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NSR database version of April 11, 2024.

Search: Author = T.Renstrom

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2024UT01      Phys.Rev. C 109, 014617 (2024)

H.Utsunomiya, S.Goriely, M.Kimura, N.Shimizu, Y.Utsuno, G.M.Tveten, T.Renstrom, T.Ari-izumi, S.Miyamoto

Photoneutron emission cross sections for 13C

doi: 10.1103/PhysRevC.109.014617
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2023LA08      Phys.Rev. C 108, 025804 (2023)

A.C.Larsen, G.M.Tveten, T.Renstrom, H.Utsunomiya, E.Algin, T.Ari-izumi, K.O.Ay, F.L.Bello Garrote, L.Crespo Campo, F.Furmyr, S.Goriely, A.Gorgen, M.Guttormsen, V.W.Ingeberg, B.V.Kheswa, I.K.B.Kullmann, T.Laplace, E.Lima, M.Markova, J.E.Midtbo, S.Miyamoto, A.H.Mjos, V.Modamio, M.Ozgur, F.Pogliano, S.Riemer-Sorensen, E.Sahin, S.Shen, S.Siem, A.Spyrou, M.Wiedeking

New experimental constraint on the 185W(n, γ)186W cross section

NUCLEAR REACTIONS 182,183,184W(γ, n), E=6.5-13 MeV; measured In, En; deduced σ(E), γ-ray strength function (GSF). 186W(α, α'γ), E=30 MeV; measured Eα, Iα, Eγ, Iγ, αγ-coin; deduced nuclear level density (NLD), γ-ray strength function (GSF). 185W(n, γ), T=0.5-1.1 GK; calculated Maxwellian averaged σ(E) (MACS), reaction rate (stellar reactivity), compared with experimental results, and recommended σ in compilations by Bao et al. Comparison to other experimental data, TALYS calculations and KADONIS-1.0 data. Photoneutron reactions were measured with quasi-monochromatic photon beam at NewSubaru synchrotron radiation facility using 4π detector consisting of 20 3He proportional counters. Experiment on inelastic α-scattering was performed at the Oslo Cyclotron Laboratory (OCL) using CACTUS NaI(Tl) scintillator γ-ray detector array, the Silicon Ring (SiRi) detector array and beam from MC-35 Scanditronix cyclotron.

doi: 10.1103/PhysRevC.108.025804
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2023LE04      Eur.Phys.J. A 59, 42 (2023)

R.Lewis, A.Couture, S.N.Liddick, A.Spyrou, D.L.Bleuel, L.Crespo Campo, B.P.Crider, A.C.Dombos, M.Guttormsen, T.Kawano, A.C.Larsen, A.M.Lewis, S.Mosby, G.Perdikakis, C.J.Prokop, S.J.Quinn, T.Renstrom, S.Siem

Statistical (n, γ) cross section model comparison for short-lived nuclei

NUCLEAR REACTIONS 73Zn(n, γ), E<1 MeV; calculated σ using TALYS, EMPIRE, and CoH, level densities, γ-ray strength function. Comparison with experimental data.

doi: 10.1140/epja/s10050-023-00920-0
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2023MA33      Phys.Rev. C 108, 014315 (2023)

M.Markova, A.C.Larsen, G.M.Tveten, P.von Neumann-Cosel, T.K.Eriksen, F.L.Bello Garrote, L.Crespo Campo, F.Giacoppo, A.Gorgen, M.Guttormsen, K.Hadynska-Klek, M.Klintefjord, T.Renstrom, E.Sahin, S.Siem, T.G.Tornyi

Nuclear level densities and γ-ray strength functions of 111, 112, 113Sn isotopes studied with the Oslo method

NUCLEAR REACTIONS 112Sn(p, p'γ), E=25 MeV;112Sn(p, dγ), E=16 MeV;113Sn(d, pγ), E=11.5 MeV; measured reaction products, charged particles, deuteron spectra, Ep, Ip, Eγ, Iγ, pγ-coin, (deuteron)γ-coin. 111,112,113Sn; deduced nuclear level density, experimental entropy, γ-strength functions, parameters of isovector giant dipole resonance, E1 and M1 strength distributions. Oslo method type of analysis. Comparison to the data obtained with different methods and to the data on the other isotopes from Sn chain. All three nuclei demonstrate a trend compatible with the constant-temperature model. CACTUS NaI(Tl) scintillator γ-ray detector array and the Silicon Ring (SiRi) detector array at MC-35 Scanditronix cyclotron.

doi: 10.1103/PhysRevC.108.014315
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2022BE24      Phys.Lett. B 834, 137479 (2022)

F.L.Bello Garrote, A.Lopez-Martens, A.C.Larsen, I.Deloncle, S.Peru, F.Zeiser, P.T.Greenlees, B.V.Kheswa, K.Auranen, D.L.Bleuel, D.M.Cox, L.Crespo Campo, F.Giacoppo, A.Gorgen, T.Grahn, M.Guttormsen, T.W.Hagen, L.Harkness-Brennan, K.Hauschild, G.Henning, R.-D.Herzberg, R.Julin, S.Juutinen, T.A.Laplace, M.Leino, J.E.Midtbo, V.Modamio, J.Pakarinen, P.Papadakis, J.Partanen, T.Renstrom, K.Rezynkina, M.Sandzelius, J.Saren, C.Scholey, S.Siem, J.Sorri, S.Stolze, J.Uusitalo

Experimental observation of the M1 scissors mode in 254No

NUCLEAR REACTIONS 208Pb(48Ca, 2n)254No, E=220, 222 MeV; 154Sm(48Ca, 6n)196Pb, E not given; measured Eγ, Iγ, prompt and recoil-gated γ-ray singles spectra, polarization asymmetries of discreet γ rays in 254No and 196Pb; deduced experimental γ-ray yield and compared with simulated γ spectra using RAINIER code, γ-strength function (γSF), B(M1), B(E1), widths, scissors mode of excitation in 254No. Comparison with BSFG + E1SLO + M1SLO model combination; tested parameters for the GDR and the spin-flip resonance by HFB calculations. Comparison of B(M1) strength with QRPA calculations.

doi: 10.1016/j.physletb.2022.137479
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2022GU17      Phys.Rev. C 106, 034314 (2022)

M.Guttormsen, K.O.Ay, M.Ozgur, E.Algin, A.C.Larsen, F.L.Bello Garrote, H.C.Berg, L.Crespo Campo, T.Dahl-Jacobsen, F.W.Furmyr, D.Gjestvang, A.Gorgen, T.W.Hagen, V.W.Ingeberg, B.V.Kheswa, I.K.B.Kullmann, M.Klintefjord, M.Markova, J.E.Midtbo, V.Modamio, W.Paulsen, L.G.Pedersen, T.Renstrom, E.Sahin, S.Siem, G.M.Tveten, M.Wiedeking

Evolution of the γ-ray strength function in neodymium isotopes

NUCLEAR REACTIONS 142,144,146,148,150Nd(p, p'γ), (d, pγ), E(p)=16.0 MeV, E(d)=13.5 MeV; measured Eγ, Iγ, E(p), pγ-coin using SiRi array of 64 ΔE-E particle telescopes, and OSCAR array of 15 to 30 LaBr3(Ce) scintillators for γ detection at the Oslo Cyclotron Laboratory. 142,144,145,146,147,148,149,150,151Nd; deduced energies, widths and cross sections of giant dipole resonances (GDR), pygmy-dipole resonances (PDR), scissors mode (SM) resonances, low-energy enhancement (LEE) structures, average probability for populating levels, γ strength functions as function of Eγ, (γSF(Eγ)) and nuclear level densities (NLD) using the OSLO method, integrated LEE and SM strengths B(M1), cross over from spherical to deformed shapes for neodymium isotopes.

doi: 10.1103/PhysRevC.106.034314
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2022NA07      Nucl.Phys. A1018, 122359 (2022)

F.Naqvi, S.Karampagia, A.Spyrou, S.N.Liddick, A.C.Dombos, D.L.Bleuel, B.A.Brown, L.Crespo Campo, A.Couture, B.Crider, T.Ginter, M.Guttormsen, A.C.Larsen, R.Lewis, P.Moller, S.Mosby, G.Perdikakis, C.Prokop, T.Renstrom, S.Siem

Total absorption spectroscopy measurement on neutron-rich 74, 75Cu isotopes

RADIOACTIVITY 74,75Cu(β-) [from 9Be(86Kr, X), E=140 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced T1/2, cumulative β-decay intensities, B(GT). Comparison with available data.

doi: 10.1016/j.nuclphysa.2021.122359
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2021GU12      Phys.Lett. B 816, 136206 (2021)

M.Guttormsen, Y.Alhassid, W.Ryssens, K.O.Ay, M.Ozgur, E.Algin, A.C.Larsen, F.L.Bello Garrote, L.Crespo Campo, T.Dahl-Jacobsen, A.Gorgen, T.W.Hagen, V.W.Ingeberg, B.V.Kheswa, M.Klintefjord, J.E.Midtbo, V.Modamio, T.Renstrom, E.Sahin, S.Siem, G.M.Tveten, F.Zeiser

Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes

NUCLEAR REACTIONS 142,144,146,148,150Nd(p, X), E=16 MeV; 142,144,146,148,150Nd(α, X), E=13.5 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, nuclear level densities, quadrupole deformation parameters. Comparison with the shell model Monte Carlo (SMMC) calculations.

doi: 10.1016/j.physletb.2021.136206
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2021MA04      Phys.Rev. C 103, 014309 (2021)

K.L.Malatji, K.S.Beckmann, M.Wiedeking, S.Siem, S.Goriely, A.C.Larsen, K.O.Ay, F.L.Bello Garrote, L.Crespo Campo, A.Gorgen, M.Guttormsen, V.W.Ingeberg, P.Jones, B.V.Kheswa, P.von Neumann-Cosel, M.Ozgur, G.Potel, L.Pellegri, T.Renstrom, G.M.Tveten, F.Zeiser

Statistical properties of the well deformed 153, 155Sm nuclei and the scissors resonance

NUCLEAR REACTIONS 152Sm(d, pγ)153Sm, E=13.5 MeV; 154Sm(d, pγ)155Sm, E=13 MeV; measured Eγ, Iγ, charged particles, (particle)γ-coin using SiRi particle telescope and CACTUS scintillator arrays at the University of Oslo Cyclotron Laboratory; deduced γ strength functions (γSF) and nuclear level densities (NLD) using the Oslo method and normalized using rigid moment of inertia (RMI) and Hartree-Fock-Bogoliubov plus combinatorial (HFB+comb) models, and extrapolated with the constant temperature (CT) and Fermi gas models, pronounced M1 scissors resonances (SR). Comparison with quasi-particle random phase approximation (QRPA) calculations, with D1M Gogny interaction, and with results of previous experimental results using (d, pγ) and other reactions.

doi: 10.1103/PhysRevC.103.014309
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2021PE08      Phys.Rev. C 103, 055808 (2021)

C.F.Persch, P.A.DeYoung, S.Lyons, A.Spyrou, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, J.Gombas, D.L.Bleuel, B.A.Brown, A.Couture, L.Crespo Campo, J.Engel, M.Guttormsen, A.C.Larsen, R.Lewis, S.Karampagia, S.Mosby, E.M.Ney, A.Palmisano, G.Perdikakis, C.J.Prokop, T.Renstrom, S.Siem, M.K.Smith, S.J.Quinn

β-decay feeding intensity distributions of 71, 73Ni

RADIOACTIVITY 71,73Ni(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured implantation events and β particles using position-sensitive, double-sided, silicon-strip detector (DSSD), and two silicon PIN detectors for TOF and energy loss, Eγ, Iγ, half-lives of decays of 71,73Ni using a total absorption summing NaI(Tl) detector (SuN) surrounding the DSSD; deduced multiplicity spectra, Iβ(E) feedings, B(GT). GEANT4 and DICEBOX analysis of total absorption spectrum (TAS). Comparison with QRPA, and shell-model calculations, the latter using NuShellX@MSU code with JJ44B and JUN45 interaction Hamiltonians. Relevance to improvement in the nuclear input for r-process calculations.

NUCLEAR REACTIONS 9Be(86Kr, X)71Ni/73Ni/71Cu/73Cu/, E=140 MeV/nucleon; measured yields of reaction products using A1900 fragment separator and two silicon PIN detectors for TOF and energy loss at NSCL-MSU facility.

doi: 10.1103/PhysRevC.103.055808
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2020KA09      Nucl.Data Sheets 163, 109 (2020)

T.Kawano, Y.S.Cho, P.Dimitriou, D.Filipescu, N.Iwamoto, V.Plujko, X.Tao, H.Utsunomiya, V.Varlamov, R.Xu, R.Capote, I.Gheorghe, O.Gorbachenko, Y.L.Jin, T.Renstrom, M.Sin, K.Stopani, Y.Tian, G.M.Tveten, J.M.Wang, T.Belgya, R.Firestone, S.Goriely, J.Kopecky, M.Krticka, R.Schwengner, S.Siem, M.Wiedeking

IAEA Photonuclear Data Library 2019

doi: 10.1016/j.nds.2019.12.002
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2020KI17      Phys.Rev.Lett. 125, 182701 (2020)

T.Kibedi, B.Alshahrani, A.E.Stuchbery, A.C.Larsen, A.Gorgen, S.Siem, M.Guttormsen, F.Giacoppo, A.I.Morales, E.Sahin, G.M.Tveten, F.L.Bello Garrote, L.Crespo Campo, T.K.Eriksen, M.Klintefjord, S.Maharramova, H.-T.Nyhus, T.G.Tornyi, T.Renstrom, W.Paulsen

Radiative Width of the Hoyle State from γ-Ray Spectroscopy

NUCLEAR REACTIONS 12C(p, p'), E=10.7 MeV; measured reaction products, Eγ, Iγ, γ-γ-p coin.; deduced γ-ray energies, resonances, radiative branching ratio, radiative widths. Comparison with available data.

doi: 10.1103/PhysRevLett.125.182701
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2019BR10      Phys.Rev. C 99, 054330 (2019)

C.P.Brits, K.L.Malatji, M.Wiedeking, B.V.Kheswa, S.Goriely, F.L.Bello Garrote, D.L.Bleuel, F.Giacoppo, A.Gorgen, M.Guttormsen, K.Hadynska-Klek, T.W.Hagen, S.Hilaire, V.W.Ingeberg, H.Jia, M.Klintefjord, A.C.Larsen, S.N.T.Majola, P.Papka, S.Peru, B.Qi, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, G.M.Tveten, F.Zeiser

Nuclear level densities and γ-ray strength functions of 180, 181, 182Ta

NUCLEAR REACTIONS 181Ta(d, p), E=12.5 MeV; 181Ta(d, d'), (d, t), E=12.5, 15 MeV; 181Ta(3He, 3He'), (3He, α), E=34 MeV; measured Ep, Ip, Ed, Id, E(t), I(t), E(3He), I(3He), Eα, Iα, Eγ, Iγ, and (particle)γ-coin using the SiRi particle telescope for charged particles and CACTUS scintillator for γ detection at the Oslo Cyclotron Laboratory. 180,181,182Ta; deduced γ strength functions (γSF), nuclear level densities (NLDs) by OSLO method, energy and γ deformation of scissors resonance (SR). Back-shifted Fermi-gas, constant temperature plus Fermi gas, and Hartree-Fock-Bogoliubov plus combinatorial models used for absolute normalization of experimental NLDs at the neutron separation energies. 181Ta(n, γ), E=0.004-1 MeV; deduced σ(E). Comparison with theoretical model calculations, and with previous experimental results. 181,182Ta; calculated potential energy surfaces in (ϵ2, γ) plane for the ground states using the cranking Nilsson model plus shell correction method.

doi: 10.1103/PhysRevC.99.054330
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2019KR16      Acta Phys.Pol. B50, 487 (2019)

M.Krzysiek, H.Utsunomiya, I.Gheorghe, D.M.Filipescu, T.Renstrom, G.M.Tveten, S.Belyshev, K.Stopani, H.Wang, G.Fan, Y.-W.Lui, D.Symochko, S.Goriely, A.-C.Larsen, S.Siem, V.Varlamov, B.Ishkhanov, T.Ari-izumi, S.Miyamoto

Photoneutron Cross-section Measurements for 165Ho by the Direct Neutron-Multiplicity Sorting at NewSUBARU

NUCLEAR REACTIONS 165Ho(γ, γ'), E=11.5-43.2 MeV; measured In, neutron multiplicity; deduced photoneutron σ(E). Flat-efficeincy neutron detector for direct neutron-multiplicity sorting method.

doi: 10.5506/aphyspolb.50.487
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2019KU11      Phys.Rev. C 99, 065806 (2019)

I.K.B.Kullmann, A.C.Larsen, T.Renstrom, K.S.Beckmann, F.L.Bello Garrote, L.Crespo Campo, A.Gorgen, M.Guttormsen, J.E.Midtbo, E.Sahin, S.Siem, G.M.Tveten, F.Zeiser

First experimental constraint on the 191Os(n, γ) reaction rate relevant to s-process nucleosynthesis

NUCLEAR REACTIONS 192Os(α, α'), E=30 MeV; measured Eα, Iα, Eγ, Iγ, and αγ-coin using the CACTUS array for γ detection and the SiRi array for charged particle detection at the Oslo Cyclotron Laboratory. 192Os; deduced nuclear level density and γ-ray strength function. 191Os(n, γ), E=0-100 keV; calculated Maxwellian-averaged σ(E) using TALYS code, and compared with KADoNiS database and evaluated libraries such as TENDL-2017, ENDF/B-VII.0, and JEFF. Systematics of γ-strength functions, nuclear level densities and average radiative widths for 187,188,189,190,192,193Os, 181,183,184,185,187W, 186,188Re, 192,193,194Ir.

doi: 10.1103/PhysRevC.99.065806
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2019LE05      Phys.Rev. C 99, 034601 (2019)

R.Lewis, S.N.Liddick, A.C.Larsen, A.Spyrou, D.L.Bleuel, A.Couture, L.Crespo Campo, B.P.Crider, A.C.Dombos, M.Guttormsen, S.Mosby, F.Naqvi, G.Perdikakis, C.J.Prokop, S.J.Quinn, T.Renstrom, S.Siem

Experimental constraints on the 73Zn(n, γ)74Zn reaction rate

RADIOACTIVITY 74Cu(β-)[74Cu ions from Be(86Kr, X), E=140 MeV/nucleon reaction and using A1900 separator at NSCL-MSU facility]; measured β particles, Eγ, Iγ, βγ-coin, half-life of 74Cu decay using the Summing NaI detector for total absorption spectroscopy (TAS); deduced nuclear level density (NLD), and γ strength function (γSF) using the β-Oslo method, distribution of spins for levels in 74Zn around S(n). Comparison with previous experimental results, and with theoretical calculations using TALYS code. Results used to deduce σ for 73Zn(n, γ) reaction.

NUCLEAR REACTIONS 73Zn(n, γ), E=0.01-1 MeV; deduced σ(E), and astrophysical reaction rates using the experimental NLD and γSF. Comparison with Hauser-Feshbach statistical model calculations using TALYS code.

doi: 10.1103/PhysRevC.99.034601
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2019LI35      Phys.Rev. C 100, 024624 (2019)

S.N.Liddick, A.C.Larsen, M.Guttormsen, A.Spyrou, B.P.Crider, F.Naqvi, J.E.Midtbo, F.L.Bello Garrote, D.L.Bleuel, L.Crespo Campo, A.Couture, A.C.Dombos, F.Giacoppo, A.Gorgen, K.Hadynska-Klek, T.W.Hagen, V.W.Ingeberg, B.V.Kheswa, R.Lewis, S.Mosby, G.Perdikakis, C.J.Prokop, S.J.Quinn, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, G.M.Tveten, M.Wiedeking, F.Zeiser

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β-Oslo method

RADIOACTIVITY 51Sc(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon]; measured Eβ, Iβ, Eγ, Iγ, βγ-coin; deduced level density, γ-strength function. Measurement was performed at NSCL using the Summing NaI(Tl) detector SuN, used as a TAS.

NUCLEAR REACTIONS 50Ti(d, p)51Ti, E=12.5 MeV; measured Ep, Ip, Eγ, Iγ, γp-coin; deduced nuclear level density (NLD), γ strength function (γSF). Measurement was performed at the Oslo Cyclotron Laboratory, Sweden using the CACTUS NaI scintillator array.

doi: 10.1103/PhysRevC.100.024624
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2019LY02      Phys.Rev. C 100, 025806 (2019)

S.Lyons, A.Spyrou, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, D.L.Bleuel, B.A.Brown, A.Couture, L.Crespo Campo, J.Engel, M.Guttormsen, A.C.Larsen, R.Lewis, P.Moller, S.Mosby, M.R.Mumpower, E.M.Ney, A.Palmisano, G.Perdikakis, C.J.Prokop, T.Renstrom, S.Siem, M.K.Smith, S.J.Quinn

69, 71Co β-decay strength distributions from total absorption spectroscopy

RADIOACTIVITY 69,71Co(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon, followed by in flight separation of fragments by the A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, Eβ, βγ-coin, half-lives of decays of 69,71Co decays, total absorption spectra using Summing NaI(Tl) (SuN) detector for γ rays and double-sided silicon strip detector (DSSD) for β; deduced cumulative Iβ distributions and compared to QRPA and Skyrme QRPA calculations, Gamow-Teller (GT) strength distribution. Comparison of decay half-lives with ENSDF values, and theoretical calculations using shell mode, QRPA and Skyrme QRPA. Relevance to r process in nucleosynthesis.

doi: 10.1103/PhysRevC.100.025806
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2019MA20      Phys.Lett. B 791, 403 (2019)

K.L.Malatji, M.Wiedeking, S.Goriely, C.P.Brits, B.V.Kheswa, F.L.Bello Garrote, D.L.Bleuel, F.Giacoppo, A.Gorgen, M.Guttormsen, K.Hadynska-Klek, T.W.Hagen, V.W.Ingeberg, M.Klintefjord, A.C.Larsen, P.Papka, T.Renstrom, E.Sahin, S.Siem, L.Siess, G.M.Tveten, F.Zeiser

Re-estimation of 180Ta nucleosynthesis in light of newly constrained reaction rates

NUCLEAR REACTIONS 180,181,182Ta(n, γ), E ∼ 30 keV; analyzed available data on the nuclear level densities and γ-ray strength functions below the neutron thresholds; calculated σ, reaction rates; deduced s- and p-process nucleosynthesis results.

doi: 10.1016/j.physletb.2019.03.013
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2019UT01      Phys.Rev. C 99, 024609 (2019)

H.Utsunomiya, T.Renstrom, G.M.Tveten, S.Goriely, T.Ari-izumi, D.Filipescu, J.Kaur, Y.-W.Lui, W.Luo, S.Miyamoto, A.C.Larsen, S.Hilaire, S.Peru, A.J.Koning

γ-ray strength function for thallium isotopes relevant to the 205Pb - 205Tl chronometry

NUCLEAR REACTIONS 203,205Tl(γ, n), E=7.9-13.0 MeV; measured E(n), I(n), σ(E) using 4π 3He proportional counter array for neutron detection at NewSUBARU synchrotronic radiation facility; deduced GDR parameters and γ-ray strength function (γSF), the latter on the basis of the Hartree-Fock-Bogolyubov plus quasiparticle random-phase approximation using the Gogny D1M interaction for E1 and M1 components with the zero-limit correction (QRPA+D1M+0lim). 203,205Tl(n, γ), Eγ=0.001-4 MeV; calculated σ(E) with the D1M+QRPA+0lim, and compared with available experimental results. 204Tl(n, γ), T=0-1 GK; calculated Maxwellian averaged σ(E) (MACS) with the D1M+QRPA+0lim strength function, and compared with experimental results, and recommended σ in compilations by Bao et al.

doi: 10.1103/PhysRevC.99.024609
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2019UT02      Phys.Rev. C 100, 034605 (2019)

H.Utsunomiya, T.Renstrom, G.M.Tveten, S.Goriely, T.Ari-izumi, V.W.Ingeberg, B.V.Kheswa, Y.-W.Lui, S.Miyamoto, S.Hilaire, S.Peru, A.J.Koning

γ-ray strength function for barium isotopes

NUCLEAR REACTIONS 137Ba(γ, n)136Ba, E=7-13 MeV; 138Ba(γ, n)137Ba, E=8.75-13 MeV from laser Compton scattering at the NewSUBARU synchrotron radiation facility at the University of Hyogo; measured En, In; deduced σ(E), E1 and M1 γ-strength functions; σ(E) compared to TALYS calculations. The photoneutron data used to constrain the γ strength function on the basis of the Hartree-Fock-Bogolyubov plus quasiparticle random phase approximation using the Gogny D1M interaction. Comparison with previous experimental data. 131,133Ba(n, γ), kT=30 keV; estimated Maxwellian-averaged cross sections.

doi: 10.1103/PhysRevC.100.034605
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2019VO05      Phys.Rev. C 99, 054609 (2019)

A.V.Voinov, T.Renstrom, D.L.Bleuel, S.M.Grimes, M.Guttormsen, A.C.Larsen, S.N.Liddick, G.Perdikakis, A.Spyrou, S.Akhtar, N.Alanazi, K.Brandenburg, C.R.Brune, T.W.Danley, S.Dhakal, P.Gastis, R.Giri, T.N.Massey, Z.Meisel, S.Nikas, S.N.Paneru, C.E.Parker, A.L.Richard

Level densities of 74, 76Ge from compound nuclear reactions

NUCLEAR STRUCTURE 68,70Zn(7Li, p), E=16 MeV; measured evaporated proton spectra from 2-25 MeV, σ, yields using silicon ΔE-E telescope at the Edwards tandem accelerator laboratory, Athens, Ohio. 74,76Ge; deduced nuclear level densities. Comparison with theoretical calculations using coupled-channel model of the EMPIRE code, GCM-RIPL-global, and BSFG-RIPL-global density models.

doi: 10.1103/PhysRevC.99.054609
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2018BE10      Phys.Rev. C 97, 064310 (2018)

F.L.Bello Garrote, A.Gorgen, C.Mihai, T.Abraham, L.Crespo Campo, J.-P.Delaroche, D.Filipescu, N.M.Florea, I.Gheorghe, D.G.Ghita, M.Girod, T.Glodariu, K.Hadynska-Klek, M.Klintefjord, J.Libert, R.Lica, T.Marchlewski, N.Marginean, R.Marginean, I.Mitu, A.Negret, C.R.Nita, F.Nowacki, A.Olacel, S.Pascu, T.Renstrom, E.Sahin, S.Siem, J.Srebrny, A.Stolarz, L.Stroe, S.Toma, T.G.Tornyi, A.Tucholski

Lifetime measurements in 138Nd

NUCLEAR REACTIONS 123Sb(19F, 4n), E=68 MeV; measured Eγ, Iγ, γγ-coin, half-lives of excited levels by recoil-distance Doppler shift technique using the ROSPHERE array at IFIN-HH, Bucharest. 138Nd; deduced levels, J, π, B(E1), B(E2), configurations; calculated Potential energy surface (PES) for the ground-state. Comparison with large-scale shell model, and constrained Hartree-Fock-Bogoliubov calculations with the Gogny D1S interaction. Discussed onset of collectivity in Nd isotopes below the N=82 shell closure from B(E2) systematics in 132,134,136,138,140Nd, 136Ce, 140,142Sm.

doi: 10.1103/PhysRevC.97.064310
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2018CR05      Phys.Rev. C 98, 054303 (2018)

L.Crespo Campo, M.Guttormsen, F.L.Bello Garrote, T.K.Eriksen, F.Giacoppo, A.Gorgen, K.Hadynska-Klek, M.Klintefjord, A.C.Larsen, T.Renstrom, E.Sahin, S.Siem, A.Springer, T.G.Tornyi, G.M.Tveten

Test of the generalized Brink-Axel hypothesis in 64, 65Ni

NUCLEAR REACTIONS 64Ni(p, p'γ), E=16 MeV; 64Ni(d, p), E=12.5 MeV; analyzed experimental data for pγ-coin, and dγ-coin data, reported in authors' previous publications 2016Cr04 and 2017Cr04; also analyzed the role of Porter-Thomas fluctuations as a function of excitation and γ-ray energies. 64,65Ni; deduced γ strength functions (γSF) for various initial excitation energies, and role of fluctuations in the γ strength functions. Discussed validity of generalized Brink-Axel (gBA) hypothesis.

doi: 10.1103/PhysRevC.98.054303
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2018LA07      Phys.Rev. C 97, 054329 (2018)

A.C.Larsen, J.E.Midtbo, M.Guttormsen, T.Renstrom, S.N.Liddick, A.Spyrou, S.Karampagia, B.A.Brown, O.Achakovskiy, S.Kamerdzhiev, D.L.Bleuel, A.Couture, L.Crespo Campo, B.P.Crider, A.C.Dombos, R.Lewis, S.Mosby, F.Naqvi, G.Perdikakis, C.J.Prokop, S.J.Quinn, S.Siem

Enhanced low-energy γ-decay strength of 70Ni and its robustness within the shell model

RADIOACTIVITY 70Co(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon followed by fragment separation using A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, summed γ energies, β-γ-coin using double-sided silicon strip detector (DSSD) for electrons placed in the center of the Summing NaI (SuN) total absorption spectrometer for γ radiation. 70Ni; deduced nuclear level density (NLD) and γ-strength function (γSF) using β-Oslo method. Comparison with previous experimental results, and with HFB+c calculations.

NUCLEAR STRUCTURE 70Ni; calculated levels, J, π, B(E2), level densities, γSF, summed γSF, and M1 γ strengths for A=56-76 Ni isotopes. Quasiparticle time-blocking approximation and large-scale shell-model calculations with CA48MH1G and JUN45 interactions. Comparison with experimental results.

doi: 10.1103/PhysRevC.97.054329
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2018MI22      Phys.Rev. C 98, 064321 (2018)

J.E.Midtbo, A.C.Larsen, T.Renstrom, F.L.Bello Garrote, E.Lima

Consolidating the concept of low-energy magnetic dipole decay radiation

NUCLEAR STRUCTURE 60,61,62,63,64,65,66,67,68Ga, 69,70,71,72,73,74,75,76,77,78,79,80Ga, 59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75Ni, 60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76Cu, 60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78Zn, 60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81Ge, 61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81As, 78,79,80,81,82Se, 21,22,23,24,25,26,27,28,29,30,31,32,33Al, 16,17,18,19,20,21,22,23,24,25,26O, 18,19,20,21,22,23,24,25,26,27,28F, 18,19,20,21,22,23,24,25,26,27,28,29,30Ne, 19,20,21,22,23,24,25,26,27,28,29,30,31Na, 20,21,22,23,24,25,26,27,28,29,30,31,32Mg, 22,23,24,25,26,27,28,29,30,31,32,33,34Si, 23,24,25,26,27,28,29,30,31,32,33,34,35P, 24,25,26,27,28,29,30,31,32,33,34,35,36S, 25,26,27,28,29,30,31,32,33,34,35,36,37Cl, 26,27,28,29,30,31,32,33,34,35,36,37,38Ar, 44Sc, 56Fe, 37K; calculated M1 γ-ray strength functions for 283 nuclei, low-energy enhancements (LEE), total dipole (E1 and M1) strength for 44Sc and 29Si using large-scale shell model. Comparison with experimental data from the Oslo method.

doi: 10.1103/PhysRevC.98.064321
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2018RE15      Phys.Rev. C 98, 054310 (2018)

T.Renstrom, H.Utsunomiya, H.T.Nyhus, A.C.Larsen, M.Guttormsen, G.M.Tveten, D.M.Filipescu, I.Gheorghe, S.Goriely, S.Hilaire, Y.-W.Lui, J.E.Midtbo, S.Peru, T.Shima, S.Siem, O.Tesileanu

Verification of detailed balance for γ absorption and emission in Dy isotopes

NUCLEAR REACTIONS 162,163Dy(γ, n), E=6.4-13.5 MeV laser Compton backscattered γ-ray beam; measured neutron spectra, and σ(E) using 4π 3He proportional counter array for neutron detection at the NewSUBARU synchrotronic radiation facility; deduced renormalized nuclear level densities (NLD), γ-strength functions (γSF). 160,161,162,163,164Dy; deduced γ strength functions, nuclear level densities, E1 γ strength function, and M1 scissors resonance σ, centroids, widths, B(M1). 159,160,161,162,163Dy(n, γ), E=0.001-1 MeV; calculated σ(E) with TALYS-1.8 code, and compared to previous experimental data. 160,161,162,163,164Dy(3He, α), (3He, 3He'), E*<8 MeV; analyzed previous experimental data; deduced level densities.

doi: 10.1103/PhysRevC.98.054310
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2018UT03      Phys.Rev. C 98, 054619 (2018)

H.Utsunomiya, T.Renstrom, G.M.Tveten, S.Goriely, S.Katayama, T.Ari-izumi, D.Takenaka, D.Symochko, B.V.Kheswa, V.W.Ingeberg, T.Glodariu, Y.-W.Lui, S.Miyamoto, A.C.Larsen, J.E.Midtbo, A.Gorgen, S.Siem, L.Crespo Campo, M.Guttormsen, S.Hilaire, S.Peru, A.J.Koning

Photoneutron cross sections for Ni isotopes: Toward understanding (n, γ) cross sections relevant to weak s-process nucleosynthesis

NUCLEAR REACTIONS 58,60,61,64Ni(γ, n), E=8.00-22.02 MeV; measured E(n), I(n), σ(E) using 3He proportional counters for neutrons and LaBr3(Ce) detector for γ-flux at NewSUBARU synchrotron radiation facility; deduced γ-ray strength functions (γSF); compared σ(E) with previous experimental data, and with TALYS predictions. 58,60,63,64(n, γ), E=0.01-10 MeV; calculated radiative σ(E) and Maxwellian averaged σ (MACS) in terms of the experimentally constrained γ-ray strength functions from the Hartree-Fock-Bogolyubov plus quasiparticle-random-phase approximation (HFB+QRPA) based on the Gogny D1M interaction for E1 and M1 components, supplemented with the M1 upbend. Relevance to the s-process nucleosynthesis, and radioactive nuclei at the s-process branching points.

doi: 10.1103/PhysRevC.98.054619
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2017CR04      Phys.Rev. C 96, 014312 (2017)

L.Crespo Campo, A.C.Larsen, F.L.Bello Garrote, T.K.Eriksen, F.Giacoppo, A.Gorgen, M.Guttormsen, M.Klintefjord, T.Renstrom, E.Sahin, S.Siem, T.G.Tornyi, G.M.Tveten

Investigating the γ decay of 65Ni from particle-γ coincidence data

NUCLEAR REACTIONS 64Ni(d, p)65Ni, E=12.5 MeV; measured charged particle spectra Eγ, Iγ, (particle)γ-coin using the Silicon Ring (SiRi) array for particle detection, and CACTUS array of 26 collimated NaI(Tl) detectors for γ detection at Oslo Cyclotron Laboratory (OCL). 65Ni; deduced levels, resonance-like structure centered at ≈4.6 MeV, nuclear level density (NLD) using the constant temperature (CT) and the backshifted Fermi gas (BSFG) models, and the γ-strength function (γSF). Comparison with previous experimental studies.

doi: 10.1103/PhysRevC.96.014312
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2017GU21      Phys.Rev. C 96, 024313 (2017)

M.Guttormsen, S.Goriely, A.C.Larsen, A.Gorgen, T.W.Hagen, T.Renstrom, S.Siem, N.U.H.Syed, G.Tagliente, H.K.Toft, H.Utsunomiya, A.V.Voinov, K.Wikan

Quasicontinuum γ decay of 91, 92Zr: Benchmarking indirect (n, γ) cross section measurements for the s process

NUCLEAR REACTIONS 92Zr(p, d), E=28 MeV; 92Zr(p, p'), E=17 MeV; measured E(p), I(p), E(d), I(d), Eγ, Iγ, (particle)γ-coin, γ-ray multiplicity measured using SiRi array of silicon telescopes for charged particles and CACTUS array of NaI(Tl) detectors for γ rays at Oslo Cyclotron laboratory (OCL). 91,92Zr; deduced levels, J, π, nuclear level densities (NLDs), E1 and M1 γ-ray strength functions (γSF), l=0 resonances. 90,91Zr(n, γ), E=0.001-1 MeV and kT<0.11 MeV; deduced σ(E) and Maxwellian-averaged cross sections using TALYS code on the basis of the experimental NLDs and γSF in the present work, and compared with available experimental data.

doi: 10.1103/PhysRevC.96.024313
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2017KH08      Phys.Rev. C 95, 045805 (2017)

B.V.Kheswa, M.Wiedeking, J.A.Brown, A.C.Larsen, S.Goriely, M.Guttormsen, F.L.Bello Garrote, L.A.Bernstein, D.L.Bleuel, T.K.Eriksen, F.Giacoppo, A.Gorgen, B.L.Goldblum, T.W.Hagen, P.E.Koehler, M.Klintefjord, K.L.Malatji, J.E.Midtbo, H.T.Nyhus, P.Papka, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, T.G.Tornyi

137, 138, 139La (n, γ) cross sections constrained with statistical decay properties of 138, 139, 140La nuclei

NUCLEAR REACTIONS 139La(3He, α), (3He, 3He'), E=38 MeV; 139La(d, p), E=13.5 MeV; measured α, 3He and proton spectra, Eγ, Iγ, αγ-, (3He)γ-, and pγ-coin using SiRi array for particles and CACTUS array for γ rays. 138,139,140La; deduced nuclear level densities (NLDs)and γ-ray strength functions (γSF). Comparison with previous experimental data, and with microscopic calculations using HFB+Comb, Fermi gas (BSFG1+CT) and BSFG2+CT models. 137,138,139La(n, γ), E=0.001-1 MeV; calculated σ(E) with the TALYS reaction code using the measured NLDs and γSFs as inputs, and compared to available experimental data.

doi: 10.1103/PhysRevC.95.045805
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2017LA06      J.Phys.(London) G44, 064005 (2017)

A.C.Larsen, M.Guttormsen, N.Blasi, A.Bracco, F.Camera, L.Crespo Campo, T.K.Eriksen, A.Gorgen, T.W.Hagen, V.W.Ingeberg, B.V.Kheswa, S.Leoni, J.E.Midtbo, B.Million, H.T.Nyhus, T.Renstrom, S.J.Rose, I.E.Ruud, S.Siem, T.G.Tornyi, G.M.Tveten, A.V.Voinov, M.Wiedeking, F.Zeiser

Low-energy enhancement and fluctuations of γ-ray strength functions in 56, 57Fe: test of the Brink-Axel hypothesis

NUCLEAR REACTIONS 56,57Fe(p, pγ), E=16 MeV; measured reaction products, Ep, Ip, Eγ, Iγ; deduced level densities, γ-ray strength functions.

doi: 10.1088/1361-6471/aa644a
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2017RO16      Phys.Rev. C 96, 014601 (2017)

S.J.Rose, F.Zeiser, J.N.Wilson, A.Oberstedt, S.Oberstedt, S.Siem, G.M.Tveten, L.A.Bernstein, D.L.Bleuel, J.A.Brown, L.Crespo Campo, F.Giacoppo, A.Gorgen, M.Guttormsen, K.Hadynska, A.Hafreager, T.W.Hagen, M.Klintefjord, T.A.Laplace, A.C.Larsen, T.Renstrom, E.Sahin, C.Schmitt, T.G.Tornyi, M.Wiedeking

Energy dependence of the prompt γ-ray emission from the (d, p) -induced fission of 234U* and 240Pu*

NUCLEAR REACTIONS 233U(d, pF)234U*, E=12.5 MeV; 239Pu(d, pF)239Pu*, E=12 MeV; measured protons, fission fragments, Eγ, p(one of the fission fragments)γ-coin using CACTUS array for γ detection, SiRi detector array for charged-particles and NIFF detector for fission fragments at Oslo Cyclotron Laboratory (OCL); deduced prompt-fission γ-ray spectral (PFGS) distributions, multiplicity, average γ-ray energy, and total γ-ray energy as function of excitation energy. Comparison with model calculations using the fission model code GEF.

doi: 10.1103/PhysRevC.96.014601
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2017SP03      J.Phys.(London) G44, 044002 (2017)

A.Spyrou, A.C.Larsen, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, M.Guttormsen, D.L.Bleuel, A.Couture, L.Crespo Campo, R.Lewis, S.Mosby, M.R.Mumpower, G.Perdikakis, C.J.Prokop, S.J.Quinn, T.Renstrom, S.Siem, R.Surman

Neutron-capture rates for explosive nucleosynthesis: the case of 68Ni(n, γ)69Ni

RADIOACTIVITY 69Co(β-); measured decay products, Eγ, Iγ; deduced the γ-ray strength function and the nuclear level density, T1/2. Comparison with available data.

doi: 10.1088/1361-6471/aa5ae7
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2016CL01      Phys.Rev.Lett. 116, 022701 (2016)

E.Clement, M.Zielinska, A.Gorgen, W.Korten, S.Peru, J.Libert, H.Goutte, S.Hilaire, B.Bastin, C.Bauer, A.Blazhev, N.Bree, B.Bruyneel, P.A.Butler, J.Butterworth, P.Delahaye, A.Dijon, D.T.Doherty, A.Ekstrom, C.Fitzpatrick, C.Fransen, G.Georgiev, R.Gernhauser, H.Hess, J.Iwanicki, D.G.Jenkins, A.C.Larsen, J.Ljungvall, R.Lutter, P.Marley, K.Moschner, P.J.Napiorkowski, J.Pakarinen, A.Petts, P.Reiter, T.Renstrom, M.Seidlitz, B.Siebeck, S.Siem, C.Sotty, J.Srebrny, I.Stefanescu, G.M.Tveten, J.Van de Walle, M.Vermeulen, D.Voulot, N.Warr, F.Wenander, A.Wiens, H.De Witte, K.Wrzosek-Lipska

Spectroscopic Quadrupole Moments in 96, 98Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N=60

NUCLEAR REACTIONS 109Ag, 120Sn(96Sr, 96Sr'), E=275 MeV;60Ni, 208Pb(98Sr, 98Sr'), E=276 MeV; measured reaction products, Eγ, Iγ. 96,98Sr; deduced B(E2) and B(M1)values, spectroscopic quadrupole moments. Comparison with beyond-mean-field calculations using the Gogny D1S interaction, least squares fitting code GOSIA.

NUCLEAR STRUCTURE 96,98Sr; calculated B(E2) values with the Gogny D1S interaction in a five-dimensional collective Hamiltonian (5DCH) formalism.

doi: 10.1103/PhysRevLett.116.022701
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2016CL03      Phys.Rev. C 94, 054326 (2016)

E.Clement, M.Zielinska, S.Peru, H.Goutte, S.Hilaire, A.Gorgen, W.Korten, D.T.Doherty, B.Bastin, C.Bauer, A.Blazhev, N.Bree, B.Bruyneel, P.A.Butler, J.Butterworth, J.Cederkall, P.Delahaye, A.Dijon, A.Ekstrom, C.Fitzpatrick, C.Fransen, G.Georgiev, R.Gernhauser, H.Hess, J.Iwanicki, D.G.Jenkins, A.C.Larsen, J.Ljungvall, R.Lutter, P.Marley, K.Moschner, P.J.Napiorkowski, J.Pakarinen, A.Petts, P.Reiter, T.Renstrom, M.Seidlitz, B.Siebeck, S.Siem, C.Sotty, J.Srebrny, I.Stefanescu, G.M.Tveten, J.Van de Walle, M.Vermeulen, D.Voulot, N.Warr, F.Wenander, A.Wiens, H.De Witte, K.Wrzosek-Lipska

Low-energy Coulomb excitation of 96, 98Sr beams

NUCLEAR REACTIONS 60Ni, 208Pb(98Sr, 98Sr'), E=276.3 MeV; 109Ag, 120Sn(96Sr, 96Sr'), E=275.5 MeV; measured Eγ, Iγ, scattered Sr ions and target recoils, (particle)γ-coin, γ(θ), differential Coulomb excitation cross sections using Miniball array for γ detection and Si strip detectors for ions at REX-ISOLDE-CERN facility. 96,98Sr; deduced levels, E2 and M1 matrix elements, B(E2) and level half-lives, quadrupole moments and deformation parameters, E0 monopole transition strengths using GOSIA2 analysis. Comparison with previous experimental data and five-dimensional collective Hamiltonian and Gogny D1S force, and using complex excited VAMPIR approach. Systematics of level energies, transitional and spectroscopic quadrupole moments in 94,96Kr, 96,98Sr, 98,100Zr, 100,102Mo. Systematics of energy and B(E2) for first 2+ state, and energies of second 0+ states in 90,92,94,96,98,100,102Sr. 60Ni, 208Pb(98Rb, 98Rb'), E=276 MeV; measured Eγ, Iγ, scattered Rb ions and target recoils, (particle)γ-coin, γ(θ), level half-lives by recoil-distance Doppler shift method. 98Rb; deduced levels.

doi: 10.1103/PhysRevC.94.054326
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2016CR04      Phys.Rev. C 94, 044321 (2016)

L.Crespo Campo, F.L.Bello Garrote, T.K.Eriksen, A.Gorgen, M.Guttormsen, K.Hadynska-Klek, M.Klintefjord, A.C.Larsen, T.Renstrom, E.Sahin, S.Siem, A.Springer, T.G.Tornyi, G.M.Tveten

Statistical γ-decay properties of 64Ni and deduced (n, γ) cross section of the s-process branch-point nucleus 63Ni

NUCLEAR REACTIONS 64Ni(p, p'γ), E=16 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin using SiRi particle-detector system and the CACTUS γ-detection array at Oslo Cyclotron Laboratory; deduced γ-strength function, and nuclear level density by Oslo method. 63Ni(n, γ), E=10 keV to 3 MeV; calculated σ(E) and MACs with TALYS using the level density and γ-strength function in the present work, and comparison with experimental results.

doi: 10.1103/PhysRevC.94.044321
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2016DU18      Phys.Rev. C 94, 024614 (2016)

Q.Ducasse, B.Jurado, M.Aiche, P.Marini, L.Mathieu, A.Gorgen, M.Guttormsen, A.C.Larsen, T.Tornyi, J.N.Wilson, G.Barreau, G.Boutoux, S.Czajkowski, F.Giacoppo, F.Gunsing, T.W.Hagen, M.Lebois, J.Lei, V.Meot, B.Morillon, A.M.Moro, T.Renstrom, O.Roig, S.J.Rose, O.Serot, S.Siem, I.Tsekhanovich, G.M.Tveten, M.Wiedeking

Investigation of the 238U (d, p) surrogate reaction via the simultaneous measurement of γ-decay and fission probabilities

NUCLEAR REACTIONS 238U(d, p)239U*, E=15 MeV; measured particle spectra Eγ, Iγ, (proton)γ- and (proton)(fission events)-coin using ΔE/E silicon telescope SiRi for particles and CACTUS array for γ rays at Oslo Cyclotron Laboratory; corrected data using continuum-discretized coupled channels calculations for elastic breakup, and DWBA for inelastic breakup; deduced excitation energy of 239U versus detected γ-ray energy, ratio between the γ-coincidence and the singles spectra, average angular momentum, γ-decay and fission probabilities as function of excitation energy and compared with JENDL 4.0, ENDF-B/VII.1 and JEFF 3.2 evaluated libraries, and corresponding neutron-induced data; calculated contributions to the total deuteron breakup process (TB) as a function of the excitation energy of 239U. Statistical model calculations for decay probabilities and average angular momentum.

doi: 10.1103/PhysRevC.94.024614
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2016GU03      Phys.Rev.Lett. 116, 012502 (2016)

M.Guttormsen, A.C.Larsen, A.Gorgen, T.Renstrom, S.Siem, T.G.Tornyi, G.M.Tveten

Validity of the Generalized Brink-Axel Hypothesis in 238Np

NUCLEAR REACTIONS 237Np(d, pγ), E not given; analyzed available data; deduced Eγ, Iγ, γ-ray strengths, the validity of generalized Brink-Axel hypothesis.

doi: 10.1103/PhysRevLett.116.012502
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2016KL05      Phys.Rev. C 93, 054303 (2016)

M.Klintefjord, K.Hadynska-Klek, A.Gorgen, C.Bauer, F.L.Bello Garrote, S.Bonig, B.Bounthong, A.Damyanova, J.-P.Delaroche, V.Fedosseev, D.A.Fink, F.Giacoppo, M.Girod, P.Hoff, N.Imai, W.Korten, A.-C.Larsen, J.Libert, R.Lutter, B.A.Marsh, P.L.Molkanov, H.Naidja, P.Napiorkowski, F.Nowacki, J.Pakarinen, E.Rapisarda, P.Reiter, T.Renstrom, S.Rothe, M.D.Seliverstov, B.Siebeck, S.Siem, J.Srebrny, T.Stora, P.Thole, T.G.Tornyi, G.M.Tveten, P.Van Duppen, M.J.Vermeulen, D.Voulot, N.Warr, F.Wenander, H.De Witte, M.Zielinska

Structure of low-lying states in 140Sm studied by Coulomb excitation

NUCLEAR REACTIONS 94Mo(140Sm, 140Sm'), (140Sm, 94Mo'), E=2.85 MeV/nucleon, [secondary 140Sm beam from Ta(p, X), E=1.4 GeV reaction at ISOLDE-CERN using RILIS, REXTRAP and EBIS]; measured scattered 140Sm and 94Mo particles, Eγ, Iγ, (particle)γ-coin, γ-yields using MINIBALL array for γ rays and DSSSD detectors for particle detection, γ spectra with laser on and off, γ-ray angular distributions. 140Sm; deduced E2 matrix elements, B(E2), spectroscopic quadrupole moment for the first two 2+ and the first 4+ states using coupled channel code GOSIA and normalized to γ-ray yield for first 2+ state in 94Mo target, and to known half-life for the first 2+ in 140Sm. Comparison with theoretical calculations using beyond-mean-field model with Gogny D1S interaction, shell model, interacting boson approximation (IBA), and E(5) symmetry. Calculated potential energy surface in (β, γ) plane for 140Sm. 95Mo; measured Iγ yield for 3/2+ to 5/2+ ground-state transition.

doi: 10.1103/PhysRevC.93.054303
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2016LA02      Phys.Rev. C 93, 014323 (2016); Pub.Note Phys.Rev. C 100, 039901 (2019)

T.A.Laplace, F.Zeiser, M.Guttormsen, A.C.Larsen, D.L.Bleuel, L.A.Bernstein, B.L.Goldblum, S.Siem, F.L.Bello Garotte, J.A.Brown, L.C.Campo, T.K.Eriksen, F.Giacoppo, A.Gorgen, K.Hadynska-Klek, R.A.Henderson, M.Klintefjord, M.Lebois, T.Renstrom, S.J.Rose, E.Sahin, T.G.Tornyi, G.M.Tveten, A.Voinov, M.Wiedeking, J.N.Wilson, W.Younes

Statistical properties of 243Pu, and 242Pu(n, γ) cross section calculation

NUCLEAR REACTIONS 242Pu(d, p), E=12 MeV; measured Eγ, particle spectra, (particle)γ-coin using CACTUS γ-spectrometer and SiRi (Silicon Ring) for particle detection at Oslo Cyclotron Laboratory; deduced γ-strength functions (γSF) in the quasicontinuum using the Oslo method, level density, centroid energy, strength and γSF of M1-scissors resonance, sum-rule estimates. 242Pu(n, γ), E=0.001-5 MeV; calculated σ(n, γ) using TALYS and level density and γSF parameters from the present work. Comparison with published data, and ENDF/B-VII.1, JENDL-4.0 and TENDL2014.

doi: 10.1103/PhysRevC.93.014323
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2016LA11      Phys.Rev. C 93, 045810 (2016)

A.C.Larsen, M.Guttormsen, R.Schwengner, D.L.Bleuel, S.Goriely, S.Harissopulos, F.L.Bello Garrote, Y.Byun, T.K.Eriksen, F.Giacoppo, A.Gorgen, T.W.Hagen, M.Klintefjord, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, T.G.Tornyi, G.M.Tveten, A.V.Voinov, M.Wiedeking

Experimentally constrained (p, γ)89Y and (n, γ)59Y reaction rates relevant to p-process nucleosynthesis

NUCLEAR REACTIONS 89Y(p, p'γ), E=17 MeV; measured E(p), I(p), Eγ, Iγ, γ(θ), pγ-coin using silicon ring (SiRi) array for protons and CACTUS array for γ rays at OSLO cyclotron facility; deduced level density, normalized γ-strength function (γSF) of 89Y, enhancement of γSF due to strong, low-energy M1 transitions at high excitation energies. Comparison with shell-model calculations. 88Sr(p, γ)89Y, E=1.5-5 MeV; 88Y(n, γ)89Y, E=0.01-1.5 MeV; deduced cross sections and astrophysical reaction rates using present data and TALYS code. Comparison of cross-section data with values from the BRUSLIB library. Relevance to p-process nucleosynthesis.

doi: 10.1103/PhysRevC.93.045810
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2016LI30      Phys.Rev.Lett. 116, 242502 (2016)

S.N.Liddick, A.Spyrou, B.P.Crider, F.Naqvi, A.C.Larsen, M.Guttormsen, M.Mumpower, R.Surman, G.Perdikakis, D.L.Bleuel, A.Couture, L.C.Campo, A.C.Dombos, R.Lewis, S.Mosby, S.Nikas, C.J.Prokop, T.Renstrom, B.Rubio, S.Siem, S.J.Quinn

Experimental Neutron Capture Rate Constraint Far from Stability

RADIOACTIVITY 70Co(β-) [from 9Be(86Kr, X), E=140 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced nuclear level density as a function of excitation energy. Comparison with available data.

NUCLEAR REACTIONS 69Ni(n, γ), E<10 GK; calculated nuclear reaction capture rates using experimental level densities and code TALYS.

doi: 10.1103/PhysRevLett.116.242502
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2016NE08      Phys.Rev. C 94, 024332 (2016)

D.Negi, M.Wiedeking, E.G.Lanza, E.Litvinova, A.Vitturi, R.A.Bark, L.A.Bernstein, D.L.Bleuel, S.Bvumbi, T.D.Bucher, B.H.Daub, T.S.Dinoko, J.L.Easton, A.Gorgen, M.Guttormsen, P.Jones, B.V.Kheswa, N.A.Khumalo, A.C.Larsen, E.A.Lawrie, J.J.Lawrie, S.N.T.Majola, L.P.Masiteng, M.R.Nchodu, J.Ndayishimye, R.T.Newman, S.P.Noncolela, J.N.Orce, P.Papka, L.Pellegri, T.Renstrom, D.G.Roux, R.Schwengner, O.Shirinda, S.Siem

Nature of low-lying electric dipole resonance excitations in 74Ge

NUCLEAR REACTIONS 74Ge(α, α'), E=48 MeV; measured Eγ, Iγ, Eα, αγ-coin, γ(θ), σ(θ) for scattered α particles, relative cross sections of E1 transitions using AFRODITE array for γ detection and silicon detectors for α particles at iThemba Labs cyclotron facility. 74Ge; deduced levels, J, π, B(E1), suppression in relative cross section for the excitation of pygmy-dipole resonances (PDR) as compared to those in (γ, γ') data for excitations above 6 MeV. Comparison of B(E1) with relativistic quasiparticle time blocking approximation (RQTBA) calculations.

doi: 10.1103/PhysRevC.94.024332
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Data from this article have been entered in the XUNDL database. For more information, click here.


2016RE13      Phys.Rev. C 93, 064302 (2016)

T.Renstrom, H.-T.Nyhus, H.Utsunomiya, R.Schwengner, S.Goriely, A.C.Larsen, D.M.Filipescu, I.Gheorghe, L.A.Bernstein, D.L.Bleuel, T.Glodariu, A.Gorgen, M.Guttormsen, T.W.Hagen, B.V.Kheswa, Y.-W.Lui, D.Negi, I.E.Ruud, T.Shima, S.Siem, K.Takahisa, O.Tesileanu, T.G.Tornyi, G.M.Tveten, M.Wiedeking

Low-energy enhancement in the γ-ray strength functions of 73, 74Ge

NUCLEAR REACTIONS 74Ge(3He, 3He), (3He, α), E=38 MeV; measured Eγ, Iγ, (particle)γ-coin using SiRi particle detector array and CACTUS array for γ detection at Oslo Cyclotron Laboratory (OCL) facility. 74Ge(γ, n), E=10.4-12.7 MeV; measured E(n), I(n), σ(E) using 4π neutron detection array at NewSUBARU synchrotron radiation facility. 73,74Ge, deduced γ-strength functions (γSF), nuclear level densities (NLD). Comparison with shell-model calculations. 72,73Ge(n, γ), E=0.001-3 MeV; deduced experimentally constrained σ(E), and compared with TALYS calculations for E1 and M1 radiations.

doi: 10.1103/PhysRevC.93.064302
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2612.


2016SP04      Phys.Rev.Lett. 117, 142701 (2016)

A.Spyrou, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, D.L.Bleuel, B.A.Brown, A.Couture, L.Crespo Campo, M.Guttormsen, A.C.Larsen, R.Lewis, P.Moller, S.Mosby, M.R.Mumpower, G.Perdikakis, C.J.Prokop, T.Renstrom, S.Siem, S.J.Quinn, S.Valenta

Strong Neutron-γ Competition above the Neutron Threshold in the Decay of 70Co

RADIOACTIVITY 70Co(β-) [9Be(86Kr, X)70Co, E=140 MeV/nucleon]; measured decay products, Eβ, Iβ, Eγ, Iγ; deduced β-decay intensity, the large fragmentation of the β intensity at high energies, as well as the strong competition between γ-rays and neutrons. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.117.142701
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2016TV01      Phys.Rev. C 94, 025804 (2016)

G.M.Tveten, A.Spyrou, R.Schwengner, F.Naqvi, A.C.Larsen, T.K.Eriksen, F.L.Bello Garrote, L.A.Bernstein, D.L.Bleuel, L.Crespo Campo, M.Guttormsen, F.Giacoppo, A.Gorgen, T.W.Hagen, K.Hadynska-Klek, M.Klintefjord, B.S.Meyer, H.T.Nyhus, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, T.G.Tornyi

Completing the nuclear reaction puzzle of the nucleosynthesis of 92Mo

NUCLEAR REACTIONS 92Mo(p, p'), E=16.5 MeV; measured Ep, Ip, Eγ, Iγ pγ-coin, angular distributions using SiRi silicon ΔE-E telescopes for protons and CACTUS scintillator detector array for γ rays at Oslo Cyclotron Laboratory; deduced nuclear level density (NLD) and γ-strength function (γSF) of 92Mo. 91Nb(p, γ)92Mo, T9=1.8-3.5; deduced astrophysical reaction rates using TALYS 1.6 code and NLD and γSF input from present experiment; discussed puzzle of the nucleosynthesis of 92Mo in the context of p process. Comparison with previous experimental results from 92Mo(γ, γ') and 92,94,95,96Mo(γ, n) reactions, and shell model calculations.

doi: 10.1103/PhysRevC.94.025804
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2015GI02      Phys.Rev. C 91, 054327 (2015)

F.Giacoppo, F.L.Bello Garrote, L.A.Bernstein, D.L.Bleuel, R.B.Firestone, A.Gorgen, M.Guttormsen, T.W.Hagen, M.Klintefjord, P.E.Koehler, A.C.Larsen, H.T.Nyhus, T.Renstrom, E.Sahin, S.Siem, T.Tornyi

γ decay from the quasicontinuum of 197, 198Au

NUCLEAR REACTIONS 197Au(d, p), E=12.5 MeV; 197Au(3He, 3He'), E=34.0 MeV; measured Eγ, Iγ, particle spectra, (particle)γ-coin using CACTUS spectrometer for γ rays and SiRi (Silicon Ring) for particle detection at Oslo Cyclotron Laboratory; deduced γ strength functions, level density, spin cutoff distributions as function of excitation energy, σ(E) for 197Au(n, γ). Comparison with (γ, n) experimental results, and with theoretical calculations using EGLO model with four SLO components, and QRPA.

doi: 10.1103/PhysRevC.91.054327
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2015GU27      Eur.Phys.J. A 51, 170 (2015)

M.Guttormsen, M.Aiche, F.L.Bello Garrote, L.A.Bernstein, D.L.Bleuel, Y.Byun, Q.Ducasse, T.K.Eriksen, F.Giacoppo, A.Gorgen, F.Gunsing, T.W.Hagen, B.Jurado, M.Klintefjord, A.C.Larsen, L.Lebois, B.Leniau, H.T.Nyhus, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, T.G.Tornyi, G.M.Tveten, A.Voinov, M.Wiedeking, J.Wilson

Experimental level densities of atomic nuclei

doi: 10.1140/epja/i2015-15170-4
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2015KH02      Phys.Lett. B 744, 268 (2015)

B.V.Kheswa, M.Wiedeking, F.Giacoppo, S.Goriely, M.Guttormsen, A.C.Larsen, F.L.Bello Garrote, T.K.Eriksen, A.Gorgen, T.W.Hagen, P.E.Koehler, M.Klintefjord, H.T.Nyhus, P.Papka, T.Renstrom, S.Rose, E.Sahin, S.Siem, T.Tornyi

Galactic production of 138La: Impact of 138, 139La statistical properties

NUCLEAR REACTIONS 139La(3He, X)138La/139La, E=38 MeV; measured reaction products, Eγ, Iγ; deduced σ, γ-ray strength functions, nuclear level densities, Maxwellian-averaged σ. Comparison with available data.

doi: 10.1016/j.physletb.2015.03.065
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2015KL01      Acta Phys.Pol. B46, 607 (2015)

M.Klintefjord, K.Hadynska-Klek, J.Samorajczyk, A.Gorgen, Ch.Droste, J.Srebrny, T.Abraham, C.Bauer, F.L.Bello Garrote, S.Bonig, A.Damyanova, F.Giacoppo, E.Grodner, P.Hoff, M.Kisielinski, M.Komorowska, W.Korten, M.Kowalczyk, J.Kownacki, A.C.Larsen, R.Lutter, T.Marchlewski, P.Napiorkowski, J.Pakarinen, E.Rapisarda, P.Reiter, T.Renstrom, B.Siebeck, S.Siem, A.Stolarz, R.Szenborn, P.Thole, T.Tornyi, A.Tucholski, G.M.Tveten, P.Van Duppen, M.J.Vermeulen, N.Warr, H.De Witte, M.Zielinska

Spectroscopy of Low-lying States in 140Sm

NUCLEAR REACTIONS 94Mo(140Sm, 140Sm'), E=2.85 MeV/nucleon; measured reaction products, Eγ, Iγ. 140Sm; deduced energy levels, J, π, angular correlation coefficients, B(E2). GOSIA analysis.

doi: 10.5506/APhysPolB.46.607
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2015LA08      Acta Phys.Pol. B46, 509 (2015)

A.C.Larsen, S.Goriely, L.A.Bernstein, D.L.Bleuel, A.Bracco, B.A.Brown, F.Camera, T.K.Eriksen, S.Frauendorf, F.Giacoppo, M.Guttormsen, A.Gorgen, S.Harissopulos, S.Leoni, S.N.Liddick, F.Naqvi, H.T.Nyhus, S.J.Rose, T.Renstrom, R.Schwengner, S.Siem, A.Spyrou, G.M.Tveten, A.V.Voinov, M.Wiedeking

Upbend and M1 Scissors Mode in Neutron-rich Nuclei - Consequences for r-process (n, γ) Reaction Rates

doi: 10.5506/APhysPolB.46.509
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2015NY01      Phys.Rev. C 91, 015808 (2015)

H.-T.Nyhus, T.Renstrom, H.Utsunomiya, S.Goriely, D.M.Filipescu, I.Gheorghe, O.Tesileanu, T.Glodariu, T.Shima, K.Takahisa, S.Miyamoto, Y.-W.Lui, S.Hilaire, S.Peru, M.Martini, L.Siess, A.J.Koning

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of (γ, n) and (n, γ) reactions in the rare earth region

NUCLEAR REACTIONS 143,144,145,146,148Nd(γ, n), E=7.55-13.00 MeV laser Compton scattered (LCS) rays; measured neutron spectra, σ(E) at GACKO (Gamma Collaboration Hutch of Konan University) using SUBARU synchrotron radiation facility; deduced σ(E) for 147Nd(n, γ) by combining present (γ, n) data with existing (n, γ) data for 142,143,144,145,146,148Nd(n, γ), and using γ-SF method. Comparison of σ(E) for 147Nd(n, γ) with JENDL-4.0, ENDF/B-VII.1, and ROSFOND-2010 evaluated libraries. Comparison with predictions of Skyrme-Fock-Bogoliubov (HFB) plus quasiparticle random phase approximation (QRPA) model, and axially symmetric-deformed Gogny HFB plus QRPA model of E1 γ-ray strength using TALYS code. Comparison with previous experimental data.

doi: 10.1103/PhysRevC.91.015808
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2478.


2014DU11      Nucl.Data Sheets 119, 233 (2014)

Q.Ducasse, B.Jurado, M.Aiche, L.Mathieu, T.Tornyi, A.Gorgen, J.N.Wilson, G.Barreau, I.Companis, S.Czajkowski, F.Giacoppo, F.Gunsing, M.Guttormsen, A.C.Larsen, M.Lebois, J.Matarranz, T.Renstrom, S.Rose, S.Siem, I.Tsekhanovich, G.M.Tveten, T.W.Hagen, M.Wiedeking, O.Serot, G.Boutoux, P.Chau, V.Meot, O.Roig

Neutron-induced Cross Sections of Actinides via the Surrogate-reaction Method

NUCLEAR REACTIONS 238U(d, p), E=15 MeV;238U(3He, t), (3He, α), E=24 MeV; measured ejectiles, fission fragments, coincidences using SiRi detector and PPAC fission detectors, Eγ, Iγ using NaI CACTUS detectors. 238U(n, F), E*=5.55-7.25 MeV; deduced fission probability. 238U(n, γ), E*=4.65-5.9 MeV; deduced γ-decay probability using surrogate method. 238U(n, F), E*=4.8-7.25 MeV; calculated fission probability using TALYS. Preliminary. Fission probability compared with results of Cramer and Britt. Further analysis in progress.

doi: 10.1016/j.nds.2014.08.064
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2014ER04      Phys.Rev. C 90, 044311 (2014)

T.K.Eriksen, H.T.Nyhus, M.Guttormsen, A.Gorgen, A.C.Larsen, T.Renstrom, I.E.Ruud, S.Siem, H.K.Toft, G.M.Tveten, J.N.Wilson

Pygmy resonance and low-energy enhancement in the γ-ray strength functions of Pd isotopes

NUCLEAR REACTIONS 106,108Pd(3He, 3He'), (3He, α), E=38 MeV; measured Eγ, Iγ, particle spectra, (particle)γ-coin using SiRi particle telescope and CACTUS γ-detector array at Oslo cyclotron facility. 105,106,107,108Pd; deduced level densities, γ-ray strength functions, pygmy dipole resonances (PDR) at E(-γ)=8 MeV, low-energy enhancement of the strength function for 105Pd as compared to the low-energy tail of the giant dipole resonance (GDR), and neutron number dependency of the PDR strength. Comparison with results from (γ, n) data.

doi: 10.1103/PhysRevC.90.044311
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2014FI17      Phys.Rev. C 90, 064616 (2014)

D.M.Filipescu, I.Gheorghe, H.Utsunomiya, S.Goriely, T.Renstrom, H.-T.Nyhus, O.Tesileanu, T.Glodariu, T.Shima, K.Takahisa, S.Miyamoto, Y.-W.Lui, S.Hilaire, S.Peru, M.Martini, A.J.Koning

Photoneutron cross sections for samarium isotopes: Toward a unified understanding of (γ, n) and (n, γ) reactions in the rare earth region

NUCLEAR REACTIONS 144,147,148,149,150,152,154Sm(γ, n), E=6-17 MeV; measured E(n), I(n), monochromatic and nonmonochromatic σ(E). Comparison with previous experimental results, and predictions from Skyrme HFB+QRPA using BSk7 interaction, and axially deformed Gogny HFB+QRPA models using D1M interaction. 147,148,149,150,151,152Sm(n, γ), E=0.001-1 MeV; analyzed measured σ(E) with a TALYS calculation using D1M+QRPA calculation for the E1 strength function. 153Sm(n, γ), E=0.001-1 MeV; predicted σ(E) from TALYS calculations using γ-strength function (γSF) approach. Comparison with evaluated libraries JENDL-4.0, ENDF/B-VII.1, ROSFOND-2010.

doi: 10.1103/PhysRevC.90.064616
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2472.


2014GI08      Phys.Rev. C 90, 054330 (2014)

F.Giacoppo, F.L.Bello Garrote, L.A.Bernstein, D.L.Bleuel, T.K.Eriksen, R.B.Firestone, A.Gorgen, M.Guttormsen, T.W.Hagen, B.V.Kheswa, M.Klintefjord, P.E.Koehler, A.C.Larsen, H.T.Nyhus, T.Renstrom, E.Sahin, S.Siem, T.Tornyi

Level densities and thermodynamical properties of Pt and Au isotopes

NUCLEAR REACTIONS 195Pt(d, p), (p, p'), (p, d), E=11.3, 16.5 MeV; 197Au(d, p), (d, d'), E=12.5 MeV; 197Au(3He, 3He'), E=34.0 MeV; measured Eγ, Iγ, particle spectra, (particle)γ-coin using SiRi particle detector array and CACTUS multidetector array for γ rays at Oslo cyclotron facility. 194,195,196Pt, 197,198Au; deduced level densities from the population of excited states below S(n), density as function of temperature, single-particle level space for the last unpaired valence neutron, heat capacity and temperature, evidence of consecutive breaking of nucleon Cooper pairs in the heated nuclear system.

doi: 10.1103/PhysRevC.90.054330
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2014GU04      Phys.Rev. C 89, 014302 (2014)

M.Guttormsen, L.A.Bernstein, A.Gorgen, B.Jurado, S.Siem, M.Aiche, Q.Ducasse, F.Giacoppo, F.Gunsing, T.W.Hagen, A.C.Larsen, M.Lebois, B.Leniau, T.Renstrom, S.J.Rose, T.G.Tornyi, G.M.Tveten, M.Wiedeking, J.N.Wilson

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

NUCLEAR REACTIONS 232Th(d, d'), (d, p), E=12 MeV; 232Th(3He, 3He'), (3He, d), (3He, t), (3He, α), E=24 MeV; 238U(d, d'), (d, p), (d, t), E=15 MeV; measured Eγ, Iγ, particle spectra, (particle)γ-coin using SiRi particle telescope and CACTUS γ-detector array at Oslo cyclotron facility. 231,232,233Th, 232,233Pa, 237,238,239U; deduced γ strength functions in the quasicontinuum, low-energy M1 scissors resonance (SR), level densities using Oslo method Comparison with previous (γ, γ') experimental results, and with theoretical model calculations.

doi: 10.1103/PhysRevC.89.014302
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2014GU21      Phys.Rev. C 90, 044309 (2014)

M.Guttormsen, A.C.Larsen, F.L.Bello Garrote, Y.Byun, T.K.Eriksen, F.Giacoppo, A.Gorgen, T.W.Hagen, M.Klintefjord, H.T.Nyhus, T.Renstrom, S.J.Rose, E.Sahin, S.Siem, T.Tornyi, G.M.Tveten, A.Voinov

Shell-gap-reduced level densities in 89, 90Y

NUCLEAR REACTIONS 89Y(p, p'), E=17 MeV; 89Y(d, p), E=11 MeV; measured Eγ, Iγ, γγ-coin, particle-γ-coin using CACTUS array at Oslo cyclotron laboratory. 89,90Y; deduced shell-gap-reduced level densities using Oslo method; calculated single-particle orbitals using Nilsson model, proton and neutron quasi-particle energies and pair breaking number, parity asymmetries. Comparison with combinatorial quasiparticle model, and temperature dependent combinatorial model with the D1M Gogny force (TDCG). Systematics of level densities for N=46-56 Sr, Y and Zr nuclei.

doi: 10.1103/PhysRevC.90.044309
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2014SP05      Phys.Rev.Lett. 113, 232502 (2014)

A.Spyrou, S.N.Liddick, A.C.Larsen, M.Guttormsen, K.Cooper, A.C.Dombos, D.J.Morrissey, F.Naqvi, G.Perdikakis, S.J.Quinn, T.Renstrom, J.A.Rodriguez, A.Simon, C.S.Sumithrarachchi, R.G.T.Zegers

Novel technique for Constraining r-Process (n, γ) Reaction Rates

RADIOACTIVITY 76Ga(β-) [from Be(76Ge, X), E=130 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced nuclear level density and γ-ray strength function, restrictions on 75Ge(n, γ) reaction σ and rate. Hauser-Feshbach calculations.

doi: 10.1103/PhysRevLett.113.232502
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2014TO07      Phys.Rev. C 89, 044323 (2014)

T.G.Tornyi, M.Guttormsen, T.K.Eriksen, A.Gorgen, F.Giacoppo, T.W.Hagen, A.Krasznahorkay, A.C.Larsen, T.Renstrom, S.J.Rose, S.Siem, G.M.Tveten

Level density and γ-ray strength function in the odd-odd 238Np nucleus

NUCLEAR REACTIONS 237Np(d, pγ), E=13.5 MeV; measured Eγ, Iγ, γγ-coin, (particle)γ-coin, using SiRi particle telescope and CACTUS γ-detector system at Oslo Cyclotron Laboratory; deduced quasicontinuum using the Oslo method. 238Np; deduced γ multiplicity as function of excitation energy, quasicontinuum, level density, γ-ray strength function, scissor resonance parameter using OSLO method. 237Np(n, γ)238Np, E=10 eV-1 MeV; deduced σ(E) using level density and γ SF models corresponding to data in current work. Comparison with TALYS calculations and previous experimental data.

doi: 10.1103/PhysRevC.89.044323
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2196.


2013GU10      Acta Phys.Pol. B44, 567 (2013)

M.Guttormsen, L.A.Bernstein, A.Burger, A.Gorgen, F.Gunsing, T.W.Hagen, A.C.Larsen, T.Renstrom, S.Siem, M.Wiedeking, J.N.Wilson

Observation of Large Orbital Scissors Strength in Actinides

NUCLEAR REACTIONS 232Th(d, pγ)233Th, E=12 MeV; 232Th(3He, X), E=24 MeV; measured reaction products, Eγ, Iγ. 231,232,233Th, 232,233Pa; deduced scissors mode parameters, M1-scissors resonance, B(M1), increased γ-decay probability. Comparison with available data.

doi: 10.5506/APhysPolB.44.567
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2013GU27      Phys.Rev. C 88, 024307 (2013)

M.Guttormsen, B.Jurado, J.N.Wilson, M.Aiche, L.A.Bernstein, Q.Ducasse, F.Giacoppo, A.Gorgen, F.Gunsing, T.W.Hagen, A.C.Larsen, M.Lebois, B.Leniau, T.Renstrom, S.J.Rose, S.Siem, T.Tornyi, G.M.Tveten, M.Wiedeking

Constant-temperature level densities in the quasicontinuum of Th and U isotopes

NUCLEAR REACTIONS 232Th(d, p), (d, d'), (d, t), E=12 MeV; 232Th(3He, 3He'), (3He, α), E=24 MeV; 238U(d, p), (d, d'), (d, t), E=15 MeV; measured (particle)γ-coin in the quasicontinuum region using SiRi particle detector array and CACTUS-γ detector system at Oslo cyclotron laboratory; deduced excitation energy vs Eγ distributions. 231,232,233Th, 237,238,239U; deduced level densities using the Oslo method, increase in level density for odd-A isotopes as compared to even-even isotopes, similar temperatures in the quasicontinuum. 237,238,239U; deduced entropy, excess of entropy for odd-A isotopes as compared to even-even neighbor, microcanonical temperature, heat capacity. Evidence for continuous melting of Cooper pairs from constant temperature behavior.

doi: 10.1103/PhysRevC.88.024307
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2013LA03      Phys.Rev. C 87, 014319 (2013)

A.C.Larsen, I.E.Ruud, A.Burger, S.Goriely, M.Guttormsen, A.Gorgen, T.W.Hagen, S.Harissopulos, H.T.Nyhus, T.Renstrom, A.Schiller, S.Siem, G.M.Tveten, A.Voinov, M.Wiedeking

Transitional γ strength in Cd isotopes

NUCLEAR REACTIONS 106,112Cd(3He, α), (3He, 3He'), E=38 MeV; measured Eγ, Iγ, particle spectra, (particle)γ-coin using SiRi and CACTUS arrays at Oslo Cyclotron Laboratory. 105,106,111,112Cd; deduced level densities, γ-ray strength function. Comparisons with GLO model calculations, and with results of photonuclear reactions. Pygmy resonances. Effect of neutron skin oscillations or the spin-flip resonance.

doi: 10.1103/PhysRevC.87.014319
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2148.


2013LA09      Acta Phys.Pol. B44, 563 (2013)

A.C.Larsen, A.Burger, S.Goriely, M.Guttormsen, A.Gorgen, T.K.Eriksen, T.W.Hagen, S.Harissopulos, H.T.Nyhus, T.Renstrom, S.Rose, I.E.Ruud, A.Schiller, S.Siem, G.M.Tveten, A.Voinov

Astrophysical Reaction Rates and the Low-energy Enhancement in the γ Strength

COMPILATION 95Mo, Ti, Sc, V, Fe, Mo, Cd; compiled γ-strength functions.

doi: 10.5506/APhysPolB.44.563
Citations: PlumX Metrics


2013LA35      Phys.Rev.Lett. 111, 242504 (2013)

A.C.Larsen, N.Blasi, A.Bracco, F.Camera, T.K.Eriksen, A.Gorgen, M.Guttormsen, T.W.Hagen, S.Leoni, B.Million, H.T.Nyhus, T.Renstrom, S.J.Rose, I.E.Ruud, S.Siem, T.Tornyi, G.M.Tveten, A.V.Voinov, M.Wiedeking

Evidence for the Dipole Nature of the Low-Energy γ Enhancement in 56Fe

NUCLEAR REACTIONS 56Fe(p, X), E=16 MeV; measured reaction products, Eγ, Iγ. 13C, 16,17O, 28Si, 56,57Fe; deduced γ-ray strength function, σ(θ) for the high-energy γ-rays. Comparison with available data.

doi: 10.1103/PhysRevLett.111.242504
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Data from this article have been entered in the XUNDL database. For more information, click here.


2012GU21      Phys.Rev.Lett. 109, 162503 (2012)

M.Guttormsen, L.A.Bernstein, A.Burger, A.Gorgen, F.Gunsing, T.W.Hagen, A.C.Larsen, T.Renstrom, S.Siem, M.Wiedeking, J.N.Wilson

Observation of Large Scissors Resonance Strength in Actinides

NUCLEAR REACTIONS 232Th(3He, α), (3He, t), (3He, d), E=24 MeV;232Th(d, d), (d, p), E=12 MeV; measured reaction products; deduced radiative strength functions, M1 scissors resonance. Comparison with available data, theoretical calculations.

doi: 10.1103/PhysRevLett.109.162503
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2012WI03      Phys.Rev. C 85, 034607 (2012)

J.N.Wilson, F.Gunsing, L.A.Bernstein, A.Burger, A.Gorgen, M.Guttormsen, A.-C.Larsen, P.Mansouri, T.Renstrom, S.J.Rose, A.Semchenkov, S.Siem, N.U.H.Syed, H.K.Toft, M.Wiedeking, T.Wiborg-Hagen

Indirect (n, γ) cross sections of thorium cycle nuclei using the surrogate method

NUCLEAR REACTIONS 232Th(d, p)233Th, E=12 MeV; 232Th(3He, t)232Pa, 232Th(3He, α)231Th, E=24 MeV; measured energy loss, E(particle), I(particle), Eγ, Iγ, γ(fragment)-coin using CACTUS γ-detector array, and Silicon Ring charged-particle detector at Oslo Cyclotron Laboratory; deduced γ decay probabilities. 230,232Th, 231Pa(n, γ), E<1.4 MeV; deduced cross sections using surrogate ratio method. Comparison with evaluated data libraries. Optical model calculations of compound nucleus formation cross sections, and weighting function technique.

doi: 10.1103/PhysRevC.85.034607
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset23165.


2011TO03      Phys.Rev. C 83, 044320 (2011)

H.K.Toft, A.C.Larsen, A.Burger, M.Guttormsen, A.Gorgen, H.T.Nyhus, T.Renstrom, S.Siem, G.M.Tveten, A.Voinov

Evolution of the pygmy dipole resonance in Sn isotopes

NUCLEAR REACTIONS 122Sn(3He, 3He'), (3He, α), E=34 MeV; measured Eγ, Iγ, (particle)γ-coin, continuum γ spectra using Oslo method. 121,122Sn; deduced γ-ray strength functions, level densities, pygmy resonances. Comparison with experimental data for 113,115,116,117,118,119,120Sn, and model calculations.

doi: 10.1103/PhysRevC.83.044320
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO1920.


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