[from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon, followed by fragment separation using A1900 separator at NSCL-MSU]; ³⁷Al, ³⁹Si(β^-n); measured β, Eγ, Iγ, βγ-coin, half-lives of decays of ³⁷Al, ³⁷Si and ³⁹Si, %β^-n for decays of ³⁷Al and ³⁹Si using β-counting system (BCS) at NSCL-MSU which consisted of silicon PIN detectors, segmented planar Ge double-sided strip detector (GeDSSD) for implants and β^- detection, and an array of 16 segmented Ge detectors for γ rays. ³⁶Si, ³⁷Si, ^37,39,40P, ^37,39S; deduced levels, J, π, β feedings, logft, %β^-n. Systematics of low-lying positive π states in ^35,37,39P, and T_1/2 in N=20-28 Si isotopes. Comparison with shell model calculations.

NUCLEAR STRUCTURE ^35,37,39P, ^37,39S, ³⁷Si; calculated levels, J, π, logft values. Shell model calculations using the SDPFSDG-MU interaction. Comparison with experimental data from the present experiment, and the evaluated data in the ENSDF database at NNDC.

doi: 10.1103/PhysRevC.100.014323
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2019LU11      Phys.Rev. C 100, 034308 (2019)

R.S.Lubna, K.Kravvaris, S.L.Tabor, V.Tripathi, A.Volya, E.Rubino, J.M.Allmond, B.Abromeit, L.T.Baby, T.C.Hensley

Structure of ³⁸Cl and the quest for a comprehensive shell model interaction

NUCLEAR REACTIONS ²⁶Mg(¹⁴C, np)³⁸Cl, E=30, 37 MeV; measured Eγ, Iγ, Ep, Ip, γγ- and pγ-coin, γγ(θ)(DCO), γ-polarization asymmetry using enriched target, FSU array of three Clover HPGe detectors and three single-crystal Ge detectors for γ detection, and ΔE-E telescope for particles at FSU Tandem accelerator. ³⁸Cl; deduced levels, J, π, multipolarities, configurations. Comparison with shell-model calculations using the FSU effective interaction for the spsdfp space.²⁴Mg, ³⁸Ar; deduced polarization asymmetries and multipolarities for two γ rays in each nucleus.

NUCLEAR STRUCTURE ³³P, ^34,36,38Cl; calculated levels, J, π, intruder states, theoretical Occupancies, spectroscopic factors, level half-lives for ³⁸Cl, occupation number of πf_7/2 and νf_7/2 orbitals. Z=6-23, A=13-51; analyzed and fitted energy levels for 74 nuclei to develop the FSU interaction. Shell-model calculations using the FSU effective interaction for the spsdfp model space. Comparison with experimental data.

doi: 10.1103/PhysRevC.100.034308
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2017CO07      Phys.Rev. C 95, 064323 (2017)

J.R.Cottle, V.Tripathi, B.A.Brown, B.Abromeit, J.M.Allmond, M.Anastasiou, L.T.Baby, J.S.Baron, P.D.Cottle, R.Dungan, T.C.Hensley, K.W.Kemper, R.S.Lubna, N.Rijal, E.Rubino, S.L.Tabor, P.-L.Tai, K.Villafana, I.Wiedenhoever

Complete spectroscopy of ²¹¹Po below 2.0 MeV via the (α, n) reaction

NUCLEAR REACTIONS ²⁰⁸Pb(α, n), E=24 MeV; measured Eγ, Iγ, γγ-coin using enriched target and an array of six HPGe Clover detectors at the FN tandem accelerator of Florida State University. ²¹¹Po; deduced levels, J, π, configurations. Comparison with shell model calculation using the modified Kuo-Herling interaction.

doi: 10.1103/PhysRevC.95.064323
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2017HE15      Phys.Rev. C 96, 034325 (2017)

T.C.Hensley, P.D.Cottle, V.Tripathi, B.Abromeit, M.Anastasiou, L.T.Baby, J.S.Baron, D.Caussyn, R.Dungan, K.W.Kemper, R.S.Lubna, S.L.Miller, N.Rijal, M.A.Riley, S.L.Tabor, P.-L.Tai, K.Villafana

High spin spectroscopy in ²¹⁹Ra: Search for the lower mass boundary of the region of statically octupole-deformed nuclei

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁴C, 3n), E=68 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO) using an array of Compton-suppressed seven single crystal HPGe detectors and three clover-style HPGe detectors at the FN Tandem accelerator laboratory of Florida State University. ²¹⁹Ra; deduced high-spin levels, J, π, multipolarities, octupole bands, evidence for stable octupole deformation. Systematics of energy splitting between candidates for simplex partner bands in ^219,221Ra, ^221,223Th.

doi: 10.1103/PhysRevC.96.034325
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2017TR02      Phys.Rev. C 95, 024308 (2017)

V.Tripathi, R.S.Lubna, B.Abromeit, H.L.Crawford, S.N.Liddick, Y.Utsuno, P.C.Bender, B.P.Crider, R.Dungan, P.Fallon, K.Kravvaris, N.Larson, A.O.Macchiavelli, T.Otsuka, C.J.Prokop, A.L.Richard, N.Shimizu, S.L.Tabor, A.Volya, S.Yoshida

β decay of ^{38, 40}Si (T_z =+5, +6) to low-lying core excited states in odd-odd ^38-40P isotopes

RADIOACTIVITY ^38,40Si(β^-), (β^-n)[from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon using A1900 separator at NSCL-MSU facility]; measured Eγ, Iγ, Eβ, γγ-coin, β-correlated γ spectra, half-lives and delayed-neutron probabilities (P_n) of decays of ³⁸Si and ⁴⁰Si using planar germanium double-sided strip detector (GeDSSD) and SeGA array. ^38,40P; deduced levels, J, π, β feedings log ft values. Comparison with known experimental level schemes of ³⁴ and ³⁶P, and with shell model calculations using SDPF-MU interaction. ^36,38,40Si(β^-); calculated half-lives and log ft values of decays of Si isotopes, beta-delayed neutron probabilities (P_n) using shell model, and compared with experimental values.

NUCLEAR STRUCTURE ^34,36,38,40P; calculated levels, J, π, proton and neutron occupancies for the ground state and the three excited 1+ states, Gamow-Teller matrix elements for the 1+ states. Shell model calculations with SDPF-MU interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.024308
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2016DU02      Phys.Rev. C 93, 021302 (2016)

R.Dungan, S.L.Tabor, V.Tripathi, A.Volya, K.Kravvaris, B.Abromeit, D.D.Caussyn, S.Morrow, J.J.Parker, P.-L.Tai, J.M.VonMoss

Radiative decay of neutron-unbound intruder states in ¹⁹O

NUCLEAR REACTIONS ⁹Be(¹⁴C, α)¹⁹O, E=30, 35 MeV; measured Eγ, Iγ, αγ-, αγγ-coin using Compton suppressed Ge detector for γ rays and Si ΔE-E telescope for α particles at FSU John D. Fox Superconducting Laboratory. ¹⁹O; deduced levels, states above S(n), J, π. Comparison with shell model calculations in the 0p-0d-1s model space using the psdu interaction. Discussed competition between electromagnetic and neutron emission from unbound states, and comparison with an experimental neutron resonance yield curve from ¹⁸O(n, γ). Level systematics of ^17,19,21O.

NUCLEAR STRUCTURE ¹⁹O; calculated levels, J, π, Γ_n, Γ_γ, spectroscopic factors. Shell model calculations using the psdu interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.93.021302
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2016DU24      Phys.Rev. C 94, 064305 (2016)

R.Dungan, S.L.Tabor, R.S.Lubna, A.Volya, V.Tripathi, B.Abromeit, D.D.Caussyn, K.Kravvaris, P.-L.Tai

High-spin states in ²⁹Al and ²⁷Mg

NUCLEAR REACTIONS ¹⁸O(¹⁴C, 2np), (¹⁴C, nα), E=40 MeV; measured proton and α spectra using ΔE-E telescope, Eγ, Iγ, pγγ-, αγγ-coin using Florida State University Compton suppressed γ-detector array. ²⁷Mg, ²⁹Al; deduced levels, J, π. Comparison with shell model calculations using USDA interaction.

NUCLEAR STRUCTURE ²⁷Mg, ²⁹Al; calculated levels, J, π, occupancies of 1s-0d orbitals, neutron decay widths for low- and high-spin unbound states, spectroscopic factors. Shell-model calculations using the USDA interaction, and the WBP-a interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.94.064305
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2016HU02      Phys.Rev. C 93, 024315 (2016)

R.O.Hughes, J.T.Burke, R.J.Casperson, J.E.Escher, S.Ota, J.J.Ressler, N.D.Scielzo, R.A.E.Austin, B.Abromeit, N.J.Foley, E.McCleskey, M.McCleskey, H.I.Park, T.J.Ross, A.Saastamoinen

Investigation of ⁸⁸Y via (p, dγ) reactions

NUCLEAR REACTIONS ⁸⁹Y(p, d), E=28.5 MeV; measured E(d), I(d), Eγ, Iγ, dγ-, dγγ-coin, dγ(t) using STARLiTeR array of Si detectors for deuteron detection and five HPGe clover detectors for γ rays at Texas A and M Cyclotron Institute. ⁸⁸Y; deduced levels, J, π, level population intensities. Discussed effect of γ-branching ratios in ⁸⁸Y on determination of ⁸⁷Y(n, γ) cross section via surrogate method.

doi: 10.1103/PhysRevC.93.024315
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2015LI33      Phys.Rev. C 92, 024319 (2015); Erratum Phys.Rev. C 94, 069904 (2016)

S.N.Liddick, W.B.Walters, C.J.Chiara, R.V.F.Janssens, B.Abromeit, A.Ayres, A.Bey, C.R.Bingham, M.P.Carpenter, L.Cartegni, J.Chen, H.L.Crawford, I.G.Darby, R.Grzywacz, J.Harker, C.R.Hoffman, S.Ilyushkin, F.G.Kondev, N.Larson, M.Madurga, D.Miller, S.Padgett, S.V.Paulauskas, M.M.Rajabali, K.Rykaczewski, D.Seweryniak, S.Suchyta, S.Zhu

Analogous intruder behavior near Ni, Sn, and Pb isotopes

RADIOACTIVITY ⁶⁹Fe, ⁶⁹Co, ⁶⁹Ni(β^-)[from ⁹Be(⁷⁸Kr, X), E=140 MeV/nucleon]; measured Eγ, Iγ, (ion)γ- and βγ- correlated events, half-lives of ground states of ⁶⁹Co, ⁶⁹Fe, and half-life of an isomer in ⁶⁹Co, absolute intensities of γ rays from the decay of directly produced ⁶⁹Co and that from the decay of ⁶⁹Fe using BCS system and SEGA array at NSCL-MSU facility. ⁶⁹Cu, ⁶⁹Co; deduced levels in ⁶⁹Cu, and isomer in ⁶⁹Co, J, π, intruder configuration; identified and discussed proton particle-hole intruder states originating from excitations across Z=28. ⁶⁸Fe, ⁶⁸Co(β^-); observed γ.

NUCLEAR REACTIONS ²⁰⁸Pb(⁷⁰Zn, X)⁷¹Cu, E=440 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array at ATLAS-ANL facility. ⁷¹Cu; deduced high-spin levels, J, π, band; discussed systematics of level structure and proton particle-hole intruder states in ^67,69,71Cu.

doi: 10.1103/PhysRevC.92.024319
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2015OT02      Phys.Rev. C 92, 054603 (2015)

S.Ota, J.T.Burke, R.J.Casperson, J.E.Escher, R.O.Hughes, J.J.Ressler, N.D.Scielzo, I.J.Thompson, R.A.E.Austin, B.Abromeit, N.J.Foley, E.McCleskey, M.McCleskey, H.I.Park, A.Saastamoinen, T.J.Ross

Spin differences in the ⁹⁰Zr compound nucleus induced by (p, p'), (p, d), and (p, t) surrogate reactions

NUCLEAR REACTIONS ⁹⁰Zr(p, p'), (p, np), ⁹¹Zr(p, d), ⁹²Zr(p, t), E=28.56 MeV; measured light-ion particle spectra, angular distributions, Eγ, Iγ, (particle)γ-coin, using STARLiTeR detector system at Texas A and M cyclotron facility; deduced γ-decay probabilities as functions of ⁹⁰Zr excitation energy, angular momentum, and particle scattering angle. Enriched targets. ^89,90Zr; deduced levels, J, π. ⁸⁹Zr(n, γ); discussed relevance to determination of σ by surrogate reaction approach.

doi: 10.1103/PhysRevC.92.054603
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2015VO12      Phys.Rev. C 92, 034301 (2015)

J.M.VonMoss, S.L.Tabor, V.Tripathi, A.Volya, B.Abromeit, P.C.Bender, D.D.Caussyn, R.Dungan, K.Kravvaris, M.P.Kuchera, R.Lubna, S.Miller, J.J.Parker, P.-L.Tai

Higher-spin structures in ²¹F and ²⁵Na

NUCLEAR REACTIONS ⁹Be(¹⁴C, np), E=30, 35, 45 MeV; ⁹Be(¹⁸O, np), E=35 MeV; measured Ep, Ip, Eγ, Iγ, pγ-, γγ-coin, γ(θ), level half-lives by DSAM using ΔE-E telescopes for particles and Compton-suppressed Ge detectors for γ rays at FSU tandem accelerator. ²¹F, ²⁵Na; deduced levels, J, π, multipolarity, B(M1), B(E1), B(E2). Comparison with previous experimental data, and with shell model calculations using USDA and WBP interactions.

NUCLEAR STRUCTURE ²¹F, ²⁵Na; calculated levels, J, π, B(M1), B(E1), B(E2) using shell model with USDA and WBP interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.034301
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2013LI04      Phys.Rev. C 87, 014325 (2013)

S.N.Liddick, B.Abromeit, A.Ayres, A.Bey, C.R.Bingham, B.A.Brown, L.Cartegni, H.L.Crawford, I.G.Darby, R.Grzywacz, S.Ilyushkin, M.Hjorth-Jensen, N.Larson, M.Madurga, D.Miller, S.Padgett, S.V.Paulauskas, M.M.Rajabali, K.Rykaczewski, S.Suchyta

Low-energy level schemes of ^{66, 68}Fe and inferred proton and neutron excitations across Z=28 and N=40

RADIOACTIVITY ^66,68Mn(β^-)[from ⁹Be(⁸⁶Kr, X), E=140 MeV/nucleon]; measured Eγ, Iγ, (Mn ions)γ-, γγ-coin, Eβ, Iβ, T_1/2 using the BCS system and SeGA array at NSCL facility. ^66,68Fe; deduced levels, J, π, β feedings, logft. ^66,68Fe, ⁶⁸Ni; comparison of experimental levels, J, π with shell-model calculations.

doi: 10.1103/PhysRevC.87.014325
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2012LI02      Phys.Rev. C 85, 014328 (2012)

S.N.Liddick, B.Abromeit, A.Ayres, A.Bey, C.R.Bingham, M.Bolla, L.Cartegni, H.L.Crawford, I.G.Darby, R.Grzywacz, S.Ilyushkin, N.Larson, M.Madurga, D.Miller, S.Padgett, S.Paulauskas, M.M.Rajabali, K.Rykaczewski, S.Suchyta

Low-energy structure of ₂₇⁶⁶Co₃₉ and ₂₇⁶⁸Co₄₁ populated through β decay

RADIOACTIVITY ^66,68Fe(β^-)[from ⁹Be(⁸⁶Kr, X), E=130 MeV/nucleon]; measured energy loss, time of flight, Iβ, Eγ, Iγ, γγ-, (recoil)γ-coin, half-life. A1900 Fragment separator and SeGA array at NSCL facility. ^66,68Co; deduced levels, J, π, multipolarity, logft, spherical and Nilsson model configurations.

doi: 10.1103/PhysRevC.85.014328
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2011LI50      Phys.Rev. C 84, 061305 (2011)

S.N.Liddick, S.Suchyta, B.Abromeit, A.Ayres, A.Bey, C.R.Bingham, M.Bolla, M.P.Carpenter, L.Cartegni, C.J.Chiara, H.L.Crawford, I.G.Darby, R.Grzywacz, G.Gurdal, S.Ilyushkin, N.Larson, M.Madurga, E.A.McCutchan, D.Miller, S.Padgett, S.V.Paulauskas, J.Pereira, M.M.Rajabali, K.Rykaczewski, S.Vinnikova, W.B.Walters, S.Zhu

Shape coexistence along N=40

RADIOACTIVITY ^64,66Mn(IT)[from ⁹Be(⁷⁶Ge, X), E=140 MeV/nucleon]; ^64,66Cr(β^-)[from ⁹Be(⁸⁶Kr, X), E=130 MeV/nucleon]; measured Eγ, Iγ, (fragment)βγ-, γγ-coin, γ(t), half-lives. ^64,66Mn; deduced levels, J, π, beta feedings, log ft, configurations.

doi: 10.1103/PhysRevC.84.061305
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