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NSR database version of April 11, 2024.

Search: Author = P.Copp

Found 37 matches.

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2024LA01      Phys.Rev. C 109, 024309 (2024)

S.Lalkovski, F.G.Kondev, K.Auranen, A.D.Ayangeakaa, M.P.Carpenter, J.A.Clark, P.Copp, N.P.Giha, D.J.Hartley, T.Lauritsen, S.Marley, G.E.Morgan, C.Muller-Gatermann, S.Nandi, W.Reviol, D.Santiago-Gonzalez, G.Savard, D.Seweryniak, Ir.B.Vasilev, J.Wu

Structure of the high-spin, β-decaying state in the neutron-rich nucleus 146La

doi: 10.1103/PhysRevC.109.024309
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2023AN09      Phys.Rev. C 108, 034303 (2023)

A.N.Andreyev, D.Seweryniak, B.Andel, S.Antalic, D.T.Doherty, A.Korichi, C.Barton, L.Canete, M.P.Carpenter, R.M.Clark, P.A.Copp, J.G.Cubiss, J.Heery, Y.Hrabar, H.Huang, T.Huang, V.Karayonchev, F.G.Kondev, T.Lauritsen, Z.Liu, G.Lotay, C.Muller-Gatermann, S.Nandi, C.Page, D.H.Potterveld, P.H.Regan, W.Reviol, D.Rudolph, M.Siciliano, R.S.Sidhu, A.Sitarcik, P.J.Woods, Z.Yue, W.Zhang

α decay of the neutron-deficient isotope 190At

doi: 10.1103/PhysRevC.108.034303
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2023HA30      Phys.Rev. C 108, 024307 (2023)

D.J.Hartley, F.G.Kondev, M.P.Carpenter, J.A.Clark, P.Copp, B.Kay, T.Lauritsen, G.Savard, D.Seweryniak, G.L.Wilson, J.Wu

First b--decay spectroscopy study of 157Nd

RADIOACTIVITY 157Nd(β-)[from 252Cf(SF)]; measured Eγ, Iγ, Eβ, Iβ, βγ-coin, βγγ-coin; deduced T1/2, logft, branchings, β-feedings. 157Pm; deduced levels, J, π, configurations. Systematics of relative energies of quasiproton orbitals observed in promethium, europium, and terbium N =90, 92, 94, and 96 nuclei - 151Pm, 153Pm, 155Pm, 157Pm, 153Eu, 155Pm, 157Pm, 159Pm, 155Tb, 157Tb, 159Tb, 161Tb. Separated A=157 beam from CARIBU source delivered to the SATURN moving tape collection system, which was surrounded by X-Array spectrometer comprised of 5 germanium clover detectors plastic scintillators.

doi: 10.1103/PhysRevC.108.024307
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2023KE08      Phys.Rev. C 108, 014603 (2023)

K.J.Kelly, M.Devlin, J.M.O'Donnell, E.A.Bennett, M.Paris, P.A.Copp

Measurement of the cross section of the Q = 4.4398 MeV 12C(n, n'γ) reaction from threshold to 16.5 MeV using γ and correlated n-γ detection

NUCLEAR REACTIONS 12C(n, n'γ), E=4.5-16.5 MeV; measured Eγ, Iγ, En, Iν, nγ-coin; deduced σ(E). Comparison to other experimental data and evaluated values from ENDF/B-VIII.0. Correlated Gamma-Neutron Array for Scattering (CoGNAC) consisting of 54-element EJ-309 liquid scintillator array at Weapons Neutron Research (WNR) facility (LANSCE, LANL).

doi: 10.1103/PhysRevC.108.014603
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2023SE09      Phys.Rev. C 107, L061302 (2023)

D.Seweryniak, T.Huang, K.Auranen, A.D.Ayangeakaa, B.B.Back, M.P.Carpenter, P.Chowdhury, R.M.Clark, P.A.Copp, Z.Favier, K.Hauschild, X.-T.He, T.L.Khoo, F.G.Kondev, A.Korichi, T.Lauritsen, J.Li, C.Morse, D.H.Potterveld, G.Savard, S.Stolze, J.Wu, J.Zhang, Y.-F.Xu

Nuclear rotation at the fission limit in 254Rf

NUCLEAR REACTIONS 206Pb(50Ti, 2n)254Rf, E=244 MeV from the ATLAS-ANL facility; measured reaction products, prompt γ rays, Eγ, Iγ, Rf Kα and Kβ x-rays, (254Rf implants)γ-coin, (implants)(fission events)γ-coin using the Gammasphere array and the Argonne gas-filled analyzer (AGFA). 254Rf; deduced levels, J, π, ground-state rotational band up to 14+, kinematic moment of inertia. Systematics of ground-state bands in 250Fm, 252,254No, and 254,256Rf, and comparison with particle-number conserving cranked shell model (PNC-CSM) calculations.

doi: 10.1103/PhysRevC.107.L061302
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2022CH09      Phys.Rev. C 105, 024319 (2022)

A.Chester, B.A.Brown, S.P.Burcher, M.P.Carpenter, J.J.Carroll, C.J.Chiara, P.A.Copp, B.P.Crider, J.T.Harke, D.E.M.Hoff, K.Kolos, S.N.Liddick, B.Longfellow, M.J.Mogannam, T.H.Ogunbeku, C.J.Prokop, D.Rhodes, A.L.Richard, O.A.Shehu, A.S.Tamashiro, R.Unz, Y.Xiao

Half-life measurement of the 199-keV isomeric state in 76Ga

RADIOACTIVITY 76Zn(β-)[from 76Cu β- formed in 9Be(86Kr, X), E=140 MeV/nucleon]; 76Ga(IT)[from 76Zn(β-)]; measured Eβ, Iβ, Eγ, Iγ, βγ-coin. 76Ga; deduced levels J, π, transition strength, T1/2 of the 199-keV isomeric transition from time difference between pulses produced by β-decay populating the isomeric state and γ from the decay of the isomer. Systematics of low-lying levels in 72,74,76,78,80Ga. Beam implantation in CeBr detector (NSCL-MSU ).

NUCLEAR STRUCTURE 76Ga; calculated levels, J, π, transition strength. Shell model calculations in the jj44 model space with the jun45, jj44b, and jj44c Hamiltonians.

doi: 10.1103/PhysRevC.105.024319
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2022HU09      Phys.Lett. B 833, 137345 (2022)

H.Huang, W.Q.Zhang, A.N.Andreyev, Z.Liu, D.Seweryniak, Z.H.Li, C.Y.Guo, A.E.Barzakh, P.Van Duppen, B.Andel, S.Antalic, M.Block, A.Bronis, M.P.Carpenter, P.Copp, J.G.Cubiss, B.Ding, D.T.Doherty, Z.Favier, F.Giacoppo, T.H.Huang, B.Kindler, F.G.Kondev, T.Lauritsen, J.G.Li, G.S.Li, B.Lommel, H.Y.Lu, M.Al Monthery, P.Mosat, Y.F.Niu, C.Raison, W.Reviol, G.Savard, S.Stolze, G.L.Wilson, H.Y.Wu, Z.H.Wang, F.R.Xu, Q.B.Zeng, X.H.Yu, F.F.Zeng, X.H.Zhou

First observation of the decay of the 13/2+ isomer in 183Hg and B(M2) systematics of neutron transitions across the nuclear chart

RADIOACTIVITY 183Hg(α) [from 187Pb α decay]; 187mPb(α) [from 142Nd(50Cr, 3n2pγ), E=255 MeV, followed by separation of fragments using Argonne gas-filled analyzer (AGFA) at the ATLAS-ANL facility]; measured reaction products, evaporation residues (EVRs), Eα, Iα, (EVR)α-correlations, αγ(t), Eγ, Iγ, x rays, T1/2 using double-sided silicon strip detector (DSSD), and four HPGe clover detectors. 183,183mHg; deduced levels, isomer, J, π, T1/2 of g.s. and isomer, α branching ratio, K-conversion coefficient, multipolarity, B(M2), Nilsson configurations. 187mPb; deduced T1/2. Systematics of decay schemes of 13/2+ isomers in 175,177,179,181,183,185Hg. Systematics of B(M2) values for 7/2-, 9/2+, 11/2- and 13/2+ isomers in even-Z, odd-N nuclei: 25Mg, 33Si, 33,35S, 37Ar, 39Ca, 59Cr, 61Fe, 63,67Ni, 63,65,67Zn, 67,69,71Ge, 69,71Se, 97,99Mo, 99,101,103Ru, 103,105Pd, 107,109Cd, 109,111,113,115Sn, 153Yb, 161Hf, 163W, 163Os, 171,189,191Pt, 181,183,201,203,205Hg, 209Pb, 205,207,211Po, 207,209,213Rn, 209,211Ra, 211,213Th.

doi: 10.1016/j.physletb.2022.137345
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2022HU21      Phys.Rev. C 106, L061301 (2022)

T.Huang, D.Seweryniak, B.B.Back, P.C.Bender, M.P.Carpenter, P.Chowdhury, R.M.Clark, P.A.Copp, X.-T.He, R.D.Herzberg, D.E.M.Hoff, H.Jayatissa, T.L.Khoo, F.G.Kondev, G.Morgan, C.Morse, A.Korichi, T.Lauritsen, C.Muller-Gatermann, D.H.Potterveld, W.Reviol, A.M.Rogers, S.Saha, G.Savard, K.Sharma, S.Stolze, S.Waniganeththi, G.L.Wilson, J.Wu, Y.-F.Xu, S.Zhu

Discovery of the new isotope 251Lr: Impact of the hexacontetrapole deformation on single-proton orbital energies near the Z=100 deformed shell gap

NUCLEAR REACTIONS 203Tl(50Ti, 2n)251Lr, 205Tl(50Ti, 2n)253Lr, E=237 MeV; measured reaction products, α-decay of the reaction products, Eα, Iα. 251,253Lr; deduced levels J, π, α-decay width. 251,253,255Lr; calculated single-proton levels near the Fermi surface. Calculations with particle-number conserving cranked shell model. Beam delivered to target by ATLAS linear accelerator and recoiling reaction products were separated in the Argonne Gas-Filled Analyzer (AGFA) at (ANL). Decay of the implanted reaction products was measured in pixelized double-sided Si strip detector (DSSD).

RADIOACTIVITY 251,253Lr(α)[from 203,205Tl(50Ti, 2n), E=237 MeV]; measured Eα, Iα; deduced T1/2, Q-value, α-decay branchings and widths. Comparison to other experimental data. and predictions of theoretical models.

doi: 10.1103/PhysRevC.106.L061301
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2022MA65      Phys.Rev. C 106, 064326 (2022)

A.Mattera, E.A.McCutchan, S.Zhu, C.Morse, M.P.Carpenter, P.Copp, C.Muller-Gatermann, W.Reviol, J.P.Greene, M.Gott

Decay spectroscopy of the blocked fission product 130I

RADIOACTIVITY 130I(β-)[from 130Te(p, n), E=7.5 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ). 130Xe; deduced levels, J, π, δ, transition intensities, γγ-angular correlations. Uncertainty of the strongest transition improved by a factor 2. Comparison to other experimental data. Measurement with Gammasphere array consisted of 49 Compton-suppressed HPGe detectors (ANL). Source was produced by irradiation at the Brookhaven Tandem Van de Graaff facility. Estimated source strength was around 11 μCi.

doi: 10.1103/PhysRevC.106.064326
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2022SA20      Phys.Lett. B 829, 137059 (2022)

M.Saxena, W.-J.Ong, Z.Meisel, D.E.M.Hoff, N.Smirnova, P.C.Bender, S.P.Burcher, M.P.Carpenter, J.J.Carroll, A.Chester, C.J.Chiara, R.Conaway, P.A.Copp, B.P.Crider, J.Derkin, A.Estrae, G.Hamad, J.T.Harke, R.Jain, H.Jayatissa, S.N.Liddick, B.Longfellow, M.Mogannam, F.Montes, N.Nepal, T.H.Ogunbeku, A.L.Richard, H.Schatz, D.Soltesz, S.K.Subedi, I.Sultana, A.S.Tamashiro, V.Tripathi, Y.Xiao, R.Zink

57Zn β-delayed proton emission establishes the 56Ni rp-process waiting point bypass

RADIOACTIVITY 57Zn(β+p), (β+) [from 9Be(78Kr, X)57Zn, E=150 MeV/nucleon]; measured decay products, Eγ, Iγ, Eβ, Iβ, Ep, Ip; deduced T1/2, βp branching ratio, β-γ-p decay mode transitions. The Coupled Cyclotron Facility of NSCL.

doi: 10.1016/j.physletb.2022.137059
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2022TA07      Phys.Rev. C 105, 064307 (2022)

T.L.Tang, C.R.Hoffman, B.P.Kay, I.A.Tolstukhin, S.Almaraz-Calderon, B.W.Asher, M.L.Avila, Y.Ayyad, K.W.Brown, D.Bazin, J.Chen, K.A.Chipps, P.A.Copp, M.Hall, H.Jayatissa, H.J.Ong, D.Santiago-Gonzalez, D.K.Sharp, J.Song, S.Stolze, G.L.Wilson, J.Wu

Experimental study of the isomeric state in 16N using the 16Ng, m(d, 3He) reaction

NUCLEAR REACTIONS 2H(16N, 3He), (16mN, 3He), E=11.8 MeV/nucleon, [secondary 16N mixed beam of ground state and the isomeric state produced in 2H(15N, 16N) primary reaction at ATLAS-ANL facility]; measured reaction products, 3He spectra, (recoils)(3He)-coin, angular distributions using HELIOS spectrometer. 15C; deduced levels, J, π, spectroscopic factors, DWBA calculations. 16mN; deduced neutron-halo of the isomeric state. Comparison with Woods-Saxon potential model calculations.

doi: 10.1103/PhysRevC.105.064307
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2772. Data from this article have been entered in the XUNDL database. For more information, click here.


2022ZH22      Phys.Lett. B 829, 137129 (2022)

W.Q.Zhang, A.N.Andreyev, Z.Liu, D.Seweryniak, H.Huang, Z.H.Li, J.G.Li, C.Y.Guo, D.T.Doherty, A.E.Barzakh, P.Van Duppen, J.G.Cubiss, B.Andel, S.Antalic, M.Block, A.Bronis, M.P.Carpenter, P.Copp, B.Ding, Z.Favier, F.Giacoppo, T.H.Huang, X.H.Yu, B.Kindler, F.G.Kondev, T.Lauritsen, G.S.Li, B.Lommel, H.Y.Lu, M.Al Monthery, P.Mosat, Y.F.Niu, C.Raison, W.Reviol, G.Savard, S.Stolze, G.L.Wilson, H.Y.Wu, Z.H.Wang, F.R.Xu, Q.B.Zeng, X.H.Zhou

First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic 187Pb

NUCLEAR REACTIONS 142Nd(50Cr, 3n2p)187Pb, E=255 MeV beam from ATLAS-ANL facility, followed by separation of evaporation residues (EVRs) using Argonne Gas-Filled Analyzer; measured Eα, Eγ, Iγ, x rays, αγ-coin, γγ-coin, T1/2 of a new low-energy microsec-isomer by αγ(t) using Gammasphere for γ detection and double-sided silicon strip detector (DSSD) for EVRs and α particles. Recoil-decay tagging (RDT) and isomer-decay tagging (IDT) methods. 187Pb; deduced high-spin levels, J, π, isomer, K-conversion coefficient, multipolarity, bands, B(E2), B(M1)/B(E2), triple-shape coexistence at low energy. Comparison with band structure in 185Hg. Systematics of aligned angular momenta plots and experimental Routhians for bands in 183,185Hg, 187Pb. 184Hg, 186Pb, 187Tl; observed γ rays. 186,187m,188Pb; observed α-decay peaks.

doi: 10.1016/j.physletb.2022.137129
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2022ZH46      Phys.Rev. C 106, 024317 (2022)

W.Q.Zhang, A.N.Andreyev, Z.Liu, D.Seweryniak, H.Huang, Z.H.Li, J.G.Li, C.Y.Guo, A.E.Barzakh, P.Van Duppen, M.Al Monthery, B.Andel, S.Antalic, M.Block, A.Bronis, M.P.Carpenter, P.Copp, J.G.Cubiss, B.Ding, D.T.Doherty, Z.Favier, F.Giacoppo, T.H.Huang, B.Kindler, F.G.Kondev, T.Lauritsen, G.S.Li, B.Lommel, H.Y.Lu, P.Mosat, Y.F.Niu, C.Raison, W.Reviol, G.Savard, S.Stolze, G.L.Wilson, H.Y.Wu, Z.H.Wang, F.R.Xu, X.H.Yu, Q.B.Zeng, X.H.Zhou

Identification of excited states in 188Bi and 188Po

NUCLEAR REACTIONS 142Nd(50Cr, 3np)188Bi, (50Cr, 4n)188Po, E=255 MeV; measured evaporation residues (EVRs), Eα, Eγ, Iγ, x rays, (EVR)γ-coin, αγ-coin, γγ-coin, using four clover HPGe detectors, Gammasphere array with 64 Compton-suppressed HPGe detectors, and DSSD and DSSD+Sibox at the ATLAS-ANL accelerator facility. 186,187,187m,188Pb, 189,189mBi; deduced recoil-decay tagging (RDT) γ-ray yields. 188Bi; deduced levels, J, π, isomer, T1/2 and decay modes of isomer, K-conversion coefficients, multipolarities, configurations. 188Po; deduced energy of the first 2+ level. 186Pb; deduced levels, J, π. 183,184,186Hg, 186,187,187m,188Pb, 188,189,189mBi; observed Eα. Systematics of 9/2-, 1/2+, 7/2- and 13/2+ level energies in 185,187,189,191,193,195Bi, and those of first 2+, 4+, 6+ and 8+, second 0+, 2+ and 4+ in 188,190,192,194,196,198,200,202,204,206,208,210Po.

doi: 10.1103/PhysRevC.106.024317
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2021CH56      Phys.Rev. C 104, 054314 (2021)

A.Chester, B.A.Brown, S.P.Burcher, M.P.Carpenter, J.J.Carroll, C.J.Chiara, P.A.Copp, B.P.Crider, J.T.Harke, D.E.M.Hoff, K.Kolos, S.N.Liddick, B.Longfellow, M.J.Mogannam, T.H.Ogunbeku, C.J.Prokop, D.Rhodes, A.L.Richard, O.A.Shehu, A.S.Tamashiro, R.Unz, Y.Xiao

Identification of a new isomeric state in 76Zn following the β decay of 76Cu

RADIOACTIVITY 76Cu(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon, followed by separation of fragments of interest using A1900 fragment separator at NSCL-MSU facility]; measured reaction products, particle identification plot of ions implanted in CeBr3 detector, Eγ, Iγ, (76Cu implants)γ-coin, γγ-coin, T1/2 of a nanosecond isomer by fast timing method using an array of 16 HPGe clover detectors and 15 LaBr3 detectors. 76Zn; deduced levels, J, π, new isomer, Comparison with shell-model calculations.

NUCLEAR STRUCTURE 76Zn; calculated levels, J, π, level T1/2, isomers, proton and neutron occupancy numbers of negative-parity isomeric states using shell model with jj4b, jj4c and JUN45 interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.054314
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2021KO09      Nucl.Instrum.Methods Phys.Res. A1000, 165240 (2021)

K.Kolos, A.M.Hennessy, N.D.Scielzo, V.E.Iacob, J.C.Hardy, M.A.Stoyer, A.P.Tonchev, W.-J.Ong, M.T.Burkey, B.Champine, J.A.Clark, P.Copp, A.Gallant, E.B.Norman, R.Orford, H.I.Park, J.Rohrer, D.Santiago-Gonzalez, G.Savard, A.J.Shaka, B.S.Wang, S.Zhu

New approach to precisely measure γ-ray intensities for long-lived fission products, with results for the decay of 95Zr

RADIOACTIVITY 95Zr, 95Nb, 95Sr, 95Y(β-); measured decay products, Eγ, Iγ, Eβ, Iβ, β-γ-coin.; deduced γ-ray energies and intensities, β-branching ratios. Comparison with a Monte Carlo decay code simulations. CARIBU facility, the reactor facility at TAMU.

doi: 10.1016/j.nima.2021.165240
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2021MI07      Phys.Rev. C 103, 024323 (2021)

A.J.Mitchell, R.Orford, G.J.Lane, C.J.Lister, P.Copp, J.A.Clark, G.Savard, J.M.Allmond, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, P.Chowdhury, D.A.Gorelov, R.V.F.Janssens, F.G.Kondev, U.Patel, D.Seweryniak, M.L.Smith, Y.Y.Zhong, S.Zhu

Ground-state and decay properties of neutron-rich 106Nb

RADIOACTIVITY 106Nb(β-)[from 252Cf(SF), CARIBU radioactive-ion-beam facility at ANL, followed by mass separation and measurement using Multi-Reflection Time-of-Flight (MR-TOF) mass separator and Canadian Penning Trap (CPT)]; measured CPT spectra, Eγ, Iγ, βγγ-coin, half-life of 106Nb decay using five HPGe clover detectors, and a plastic scintillator at the X-Array and SATURN decay-spectroscopy station. 106Mo; deduced levels, J, π, apparent β feedings, range of logft values, configurations. 106Nb; discussed spin, parity and configurations of the ground state. Comparison with earlier experimental results.

ATOMIC MASSES 106Nb; measured cyclotron frequency using the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique, CPT spectra; deduced mass excess. Comparison with previous measurement, and with AME 2016 evaluation.

doi: 10.1103/PhysRevC.103.024323
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2020DE18      Eur.Phys.J. A 56, 150 (2020)

V.V.Desai, W.Loveland, R.Yanez, G.Lane, S.Zhu, A.D.Ayangekaa, J.P.Greene, F.G.Kondev, R.V.F.Janssens, P.A.Copp

The 136Xe + 198Pt reaction: a detailed re-examination

doi: 10.1140/epja/s10050-020-00154-4
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2020HA13      Phys.Rev. C 101, 044301 (2020)

D.J.Hartley, F.G.Kondev, G.Savard, J.A.Clark, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, P.Copp, K.Hicks, C.R.Hoffman, R.V.F.Janssens, T.Lauritsen, R.Orford, J.Sethi, S.Zhu

High-K, two-quasiparticle states in 160Gd

RADIOACTIVITY 160,160mEu(β-)[from 252Cf(SF), isobarically separated A=160 nuclei using the CARIBU source at Argonne National Laboratory]; measured β-, Eγ, Iγ, βγ- and βγγ-coin using four Ge clover detectors and four plastic scintillators. 160Gd; deduced levels, J, π, Kπ, bands, Nilsson configurations, total conversion coefficients and multipolarities of the 98.8- and 102.7-keV transitions, Iβ and logft. Comparison with previous experimental results, and with multiquasiparticle calculations using Woods-Saxon potential, and Lipkin-Nogami prescription for pairing.

doi: 10.1103/PhysRevC.101.044301
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2020SE02      Phys.Rev.Lett. 124, 052501 (2020)

N.Sensharma, U.Garg, Q.B.Chen, S.Frauendorf, D.P.Burdette, J.L.Cozzi, K.B.Howard, S.Zhu, M.P.Carpenter, P.Copp, F.G.Kondev, T.Lauritsen, J.Li, D.Seweryniak, J.Wu, A.D.Ayangeakaa, D.J.Hartley, R.V.F.Janssens, A.M.Forney, W.B.Walters, S.S.Ghugre, R.Palit

Longitudinal Wobbling Motion in 187Au

NUCLEAR REACTIONS 174Yb(19F, X)187Au, E=105, 115 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π, yrast band, B(M1)/B(E2). Comparison with PRM calculations.

doi: 10.1103/PhysRevLett.124.052501
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2019AU02      Phys.Lett. B 792, 187 (2019)

K.Auranen, D.Seweryniak, M.Albers, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, C.J.Chiara, P.Copp, H.M.David, D.T.Doherty, J.Harker, C.R.Hoffman, R.V.F.Janssens, T.L.Khoo, S.A.Kuvin, T.Lauritsen, G.Lotay, A.M.Rogers, C.Scholey, J.Sethi, R.Talwar, W.B.Walters, P.J.Woods, S.Zhu

Proton decay of 108I and its significance for the termination of the astrophysical rp-process

RADIOACTIVITY 108I(α), (p), 109I(p), 107,108Te(α) [from 54Fe(58Ni, X)108I/109I/108Te/107Te, E=254 MeV]; measured Eα, Iα, Ep, Ip; deduced Q-values, T1/2, mass excesses, branching ratio. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2019.03.039
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2019DE15      Phys.Rev. C 99, 044604 (2019)

V.V.Desai, W.Loveland, K.McCaleb, R.Yanez, G.Lane, S.S.Hota, M.W.Reed, H.Watanabe, S.Zhu, K.Auranen, A.D.Ayangeakaa, M.P.Carpenter, J.P.Greene, F.G.Kondev, D.Seweryniak, R.V.F.Janssens, P.A.Copp

The 136Xe + 198Pt reaction: A test of models of multi-nucleon transfer reactions

NUCLEAR REACTIONS 198Pt(136Xe, X)43K/69mZn/72Zn/72As/73Ga/96Nb/97Zr/99Mo/99mTc/105Rh/110In/112Pd/115mIn/120mSb/122Sb/124I/125Xe/126Sb/127Sb/127Xe/127Cs/128Sb/130I/132I/131mTe/131Ba/132I/132Cs/133I/133mXe/135I/135Xe/135mBa/136Cs/140Ba/140La/142Pr/143Ce/153Sm/154Tb/157Dy/169Lu/173Hf/175Hf/176Ta/177Ta/180mHf/181Re/182Re/182Os/183Os/184Ta/188Re/188Ir/189Re/190Ir/191Pt/193Au/194Ir/194Au/195mIr/195mPt/195mHg/196mIr/196mAu/197Hg/198Au/199Au/200mAu/200Tl/200Pb/201Tl/201Pb/202Tl/202mPb/203Hg/203Pb/204Bi, E=760.5 MeV; measured Eγ, Iγ, cumulative and independent yields and σ of projectile-like, fission and target-like fragments using Gammasphere array for online γ detection and an HPGe detector for offline γ spectroscopy at ATLAS-ANL facility. Comparison with predictions of GRAZING, di-nuclear systems (DNS), and improved quantum molecular dynamics (ImQMD) models for multi-nucleon transfer reactions, and with previous experimental results.

doi: 10.1103/PhysRevC.99.044604
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2019GA29      Phys.Rev. C 100, 044309 (2019)

E.R.Gamba, A.M.Bruce, S.Lalkovski, M.Rudigier, S.Bottoni, M.P.Carpenter, S.Zhu, J.T.Anderson, A.D.Ayangeakaa, T.A.Berry, I.Burrows, M.Carmona-Gallardo, R.J.Carroll, P.Copp, D.M.Cullen, T.Daniel, G.Fernandez-Martinez, J.P.Greene, L.A.Gurgi, D.J.Hartley, R.Ilieva, S.Ilieva, F.G.Kondev, T.Kroll, G.J.Lane, T.Lauritsen, I.Lazarus, G.Lotay, C.R.Nita, Zs.Podolyak, V.Pucknell, M.Reed, P.H.Regan, J.Rohrer, J.Sethi, D.Seweryniak, C.M.Shand, J.Simpson, M.Smolen, E.A.Stefanova, V.Vedia, O.Yordanov

Fast-timing measurements in the ground-state band of 114Pd

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, γγ-coin, level half-lives by fast-timing γγ(t) technique using Gammasphere array with 51 HPGe detectors, and FATIMA array with 25 LaBr3(Ce) detectors at the Argonne National Laboratory. 114Pd; deduced levels, J, π, half-lives for the first 2+, 4+ and 6+ states, B(E2), transition quadrupole moments, β2. Comparison of experimental B(E2) values with those predicted by the vibrator, rigid axial rotor, Wilets-Jean and Davydov-Filippov models. Systematics of B(E2) values for the first 2+ state in Z=44-48, N=56-74 even-even nuclei.

doi: 10.1103/PhysRevC.100.044309
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2018AU04      Phys.Rev.Lett. 121, 182501 (2018)

K.Auranen, D.Seweryniak, M.Albers, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, C.J.Chiara, P.Copp, H.M.David, D.T.Doherty, J.Harker, C.R.Hoffman, R.V.F.Janssens, T.L.Khoo, S.A.Kuvin, T.Lauritsen, G.Lotay, A.M.Rogers, J.Sethi, C.Scholey, R.Talwar, W.B.Walters, P.J.Woods, S.Zhu

Superallowed α Decay to Doubly Magic 100Sn

RADIOACTIVITY 108Xe, 104Te(α) [from 54Fe(58Ni, 4n)108Xe, E=245 MeV]; measured decay products, Eα, Iα; deduced α-particles energies, T1/2. A heavy self-conjugate nucleus, comparison with available data.

doi: 10.1103/PhysRevLett.121.182501
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2018CH36      Phys.Rev. C 98, 014325 (2018)

J.Chen, C.R.Hoffman, T.Ahn, K.Auranen, M.L.Avila, B.B.Back, D.W.Bardayan, D.Blankstein, P.Copp, D.Gorelov, B.P.Kay, S.A.Kuvin, J.P.Lai, D.G.McNeel, P.D.O'Malley, A.M.Rogers, D.Santiago-Gonzalez, J.P.Schiffer, J.Sethi, R.Talwar, J.R.Winkelbauer

Experimental study of the effective nucleon-nucleon interaction using the 21F(d, p)22F reaction

NUCLEAR REACTIONS 2H(21F, p), E=10 MeV/nucleon, [21F secondary beam from 9Be(22Ne, 21F), E=11 MeV/nucleon primary reaction using ATLAS-ANL facility]; measured Ep, Ip, 22Fe recoils, (22F)p-coin, and σ(θ) using HELIcal Orbit Spectrometer (HELIOS). 22F; deduced levels, J, π, spectroscopic factors and strengths, energy centroids and diagonal particle-hole two-body matrix elements (TBMEs) as function of angular momentum, N=14, 16 shell gaps. Distorted wave Born approximation (DWBA) method for theoretical σ(θ) calculations. Comparison with theoretical spectroscopic strengths by shell-model calculation using the USDA and USDB interactions.

doi: 10.1103/PhysRevC.98.014325
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2018GA23      Acta Phys.Pol. B49, 555 (2018)

E.R.Gamba, A.M.Bruce, M.Rudigier, S.Lalkovski, S.Bottoni, M.P.Carpenter, S.Zhu, A.D.Ayangeakaa, J.T.Anderson, T.A.Berry, I.Burrows, R.J.Carrol, P.Copp, M.Carmona-Gallardo, D.M.Cullen, T.Daniel, G.Fernandez-Martinez, J.P.Greene, L.A.Gurgi, D.J.Hartley, R.Ilieva, S.Ilieva, R.V.F.Janssens, F.G.Kondev, T.Kroll, G.J.Lane, T.Lauritsen, I.Lazarus, G.Lotay, C.R.Nita, Zs.Podolyak, V.Pucknell, M.Reed, P.H.Regan, J.Rohrer, J.Sethi, D.Seweryniak, C.M.Shand, J.Simpson, M.Smolen, V.Vedia, E.A.Stefanova, O.Yordanov

Fast-timing Measurements in 100Zr Using LaBr3(Ce) Detectors Coupled with Gammasphere

RADIOACTIVITY 252Cf(SF); measured 100Zr fission fragment 4+ state Eγ, Iγ, T1/2, fission partners fragments using Digital Gammasphere (DGS) acquisition with hybrid detector made of 51 HPGe from Gammasphere and 25 LaBr3(Ce) scintillators (part of UK NuSTAR Collaboration); deduced first excited state T1/2, deformation, quadrupole moment, B(E2), LaBr3(Ce) γ-γ matrix, DGS γ-γ matrix, centroid difference between delayed and anti-delayed time distributions. Results preliminary, the main aim was the feasibility study.

doi: 10.5506/aphyspolb.49.555
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2018HA19      Phys.Rev.Lett. 120, 182502 (2018)

D.J.Hartley, F.G.Kondev, R.Orford, J.A.Clark, G.Savard, A.D.Ayangeakaa, S.Bottoni, F.Buchinger, M.T.Burkey, M.P.Carpenter, P.Copp, D.A.Gorelov, K.Hicks, C.R.Hoffman, C.Hu, R.V.F.Janssens, J.W.Klimes, T.Lauritsen, J.Sethi, D.Seweryniak, K.S.Sharma, H.Zhang, S.Zhu, Y.Zhu

Masses and β-Decay Spectroscopy of Neutron-Rich Odd-Odd 160, 162Eu Nuclei: Evidence for a Subshell Gap with Large Deformation at N=98

RADIOACTIVITY 160,162Eu(β-); measured decay products, Eγ, Iγ; deduced γ-ray energies, partial level scheme, T1/2.

ATOMIC MASSES 160,162Eu; measured frequency ratios; deduced mass excess (ME) for the ground and isomeric states.

doi: 10.1103/PhysRevLett.120.182502
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2018SI28      Phys.Rev. C 98, 054307 (2018)

K.Siegl, K.Kolos, N.D.Scielzo, A.Aprahamian, G.Savard, M.T.Burkey, M.P.Carpenter, P.Chowdhury, J.A.Clark, P.Copp, G.J.Lane, C.J.Lister, S.T.Marley, E.A.McCutchan, A.J.Mitchell, J.Rohrer, M.L.Smith, S.Zhu

Β-decay half-lives of 134, 134mSb and their isomeric yield ratio produced by the spontaneous fission of 252Cf

RADIOACTIVITY 134m,134Sb(β-)[from 252Cf(SF), mass separated high-intensity beams]; measured Eβ, Iβ, Eγ, Iγ, βγ-coin, half-lives of decays of 134Sb and 134mSb, and isomeric yield ratios from 252Cf(SF) using the Scintillator And Tape Using Radioactive Nuclei (SATURN) system for β- detection, and X-Array for γ detection at the CARIBU facility of ANL. Systematics of isomeric yield ratios of 128,130,134Sb, 131,133Te, 132,134,136I, 135Xe, 138Cs from 252Cf(SF). Comparison with previous experimental values.

doi: 10.1103/PhysRevC.98.054307
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2017RU02      Acta Phys.Pol. B48, 351 (2017)

M.Rudigier, S.Lalkovski, E.R.Gamba, A.M.Bruce, Zs.Podolyak, P.H.Regan, M.Carpenter, S.Zhu, A.D.Ayangeakaa, J.T.Anderson, T.Berry, S.Bottoni, I.Burrows, R.Carroll, P.Copp, D.Cullen, T.Daniel, L.Fraile, M.Carmona-Gallardo, A.Grant, J.P.Greene, L.A.Guegi, D.Hartley, R.Ilieva, S.Ilieva, R.V.F.Janssens, F.G.Kondev, T.Kroll, G.J.Lane, T.Lauritsen, I.Lazarus, G.Lotay, G.Fernandez-Martinez, V.Pucknell, M.Reed, J.Rohrer, J.Sethi, D.Seweryniak, C.M.Shand, J.Simpson, M.Smolen, E.Stefanova, V.Vedia, O.Yordanov

Fast Timing Measurement Using an LaBr3(Ce) Scintillator Detector Array Coupled with Gammasphere

doi: 10.5506/APhysPolB.48.351
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2017WE06      Phys.Lett. B 771, 119 (2017)

T.Welsh, W.Loveland, R.Yanez, J.S.Barrett, E.A.McCutchan, A.A.Sonzogni, T.Johnson, S.Zhu, J.P.Greene, A.D.Ayangeakaa, M.P.Carpenter, T.Lauritsen, J.L.Harker, W.B.Walters, B.M.S.Amro, P.Copp

Modeling multi-nucleon transfer in symmetric collisions of massive nuclei

NUCLEAR REACTIONS 198Pt(204Hg, X), E=1360 MeV; measured reaction products, Eγ, Iγ; deduced fragment yields, σ. Comparison with GRAZING and DNS models.

doi: 10.1016/j.physletb.2017.05.044
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2016CU02      Phys.Rev. C 94, 034313 (2016)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

8Be + 8Be and 12C + α breakup states in 16O populated via the 13C(4He, 4α)n reaction

NUCLEAR REACTIONS 13C(α, 16O), E=22.0, 27.0, 27.5, 28.0 MeV; measured reaction products using four position-sensitive double-sided Si strip detectors, at Notre Dame FN Tandem accelerator facility. 16O; deduced levels identified through the 8Be+8Be and 12C*+α channels, J, π, centroids, cross sections. Comparison with previous studies using 12C(α, 8Be)8Be and 12C(16O, 4α)12C reactions. Relevance to 4α chain structure in 16O.

doi: 10.1103/PhysRevC.94.034313
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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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2016SM02      Phys.Rev. C 94, 014320 (2016)

R.Smith, C.Wheldon, M.Freer, N.Curtis, Tz.Kokalova, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, V.A.Ziman

Evidence for a 3.8 MeV state in 9Be

NUCLEAR REACTIONS 9Be(α, n3α), E=22, 26 MeV; measured Eα, Iα using an array of double-sided silicon strip detectors (DSSSDs) at the Notre Dame FN Tandem Van de Graaff accelerator facility; extracted sum energy spectra for all four final-state particles, assumed to be 3α+n, 9Be excitation spectrum. 9Be; deduced levels, new state at 3.8 MeV, J, π, width, ratios of reduced widths to Wigner limits (decays to 8Be ground state). 9Be, 9B; comparison of levels and widths in mirror nuclei.

doi: 10.1103/PhysRevC.94.014320
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2013CU04      Phys.Rev. C 88, 064309 (2013)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Investigation of the 4α linear chain state in 16O

NUCLEAR REACTIONS 12C(α, 8Be)8Be, (α, 12C), [12C* decaying to 8Be+α], E=12.2-20.0 MeV; measured Eα, Iα, α(θ), αα-coin, σ(E, θ) at Notre Dame FN tandem facility. Phase shift analysis of σ(θ) data. 16O; deduced levels, resonances, J. Comparison with previous experimental results. No evidence found for rigid, 4α-linear chain in 16O.

doi: 10.1103/PhysRevC.88.064309
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2013KO15      Phys.Rev. C 87, 057309 (2013)

Tz.Kokalova, M.Freer, N.Curtis, N.I.Ashwood, M.Barr, J.D.Malcolm, C.Wheldon, V.A.Ziman, S.Almaraz-Calderon, A.Aprahamian, B.Bucher, M.Couder, X.Fang, F.Jung, W.Lu, A.Roberts, W.P.Tan, P.Copp, S.R.Lesher

Yield measurements for resonances above the multi-α threshold in 20Ne

NUCLEAR REACTIONS 16O(α, X), E=23.0-29.0 MeV; measured α and particle spectra, (particle)(particle)α-coin, yields for 8Be+8Be+α, and 8Be+12C(second 0+) channels. Measurements at Notre Dame facility. 20Ne; deduced levels, resonances, J. Monte Carlo simulations.

doi: 10.1103/PhysRevC.87.057309
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2012CU04      J.Phys.:Conf.Ser. 381, 012079 (2012)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Does a 4-α linear chain exist in 16O?

NUCLEAR REACTIONS 12C(α, 8Be), E=12.2-20.0 MeV; measured Eα, Iα from 8Be decay using DSSSD; deduced σ(θ=900), doublet 6+ resonance and its components.

doi: 10.1088/1742-6596/381/1/012079
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2012FR11      J.Phys.:Conf.Ser. 381, 012009 (2012)

M.Freer, S.Almaraz-Calderon, J.Carter, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, R.Smit, W.P.Tan, C.Wheldon, V.A.Ziman

Simplicity from Complexity

doi: 10.1088/1742-6596/381/1/012009
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2011FR02      Phys.Rev. C 83, 034314 (2011)

M.Freer, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Evidence for a new 12C state at 13.3 MeV

NUCLEAR REACTIONS 9Be, 12C(α, 3α), E=22-30 MeV; measured Eα, Iα, 12C-α angular correlations; deduced Dalitz plot. 12C; deduced levels, J, π, width. Possible collective excitation of Hoyle state.

doi: 10.1103/PhysRevC.83.034314
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