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NSR database version of April 11, 2024.

Search: Author = R.Hughes

Found 62 matches.

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2022BU13      Phys.Rev. C 105, 045805 (2022)

S.Burcher, K.A.Chipps, R.O.Hughes, C.S.Reingold, A.Saastamoinen, J.T.Harke, N.Cooper, S.Ahn, J.M.Allmond, H.Clark, J.A.Cizewski, M.R.Hall, J.Hooker, H.Jayatissa, K.L.Jones, S.Ota, S.D.Pain, K.Schmidt, A.Simon, S.Upadhyayula

Developing the32S(p, d)31S*(p)(γ) reaction to probe the 30P(p, γ)31S reaction rate in classical novae

NUCLEAR REACTIONS 32S(p, d), E=33 MeV; measured reaction products, Ep, Ip, Eγ, Iγ, deuteron spectra, (deuteron)p-coin, (particle)γ-coin, angular distributions; deduced s(θ). 31S; deduced levels, J, π, proton decay width of excited states, proton decay branching ratios. DWBA analysis. Comparison to other experimental data. Discussed relevance to resonances investigations in astrophysically important 30P(p, γ) reaction. Hyperion setup consisting of 12 Compton-suppressed HPGe clover detectors, a silicon telescope downstream of the target, and a single silicon detector upstream of the target at K150 cyclotron (Texas A-M Cyclotron Institute).

doi: 10.1103/PhysRevC.105.045805
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2746. Data from this article have been entered in the XUNDL database. For more information, click here.


2022RE03      Phys.Rev. C 105, 034612 (2022)

C.S.Reingold, A.Simon, R.O.Hughes, J.T.Harke, K.A.Chipps, S.Burcher, D.T.Blankstien, J.A.Cizewski, N.Cooper, M.Hall, S.Ota, B.Schroeder, S.Upadhyayula

Spin inhibition in ψ-decay probabilities for states above Sn in Sm and Dy nuclei

NUCLEAR REACTIONS 148Sm(p, d), 148Sm, 162Dy(p, t), E=29.55 MeV; measured charged particles, Eγ, Iγ, deuteron and triton spectra, (particle)γ-coin. 146,147Sm, 160Dy; deduced γ-decay probabilities. Investigated the eefect of spin-inhibition for high-spin states above neutron separation threshold. Hyperion setup comprised of Compton-suppressed clover detectors for γ-ray measurements and a ΔE-E telescope for particle energy measurements and identification. Beam from K150 cyclotron at Texas A

doi: 10.1103/PhysRevC.105.034612
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2019AK03      Phys.Rev. C 99, 054601 (2019)

O.A.Akindele, B.S.Alan, J.T.Burke, R.J.Casperson, R.O.Hughes, J.D.Koglin, K.Kolos, E.B.Norman, S.Ota, A.Saastamoinen

Expansion of the surrogate method to measure the prompt fission neutron multiplicity for 241Pu

NUCLEAR REACTIONS 242Pu(α, α'), (α, F), E=53.96 MeV; measured scattered α particles and other reaction products, neutrons, light charged particles p, d, t, 3He, α(fission fragment)- and αn-coin using the NeutronSTARS array for charged particle and neutron detection at the Cyclotron Institute of Texas A and M University. 241Pu(n, F), E<20 MeV; deduced average neutron multiplicity, and derived neutron multiplicity moments as a function of equivalent neutron energy using the surrogate method. Comparison with previous experimental values.

doi: 10.1103/PhysRevC.99.054601
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14570.


2019NA10      Phys.Rev. C 99, 054331 (2019)

F.Naqvi, A.Simon, M.Guttormsen, R.Schwengner, S.Frauendorf, C.S.Reingold, J.T.Burke, N.Cooper, R.O.Hughes, S.Ota, and A.Saastamoinen

Nuclear level densities and γ-ray strength functions in samarium isotopes

NUCLEAR REACTIONS 148,150Sm(p, d), E=28 MeV; measured deuteron spectra, Eγ, Iγ, and (particle)γ-coin using the Hyperion array with ΔE-E telescope and HPGe clover detector array at the Cyclotron Institute of Texas A and M University. 147,149Sm; deduced nuclear level densities (NLDs) and γ strength functions (γSF) using the Oslo method, total B(M1) strength, parameters for giant resonances and the upbend. Comparison with shell model calculations, and with previous experimental results. Systematics of γSF, nuclear level densities, total B(M1) strength, and the parameters for giant resonances, the upbend and scissors resonances in 145,147,149,151Sm.

doi: 10.1103/PhysRevC.99.054331
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2019RA04      Phys.Rev.Lett. 122, 052502 (2019)

A.Ratkiewicz, J.A.Cizewski, J.E.Escher, G.Potel, J.T.Burke, R.J.Casperson, M.McCleskey, R.A.E.Austin, S.Burcher, R.O.Hughes, B.Manning, S.D.Pain, W.A.Peters, S.Rice, T.J.Ross, N.D.Scielzo, C.Shand, K.Smith

Towards Neutron Capture on Exotic Nuclei: Demonstrating (d, pγ) as a Surrogate Reaction for (n, γ)

NUCLEAR REACTIONS 95Mo(d, p), E=12.4 MeV; measured reaction products, Eγ, Iγ; deduced σ. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.122.052502
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019WA33      Phys.Rev. C 100, 064609 (2019)

B.S.Wang, J.T.Harke, O.A.Akindele, R.J.Casperson, R.O.Hughes, J.D.Koglin, K.Kolos, E.B.Norman, S.Ota, A.Saastamoinen

Determining the average prompt-fission-neutron multiplicity for 239Pu(n, f) via a 240Pu(α, α' f) surrogate reaction

NUCLEAR REACTIONS 240Pu(α, α'F), E=53.9 MeV; measured fission fragments, charged particles, scattered α particles, Eα, Iα, E(n), I(n), α(fission fragment)- and αn(fission fragment)-coin using the NeutronSTARS array and NeutronBall at the K150 Cyclotron facility of Texas A and M University; deduced particle-identification plot for p, d, t, 3He and α particles. 239Pu(n, F), E=0.25-26.25 MeV; deduced average prompt-fission-neutron multiplicity using the results from surrogate reaction 240Pu(α, a°F). Comparison with previous experimental results from direct measurements.

doi: 10.1103/PhysRevC.100.064609
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14601.


2018CH34      Phys.Lett. B 782, 652 (2018)

A.Chyzh, P.Jaffke, C.Y.Wu, R.A.Henderson, P.Talou, I.Stetcu, J.Henderson, M.Q.Buckner, S.A.Sheets, R.Hughes, B.Wang, J.L.Ullmann, S.Mosby, T.A.Bredeweg, A.C.Hayes-Sterbenz, J.M.O'Donnell

Dependence of the prompt fission γ-ray spectrum on the entrance channel of compound nucleus: Spontaneous vs. neutron-induced fission

RADIOACTIVITY 240,242Pu(SF); measured decay products, Eγ, Iγ; deduced prompt γ-ray spectra.

NUCLEAR REACTIONS 239,241Pu(n, F), E ∼ 100 keV; measured reaction products, Eγ, Iγ; deduced prompt fission γ-ray energy spectra. Comparison with Monte Carlo Hauser-Feshbach statistical model for the neutron-induced fission.

doi: 10.1016/j.physletb.2018.06.006
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2018CO12      Phys.Rev. C 98, 044618 (2018)

N.Cooper, C.W.Beausang, P.Humby, A.Simon, J.T.Burke, R.O.Hughes, S.Ota, C.Reingold, A.Saastamoinen, E.Wilson

Entry-level spin distributions and relative γ-neutron branching ratios of samarium isotopes populated by the (p, t) reaction

NUCLEAR REACTIONS 150,152,154Sm(p, t), E=25 MeV; measured Eγ, Iγ, γ(θ), E(t), I(t), angular distribution of tritons, and tγ-coin using the Hyperion detector array consisting of STARS array of Si detectors for triton detection and 13 HPGe clovers for γ detection using enriched targets at the K150 cyclotron facility of Texas A and M university. 148,150,152Sm; deduced relative intensities of γ rays from low-lying levels, entry-level spin distributions, and relative average branching ratios for γ-rays above S(n). Comparison with calculated simulated γ spectra from natural-parity levels using DICEBOX and MCγ codes, and probability densities of entry level spins by modeling (p, t) reaction using PTCRUISER code.

doi: 10.1103/PhysRevC.98.044618
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2018ES05      Phys.Rev.Lett. 121, 052501 (2018)

J.E.Escher, J.T.Burke, R.O.Hughes, N.D.Scielzo, R.J.Casperson, S.Ota, H.I.Park, A.Saastamoinen, T.J.Ross

Constraining Neutron Capture Cross Sections for Unstable Nuclei with Surrogate Reaction Data and Theory

NUCLEAR REACTIONS 87Y(n, γ), E<10 MeV; analyzed available data; deduced σ using surrogate reaction data. Comparison with TENDL 2015 and ROSFOND 2010 libraries. 89Y, 92Zr(p, d), E*=6-12 MeV; calculated σ(E, θ), probability of observing specific γ-ray in coincidence with outgoing deuteron; compared with available data.

doi: 10.1103/PhysRevLett.121.052501
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2017MA39      Phys.Rev. C 96, 014318 (2017)

D.A.Matters, F.G.Kondev, N.Aoi, Y.Ayyad, A.P.Byrne, M.P.Carpenter, J.J.Carroll, C.J.Chiara, P.M.Davidson, G.D.Dracoulis, Y.D.Fang, C.R.Hoffman, R.O.Hughes, E.Ideguchi, R.V.F.Janssens, S.Kanaya, B.P.Kay, T.Kibedi, G.J.Lane, T.Lauritsen, J.W.McClory, P.Nieminen, S.Noji, A.Odahara, H.J.Ong, A.E.Stuchbery, D.T.Tran, H.Watanabe, A.N.Wilson, Y.Yamamoto, S.Zhu

In-beam γ-ray spectroscopy studies of medium-spin states in the odd-odd nucleus 186Re

NUCLEAR REACTIONS 186W(d, 2n)186Re, E=12.5, 14.5 MeV; measured Eγ, Iγ, γγ-coin using Clover Array Gamma-Ray spectrometer for Advanced research (CAGRA) at RCNP, Osaka University, and CAESAR spectrometer at the 14UD Pelletron accelerator of the Australian National University. 186Re; deduced high-spin levels, J, π, K-shell conversion coefficients, multipolarities, bands, configurations, branching ratios and gK-gR values. Comparison with multi-quasiparticle blocking calculations.

doi: 10.1103/PhysRevC.96.014318
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Data from this article have been entered in the XUNDL database. For more information, click here.


2017MU04      Phys.Rev. C 95, 015805 (2017)

J.M.Munson, E.B.Norman, J.T.Burke, R.J.Casperson, L.W.Phair, E.McCleskey, M.McCleskey, D.Lee, R.O.Hughes, S.Ota, A.Czeszumska, P.A.Chodash, A.J.Saastamoinen, R.A.E.Austin, A.E.Spiridon, M.Dag, R.Chyzh, M.S.Basunia, J.J.Ressler, T.J.Ross

Decay branching ratios of excited 24Mg

NUCLEAR REACTIONS 24Mg(α, α'), E=40 MeV; measured decay products identified by outgoing α particles, protons and γ rays from the resulting 20Ne, 23Na, and 23Mg daughters, (particle)(particle)-coin, αγ-coin using the STARLiTeR detector array at Texas A and M K150 cyclotron facility; deduced branching ratios for α-, proton- and neutron-emitting channels from the decay of unbound states in 24Mg. Possible surrogate reaction for 12C(12C, α)20Ne, 12C(12C, p)23Na, 12C(12C, n)23Mg reactions of astrophysical interest. 20Ne, 23Na, 23Mg; deduced levels populated by the decay of excited states of 24Mg.

doi: 10.1103/PhysRevC.95.015805
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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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Data from this article have been entered in the XUNDL database. For more information, click here.


2016HU22      Phys.Rev. C 94, 064314 (2016)

P.Humby, A.Simon, C.W.Beausang, J.M.Allmond, J.T.Burke, R.J.Casperson, R.Chyzh, M.Dag, K.Gell, R.O.Hughes, J.Koglin, E.McCleskey, M.McCleskey, S.Ota, T.J.Ross, A.Saastamoinen, T.Tarlow, G.Vyas

Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction

NUCLEAR REACTIONS 152,154Sm(p, t), E=25 MeV; measured triton spectra, Eγ, Iγ, (triton)γ-, (triton)γγ-coin, σ(θ), angular distribution of peak-like structure (PLS) using the STARLiTeR array at Texas A and M cyclotron facility. Enriched targets. 150,152Sm; deduced levels, J, π, L-transfers. DWBA analysis of σ(θ) data. Comparison with evaluated data taken from the ENSDF database.

doi: 10.1103/PhysRevC.94.064314
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Data from this article have been entered in the XUNDL database. For more information, click here.


2016RE02      Phys.Lett. B 752, 311 (2016)

M.W.Reed, G.J.Lane, G.D.Dracoulis, F.G.Kondev, M.P.Carpenter, P.Chowdhury, S.S.Hota, R.O.Hughes, R.V.F.Janssens, T.Lauritsen, C.J.Lister, N.Palalani, D.Seweryniak, H.Watanabe, S.Zhu, W.G.Jiang, F.R.Xu

Impact of triaxiality on the rotational structure of neutron-rich rhenium isotopes

NUCLEAR REACTIONS 192Os(136Xe, X)187Re, 187Re(136Xe, X)189Re, 186W(136Xe, X)191Re, E=6 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced level scheme, γ-ray energies, J, π, rotational bands, triaxiality. Comparison with particle-triaxial-rotor calculations.

doi: 10.1016/j.physletb.2015.11.056
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2016SI07      Phys.Rev. C 93, 034303 (2016)

A.Simon, M.Guttormsen, A.C.Larsen, C.W.Beausang, P.Humby, J.T.Burke, R.J.Casperson, R.O.Hughes, T.J.Ross, J.M.Allmond, R.Chyzh, M.Dag, J.Koglin, E.McCleskey, M.McCleskey, S.Ota, A.Saastamoinen

First observation of low-energy γ-ray enhancement in the rare-earth region

NUCLEAR REACTIONS 152,154Sm(p, dγ), E=25 MeV; measured reaction products, Eγ, Iγ, (particle)γ-coin, γ(θ) using STARLiTeR setup for charged-particles, and Ge clover detectors with Compton suppressors for γ rays at K-150 cyclotron at Texas A and M; deduced level density (LD) and γ-ray strength function (γSF) using OSLO method, multipolarity, enhanced low-energy γ-ray strength for rare-earth nuclei, coexistence with the scissors resonance. Comparison with Hauser-Feshbach calculations. Calculated ratios of Maxwellian-averaged (n, γ) reaction rates at T9=0.15 and 1.5 for A=145-202 Sm isotopes.

doi: 10.1103/PhysRevC.93.034303
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2015HE32      Phys.Rev. C 92, 064317 (2015)

A.Hennig, T.Ahn, V.Anagnostatou, A.Blazhev, N.Cooper, V.Derya, M.Elvers, J.Endres, P.Goddard, A.Heinz, R.O.Hughes, G.Ilie, M.N.Mineva, P.Petkov, S.G.Pickstone, N.Pietralla, D.Radeck, T.J.Ross, D.Savran, M.Spieker, V.Werner, A.Zilges

Collective excitations of 96Ru by means of (p, p'γ) experiments

NUCLEAR REACTIONS 96Ru(p, p'), E=8.4, 7 MeV; measured Ep, Ip, proton angular distributions, Eγ, Iγ, pγ- and γγ-coin, γγ(θ) using YRAST ball spectrometer at WNSL-Yale accelerator facility, level half-lives by DSAM using HORUS γ-ray spectrometer at IKP-Cologne accelerator facility. 96Ru; deduced levels, J, π, multipolarity, mixing ratios, configuration, B(E2), B(M1), B(E1), one-phonon mixed-symmetry excitations of octupole and hexadecapole character, two-phonon mixed-symmetry quintuplet. Comparison with sdg-IBM-2 and shell-model calculations.

NUCLEAR STRUCTURE 96Ru; calculated levels, J, π, B(M1), B(E2) using sdg-IBM-2 and shell-model. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.064317
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Data from this article have been entered in the XUNDL database. For more information, click here.


2015HU02      Phys.Rev. C 91, 024322 (2015)

P.Humby, A.Simon, C.W.Beausang, T.J.Ross, R.O.Hughes, J.T.Burke, R.J.Casperson, J.Koglin, S.Ota, J.M.Allmond, M.McCleskey, E.McCleskey, A.Saastamoinen, R.Chyzh, M.Dag, K.Gell, T.Tarlow, G.Vyas

Improved measurement of the half-life of the Jπ = 8- nuclear isomer 152m2Eu

NUCLEAR REACTIONS 154Sm(p, 3n)152mEu, E=25 MeV; measured Eγ, Iγ, delayed γ, half-lives of 0- and 8- isomers in 152Eu by γ(t) using STARS array for particle detection and LiTer array for γ detection at the Texas A and M, K-150 cyclotron facility. Comparison with earlier experimental results.

RADIOACTIVITY 152Eu(β-), (EC)[from 154Sm(p, 3n), E=25 MeV]; measured Eγ, Iγ, half-life of the 0- isomer in 152Eu. Comparison with earlier experimental results.

doi: 10.1103/PhysRevC.91.024322
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Data from this article have been entered in the XUNDL database. For more information, click here.


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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2014HE28      Phys.Rev. C 90, 051302 (2014)

A.Hennig, M.Spieker, V.Werner, T.Ahn, V.Anagnostatou, N.Cooper, V.Derya, M.Elvers, J.Endres, P.Goddard, A.Heinz, R.O.Hughes, G.Ilie, M.N.Mineva, P.Petkov, S.G.Pickstone, N.Pietralla, D.Radeck, T.J.Ross, D.Savran, A.Zilges

Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones

NUCLEAR REACTIONS 96Ru(p, p'), E=7.0, 8.4 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin, γγ(θ), level half-life by centroid-shift method using YRAST Ball spectrometer and Si detectors at Yale ESTU Tandem accelerator facility, and HORUS γ-detector array and particle-detector array SONIC at Cologne FN Tandem accelerator facility. 96Ru; deduced levels, J, π, branching ratios, multipole mixing ratios, B(M1), B(E2), mixed-symmetry states (MSS) of octupole and hexadecapole character. Evidence for one-phonon mixed-symmetry character of the second 3(-) and 4+ states. Comparison with sdg-IBM-2 model calculations.

doi: 10.1103/PhysRevC.90.051302
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Data from this article have been entered in the XUNDL database. For more information, click here.


2014HU12      Phys.Rev. C 90, 014304 (2014)

R.O.Hughes, C.W.Beausang, T.J.Ross, J.T.Burke, R.J.Casperson, N.Cooper, J.E.Escher, K.Gell, E.Good, P.Humby, M.McCleskey, A.Saastimoinen, T.D.Tarlow, I.J.Thompson

236Pu(n, f), 237Pu(n, f), and 238Pu(n, f) cross sections deduced from (p, t), (p, d), and (p, p') surrogate reactions

NUCLEAR REACTIONS 235U, 239Pu(p, t), (p, d), (p, p'), E=28.5 MeV; measured particle and γ spectra, (particle)γ-, (particle)(particle)-, (d)(fission)-coin, cross sections using STARLiTeR array at Texas A-M cyclotron facility. 232,233U, 236,237Pu(n, F), E=0.5-7.5 MeV; deduced σ(E) ratios. 238Pu(n, F), E=0.5-10.5 MeV; deduced σ(E) from (p, p') and σ for 234U(n, F) in ENDF/B-VII evaluation. Surrogate ratio method. Comparison with ENSDF/B-VII evaluations, and some previous experimental results.

doi: 10.1103/PhysRevC.90.014304
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14396.


2014RO25      Phys.Rev. C 90, 044323 (2014)

T.J.Ross, R.O.Hughes, J.M.Allmond, C.W.Beausang, C.T.Angell, M.S.Basunia, D.L.Bleuel, J.T.Burke, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.W.Phair, J.J.Ressler, N.D.Scielzo

Spectroscopy of 153Gd and 157Gd using the (p, dγ) reaction

NUCLEAR REACTIONS 154,158Gd(p, d), E=25 MeV; measured Eγ, Iγ, E(d), I(d), dγ-, dγγ-coin, d(θ) in coincidence with γ rays using STARS and LIBERACE arrays at LBNL cyclotron facility. 153,157Gd; deduced levels, J, π, L-transfers, Nilsson assignments. DWBA analysis of angular distribution data. Comparison with previous experimental results. Discussed residual effects of a neutron subshell closure at N=64.

doi: 10.1103/PhysRevC.90.044323
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2138. Data from this article have been entered in the XUNDL database. For more information, click here.


2013BU05      Phys.Rev. C 87, 044337 (2013), Pub.Note Phys.Rev. C 88, 019903 (2013)

M.Bunce, P.H.Regan, V.Werner, C.W.Beausang, V.Anagnostatou, M.Bowry, R.J.Casperson, D.Chen, N.Cooper, P.M.Goddard, R.O.Hughes, G.Ilie, P.J.R.Mason, B.Pauerstein, M.W.Reed, T.J.Ross, E.C.Simpson

High-spin study of the shell model nucleus 88Y49

NUCLEAR REACTIONS 74Ge(18O, 3np)60, E=60 MeV; 76Ge(18O, 5np), E=90 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO) using the YRAST ball at WNSL, Yale facility. 88Y; deduced high-spin levels, J, π, bands, configuration. Comparison with truncated valence space shell-model calculations.

NUCLEAR STRUCTURE 88Y; calculated levels, J, π, proton occupancy, configuration. Shell model using computer code NUSHELLX.

doi: 10.1103/PhysRevC.87.044337
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2013CR02      Phys.Rev.Lett. 110, 242701 (2013)

H.L.Crawford, R.M.Clark, P.Fallon, A.O.Macchiavelli, T.Baugher, D.Bazin, C.W.Beausang, J.S.Berryman, D.L.Bleuel, C.M.Campbell, M.Cromaz, G.de Angelis, A.Gade, R.O.Hughes, I.Y.Lee, S.M.Lenzi, F.Nowacki, S.Paschalis, M.Petri, A.Poves, A.Ratkiewicz, T.J.Ross, E.Sahin, D.Weisshaar, K.Wimmer, R.Winkler

Quadrupole Collectivity in Neutron-Rich Fe and Cr Isotopes

NUCLEAR REACTIONS Bi(66Fe, 66Fe'), (68Fe, 68Fe'), (64Cr, 64Cr'), E<130 MeV/nucleon; measured reaction products, Eγ, Iγ. 66,68Fe, 64Cr; deduced σ, B(E2). Comparison with state-of-the-art large-scale shell-model calculations within the full fpgd neutron orbital model space using the Lenzi-Nowacki-Poves-Sieja effective interaction.

doi: 10.1103/PhysRevLett.110.242701
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2013CZ01      Phys.Rev. C 87, 034613 (2013)

A.Czeszumska, C.T.Angell, J.T.Burke, N.D.Scielzo, E.B.Norman, R.A.E.Austin, G.Boutoux, R.J.Casperson, P.Chodash, R.O.Hughes, C.M.Mattoon, V.Meot, J.Munson, L.Phair, J.J.Ressler, O.Roig, T.J.Ross, E.Swanberg, B.Wang

Determining the 239Np(n, f) cross section using the surrogate ratio method

NUCLEAR REACTIONS 236,238U(3He, pF), E=29 MeV; measured proton, deuteron, triton, 3,4He spectra, fission events, fission anisotropies, particle-fission time-to-amplitude spectrum, (fission)p-coin using STARS array at LBNL cyclotron facility. 239Np(n, F), E=0.5-20 MeV; deduced cross section by surrogate ratio method. Comparison with ENDF/B-VII.0, JENDL-4.0, and CENDL-3.1 evaluated libraries. Impact on estimate of 240Pu produced during fuel burnup in calculations using reactor codes.

doi: 10.1103/PhysRevC.87.034613
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2013DO22      Phys.Rev.Lett. 111, 212502 (2013)

P.Doornenbal, H.Scheit, S.Takeuchi, N.Aoi, K.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, H.Crawford, C.R.Hoffman, R.Hughes, E.Ideguchi, N.Kobayashi, Y. Kondo, J.Lee, S.Michimasa, T.Motobayashi, H.Sakurai, M.Takechi, Y.Togano, R.Winkler, K.Yoneda

In-Beam γ-Ray Spectroscopy of 34, 36, 38Mg: Merging the N=20 and N=28 Shell Quenching

NUCLEAR REACTIONS Be(48Ca, X)37Al/39Al/40Si, E=345 MeV/nucleon; C(40Si, 38Mg), E=226 MeV/nucleon; C(39Al, 38Mg), E=219 MeV/nucleon; measured reaction products, Eγ, Iγ. 34,36,38Mg; deduced level energies, J, π, E(4+)/E(2+) ratios. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.111.212502
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2013DR01      Phys.Rev. C 87, 014326 (2013)

G.D.Dracoulis, G.J.Lane, H.Watanabe, R.O.Hughes, N.Palalani, F.G.Kondev, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, P.Chowdhury, W.Y.Liang, Y.Shi, F.R.Xu

Three-quasiparticle isomers and possible deformation in the transitional nuclide, 195Au

NUCLEAR REACTIONS 192Os(136Xe, X), E AP 6.0 MeV/nucleon; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(t), T1/2 using Gammasphere at ATLAS facility in ANL. 195Au; deduced high-spin levels, isomers, J, π, total conversion coefficients, multipolarity, B(E1), B(M1), B(E2), B(M2), configurations, bands. Calculated potential energy surfaces, 3qp configurations and deformation parameters, residual interactions from semi-empirical shell model. Systematics of level structures in N=116 isotones 192Os, 193Ir, 194Pt, 195Au, 196Hg.

doi: 10.1103/PhysRevC.87.014326
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2013DR05      Phys.Lett. B 720, 330 (2013)

G.D.Dracoulis, G.J.Lane, A.P.Byrne, H.Watanabe, R.O.Hughes, F.G.Kondev, M.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, P.Chowdhury, Y.Shi, F.R.Xu

Isomers and excitation modes in the gamma-soft nucleus 192Os

NUCLEAR REACTIONS 192Os, 186W(136Xe, X)192Os, E=6 MeV/nucleon; measured reaction products, Eγ, Iγ, γ-γ-γ-coin.; deduced high-spin states, J, π, long-lived isomer; Comparison with potential-energy-surfaces calculations.

doi: 10.1016/j.physletb.2013.02.026
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2013HU08      Phys.Rev. C 88, 014311 (2013)

R.O.Hughes, G.J.Lane, G.D.Dracoulis, A.P.Byrne, P.Nieminen, H.Watanabe, M.P.Carpenter, P.Chowdhury, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, D.Seweryniak, S.Zhu

Multiquasiparticle states in the neutron-rich nucleus 174Tm

NUCLEAR REACTIONS 175,176Lu, 174,176Yb(136Xe, X), E=820 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ), isomer half-lives by γ(t) and γγ(t) using Gammasphere array at ATLAS-ANL facility. 174Tm; deduced levels, J, K, π, rotational bands, configurations, multipolarity, B(E1), B(M1), B(E2), B(M2), B(E3), hindrance factors for γ transitions, rotational alignments, magnitudes of gK-gR and mixing ratio, two- and four-quasiparticle states, residual n-n interaction. Comparison with multiquasiparticle calculations.

NUCLEAR STRUCTURE 174Tm; calculated levels, J, K, π, configurations. Multiquasiparticle pairing calculations use the Lipkin-Nogami formalism; comparison with experimental data.

doi: 10.1103/PhysRevC.88.014311
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2013RO23      Phys.Rev. C 88, 031301 (2013)

T.J.Ross, R.O.Hughes, C.W.Beausang, J.M.Allmond, C.T.Angell, M.S.Basunia, D.L.Bleuel, J.T.Burke, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.W.Phair, J.J.Ressler, N.D.Scielzo

Remnants of spherical shell structures in deformed nuclei: The impact of an N=64 neutron subshell closure on the structure of N≈90 gadolinium nuclei

NUCLEAR REACTIONS 154,156,158Gd(p, d), E=25 MeV; measured deuteron and γ spectra, dγ-, γγ-coin, σ(θ) for deuterons using STARS and LIBERACE detector systems at LBNL facility. DWBA analysis of σ(θ) data. 153,155, 157Gd; deduced low-energy levels, J, π, Nilsson configurations, persistence of spherical shell structure.

doi: 10.1103/PhysRevC.88.031301
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2012BU18      J.Phys.:Conf.Ser. 381, 012068 (2012)

M.Bunce, P.H.Regan, V.Werner, V.Anagnostatou, C.W.Beausang, M.Bowry, R.J.Casperson, D.Chen, N.Cooper, P.Goddard, R.O.Hughes, G.Ilie, P.J.R.Mason, B.Pauerstein, M.W.Reed, T.J.Ross

A shell model study of the high spin states of 88Y

NUCLEAR REACTIONS 74Ge(18O, 3np), E=60, 65, 70 MeV;76Ge(18O, 5np), E=90 MeV; measured prompt, delayed Eγ, Iγ(θ), γγ-coin using YRAST ball detector array consisting of 10 Compton-suppressed HPGe and including Doppler shift corrections, γ polarization using Compton polarimeter; calculated σ, σ(l) using PACE4, levels, J, π using NuShell code. 88Y deduced levels, J, π, γ transitions.

doi: 10.1088/1742-6596/381/1/012068
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2012DR02      Phys.Lett. B 709, 59 (2012)

G.D.Dracoulis, G.J.Lane, A.P.Byrne, H.Watanabe, R.O.Hughes, N.Palalani, F.G.Kondev, M.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, P.Chowdhury, Y.Shi, F.R.Xu

Long-lived three-quasiparticle isomers in 191Ir and 193Ir with triaxial deformation

NUCLEAR REACTIONS 186W, 187Re, 192Os(126Xe, X)191Ir/193Ir, E=6 MeV/nucleon; measured reaction products, X-rays, Eγ, Iγ, γ-γ-coin.; deduced high-spin state energies, J, π, transition strengths, total conversion coefficients, triaxial shape, extreme isomerism. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2012.02.008
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2012DR11      J.Phys.:Conf.Ser. 381, 012060 (2012)

G.D.Dracoulis, G.J.Lane, A.P.Byrne, H.Watanabe, R.O.Hughes, N.Palalani, F.G.Kondev, M.P.Carpenter, D.Seweryniak, S.Zhu, R.V.F.Janssens, C.J.Lister, T.Lauritsen, P.Chowdhury, Y.Shi, F.R.Xu

Isomers and alignments in 191Ir and 192Os

NUCLEAR REACTIONS 186W, 192Os(136Xe, X), E=6.0 MeV/nucleon; measured Eγ, Iγ, γγ-coin, X-rays using Gammasphere. 191Ir, 192Os deduced levels, J, π, γ transitions, rotational bands, deformation, high-spin states, isomeric states, T1/2, net alignments. Compared with published 194Pt, 196Hg.

doi: 10.1088/1742-6596/381/1/012060
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2012HU01      Phys.Rev. C 85, 024613 (2012)

R.O.Hughes, C.W.Beausang, T.J.Ross, J.T.Burke, N.D.Scielzo, M.S.Basunia, C.M.Campbell, R.J.Casperson, H.L.Crawford, J.E.Escher, J.Munson, L.W.Phair, J.J.Ressler

Utilizing (p, d) and (p, t) reactions to obtain (n, f) cross sections in uranium nuclei via the surrogate-ratio method

NUCLEAR REACTIONS 236,238U(p, d), (p, t), E=28 MeV; measured E(d), I(d), E(t), I(t), fission spectra, (particle)(fission)-, (particle)γ-coin, fission fragment anisotropy ratios using STARS detector array at LBNL cyclotron facility; deduced σ[236U(n, F)]/σ[234U(n, F)], σ[235U(n, F)]/σ[233U(n, F)], σ[234U(n, F)]/σ[233U(n, F)], σ[236U(n, F)]/σ[235U(n, F)] reaction cross section ratios for E(n)=0-7 MeV. Surrogate-ratio method. Comparison with ENDF/B-VII evaluation.

doi: 10.1103/PhysRevC.85.024613
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2012HU10      Phys.Rev. C 86, 054314 (2012)

R.O.Hughes, G.J.Lane, G.D.Dracoulis, A.P.Byrne, P.H.Nieminen, H.Watanabe, M.P.Carpenter, P.Chowdhury, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, D.Seweryniak, S.Zhu

High-spin structure, K isomers, and state mixing in the neutron-rich isotopes 173Tm and 175Tm

NUCLEAR REACTIONS 174,176Yb, 175,176Lu(136Xe, X), E=820 MeV; measured Eγ, Iγ, γγ-coin, isomer half-lives by γγ(t) using Gammasphere array at ANL facility. 173,175Tm; deduced high-spin levels, isomers, J, π, bands, conversion coefficients, multipolarity, alignments, mixing ratios, gK-gR, B(EL), B(ML), hindrance factors, configurations. Comparison with multiquasiparticle calculations. Systematics of energies of multiquasiparticle states in N=104, 106 isotones 172,174Er, 173,175Tm, 174,176Yb, 175,177Lu. Mixing of high-K bands.

NUCLEAR STRUCTURE 173,175Tm; calculated levels, J, π, configurations. Multiquasiparticle calculations using single-particle energies from a Nilsson calculation and Lipkin-Nogami formalism for pairing correlations. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.054314
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2012HU14      J.Phys.:Conf.Ser. 381, 012064 (2012)

R.O.Hughes, C.W.Beausang, T.J.Ross, J.T.Burke, N.D.Scielzo, M.S.Basunia, C.M.Campbell, R.J.Casperson, H.L.Crawford, J.Munson, L.Phair, J.J.Ressler

To the continuum and beyond: Structure of U nuclei

NUCLEAR REACTIONS 236,238U(p, X), E=28 MeV; measured outgoing light ions using STARS Si telescope, (particle)(fission)-coin, Eγ, Iγ using Ge detectors of LIBERACE array, (particle)γ-coin; deduced σ(234U(n, f))/σ(236U(n, f)) ratio vs neutron energy using (p, dF) surrogate. 235,237U deduced levels, J, π, γ transitions.

doi: 10.1088/1742-6596/381/1/012064
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2012MC05      Phys.Rev. C 86, 057306 (2012)

E.A.McCutchan, C.J.Lister, M.Elvers, D.Savran, J.P.Greene, T.Ahmed, T.Ahn, N.Cooper, A.Heinz, R.O.Hughes, G.Ilie, B.Pauerstein, D.Radeck, N.Shenkov, V.Werner

Precise γ-ray intensity measurements in 10B

NUCLEAR REACTIONS 10B(p, p'), E=10 MeV; measured Eγ, Iγ, proton spectra, pγ-coin, at Yale tandem facility. 10B; deduced levels, γ-ray branching ratios, E2 branch from 5164-keV level, B(E2). Comparison with previous studies.

doi: 10.1103/PhysRevC.86.057306
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2012RO14      Phys.Rev. C 85, 051304 (2012)

T.J.Ross, C.W.Beausang, R.O.Hughes, J.M.Allmond, C.T.Angell, M.S.Basunia, D.L.Bleuel, J.T.Burke, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.Phair, J.J.Ressler, N.D.Scielzo, I.J.Thompson

Measurement of the entry-spin distribution imparted to the high excitation continuum region of gadolinium nuclei via (p, d) and (p, t) reactions

NUCLEAR REACTIONS 154,158Gd(p, d), (p, t), E=25 MeV; measured particle and γ spectra, pγ-, dγ-, tγ-coin, σ(θ) using STARS-LIBERACE array; deduced entry spin distribution for the highly excited quasicontinuum in light-ion transfer reactions. DWBA analysis of σ(θ) data. 153,156Gd; deduced levels, J, π, l-transfer.

doi: 10.1103/PhysRevC.85.051304
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2012RO42      Phys.Rev. C 86, 067301 (2012)

T.J.Ross, C.W.Beausang, R.O.Hughes, N.D.Scielzo, J.T.Burke, J.M.Allmond, C.T.Angell, M.S.Basunia, D.L.Bleuel, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.Phair, J.J.Ressler

Spectroscopy of 88Y by the (p, dγ) reaction

NUCLEAR REACTIONS 89Y(p, d), E=25 MeV; measured E(d), I(d), Eγ, Iγ, dγ-coin, yields using STARS array for deuterons and LIBERACE array for γ rays at LBNL cyclotron facility. 88Y; deduced levels, branching ratios. 89Y(p, p'), (p, p'n), E=25 MeV; measured Ep, Ip, pγ-coin.

doi: 10.1103/PhysRevC.86.067301
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2012TA20      Phys.Rev.Lett. 109, 182501 (2012)

S.Takeuchi, M.Matsushita, N.Aoi, P.Doornenbal, K.Li, T.Motobayashi, H.Scheit, D.Steppenbeck, H.Wang, H.Baba, D.Bazin, L.Caceres, H.Crawford, P.Fallon, R.Gernhauser, J.Gibelin, S.Go, S.Grevy, C.Hinke, C.R.Hoffman, R.Hughes, E.Ideguchi, D.Jenkins, N.Kobayashi, Y.Kondo, R.Krucken, T.Le Bleis, J.Lee, G.Lee, A.Matta, S.Michimasa, T.Nakamura, S.Ota, M.Petri, T.Sako, H.Sakurai, S.Shimoura, K.Steiger, K.Takahashi, M.Takechi, Y.Togano, R.Winkler, K.Yoneda

Well Developed Deformation in 42Si

NUCLEAR REACTIONS C(44S, 42Si), (40S, 38Si), E=210 MeV/nucleon; measured reaction products, Eγ, Iγ, γ-γ coin. 38,40,42Si; deduced energy levels, J, π, rapid deformation development of Si isotopes. Comparison with available data.

doi: 10.1103/PhysRevLett.109.182501
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2011BU11      J.Korean Phys.Soc. 59, 1892s (2011)

J.T.Burke, J.J.Ressler, J.E.Escher, N.D.Scielzo, I.J.Thompson, R.Henderson, J.Gostic, L.Bernstein, D.Bluel, M.Weideking, V.Meot, O.Roig, L.W.Phair, R.Hatarik, J.Munson, C.Angell, B.Goldblum, C.W.Beausang, T.Ross, R.Hughes, M.Aiche, G.Barreau, N.Cappelan, S.Czajkowski, B.Hass, B.Jurado, L.Mathieu, I.Companis

Experimental Approaches to Studying the Fission Process Using the Surrogate Reaction Technique

NUCLEAR REACTIONS 235,236U, 239Pu(α, α'), E=55 MeV; measured E(charged particle), I(charged particle), Eγ, Iγ(θ), γγ-coin, fission products using STARS (Silicon Telescope Array for Reaction Studies), LIBERACE, HYDRA; deduced σ 238Pu(n, F) below 20 MeV using surrogate reactions. Comparison with other data.

doi: 10.3938/jkps.59.1892
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2011RE09      Phys.Rev. C 83, 054610 (2011)

J.J.Ressler, J.T.Burke, J.E.Escher, C.T.Angell, M.S.Basunia, C.W.Beausang, L.A.Bernstein, D.L.Bleuel, R.J.Casperson, B.L.Goldblum, J.Gostic, R.Hatarik, R.Henderson, R.O.Hughes, J.Munson, L.W.Phair, T.J.Ross, N.D.Scielzo, E.Swanberg, I.J.Thompson, M.Wiedeking

Surrogate measurement of the 238Pu(n, f) cross section

NUCLEAR REACTIONS 239Pu(α, α'F), 235U(α, α'F), 236U(α, α'F), E=20-55 MeV; measured particle and fission fragment spectra, α-fission coincidences, cross sections, fission fragment anisotropy ratios. 238Pu, 234,235U(n, F), E=5-20 MeV; deduced fission cross sections using surrogate ratio method. Comparison with previous experimental data and evaluated libraries. Data needs for following reactions for next-generation reactors: 241Pu, 241,242Am, 243,244,245Cm(n, F), E.1 MeV. Potential surrogate and ratio reactions listed.

doi: 10.1103/PhysRevC.83.054610
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2010DR05      Phys.Rev. C 82, 034317 (2010)

G.D.Dracoulis, G.J.Lane, R.O.Hughes, F.G.Kondev, H.Watanabe, D.Seweryniak, S.Zhu, M.P.Carpenter, C.J.Chiara, R.V.F.Janssens, T.Lauritsen, C.J.Lister, E.A.McCutchan, I.Stefanescu, P.Chowdhury

Structure of three-quasiparticle isomers in 169Ho and 171Tm

NUCLEAR REACTIONS 170Er(136Xe, X), E=830 MeV; measured Eγ, Iγ, γγ-coin, delayed spectra, half-lives and branching ratios using Gammasphere array. 169Ho, 171Tm; deduced levels, J, π, isomer, transition strengths and hindrances, gK-gR values, bands and quasiparticle configurations.

doi: 10.1103/PhysRevC.82.034317
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2010LA16      Phys.Rev. C 82, 051304 (2010)

G.J.Lane, G.D.Dracoulis, F.G.Kondev, R.O.Hughes, H.Watanabe, A.P.Byrne, M.P.Carpenter, C.J.Chiara, P.Chowdhury, R.V.F.Janssens, T.Lauritsen, C.J.Lister, E.A.McCutchan, D.Seweryniak, I.Stefanescu, S.Zhu

Structure of neutron-rich tungsten nuclei and evidence for a 10- isomer in 190W

NUCLEAR REACTIONS 186W, 192Os(136Xe, X), E=840 MeV pulsed beam; measured Eγ, Iγ, prompt and delayed γ spectra, γγ-coin, γγ(t), half-lives. 188W, 190W; deduced levels, J, π, isomers, internal conversion coefficients, multipolarity, configurations, transition strengths, K-hindrances. 186,188,190W; systematics of calculated two-particle states.

doi: 10.1103/PhysRevC.82.051304
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2009LA17      Phys.Rev. C 80, 024321 (2009)

G.J.Lane, G.D.Dracoulis, A.P.Byrne, R.O.Hughes, H.Watanabe, F.G.Kondev, C.J.Chiara, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, E.A.McCutchan, D.Seweryniak, S.Zhu, P.Chowdhury, I.Stefanescu

Decay of a Kπ = 21/2-, 17-ms isomer in 185Ta

NUCLEAR REACTIONS 186W(136Xe, X)185Ta, E=840 MeV; measured Eγ, Iγ, γγ-coin and half-lives. 185Ta; deduced levels, J, π, isomer, mixing ratios, bands and configurations, transition rates and other rotational-model characteristics, K-allowed E1 and K-forbidden transitions.

doi: 10.1103/PhysRevC.80.024321
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2009WA02      Phys.Rev. C 79, 024306 (2009)

H.Watanabe, G.J.Lane, G.D.Dracoulis, T.Kibedi, A.P.Byrne, P.Nieminen, R.O.Hughes, F.G.Kondev, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, D.Seweryniak, S.Zhu, P.Chowdhury, C.-B.Moon

Decay properties of high-spin isomers and other structures in 121Sb and 123Sb

NUCLEAR REACTIONS Yb, Lu, W, Os(136Xe, X)121Sb/123Sb, E=6.0-6.2 MeV/nucleon; measured Eγ, γγ-coin, γ(t), half-lives; deduced isomers. 120Sn(7Li, 2nα), E=58 MeV; 122Sn(7Li, 2nα), E=54 MeV; measured Eγ, Iγ, γγ-coin, coversion electron spectra, half-lives by decay curve analyses and centroid-shift methods, angular correlations, DCO, conversion coefficients. 121,123Sb; deduced levels, J, π, multipolarity, mixing ratios, configurations. Comparisons with 120Sn and 122Sn and with multistate mixing calculations. 113,115,117,119,121,123,125,127,129,131,133Sb; systematics.

doi: 10.1103/PhysRevC.79.024306
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2008HU05      Phys.Rev. C 77, 044309 (2008)

R.O.Hughes, G.J.Lane, G.D.Dracoulis, T.Kibedi, P.Nieminen, H.Watanabe

Two-quasiparticle isomer, E1 hindrances and residual interactions in 172Tm

NUCLEAR REACTIONS 170Er(7Li, nα), E=30 MeV; measured Eγ, Iγ, γγ-coin, lifetime of 6+ isomer, B(E1), hindrance factors for γ-transitions. 172Tm; deduced levels, J, π, band configurations.

doi: 10.1103/PhysRevC.77.044309
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2007HA05      Phys.Rev. C 75, 034308 (2007)

A.B.Hayes, D.Cline, C.Y.Wu, H.Ai, H.Amro, C.Beausang, R.F.Casten, J.Gerl, A.A.Hecht, A.Heinz, H.Hua, R.Hughes, R.V.F.Janssens, C.J.Lister, A.O.Macchiavelli, D.A.Meyer, E.F.Moore, P.Napiorkowski, R.C.Pardo, Ch.Schlegel, D.Seweryniak, M.W.Simon, J.Srebrny, R.Teng, K.Vetter, H.J.Wollersheim

Spin dependence of K mixing, strong configuration mixing, and electromagnetic properties of 178Hf

NUCLEAR REACTIONS 178Hf(136Xe, 136Xe'), E=650 MeV; measured prompt and delayed Eγ, Iγ, γγ-, (particle)γ-coin following Coulomb excitation. Ta(178Hf, 178Hf'), E ≈ 700-850 MeV; measured isomer production σ. 178Hf deduced levels, J, π, rotational bands, transition matrix elements, K-mixing features. Gammasphere, Chico arrays.

doi: 10.1103/PhysRevC.75.034308
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2006DR04      Phys.Lett. B 635, 200 (2006)

G.D.Dracoulis, G.J.Lane, F.G.Kondev, A.P.Byrne, R.O.Hughes, P.Nieminen, H.Watanabe, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, D.Seweryniak, S.Zhu, P.Chowdhury, F.R.Xu

Two-quasiparticle K-isomers and pairing strengths in the neutron-rich isotopes 174Er and 172Er

NUCLEAR REACTIONS 176Yb(136Xe, X)174Er/172Er, E=6.0 MeV/nucleon; measured prompt and delayed Eγ, Iγ, γγ-coin. 172,174Er deduced high-spin levels, J, π, isomeric states, configurations. Gammasphere array, level systematics in neighboring isotones discussed.

NUCLEAR STRUCTURE 172,174Er, 174Yb, 176Hf, 178W, 180Os; calculated high-spin isomers energies; deduced pairing strength. Configuration-constrained potential-energy-surface calculations.

doi: 10.1016/j.physletb.2006.02.057
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2006HA04      Phys.Rev.Lett. 96, 042505 (2006)

A.B.Hayes, D.Cline, C.Y.Wu, J.Ai, H.Amro, C.Beausang, R.F.Casten, J.Gerl, A.A.Hecht, A.Heinz, R.Hughes, R.V.F.Janssens, C.J.Lister, A.O.Macchiavelli, D.A.Meyer, E.F.Moore, P.Napiorkowski, R.C.Pardo, Ch.Schlegel, D.Seweryniak, M.W.Simon, J.Srebrny, R.Teng, K.Vetter, H.J.Wollersheim

Breakdown of K Selection in 178Hf

NUCLEAR REACTIONS Ta(178Hf, 178Hf'), E≈ 700-850 MeV; measured delayed Eγ, Iγ following projectile Coulomb excitation; deduced isomer excitation function. 178Hf deduced transition matrix elements, K-mixing features.

RADIOACTIVITY 178mHf(IT) [from Coulomb excitation]; measured Eγ, Iγ. 178Hf deduced transition matrix elements, K-mixing features.

doi: 10.1103/PhysRevLett.96.042505
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2006MC02      Phys.Rev. C 73, 034303 (2006)

E.A.McCutchan, N.V.Zamfir, R.F.Casten, H.Ai, H.Amro, M.Babilon, D.S.Brenner, G.Gurdal, A.Heinz, R.O.Hughes, D.A.Meyer, C.Plettner, J.Qian, J.J.Ressler, N.J.Thomas, V.Werner, E.Williams, R.Winkler

Lifetime measurements of yrast states in 162Yb and 166Hf

NUCLEAR REACTIONS 116Cd(50Ti, 4n), E=200 MeV; 122Sn(48Ti, 4n), E=200 MeV; measured Doppler-shifted Eγ, Iγ, γγ-coin. 162Yb, 166Hf deduced levels T1/2, B(E2). Recoil-distance method, comparison with X(5) critical-point and IBA model predictions.

doi: 10.1103/PhysRevC.73.034303
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2005CH53      Nucl.Phys. A758, 126c (2005)

J.A.Church, L.Ahle, L.A.Bernstein, J.Cooper, F.S.Dietrich, J.Escher, C.Forssen, H.Ai, H.Amro, M.Babilon, C.Beausang, J.Caggiano, A.Heinz, R.Hughes, E.McCutchan, D.Meyer, C.Plettner, J.Ressler, V.Zamfir

Determining neutron capture cross sections with the Surrogate Reaction Technique: Measuring decay probabilities with STARS

NUCLEAR REACTIONS 92Zr(α, α'), (α, 3HeX), (α, tX), (α, dX), (α, pX), E=51 MeV; measured particle spectra. 92Zr(α, α'), (α, xnα), E=51 MeV; measured Eγ, Iγ, αγ-coin. 90,91,92Zr deduced transitions. Surrogate reaction technique.

doi: 10.1016/j.nuclphysa.2005.05.169
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2005HU08      Phys.Rev. C 71, 044311 (2005)

R.O.Hughes, N.V.Zamfir, D.C.Radford, C.J.Gross, C.J.Barton, C.Baktash, M.A.Caprio, R.F.Casten, A.Galindo-Uribarri, P.A.Hausladen, E.A.McCutchan, J.J.Ressler, D.Shapira, D.W.Stracener, C.-H.Yu

γ-ray spectroscopy of 132Te through β decay of a 132Sb radioactive beam

RADIOACTIVITY 132Sb(β-) [from U(p, F)]; measured Eγ, Iγ, γγ-coin. 132Te deduced levels, J, π. Clarion array, comparison with model predictions.

doi: 10.1103/PhysRevC.71.044311
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2005RE02      Phys.Rev. C 71, 014302 (2005)

J.J.Ressler, C.W.Beausang, H.Ai, H.Amro, M.Babilon, J.A.Caggiano, R.F.Casten, G.Gurdal, A.Heinz, R.O.Hughes, E.A.McCutchan, D.A.Meyer, C.Plettner, J.Qian, M.J.S.Sciacchitano, N.J.Thomas, E.Williams, N.V.Zamfir

Isomeric decay of 208Ra

NUCLEAR REACTIONS 182W(30Si, 4n), E=151 MeV; measured delayed Eγ, Iγ, (recoil)γ-coin. 208Ra deduced levels, J, π, isomeric state T1/2. 182,183,184,186W(30Si, X)210Ra/209Ra/208Ra/209Fr, E=151 MeV; measured delayed Eγ, Iγ, (recoil)γ-coin. 209Fr, 209,210Ra deduced transitions. Level systematics in neighboring nuclides discussed.

doi: 10.1103/PhysRevC.71.014302
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2005RE23      J.Phys.(London) G31, S1605 (2005)

J.J.Ressler, C.W.Beausang, R.F.Casten, N.V.Zamfir, H.Ai, H.Amro, M.Babilon, R.B.Cakirli, J.A.Caggiano, G.Gurdal, A.Heinz, R.O.Hughes, S.D.Langdown, E.A.McCutchan, D.A.Meyer, C.Plettner, J.Qian, P.H.Regan, M.J.S.Sciacchitano, N.J.Thomas, E.Williams, A.Yamamoto

Isomers and seniority in the trans-Pb nuclei

NUCLEAR REACTIONS 182,184W(30Si, 4n), E=148 MeV; measured delayed Eγ, Iγ, γγ-, (recoil)γ-coin. 208,210Ra deduced levels, J, π, isomers T1/2, B(E2). Mass separator.

doi: 10.1088/0954-3899/31/10/041
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2005ZA14      Eur.Phys.J. A 25, Supplement 1, 389 (2005)

N.V.Zamfir, R.O.Hughes, R.F.Casten, D.C.Radford, C.J.Barton, C.Baktash, M.A.Caprio, A.Galindo-Uribarri, C.J.Gross, P.A.Hausladen, E.A.McCutchan, J.J.Ressler, D.Shapira, D.W.Stracener, C.-H.Yu

132Te and single-particle density-dependent pairing

RADIOACTIVITY 132Sb(β-); measured Eγ, Iγ, γγ-coin. 132Te deduced levels, J, π. Comparisons with quasiparticle RPA calculations with density-dependent pairing. Clarion array.

doi: 10.1140/epjad/i2005-06-168-y
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2004CA42      Phys.Rev. C 70, 044312 (2004)

R.B.Cakirli, R.F.Casten, E.A.McCutchan, H.Ai, H.Amro, M.Babilon, C.W.Beausang, A.Heinz, R.O.Hughes, D.A.Meyer, C.Plettner, J.J.Ressler, N.V.Zamfir

Breakdown of vibrational structure in 98Ru

NUCLEAR REACTIONS 96Mo(α, 2n), E=24, 26, 28, 30 MeV; measured Eγ, Iγ, γγ-coin. 98Ru deduced levels, J, π, breakdown of vibrational structure.

doi: 10.1103/PhysRevC.70.044312
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2004HU08      Phys.Rev. C 69, 051303 (2004)

R.O.Hughes, N.V.Zamfir, R.F.Casten, D.C.Radford, C.J.Barton, C.Baktash, M.A.Caprio, A.Galindo-Uribarri, C.J.Gross, P.A.Hausladen, E.A.McCutchan, J.J.Ressler, D.Shapira, D.W.Stracener, C.-H.Yu

Test of calculations with single-particle density dependent pairing in 132Te

RADIOACTIVITY 132Sb(β-); measured Eγ, Iγ, γγ-coin. 132Te deduced levels, J, π. Comparisons with quasiparticle RPA calculations with density-dependent pairing.

doi: 10.1103/PhysRevC.69.051303
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1987WA18      J.Phys.(London) G13, L207 (1987)

R.Wadsworth, A.Kirwan, D.J.G.Love, Y.-X.Luo, J.-Q.Zhong, P.J.Nolan, P.J.Bishop, M.J.Godfrey, R.Hughes, A.N.James, I.Jenkins, S.M.Mullins, J.Simpson, D.J.Thornley, K.L.Ying

The New Spectroscopy of Superdeformed States: Systematics in the light rare earths and unexpected feeding patterns

NUCLEAR REACTIONS 104Pd(32S, 2n2p), (32S, n2p), E=152 MeV; 104Ru(34S, 4n), (34S, 3n), E=155 MeV; 104Ru(36S, 4n), (36S, 3n), E=150 MeV; 104Ru(34S, 4np), E=162 MeV; 106Pd(34S, 4np), (34S, 4n), E=152 MeV; 100Mo(36S, 4n), E=150 MeV; measured Eγ, Iγ, γγ-coin. 132Ce, 133,134,135,137Nd deduced transitions, feeding level J, π, dynamical moments of inertia, superdeformed bands.

doi: 10.1088/0305-4616/13/9/007
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1976HU08      Nucl.Phys. A267, 329 (1976)

R.J.Hughes, A.Zieger, H.Waffler, B.Ziegler

The Photodisintegration of Deuterium at 0° for the Outgoing Protons

NUCLEAR REACTIONS 2H(γ, p), E=20-120 MeV; measured absolute σ.

doi: 10.1016/0375-9474(76)90664-3
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1975HU03      Nucl.Phys. A238, 189 (1975)

R.J.Hughes, R.H.Sambell, E.G.Muirhead, B.M.Spicer

The Photoneutron Cross Section of 9Be

NUCLEAR REACTIONS 9Be(γ, xn), E < 28 MeV; measured neutron yields; deduced total, integrated σ. 9Be deduced resonances.

doi: 10.1016/0375-9474(75)90348-6
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1973HU09      Nucl.Phys. A215, 147 (1973)

R.J.Hughes, E.G.Muirhead

The Photoneutron Cross Sections of 10B and 11B

NUCLEAR REACTIONS 10B(γ, nX), 11B(γ, nX), E < 28 MeV; measured yield curves, deduced σ, integrated σ.

doi: 10.1016/0375-9474(73)90107-3
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1961HU09      J.Opt.SocAm. 51, 696 (1961); Nuclear Sci.Abstr. 15, 2586, Abstr.20007 (1961)

R.H.Hughes, W.A.Hilton, F.A.Sharpton


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Note: The following list of authors and aliases matches the search parameter R.Hughes: , R.G.HUGHES, R.H.HUGHES, R.J.HUGHES, R.O.HUGHES