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NSR database version of April 26, 2024.

Search: Author = R.Dungan

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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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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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2016MI02      Phys.Rev. C 93, 014306 (2016)

A.J.Mitchell, C.J.Lister, E.A.McCutchan, M.Albers, A.D.Ayangeakaa, P.F.Bertone, M.P.Carpenter, C.J.Chiara, P.Chowdhury, J.A.Clark, P.Copp, H.M.David, A.Y.Deo, B.DiGiovine, N.D'Olympia, R.Dungan, R.D.Harding, J.Harker, S.S.Hota, R.V.F.Janssens, F.G.Kondev, S.H.Liu, A.V.Ramayya, J.Rissanen, G.Savard, D.Seweryniak, R.Shearman, A.A.Sonzogni, S.L.Tabor, W.B.Walters, E.Wang, S.Zhu

ψ-soft ¹⁴⁶Ba and the role of nonaxial shapes at N ≈ 90

RADIOACTIVITY ¹⁴⁶Cs(β^-)[from ²⁵²Cf SF and mass separation at CARIBU-ANL facility]; measured Eγ, Iγ, βγ-, βγγ-coin using SATURN detection system at ANL. ¹⁴⁶Ba; deduced levels, J, π, limits of β^- branching ratios. Level systematics in even-A N=90 isotones with Z=56-68, and those of g.s., β- and γ-bands in ¹⁴⁶Ba, ¹⁴⁸Ce, ¹⁵⁰Nd. Investigation of nuclear shape transitions. Comparison with interacting boson approximation (IBA) model predictions.

doi: 10.1103/PhysRevC.93.014306
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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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Data from this article have been entered in the XUNDL database. For more information, click here.