NSR Query Results
Output year order : Descending NSR database version of April 11, 2024. Search: Author = B.V.Kheswa Found 31 matches. 2023KH12 Acta Phys.Pol. B54, 8-A1 (2023) The Rigorous Test of the Generalized Brink-Axel Hypothesis in the A = A Nuclear Mass Region NUCLEAR STRUCTURE 138La; analyzed available data; deduced γ-ray strength functions and its dependence on the initial and final excitation energy levels. The modification of the well-known Oslo Method.
doi: 10.5506/APhysPolB.54.8-A1
2023KH14 Acta Phys.Pol. B54, 10-A1 (2023) The Thermodynamic Properties of 138, 139La Nuclear Systems NUCLEAR STRUCTURE 138,139La; calculated entropy excess due to the unpaired neutron, nuclear temperature, heat capacity using the experimental nuclear-level density data.
doi: 10.5506/APhysPolB.54.10-A1
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
2023RA04 Nucl.Phys. A1032, 122622 (2023) Y.Rahma, S.Ouichaoui, J.Kiener, E.A.Lawrie, J.J.Lawrie, V.Tatischeff, A.Belhout, D.Moussa, W.Yahia-Cherif, H.Benhabiles-Mezhoud, T.D.Bucher, T.R.S.Dinoko, A.Chafa, J.L.Conradie, S.Damache, M.Debabi, I.Deloncle, J.L.Easton, M.Fouka, C.Hamadache, F.Hammache, P.Jones, B.V.Kheswa, N.A.Khumalo, T.Lamula, S.N.T.Majola, J.Ndayishimye, D.Negi, S.P.Noncolela, S.Ouziane, P.Papka, S.Peterson, M.Kumar Raju, V.Ramanathan, B.M.Rebeiro, N.de Sereville, J.F.Sharpey-Schafer, O.Shirinda, M.Wiedeking, S.Wyngaardt γ-ray emission in proton-induced nuclear reactions on natC and Mylar targets over the incident energy range, Ep = 30 - 200 MeV. Astrophysical implications NUCLEAR REACTIONS 12C, 16O, 24Mg, 28Si, 56Fe(p, X), E=30-200 MeV; measured reaction products; deduced γ-ray production σ. The K = 200 separated sector cyclotron of iThemba LABS using a high-energy resolution, high-efficiency detection array composed of 8 Compton-suppressed clover detectors comprising 32 HP-Ge crystals for recording the γ-ray energy spectra.
doi: 10.1016/j.nuclphysa.2023.122622
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
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
2022MU09 Phys.Lett. B 827, 137006 (2022) L.Mu, S.Y.Wang, C.Liu, B.Qi, R.A.Bark, J.Meng, S.Q.Zhang, P.Jones, S.M.Wyngaardt, H.Jia, Q.B.Chen, Z.Q.Li, S.Wang, D.P.Sun, R.J.Guo, X.C.Han, W.Z.Xu, X.Xiao, P.Y.Zhu, H.W.Li, H.Hua, X.Q.Li, C.G.Li, R.Han, B.H.Sun, L.H.Zhu, T.D.Bucher, B.V.Kheswa, N.Khumalo, E.A.Lawrie, J.J.Lawrie, K.L.Malatji, L.Msebi, J.Ndayishimye, J.F.Sharpey-Schafer, O.Shirinda, M.Wiedeking, T.Dinoko, S.S.Ntshangase First observation of the coexistence of multiple chiral doublet bands and pseudospin doublet bands in the A ≈ 80 mass region NUCLEAR REACTIONS 82Se(α, X)81Kr, E=65, 68 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, two nearly degenerate positive-parity bands. Comparison with the constrained covariant density functional theory and the multiparticle plus rotor model calculations.
doi: 10.1016/j.physletb.2022.137006
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
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
2020IN01 Eur.Phys.J. A 56, 68 (2020) V.W.Ingeberg, S.Siem, M.Wiedeking, K.Sieja, D.L.Bleuel, C.P.Brits, T.D.Bucher, 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, K.L.Malatji, L.Makhathini, B.Maqabuka, D.Negi, S.P.Noncolela, P.Papka, E.Sahin, R.Schwengner, G.M.Tveten, F.Zeiser, B.R.Zikhali First application of the Oslo method in inverse kinematics
doi: 10.1140/epja/s10050-020-00070-7
2020MA16 Phys.Rev. C 101, 044312 (2020) S.N.T.Majola, M.A.Sithole, L.Mdletshe, D.Hartley, J.Timar, B.M.Nyako, J.M.Allmond, R.A.Bark, C.Beausang, L.Bianco, T.D.Bucher, S.P.Bvumbi, M.P.Carpenter, C.J.Chiara, N.Cooper, D.M.Cullen, D.Curien, T.S.Dinoko, B.J.P.Gall, P.E.Garrett, P.T.Greenlees, J.Hirvonen, U.Jakobsson, P.M.Jones, R.Julin, S.Juutinen, S.Ketelhut, B.V.Kheswa, F.G.Kondev, A.Korichi, W.D.Kulp, T.Lauritsen, E.A.Lawrie, L.Makhathini, P.L.Masiteng, B.Maqabuka, E.A.McCutchan, D.Miller, S.Miller, A.Minkova, L.Msebi, S.H.Mthembu, J.Ndayishimye, P.Nieminen, P.Z.Ngcobo, S.S.Ntshangase, J.N.Orce, P.Peura, P.Rahkila, N.Redon, L.L.Riedinger, M.A.Riley, D.G.Roux, P.Ruotsalainen, J.Piot, J.Saren, J.F.Sharpey-Schafer, C.Scholey, O.Shirinda, J.Simpson, J.Sorri, I.Stefanescu, S.Stolze, J.Uusitalo, X.Wang, V.Werner, J.L.Wood, C.-H.Yu, S.Zhu, G.Zimba First candidates for γ vibrational bands built on the [505] 11/2- neutron orbital in odd-A Dy isotopes NUCLEAR REACTIONS 155Gd(α, 2n)157Dy, E=25 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization) using the JUROGAM II array at the University of Jyvaskyla. 148Nd(12C, 5n)155Dy, E=65 MeV; 124Sn(36S, 5n)155Dy, E=165 MeV; measured Eγ, Iγ, γγ-coin using GAMMASPHERE array at Argonne National Laboratory. 155,157Dy; deduced high-spin levels, J, π, multipolarities, Kπ=0+ bands, Kπ=2+ γ-vibrational bands, configurations, alignments, B(M1)/B(E2) ratios. 157Dy; calculated neutron quasiparticle Routhians using cranked shell model (CSM). 154,156Dy; discussed first excited 0+ states in the core nuclei. Systematics of level energies versus spin for γ bands in 154,155,156,157,158Dy and 152,153,154,155,156Gd.
doi: 10.1103/PhysRevC.101.044312
2020YA21 Phys.Rev. C 102, 025802 (2020) W.Yahia-Cherif, S.Ouichaoui, J.Kiener, E.A.Lawrie, J.J.Lawrie, V.Tatischeff, A.Belhout, D.Moussa, P.Papka, H.Benhabiles-Mezhoud, T.D.Bucher, A.Chafa, J.L.Conradie, S.Damache, M.Debabi, I.Deloncle, J.L.Easton, C.Hamadache, F.Hammache, P.Jones, B.V.Kheswa, N.A.Khumalo, T.Lamula, S.N.T.Majola, J.Ndayishimye, D.Negi, S.P.Noncolela, N.de Sereville, J.F.Sharpey-Schafer, O.Shirinda, M.Wiedeking, S.Wyngaardt Measurement and analysis of nuclear γ-ray production cross sections in proton interactions with Mg, Si, and Fe nuclei abundant in astrophysical sites over the incident energy range E=30-66 MeV NUCLEAR REACTIONS 24Mg(p, n), (p, 3He), (p, p'), (p, d), (p, 2p), (p, α), (p, p3He), 25Mg(p, 2n), (p, p'), (p, d), (p, α), (p, t), (p, 2p), (p, 3He), (p, nα), (p, pα), 26Mg(p, 3n), (p, p'), (p, d), (p, nα), (p, t), (p, nt), (p, α), (p, nα), (p, 3He), (p, 2nα), (p, dα), 28Si(p, p'), (p, d), (p, 2p), (p, 3He), (p, p3He), (p, 2pα), (p, pα), (p, dα), (p, 2α), (p, pα3He), 29Si(p, p'), (p, d), (p, t), (p, pd), (p, α), (p, pα), (p, α3He), (p, dα), (p, tα), (p, n2α), (p, p2α), 30Si(p, d), (p, t), (p, nt), (p, α), (p, nα), (p, npα), (p, 2α), (p, tα), (p, 2α), (p, ntα), (p, 2n2α), (p, d2α), 56Fe(p, p'), (p, t), (p, d), (p, 3He), (p, α), (p, pα), E=30, 42, 54, 66 MeV; measured Eγ, Iγ, γ(θ), integrated γ-ray cross sections using natural and enriched targets and AFRODITE array with eight Compton-suppressed HPGe clover detectors at the Separated Sector Cyclotron (SSC) of iThemba LABS; deduced angular distribution coefficients and multipolarities of γ-ray transitions, branching ratios and assignments to levels in product nuclei. Comparison to theoretical predictions using the code TALYS, with modified optical model potential (OMP) parameters deformation parameters, and level density parameters. 24Mg(p, p'), E=49.5 MeV; 28Si(p, p'), E=65 MeV; 56Fe(p, p'), E=30, 65 MeV; analyzed σ(θ) data in literature using OPTMAN code; deduced optical potential model parameters, deformation parameters β2, β4 and γ. Comparison with γ-ray cross section data in literature. Discussed astrophysical implications of results of present experiment through TALYS calculation of γ-ray line emission spectra over the photon energy range of 0.1-10 MeV, expected to be generated in interactions of the low-energy cosmic rays (LECRs) in the inner Galaxy.
doi: 10.1103/PhysRevC.102.025802
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
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
2019LI45 Phys.Rev. C 100, 044318 (2019) C.G.Li, Q.B.Chen, S.Q.Zhang, C.Xu, H.Hua, S.Y.Wang, R.A.Bark, S.M.Wyngaardt, Z.Shi, A.C.Dai, C.G.Wang, X.Q.Li, Z.H.Li, J.Meng, F.R.Xu, Y.L.Ye, D.X.Jiang, R.Han, C.Y.Niu, Z.Q.Chen, H.Y.Wu, X.Wang, D.W.Luo, C.G.Wu, S.Wang, D.P.Sun, C.Liu, Z.Q.Li, B.H.Sun, P.Jones, L.Msebi, J.F.Sharpey-Schafer, T.Dinoko, E.A.Lawrie, S.S.Ntshangase, B.V.Kheswa, O.Shirinda, N.Khumalo, T.D.Bucher, K.L.Malatji "Stapler" mechanism for a dipole band in 79Se NUCLEAR REACTIONS 82Se(α, 3nα)79Se, E=65, 68 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO) using AFRODITE array of eight Compton-suppressed clover detectors at the iThemba LABS accelerator facility. 79Se; deduced levels, J, π, multipolarities, negative-parity dipole band interpreted as a stapler band, B(M1)/B(E2), configuration. Comparison with calculations using the self-consistent tilted axis cranking covariant density functional theory (TAC-CDFT).
doi: 10.1103/PhysRevC.100.044318
2019LI49 Phys.Rev. C 100, 054309 (2019) C.Liu, S.Y.Wang, B.Qi, S.Wang, D.P.Sun, Z.Q.Li, R.A.Bark, P.Jones, J.J.Lawrie, L.Masebi, M.Wiedeking, J.Meng, S.Q.Zhang, H.Hua, X.Q.Li, C.G.Li, R.Han, S.M.Wyngaardt, B.H.Sun, L.H.Zhu, T.D.Bucher, B.V.Kheswa, K.L.Malatji, J.Ndayishimye, O.Shirinda, T.Dinoko, N.Khumalo, E.A.Lawrie, S.S.Ntshangase New candidate chiral nucleus in the A ≈ 80 mass region: 8235Br47 NUCLEAR REACTIONS 82Se(α, 3np)82Br, E=65, 68 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(ADO), γγ(linear polarization) using the AFRODITE array at the separated-sector cyclotron (SSC) of iThemba LABS. 82Br; deduced levels, J, π, multipolarities, band structures, configurations, B(M1)/B(E2) ratios, energy staggering parameter, degenerate positive-parity chiral doublet bands; calculated valence proton and valence neutron angular momenta as functions of spin for 78,80,82Br, probability distributions for projection of total angular momentum for the chiral doublet bands in 82Br using triaxial particle rotor model (TPRM).
doi: 10.1103/PhysRevC.100.054309
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
2019MA64 Phys.Rev. C 100, 034322 (2019) S.N.T.Majola, R.A.Bark, L.Bianco, T.D.Bucher, S.P.Bvumbi, D.M.Cullen, P.E.Garrett, P.T.Greenlees, D.Hartley, J.Hirvonen, U.Jakobsson, P.M.Jones, R.Julin, S.Juutinen, S.Ketelhut, B.V.Kheswa, A.Korichi, E.A.Lawrie, P.L.Masiteng, B.Maqabuka, L.Mdletshe, A.Minkova, J.Ndayishimye, P.Nieminen, R.Newman, B.M.Nyako, S.S.Ntshangase, P.Peura, P.Rahkila, L.L.Riedinger, M.Riley, D.Roux, P.Ruotsalainen, J.Saren, J.F.Sharpey-Schafer, C.Scholey, O.Shirinda, A.Sithole, J.Sorri, S.Stolze, J.Timar, J.Uusitalo, G.Zimba Spectroscopy of low-spin states in 157Dy: Search for evidence of enhanced octupole correlations NUCLEAR REACTIONS 155Gd(α, 2n), E=25 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization) using enriched target and JUROGAM II array at Jyvaskyla. 157Dy; deduced levels, J, π, multipolarities, rotational bands, interlacing band structures, B(E1)/B(E2) ratios, reflection asymmetric structures with simplex quantum number, octupole correlations, alignments, configurations; calculated neutron quasiparticle Routhians.
doi: 10.1103/PhysRevC.100.034322
2019MA70 Phys.Rev. C 100, 044324 (2019) S.N.T.Majola, Z.Shi, B.Y.Song, Z.P.Li, S.Q.Zhang, R.A.Bark, J.F.Sharpey-Schafer, D.G.Aschman, S.P.Bvumbi, T.D.Bucher, D.M.Cullen, T.S.Dinoko, J.E.Easton, N.Erasmus, P.T.Greenlees, D.J.Hartley, J.Hirvonen, A.Korichi, U.Jakobsson, P.Jones, S.Jongile, R.Julin, S.Juutinen, S.Ketelhut, B.V.Kheswa, N.A.Khumalo, E.A.Lawrie, J.J.Lawrie, R.Lindsay, T.E.Madiba, L.Makhathini, S.M.Maliage, B.Maqabuka, K.L.Malatji, P.L.Masiteng, P.I.Mashita, L.Mdletshe, A.Minkova, L.Msebi, S.M.Mullins, J.Ndayishimye, D.Negi, A.Netshiya, R.Newman, S.S.Ntshangase, R.Ntshodu, B.M.Nyako, P.Papka, P.Peura, P.Rahkila, L.L.Riedinger, M.A.Riley, D.G.Roux, P.Ruotsalainen, J.J.Saren, C.Scholey, O.Shirinda, M.A.Sithole, J.Sorri, M.Stankiewicz, S.Stolze, J.Timar, J.Uusitalo, P.A.Vymers, M.Wiedeking, G.L.Zimba β and γ bands in N=88, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeformation NUCLEAR REACTIONS 136Xe(18O, 4n)150Sm, E=75 MeV; 148Nd(α, 2n)150Sm, E=25 MeV; 152Sm(α, 4n)152Gd, E=45 MeV; 152Sm(α, 2n)154Gd, E=25 MeV; 155Gd(3He, 4n)154Dy, E=37.5 MeV; 147Sm(12C, 3n)156Er, E=65 MeV; 155Gd(α, 3n)156Dy, E=25 MeV; 144Sm(18O, 4n)158Yb, E=78 MeV; 150Sm(12C, 4n)158Er, E=65 MeV; 156Gd(α, 2n)158Dy, E=27 MeV; 147Sm(16O, 3n)160Yb, E=73 MeV; 152Sm(12C, 4n)160Er, E=64 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization) using the AFRODITE array at the cyclotron facility of the iThemba Labs for 11 reactions, and JUROGAM II array at Jyvaskyla for 148Nd(α, 2n)150Sm and 155Gd(α, 3n)156Dy reactions. 150Sm, 152,154Gd, 154,156,158Dy, 156,160Er, 158,160Yb; deduced levels, J, π, multipolarities, β, γ and 0+ bands, B(E2) ratios. 150,152,154Sm, 152,154,156Gd, 154,156,158Dy, 156,158,160Er, 158,160,162Yb; calculated potential energy surfaces (PES) and probability density distribution contours in (β, γ) plane; deduced staggering parameters, in-band B(E2) values, absolute transition strengths of E0 transitions, X(E0/E2) values from present and previous experimental data. Comparison with 5DCH-CDFT calculations with PC-PK1 density functional.
doi: 10.1103/PhysRevC.100.044324
2019SI41 Eur.Phys.J. A 55, 178 (2019) M.A.Sithole, J.F.Sharpey-Schafer, S.N.T.Majola, T.D.Bucher, T.R.S.Dinoko, S.S.Ntshangase, E.A.Lawrie, N.A.Khumalo, S.Jongile, L.Mdletshe, R.A.Bark, N.Erasmus, P.Jones, B.V.Kheswa, J.J.Lawrie, L.Makhathini, K.L.Malatji, B.Maqabuka, S.P.Noncolela, J.Ndayishimye, O.Shirinda, B.R.Zikhali, P.L.Masiteng New collective structures in the 163Yb nucleus NUCLEAR REACTIONS 152Sm(16O, 5n)163Yb, E=93 MeV; measured Eγ, Iγ using AFRODITE γ-ray spectrometer at iThemba Labs; deduced 163Yb new levels and new rotational bands, the gs based band has been extended to 43/2- spin, high-K band based on neutron [505]11/2- Nilsson orbital observed and reported for the first time, observed additional new states which all decay to the yrast band, discussed band structure with reference to Cranked Shell Model (CSM) and systematically compared with neighboring nuclei; presented table of RAD ratios, γ-ray intensities, polarization asymmetries, initial and final energies, γ-muliplicities; deduced level schemes and transitions, bands 1 to 8, coincidenced (gated) γ-ray spectra, aligned angular momenta deduced for bands in 163Yb vs rotational energy.
doi: 10.1140/epja/i2019-12866-3
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
2018MD01 Eur.Phys.J. A 54, 176 (2018) L.Mdletshe, S.S.Ntshangase, J.F.Sharpey-Schafer, S.N.T.Majola, T.R.S.Dinoko, N.A.Khumalo, E.A.Lawrie, R.A.Bark, T.D.Bucher, N.Erasmus, P.Jones, S.Jongile, B.V.Kheswa, J.J.Lawrie, L.Makhathini, K.L.Malatji, B.Maqabuka, J.Ndayishimye, S.P.Noncolela, O.Shirinda, M.A.Sithole Low-lying positive parity bands in 162Yb NUCLEAR REACTIONS 150Sm(16O, 4n)162Yb, E=85 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization) using the AFRODITE array at the cyclotron facility of the iThemba Labs; deduced levels, J, π, multipolarities, γ and second 0+ bands, and staggering parameters.
doi: 10.1140/epja/i2018-12613-4
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
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
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
2016LI41 Phys.Rev. C 94, 024337 (2016) X.Q.Li, C.Xu, S.Q.Zhang, H.Hua, J.Meng, R.A.Bark, Q.B.Chen, C.Y.Niu, R.Han, S.M.Wyngaardt, S.Y.Wang, S.Wang, B.Qi, L.Liu, L.H.Zhu, Z.Shi, G.L.Zhang, B.H.Sun, X.Y.Le, C.Y.Song, Y.L.Ye, D.X.Jiang, F.R.Xu, Z.H.Li, J.J.Sun, Y.Shi, P.W.Zhao, W.Y.Liang, C.G.Li, C.G.Wang, X.C.Chen, Z.H.Li, D.P.Sun, C.Liu, Z.Q.Li, P.Jones, E.A.Lawrie, J.J.Lawrie, M.Wiedeking, T.D.Bucher, T.Dinoko, B.V.Kheswa, L.Makhathini, S.N.T.Majola, J.Ndayishimye, S.P.Noncolela, O.Shirinda, J.Gal, G.Kalinka, J.Molnar, B.M.Nyako, J.Timar, K.Juhasz, M.Arogunjo Spectroscopy of 155Yb: Structure evolution in the N=85 isotones NUCLEAR REACTIONS 144Sm(16O, 5n), E=118 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(ADO ratios) at cyclotron facility of iThemba LABS. 155Yb; deduced high-spin levels, J, π, multipolarity, bands, configurations; calculated potential energy contour in (β, γ) plane. Comparison with semiempirical shell-model (SESM) calculations. Predicted coexistence of prolate and oblate shapes from adiabatic and configuration-fixed constrained triaxial covariant density functional theory (CDFT) calculations. Systematics of low-lying levels in N=84-87 isotones: 148,149,150,151Gd, 150,151,152,153Dy, 152,153,154,155Er, 154,155,156,157Yb, 156,157,158,159Hf.
doi: 10.1103/PhysRevC.94.024337
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
2016OR06 Eur.Phys.J. A 52, 166 (2016) J.N.Orce, M.Kumar Raju, N.A.Khumalo, T.S.Dinoko, P.Jones, R.A.Bark, E.A.Lawrie, S.N.T.Majola, L.M.Robledo, B.Rubio, M.Wiedeking, J.Easton, E.A.Khaleel, B.V.Kheswa, N.Kheswa, M.S.Herbert, J.J.Lawrie, P.L.Masiteng, M.R.Nchodu, J.Ndayishimye, D.Negi, S.P.Noncolela, S.S.Ntshangase, P.Papka, D.G.Roux, O.Shirinda, P.S.Sithole, S.W.Yates Search for two-phonon octupole excitations in 146Gd NUCLEAR REACTIONS 144Sm(α, 2n), E=26.1-26.8 MeV; measured Eγ, Iγ(θ), γγ-coin. 148Gd deduced γ-ray energy spectra gated by specified γ transitions, relative γ intensities in depopulating the 6+ (3484.5 keV) state, linear polarization, B(E3) for one-photon and two-photon excitations; calculated B(E3) using GCM with Gogny D1S force.
doi: 10.1140/epja/i2016-16166-2
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
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
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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