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Search: Author = O.A.Tavares

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2022ME08      Phys.Rev. C 106, 024608 (2022)

E.L.Medeiros, N.Teruya, S.B.Duarte, O.A.P.Tavares

Nonlocality effect in α decay of heavy and superheavy nuclei

RADIOACTIVITY 185mPt(α); calculated contribution of the nonlocal effect on tunneling calculations. Z=52-103(α); Z=104-118(α); calculated T1/2 for 239 heavy and 16 superheavy nuclei using α-cluster potential barrier penetration model with semiclassical WKB approach. Comparison of experimental results with new universal plot (NUP), and with universal decay law (UDL). 110Te, 155Tm, 157Lu, 161,163Ta, 161,167Re, 165Ir, 169,171Au, 183Tl, 220,236U, 224Pu, 232,250Cm, 242,244Fm, 258No, 257Lr, 260,264,266Rf, 257Db, 258,262,264,266Sg, 274,276Hs, 278,280,282Cn, 284Fl(α); calculated T1/2 and compared with experimental values.

doi: 10.1103/PhysRevC.106.024608
Citations: PlumX Metrics

2020TA06      Appl.Radiat.Isot. 160, 109034 (2020)

O.A.P.Tavares, M.L.Terranova

Partial alpha-decay half-lives for alpha-emitting Osmium isotopes: Accurate determinations by a semi-empirical model

RADIOACTIVITY 161,162,163,164,165,166,167,168,169,170,171,172,173,174Os, 184Os, 186,187,188Os(α);calculated partial T1/2, α-decay schemes. Comparison with ENSDF library data.

doi: 10.1016/j.apradiso.2020.109034
Citations: PlumX Metrics

2020TA19      Appl.Radiat.Isot. 166, 109381 (2020)

O.A.P.Tavares, E.L.Medeiros, M.L.Terranova

Alpha-decay half-life of Hafnium isotopes reinvestigated by a semi-empirical approach

RADIOACTIVITY 159,161,174,176Hf(α); analyzed available data; calculated T1/2, Q-values using heavy-particle decay calculation model.

doi: 10.1016/j.apradiso.2020.109381
Citations: PlumX Metrics

2019TA14      Int.J.Mod.Phys. E28, 1950021 (2019)

O.A.P.Tavares, E.L.Medeiros

Nuclear radii from nuclear masses

doi: 10.1142/S0218301319500216
Citations: PlumX Metrics

2018TA09      Eur.Phys.J. A 54, 65 (2018)

O.A.P.Tavares, E.L.Medeiros

A calculation model to half-life estimate of two-proton radioactive decay process

RADIOACTIVITY A=19-67(2p); calculated proton-rich nuclei 2p-decay T1/2, partial T1/2 using tunelling mechanism through potential barrier. Compared with available data. Remark: Double-proton decay not yet observed for all calculated nuclei.

doi: 10.1140/epja/i2018-12495-4
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2018TA16      Appl.Radiat.Isot. 139, 26 (2018)

O.A.P.Tavares, M.L.Terranova

Toward an accurate determination of half-life of 147Sm isotope

RADIOACTIVITY 147Sm(α); analyzed available data; deduced T1/2.

doi: 10.1016/j.apradiso.2018.04.001
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2017GO17      Phys.Lett. B 774, 14 (2017)

M.Goncalves, N.Teruya, O.A.P.Tavares, S.B.Duarte

Two-proton emission half-lives in the effective liquid drop model

RADIOACTIVITY 16Ne, 19Mg, 45Fe, 48Ni, 54Zn, 67Kr(2p); calculated Q-values and T1/2. Comparison with experimental data.

doi: 10.1016/j.physletb.2017.09.032
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2013DE37      Phys.Rev. C 88, 064609 (2013)

A.Deppman, E.Andrade, II, V.Guimaraes, G.S.Karapetyan, O.A.P.Tavares, A.R.Balabekyan, N.A.Demekhina, J.Adam, F.Garcia, K.Katovsky

Superasymmetric fission of heavy nuclei induced by intermediate-energy protons

NUCLEAR REACTIONS 237Np, 238U(p, F)28Mg/34mCl/38S/38Cl/39Cl/41Ar/42K/43K/43Sc/44Ar/44K/44Sc/44mSc/45K/46Sc/46mSc/47Ca/47Sc/48Sc/48V/48Cr/49Cr/51Cr/52Mn/52mMn/52Fe/54Mn/55Co/56Mn/56Co/56Ni/57Co/57Ni/58Co/58mCo/59Fe/60Co/60mCo/60Cu/61Cu/65Ni/65Zn/65Ga/66Ni/66Ga/66Ge/67Cu/67Ga/69mZn/69Ge, E=660 MeV; measured Eγ, Iγ, production σ of intermediate-mass fragments (IMF) by induced activation method at LNR Phasotron-JINR cyclotron facility. A total of 93 isotopes in A=30-200 range identified with high precision. Comparison with simulation code CRISP for multimodal fission. Discussed superasymmetric fragment production mechanism.

doi: 10.1103/PhysRevC.88.064609
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetF1232.

2013TA07      Eur.Phys.J. A 49, 6 (2013)

O.A.P.Tavares, E.L.Medeiros

A calculation method to estimate partial half-lives for exotic radioactivities

RADIOACTIVITY 222,223Fr, 225Ra, 227Ac, 224Th(14C);224Ac, 225Pa(15N);226,227Th(18O);229Th(20O);232Th(26Ne);233,235U, 235,236Np(28Mg);235U(29Mg);238U, 239,240Pu, 241,243Am, 240Cm(34Si);237Np(30Mg);237Np, 241Am, 240Cm(32Si); calculated T1/2 using semi-empirical model; deduced model parameters. Compared with other calculations.

doi: 10.1140/epja/i2013-13006-y
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2012TA10      Phys.Scr. 86, 015201 (2012)

O.A P.Tavares, E.L.Medeiros

A simple description of cluster radioactivity

RADIOACTIVITY 238U, 239,240Pu, 241,243Am, 240,242,243Cm(34Si), 236,237Np, 238Pu, 241Am, 240,242Cm(32Si), 252Cf, 254Es(46Ar), 252Es(48Ca), 254Es, 258Md, 259No(50Ca), 259No(49Ca), 228Th(20O), 240Pu(34Si), 259No(50Ca), 282Rg(73Ni), 291Mc(85Br); calculated T1/2, Q-values, branching ratios. Comparison with available data.

doi: 10.1088/0031-8949/86/01/015201
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2011AN29      J.Phys.:Conf.Ser. 312, 082010 (2011)

E.Andrade, II, J.C.M.Menezes, S.B.Duarte, F.Garcia, P.C.R.Rossi, O.A.P.Tavares, A.Deppman

Fragment mass distributions for heavy nuclei fission induced by intermediate energy probes

NUCLEAR REACTIONS 237Np, 241Am(p, F), E=660 MeV;238U(γ, F), E=0-50 MeV; calculated mass distribution from bremsstrahlung reaction using Monte Carlo for nuclear cascade followed by competition between fission and particle emission. Compared with data and other calculations.

doi: 10.1088/1742-6596/312/4/082010
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2011TA23      Phys.Scr. 84, 045202 (2011)

O.A.P.Tavares, E.L.Medeiros

Natural and artificial alpha radioactivity of platinum isotopes

RADIOACTIVITY 166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,192,194,195,196,198Pt(α);calculated T1/2. Comparison with experimental values.

doi: 10.1088/0031-8949/84/04/045202
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2010TA24      Eur.Phys.J. A 45, 57 (2010)

O.A.P.Tavares, E.L.Medeiros

Proton radioactivity: The case for 53mCo proton-emitter isomer

RADIOACTIVITY 53mCo(p); calculated T1/2 using semi-empirical model. 53mCo deduced deformation. Re-analysis of older results also using data on other proton emitters.

doi: 10.1140/epja/i2010-10974-2
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2009LE22      Phys.Rev. C 80, 014606 (2009)

T.N.Leite, N.Teruya, A.Dimarco, S.B.Duarte, O.A.P.Tavares, M.Goncalves

12O resonant structure evaluated by the two-proton emission process

RADIOACTIVITY 12O(2p); analyzed characteristics of resonant ground state, decay energy distribution, channel distribution ratios, and widths using statistical model for the sequential and simultaneous two-proton emission decay modes. Comparison with experimental data.

doi: 10.1103/PhysRevC.80.014606
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2007ME28      Eur.Phys.J. A 34, 417 (2007)

E.L.Medeiros, M.M.N.Rodrigues, S.B.Duarte, O.A.P.Tavares

Systematics of half-lives for proton radioactivity

NUCLEAR STRUCTURE A=30-186; analyzed proton-decay partial T1/2.

RADIOACTIVITY 30Cl, 53Co, 58Ge, 68Br, 89Rh, 105Sb, 108,109I, 112,113Cs, 117La, 121Pr, 130,131Eu, 135Tb, 140,141Ho, 145,146,147Tm, 150,151Lu, 155,156,157Ta, 159,160,161Re, 164,165,166,167Ir, 170,171,173Au, 176,177Tl, 184,185,186Bi(p); calculated proton-decay partial T1/2. Semi-empirical model including effect of deformation.

doi: 10.1140/epja/i2007-10513-4
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2006DE27      Phys.Rev. C 73, 064607 (2006)

A.Deppman, G.Silva, S.Anefalos, S.B.Duarte, F.Garcia, F.H.Hisamoto, O.A.P.Tavares

Photofission and total photoabsorption cross sections in the energy range of shadowing effects

NUCLEAR REACTIONS 12C, 27Al, 63Cu, 118Sn, 207Pb(γ, X), E=1000-3000 MeV; calculated total photoabsorption σ. 207Pb, 232Th, 233,235,238U, 237Np(γ, F), E=900-3400 MeV; calculated photofission σ. Comparison with data.

doi: 10.1103/PhysRevC.73.064607
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2006ME15      J.Phys.(London) G32, B23 (2006)

E.L.Medeiros, M.M.N.Rodrigues, S.B.Duarte, O.A.P.Tavares

Systematics of alpha-decay half-life: new evaluations for alpha-emitter nuclides

NUCLEAR STRUCTURE A=100-300; analyzed α-decay T1/2; deduced parameters.

RADIOACTIVITY 110Te, 113I, 151Gd, 174Hf, 163Ta, 180W, 184Os, 210Po, 200,206,208,211,218At, 203,228Ra, 231Pa, 250Cm, 266Sg, 272Rg(α); calculated α-decay partial T1/2. Semiempirical model.

doi: 10.1088/0954-3899/32/8/B01
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2006ME20      J.Phys.(London) G32, 2345 (2006)

E.L.Medeiros, M.M.N.Rodrigues, S.B.Duarte, O.A.P.Tavares

Comments on the rarest alpha activity observed in nature

RADIOACTIVITY 180W(α); compiled, analyzed T1/2.

doi: 10.1088/0954-3899/32/11/N01
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2006MO44      Braz.J.Phys. 36, 1383 (2006)

V.Morcelle, O.A.P.Tavares

Fissility of Actinide Nuclei by 60-130 MeV Photons

NUCLEAR REACTIONS 232Th, 233,235,238U, 237Np(γ, F), Eγ=60-130 MeV; calculated total nuclear photoabsorption cross section based on the quasi-deuteron nuclear photabsorption model, and nuclear fissility from the available data.

doi: 10.1590/S0103-97332006000800011
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2006TA01      Nucl.Instrum.Methods Phys.Res. B243, 256 (2006)

O.A.P.Tavares, M.L.Terranova, E.L.Medeiros

New evaluation of alpha decay half-life of 190Pt isotope for the Pt-Os dating system

RADIOACTIVITY 166,167,168,170,171,172,174,175,176,177,178,180,181,182,183,184,186,188Pt(α); analyzed T1/2, Qα; deduced parameters. 190Pt(α); calculated T1/2. Semi-empirical model, astrophysical implications discussed.

doi: 10.1016/j.nimb.2005.08.122
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2005TA03      J.Phys.(London) G31, 129 (2005)

O.A.P.Tavares, E.L.Medeiros, M.L.Terranova

Alpha decay half-life of bismuth isotopes

RADIOACTIVITY 187,189,191,193,195,197,199,200,201,202,203,204,205,206,207,208,209,211,212,213,214Bi(α); calculated α-decay partial T1/2. Comparison with data.

doi: 10.1088/0954-3899/31/2/005
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2005TA37      Braz.J.Phys. 35, 915 (2005)

O.A.P.Tavares, S.B.Duarte, V.Morcelle, A.Deppman

Photofissility at 1 GeV for Nuclei Throughout the Periodic Table

NUCLEAR REACTIONS 48Ti, 56Fe, 59Ni, 63Cu, 65Zn, 93Nb, 96Mo, 108Ag, 112Cd, 115In, 119Sn, 122Sb, 128Te, 139La, 140Ce, 144Nd, 150Sm, 157Gd, 159Tb, 163Dy, 165Ho, 169Tm, 173,174Yb, 175Lu, 178Hf, 181Ta, 184W, 186Re, 190Os, 195Pt, 197Au, 201Hg, 204Tl, 207,208Pb, 209Bi, 232Th, 233,235,238U, 237Np(γ, F), E=1 GeV; calculated first-chance fission probability.

doi: 10.1590/S0103-97332005000500054
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2004DU23      J.Phys.(London) G30, 1487 (2004)

S.B.Duarte, O.A.P.Tavares, M.Goncalves, O.Rodriguez, F.Guzman, T.N.Barbosa, F.Garcia, A.Dimarco

Half-life predictions for decay modes of superheavy nuclei

NUCLEAR STRUCTURE Z=110-135; calculated α-decay, cluster-decay, and cold fission T1/2. Effective liquid-drop model.

RADIOACTIVITY 287,288Mc, 283,284Nh, 279,280Rg(α); calculated T1/2, Qα. Effective liquid-drop model, comparison with data.

doi: 10.1088/0954-3899/30/10/014
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2004LI78      Braz.J.Phys. 34, 753 (2004)

V.P.Likhachev, J.D.T.Arruda-Neto, M.T.F.da Cruz, H.Dias, S.B.Duarte, W.R.Carvalho, Jr., M.S.Hussein, A.C.S.Lima, L.F.R.Macedo, J.Mesa, S.A.Pashchuk, T.E.Rodrigues, G.Silva, H.R.Schelin, O.A.P.Tavares

Residual Nucleus Excitation Energy in (e, e'p)- Reaction

doi: 10.1590/S0103-97332004000500012
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2004RO22      Phys.Rev. C 69, 064611 (2004)

T.E.Rodrigues, J.D.T.Arruda-Neto, A.Deppman, V.P.Likhachev, J.Mesa, C.Garcia, K.Shtejer, G.Silva, S.B.Duarte, O.A.P.Tavares

Photonuclear reactions at intermediate energies investigated via the Monte Carlo multicollisional intranuclear cascade model

NUCLEAR REACTIONS Sn, Ce, Ta, Pb(γ, X), E=20-140 MeV; calculated total photoabsorption σ, neutron multiplicities. Monte Carlo multicollisional intranuclear cascade model, comparison with data.

doi: 10.1103/PhysRevC.69.064611
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2004TA04      J.Phys.(London) G30, 377 (2004)

O.A.P.Tavares, S.B.Duarte, A.Deppman, V.P.Likhachev

Nuclear photofissility of natPb and 232Th at energies above the pion photoproduction threshold

NUCLEAR REACTIONS Pb, 232Th(γ, F), E=0.2-6 GeV; calculated fissility, fragment production probabilities. Intranuclear cascade and evaporation-fission competition mechanisms, comparison with data.

doi: 10.1088/0954-3899/30/4/001
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2004TA05      J.Phys.(London) G30, 395 (2004)

O.A.P.Tavares, E.L.Medeiros

Level density parameter at the fission saddle point from intermediate-energy photofission cross section data

NUCLEAR REACTIONS 232Th, 233,235,238U, 237Np(γ, F), E ≈ 40-130 MeV; analyzed photofission data; deduced level density parameter.

doi: 10.1088/0954-3899/30/4/002
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2004TA48      Braz.J.Phys. 34, 924 (2004)

O.A.P.Tavares, S.B.Duarte, A.Deppman, V.P.Likhachev

New Approach to Nuclear Photofission Reactions above 0.15 GeV

NUCLEAR REACTIONS Pb(γ, F), E ≈ 0.1-7 GeV; analyzed fission probability. Two-step model.

doi: 10.1590/S0103-97332004000500058
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2003DE20      Nucl.Instrum.Methods Phys.Res. B211, 15 (2003)

A.Deppman, O.A.P.Tavares, S.B.Duarte, J.D.T.Arruda-Neto, M.Goncalves, V.P.Likhachev, J.Mesa, E.C.de Oliveira, S.R.de Pina, O.Rodriguez

A Monte Carlo method for nuclear evaporation and fission at intermediate energies

NUCLEAR STRUCTURE 237Np, 238U, 232Th; calculated fissility vs excitation energy, competition with evaporation channels. Monte Carlo approach.

doi: 10.1016/S0168-583X(03)01265-5
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2002DE35      J.Phys.(London) G28, 2259 (2002)

S.R.de Pina, J.Mesa, A.Deppman, J.D.T.Arruda-Neto, S.B.Duarte, E.C.de Oliveira, O.A.P.Tavares, E.L.Medeiros, M.Goncalves, E.de Paiva

Nucleon Effective Mass Effects on the Pauli-Blocking Function

doi: 10.1088/0954-3899/28/8/311
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2002DE60      Phys.Rev. C 66, 067601 (2002)

A.Deppman, O.A.P.Tavares, S.B.Duarte, J.D.T.Arruda-Neto, M.Goncalves, V.P.Likhachev, E. C.de Oliveira

Photofissility of heavy nuclei at intermediate energies

NUCLEAR REACTIONS 209Bi, 232Th, 238U, 237Np, 243Am(γ, F), E=200-1000 MeV; calculated fissility. 209Bi, 243Am(γ, F), E=200-1000 MeV; calculated photofission σ. Monte Carlo approach.

doi: 10.1103/PhysRevC.66.067601
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2002DU16      At.Data Nucl.Data Tables 80, 235 (2002)

S.B.Duarte, O.A.P.Tavares, F.Guzman, A.Dimarco, F.Garcia, O.Rodriguez, M.Goncalves

Half-Lives for Proton Emission, Alpha Decay, Cluster Radioactivity, and Cold Fission Processes Calculated in a Unified Theoretical Framework

RADIOACTIVITY 105Sb, 109I, 112,113Cs, 117La, 131Eu, 140,141Ho, 145,146,147Tm, 150,151Lu, 156,157Ta, 160,161Re, 165,166,167Ir, 171Au, 185Bi(p); calculated proton emission T1/2. 221Fr, 221,222,223,224,226Ra, 225Ac(14C); 228Th(20O); 230Th, 231Pa, 232,233,234U(24Ne); 234U(26Ne); 234U, 236,238Pu(28Mg); 238Pu(30Mg), (32Si); 242Cm(34Si); calculated cluster emission T1/2. 258,259Fm, 259,260Md, 258,262No(SF); calculated fission fragment mass distributions. Z=27-111; A=50-273; calculated T1/2, Q for p-decay, α-decay, cluster emission. Z=82-111; A=180-272; calculated cold fission T1/2. Effective liquid drop model, comparisons with data.

doi: 10.1006/adnd.2002.0881
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2001DE27      J.Phys.(London) G27, 1435 (2001)

E.de Paiva, O.A.P.Tavares, M.L.Terranova

Nuclear Photofissility in the Quasi-Deuteron Energy Region

NUCLEAR REACTIONS 27Al, 48Ti, 51V, 154Sm, 174Yb, 178Hf, 181Ta, 184W, 186Re, 190Os, 195Pt, 197Au, 204Tl, 207,208Pb, 209Bi(γ, F), E ≈ 20-160 MeV; analyzed fission data; deduced reaction mechanism features. Two-step model, quasi-deuteron photon absorption.

doi: 10.1088/0954-3899/27/7/305
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2001DE41      Phys.Rev.Lett. 87, 182701 (2001)

A.Deppman, O.A.P.Tavares, S.B.Duarte, E.C.de Oliveira, J.D.T.Arruda-Neto, S.R.de Pina, V.P.Likhachev, O.Rodriguez, J.Mesa, M.Goncalves

Photofissility of Actinide Nuclei at Intermediate Energies

NUCLEAR REACTIONS 237Np, 238U, 232Th(γ, F), E ≈ 200-1000 MeV; analyzed fissility; deduced role of proton and α evaporation. Monte Carlo approach.

doi: 10.1103/PhysRevLett.87.182701
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2000DI17      Int.J.Mod.Phys. E9, 205 (2000)

A.Dimarco, S.B.Duarte, O.A.P.Tavares, M.Goncalves, F.Garcia, O.Rodriguez, F.Guzman

Effect of Nuclear Deformation on the Alpha-Decay Half-Life of Even-Even Alpha Emitters

NUCLEAR STRUCTURE Z=52-108; calculated α-decay T1/2, deformation effects. Comparison with data.

doi: 10.1016/S0218-3013(00)00014-3
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2000GA25      J.Phys.(London) G26, 755 (2000)

F.Garcia, O.Rodriguez, M.Goncalves, S.B.Duarte, O.A.P.Tavares, F.Guzman

Alpha Decay and Nuclear Deformation: The case for favoured alpha transitions of even-even emitters

RADIOACTIVITY A=106-264(α); calculated T1/2 including quadrupole deformation effects. Comparison with experimental values.

doi: 10.1088/0954-3899/26/6/301
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1999GU08      Phys.Rev. C59, R2339 (1999)

F.Guzman, M.Goncalves, O.A.P.Tavares, S.B.Duarte, F.Garcia, O.Rodriguez

Proton Radioactivity from Proton-Rich Nuclei

RADIOACTIVITY 55Cu, 58Ge, 105Sb, 109I, 112,113Cs, 142Ho, 146,147Tm, 150,151Lu, 156,157Ta, 160,161Re, 165,166,167Ir, 171Au, 177,178,179Tl, 185,187Bi(p); calculated proton decay T1/2. Effective liquid drop model. Comparison with data.

doi: 10.1103/PhysRevC.59.R2339
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1999RO01      Phys.Rev. C59, 253 (1999)

O.Rodriguez, F.Guzman, S.B.Duarte, O.A.P.Tavares, F.Garcia, M.Goncalves

New Valleys of Cold Fission and Cluster Radioactivity Processes from Nuclei Far from the β-Stability Line

RADIOACTIVITY Rn, Po, Pb; calculated α-decay T1/2. Ba, Sn, Po, Bi; calculated cluster decay T1/2 in neutron-deficient isotopes; deduced shell effects. Geiger-Nutall systematics.

doi: 10.1103/PhysRevC.59.253
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1999TA27      J.Phys.(London) G25, 1979 (1999)

O.A.P.Tavares, E.De Paiva, G.Ya.Kezerashvili, R.Ya.Kezerashvili, N.Yu.Muchnoi, A.I.Naumenkov, I.Ya.Protopopov, E.A.Simonov, M.L.Terranova

Photofission of 27Al Nucleus in the Quasi-Deuteron Region of Photonuclear Absorption

NUCLEAR REACTIONS 27Al(γ, F), E ≈ 108 MeV; measured absorption, fission σ. 27Al deduced fissility.

doi: 10.1088/0954-3899/25/9/315
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1998DU05      Phys.Rev. C57, 2516 (1998)

S.B.Duarte, O.Rodriguez, O.A.P.Tavares, M.Goncalves, F.Garcia, F.Guzman

Cold Fission Description with Constant and Varying Mass Asymmetries

RADIOACTIVITY 234U(SF); calculated T1/2, fragments mass distributions. Comparison of constant, variable mass asymmetry descriptions. Alpha, cluster radioactivity also discussed.

doi: 10.1103/PhysRevC.57.2516
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1998TA21      J.Phys.(London) G24, 1757 (1998)

O.A.P.Tavares, S.B.Duarte, O.Rodriguez, F.Guzman, M.Goncalves, F.Garcia

Effective Liquid Drop Description for Alpha Decay of Atomic Nuclei

NUCLEAR STRUCTURE Z=52-111; calculated α-decay T1/2. Effective liquid drop model. Comparison with data.

doi: 10.1088/0954-3899/24/9/009
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1998TE02      J.Phys.(London) G24, 205 (1998)

M.L.Terranova, G.Ya.Kezerashvili, A.M.Milov, S.I.Mishnev, N.Yu.Muchnoi, A.I.Naumenkov, I.Ya.Protopopov, E.A.Simonov, D.N.Shatilov, O.A.P.Tavares, E.De Paiva, E.L.Moreira

Photofission Cross Section and Fissility of Pre-Actinide and Intermediate-Mass Nuclei by 120 and 145 MeV Compton Backscattered Photons

NUCLEAR REACTIONS 209Bi, Pt, 197Au, W, 181Ta, 51V, Ti(γ, F), E=120, 145 MeV; measured photofission, total photoabsorption σ; deduced fissility Z2/A dependence.

doi: 10.1088/0954-3899/24/1/023
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0547.

1997DU14      Phys.Rev. C56, 3414 (1997)

S.B.Duarte, O.A.P.Tavares, M.Goncalves

Importance of the Inner Potential Barrier in Nuclear Spontaneous Cold Fission Processes

RADIOACTIVITY 234U, 242Pu, 248Cf, 252Cf(SF); calculated potential barrier for several decay modes; deduced inner barrier role.

doi: 10.1103/PhysRevC.56.3414
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1997TA18      Nuovo Cim. 110A, 497 (1997)


Anisotropy of Favoured Alpha Transitions Producing Even-Even Deformed Nuclei

RADIOACTIVITY 252Cf(α); calculated Coulomb barrier for favored α-decay; deduced daughter nucleus deformation effects. Other nuclei discussed.

doi: 10.1007/BF03035896
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1997TA33      Radiat.Meas. 27, 19 (1997)

O.A.P.Tavares, M.L.Terranova

Alpha activity of 190Pt isotope measured with CR-39 track detector

RADIOACTIVITY 190Pt(α); measured decay products, Eα, Iα; deduced T1/2 of 190Pt decay using CR-39 track detector at Gran-Sasso Underground Laboratory (INFN-LNGS). Natural platinum sample. Comparison with previous measurements of half-lives by direct counting.

doi: 10.1016/S1350-4487(96)00154-0
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1996TE05      J.Phys.(London) G22, 511 (1996)

M.L.Terranova, O.A.P.Tavares, G.Ya.Kezerashvili, V.A.Kiselev, A.M.Milov, N.Yu.Muchnoi, A.I.Naumenkov, V.V.Petrov, I.Ya.Protopopov, E.A.Simonov, E.de Paiva, E.L.Moreira

Fissility of Bi, Pb, Au, Pt, W, Ta, V and Ti Nuclei Measured with 100 MeV Compton Backscattered Photons

NUCLEAR REACTIONS, ICPND 209Bi, Pb, 197Au, Pt, W, 181Ta, 51V, Ti(γ, F), E=100 MeV; measured fission yield; deduced absolute photofission σ, photofissility for elemental targets. 209Bi, 197Au, 181Ta, 51V deduced photofissility.

doi: 10.1088/0954-3899/22/4/012
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1996TE08      J.Phys.(London) G22, 1661 (1996)

M.L.Terranova, G.Ya.Kezerashvili, V.A.Kiselev, A.M.Milov, S.I.Mishnev, I.Ya.Protopopov, V.N.Rotaev, D.N.Shatilov, O.A.P.Tavares

Fission Cross Section and Fissility of 209Bi by 60-270 MeV Tagged Photons

NUCLEAR REACTIONS 209Bi(γ, F), E=60-270 MeV; measured photon induced fission σ(E); analyzed other data. 209Bi deduced fissility vs Eγ. Multi-wire spark counters based fragment detector. Two-step model analysis.

doi: 10.1088/0954-3899/22/11/013
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1994TE02      Phys.Scr. 49, 267 (1994)

M.L.Terranova, O.A.P.Tavares

Total Nuclear Photoabsorption Cross Section in the Range 0.2-1.0 GeV for Nuclei Throughout the Periodic Table

NUCLEAR STRUCTURE A=3-238; analyzed photoabsorption σ(E) for targets in this mass range for E ≈ 0.2-1 GeV; deduced mean σ.

doi: 10.1088/0031-8949/49/3/004
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1993TA05      J.Phys.(London) G19, 805 (1993)

O.A.P.Tavares, J.B.Martins, E.de Paiva, E.L.Moreira, J.L.Vieira, M.L.Terranova, M.Capogni, L.Casano, A.D'Angelo, D.Moricciani, F.Ghio, B.Girolami, D.Babusci

Fission Induced in (nat)Ta, (nat)W and (nat)Pt Targets by 69 MeV Monochromatic Photons

NUCLEAR REACTIONS Ta, W, Pt(γ, F), E=69 MeV; measured fission σ; deduced fissility, absolute photofission σ.

doi: 10.1088/0954-3899/19/5/014
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1993TA18      J.Phys.(London) G19, 2145 (1993)

O.A.P.Tavares, J.B.Martins, E.L.Moreira, M.L.Terranova, M.Capogni, L.Casano, A.D'Angelo, D.Moricciani, C.Schaerf, B.Girolami, F.Ghio, D.Babusci

Fission of 27Al Nucleus by 69 MeV Monochromatic Photons

NUCLEAR REACTIONS 27Al(γ, F), E=69 MeV; measured absolute fission σ, fissility. 154Sm, 174Yb(γ, F), E=69 MeV; analyzed absolute fission σ, fissility data. Monochromatic photon beam, plastic track detectors. Two-step model, other data discussed.

doi: 10.1088/0954-3899/19/12/017
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1992TA06      J.Phys.(London) G18, 521 (1992)

O.A.P.Tavares, M.L.Terranova

Nuclear Photoabsorption by Quasi-Deuterons and an Updated Evaluation of Levinger's Constant

NUCLEAR STRUCTURE A ≤ 200; analyzed photoabsorption, rms radius data; deduced Levinger constant. Quasideuteron model.

doi: 10.1088/0954-3899/18/3/006
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1992TA13      Z.Phys. A343, 407 (1992)

O.A.P.Tavares, M.L.Terranova

Analysis of 209Bi and 238U Photofission Cross Section in the Quasi-Deuteron Region of Photonuclear Absorption

NUCLEAR REACTIONS 209Bi, 238U(γ, F), E=30-140 MeV; analyzed photofission σ(E). Quasideuteron photoabsorption followed by evaporation fission model.

doi: 10.1007/BF01289817
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1992TA14      Nuovo Cim. 105A, 723 (1992)

O.A.P.Tavares, M.L.Terranova

A New Systematics of Fragment Total Kinetic Energy Release in Fission

doi: 10.1007/BF02730778
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1991DE04      Nuovo Cim. 104A, 263 (1991)

D.A.De Lima, W.C.C.Milomem, O.A.P.Tavares

Probability of Ternary Fission of 93Nb and (nat)Ag Nuclei Induced by (0.8 - 1.8) GeV Photons

NUCLEAR REACTIONS 93Nb, Ag(γ, F), E=0.8-1.8 GeV bremsstrahlung; measured ternary to binary fission σ ratio. 93Nb, Ag deduced ternary fission probability.

doi: 10.1007/BF02910880
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1991MA22      Phys.Rev. C44, 354 (1991)

J.B.Martins, E.L.Moreira, O.A.P.Tavares, J.L.Vieira, L.Casano, S.D'Angelo, C.Schaerf, M.L.Terranova, D.Babusci, B.Girolami

Absolute Photofission Cross Section of 197Au, (nat)Pb, 209Bi, 232Th, 238U, and 235U Nuclei by 69-MeV Monochromatic and Polarized Photons

NUCLEAR REACTIONS, ICPND 197Au, Pb, 209Bi, 232Th, 235,238U(polarized γ, F), E=69 MeV; measured fission σ(E). 197Au, 208Pb, 209Bi, 235,238U, 232Th deduced nuclear fissility. Other data input. Nuclear-track detectors, monochromatic beam. Quasi-deuteron photoabsorption, evaporation-fission competition models.

doi: 10.1103/PhysRevC.44.354
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1991TA15      Phys.Rev. C44, 1683 (1991)

O.A.P.Tavares, M.L.Terranova, L.Casano, S.D'Angelo, D.Moricciani, C.Schaerf, D.Babusci, B.Girolami, J.B.Martins, E.L.Moreira, J.L.Vieira

Fission of Complex Nuclei Induced by 52-MeV Monochromatic and Polarized Photons

NUCLEAR REACTIONS 232Th, 235,238U(polarized γ, F), E=52 MeV; measured absolute fission σ(E). 237Np, 209Bi, 208Pb, 174Yb(γ, F), E not given; analyzed fission data. 237Np, 235,238U, 232Th, 209Bi, 208Pb, 174Yb deduced fissility. Monochromatic photons, nuclear-track detectors. Quasi-deuteron photoabsorption, evaporation-fission competition models.

doi: 10.1103/PhysRevC.44.1683
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1991TE04      Nuovo Cim. 104A, 1429 (1991)

M.L.Terranova, J.D.Pinheiro Filho, E.S.De Almeida, J.B.Martins, O.A.P.Tavares

Analysis of Fission and Fragmentation Events Produced in Ag and Br Nuclei by Interaction of Bremsstrahlung Beams in the Energy Range (1.0-5.5) GeV

NUCLEAR REACTIONS Ag, Br(γ, F), (γ, X), E=1-5.5 GeV bremsstrahlung; measured fission, fragmentation product σ(θ), (fragment)(fragment)(θ); deduced mean σ per photon, fissilities.

doi: 10.1007/BF02817425
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1990DE17      Nuovo Cim. 103A, 701 (1990)

D.A.De Lima, J.B.Martins, O.A.P.Tavares

Fission of Al, Ti, Co, Zr, Nb, Ag, In, Nd, Sm and Ta Nuclei Induced by (0.8 - 1.8) GeV Photons

NUCLEAR REACTIONS, ICPND 27Al, Ti, 59Co, Zr, 93Nb, Ag, In, Nd, Sm, Ta(γ, F), E=0.8-1.8 GeV bremmsstrahlung; measured photofission yields; deduced fissility. Solid state track detectors.

doi: 10.1007/BF02789022
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1989DE30      Nuovo Cim. 101A, 975 (1989)

D.A.De Lima, E.V.De Sousa, W.C.C.Milomem, O.A.P.Tavares

Cross-Section of Ternary Fission of Al, Ti, Co, and Zr Nuclei Induced by (0.8-1.8) GeV Photons

NUCLEAR REACTIONS 27Al, Ti, 59Co, Zr(γ, F), E=0.8-1.4 GeV bremsstrahlung; measured ternary fission σ(E); deduced ternary fission probability. Fission track detectors.

doi: 10.1007/BF02800164
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1989FO05      Radiochim.Acta 46, 57 (1989)

M.Foshina, J.B.Martins, O.A.P.Tavares, V.Di Napoli

Systematics of Photon- and Electron-Induced Spallation Reactions

NUCLEAR REACTIONS 51V(γ, X), E=0.075-5 GeV bremsstrahlung; 55Mn(γ, X), E=0.3-5 GeV bremsstrahlung; 59Co, Fe(γ, X), E=0.3-1.5 GeV bremsstrahlung; Cu(γ, X), E=0.32-5 GeV bremsstrahlung; 75As, Ga(γ, X), E=0.320 GeV; calculated fragment yield distributions. Semi-empirical four parameter formula.

1989MA36      Nuovo Cim. 101A, 789 (1989)

J.B.Martins, E.L.Moreira, O.A.P.Tavares, J.L.Vieira, J.D.Pinheiro Filho, R.Bernabei, S.d'Angelo, M.P.De Pascale, C.Schaerf, B.Girolami

Nuclear Fission of 197Au, (nat)Pb and 209Bi Induced by Polarized and Monochromatic Photons of 60 and 64 MeV

NUCLEAR REACTIONS 197Au, Pb, 209Bi(γ, F), (polarized γ, F), E=60, 64 MeV; measured fission σ, fissionability. 197Au, 208Pb, 209Bi deduced first chance fission probability.

doi: 10.1007/BF02844870
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1988BE37      Nuovo Cim. 100A, 131 (1988)

R.Bernabei, V.C.De Oliveira, J.B.Martins, O.A.P.Tavares, J.D.Pinheiro Filho, S.D'Angelo, M.P.De Pascale, C.Schaerf, B.Girolami

Photofission Cross-Section of 238U in the Quasi-Deuteron Region

NUCLEAR REACTIONS 238U(γ, F), E=46-72 MeV; measured fission σ(E).

doi: 10.1007/BF02902646
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1986DE32      Phys.Rev. C34, 2261 (1986)

H.G.de Carvalho, J.B.Martins, O.A.P.Tavares

Radioactive Decay of Radium and Radon Isotopes by 14C Emission

RADIOACTIVITY 220,221,222,223,224,225,226,228Ra, 217,218,219,220,221,222,223Rn(14C); calculated T1/2; deduced branching ratios.

doi: 10.1103/PhysRevC.34.2261
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1984FO22      Radiochim.Acta 35, 121 (1984)

M.Foshina, J.B.Martins, O.A.P.Tavares, V.di Napoli

Systematics of Spallation Yields with a Four-Parameter Formula

NUCLEAR REACTIONS 51V(p, X), E=0.06-29 GeV; 55Mn(p, X), E=170 MeV; 56Fe(p, X), E=0.34-29 GeV; 59Co(p, X), E=370 MeV; Cu(p, X), E=0.34-24 GeV; 75As(p, X), E=0.49-29 GeV; 93Nb(p, X), E=0.5-0.72 GeV; calculated spallation yields, fragment charge, mass yield distributions; deduced model parameters. Semi-empirical four-parameter formula.

1982DE22      Nucl.Instrum.Methods 197, 417 (1982)

H.G.De Carvalho, J.B.Martins, E.L.Medeiros, O.A.P.Tavares

Decay Constant for the Spontaneous-Fission Process in 238U

RADIOACTIVITY, Fission 238U(SF); measured decay constant. Etched track technique.

doi: 10.1016/0167-5087(82)90337-4
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1979DI09      J.Inorg.Nucl.Chem. 41, 895 (1979)

V.di Napoli, M.L.Terranova, J.B.Martins, J.D.Pinheiro Filho, O.A.P.Tavares

Intermediate-Energy Isomeric Ratios of Some Photospallation Residuals From Targets in the Vanadium-Cobalt Region

NUCLEAR REACTIONS 51V, 55Mn, Fe, Co(γ, xnyp), E=0.3-1 GeV; measured production σ for 44Sc, 34Cl, 54Mn.

doi: 10.1016/0022-1902(79)80290-0
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1978DI02      Lett.Nuovo Cim. 21, 83 (1978)

V.di Napoli, M.L.Terranova, J.B.Martins, O.A.P.Tavares

A Modified Mass Yield Formula for Intermediate-Energy Photospallation Of Medium-Weight Nuclei

NUCLEAR REACTIONS 39K, 40Ca, 51V, 55Mn, Fe, 59Co, Cu(γ, X); calculated yields of 24Na.

doi: 10.1007/BF02762793
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1978DI03      J.Inorg.Nucl.Chem. 40, 175 (1978)

V.di Napoli, F.Salvetti, M.L.Terranova, H.G.de Carvalho, J.B.Martins, O.A.P.Tavares

Photodisintegration of Light and Medium Weight Nuclei at Intermediate Energies-III

NUCLEAR REACTIONS 51V, 55Mn, 59Co, Fe(γ, X), E=0.3-1.0 GeV; measured σ(E, A, Z).

doi: 10.1016/0022-1902(78)80106-7
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1978DI06      J.Inorg.Nucl.Chem. 40, 1619 (1978)

V.di Napoli, J.B.Martins, G.Rosa, F.Salvetti, O.A.P.Tavares, M.L.Terranova, H.G.de Carvalho

Photodisintegration of Light and Medium-Weight Nuclei at Intermediate Energies-IV. Photoproduction of 7Be and 11C from Targets with Masses up to 40

NUCLEAR REACTIONS 19F, 27Al, 28Si, 32S, 10,11B(γ, 7Be), 19F, 27Al, 28Si, 32S, 14N, 16O(γ, 11C), E=0.3-1.0 GeV; measured σ(E).

doi: 10.1016/0022-1902(78)80336-4
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1978DI12      Lett.Nuovo Cim. 23, 424 (1978)

V.Di Napoli, M.L.Terranova, J.B.Martins, J.D.Pinheiro Filho, O.A.P.Tavares

Ineffectiveness of the Quasi-Deuteron Mechanism of Interaction in Yielding (γ, Nucleon) Reactions on Complex Nuclei

NUCLEAR REACTIONS 9Be, 14N, 30Si, 40Ca, 75As, 127I, 209Bi(γ, n), (γ, p), (γ, np); calculated σ. Levinger quasi-deuteron model. Valid up to 150 MeV.

doi: 10.1007/BF02787003
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1977DI16      J.Inorg.Nucl.Chem. 39, 1727 (1977)

V.di Napoli, M.L.Terranova, H.G.de Carvalho, J.B.Martins, J.D.Pinheiro Filho, O.A.P.Tavares

Cross Sections of (γ, nn) Reactions in Complex Nuclei at Intermediate Energies

NUCLEAR REACTIONS 209Bi, 59Co(γ, 3n), (γ, 4n), 209Bi(γ, 2n), 51V(γ, 3n), E=0.3-1.0 GeV bremsstrahlung; measured σ(E). 9Be, 12C, 16O, 59Co, 103Rh, 127I, 197Au, 209Bi(γ, 2n), 51V, 59Co, 75As, 89Y, 127I, 197Au, 209Bi(γ, 3n), 55Mn, 59Co, 75As, 127I, 209Bi(γ, 4n); calculated σ.

doi: 10.1016/0022-1902(77)80191-7
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1976DI01      J.Inorg.Nucl.Chem. 38, 1 (1976)

V.di Napoli, G.Rosa, F.Salvetti, M.L.Terranova, H.G.de Carvalho, J.B.Martins, O.A.P.Tavares

Photodisintegration of Light and Medium-Weight Nuclei at Intermediate Energies-II

NUCLEAR REACTIONS 40Ca(γ, 7Be), (γ, 11C), E=0.3-1.0 GeV bremsstrahlung ; measured σ(E); deduced reaction mechanism.

doi: 10.1016/0022-1902(76)80038-3
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1976MA62      Lett.Nuovo Cim. 15, 364 (1976)

J.B.Martins, O.A.P.Tavares, M.L.Terranova, V.di Napoli

Some Remarks on 13N Photoproduction from 16O and 19F at Intermediate Energies

NUCLEAR REACTIONS 16O(γ, 2np), 19F(γ, 4n2p), E=0.3-1 GeV; measured σ.

doi: 10.1007/BF02725898
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1975DE34      Lett.Nuovo Cim. 14, 615 (1975)

H.G.de Carbalho, J.B.Martins, O.A.P.Tavares, V.di Napoli, M.L.Terranova, K.Tesch

Photofission Cross-Sections of 209Bi, 232Th and 238U Above 1 GeV

NUCLEAR REACTIONS 209Bi(γ, F), E=1-16 GeV; 232Th, 238U(γ, F), E=1-5.5 GeV; measured σ.

doi: 10.1007/BF02743343
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1975DI03      J.Inorg.Nucl.Chem. 37, 1101 (1975)

V.di Napoli, G.Rosa, F.Salvetti, M.L.Terranova, H.G.de Carvalho, J.B.Martins, O.A.P.Tavares

Photodisintegration of Light and Medium-Weight Nuclei at Intermediate Energies. I. Photoproduction of 18F, 22Na, and 24Na from Targets with Masses up to 40

NUCLEAR REACTIONS 23Na, 27Al, 28Si, 31P, 32S, 35,37Cl, 39K, 40Ca(γ, X), E=0.3-1 GeV bremsstrahlung; measured photoproduction cross sections for 18F, 22,24Na.

doi: 10.1016/0022-1902(75)80451-9
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1972DE37      Lett.Nuovo Cim. 4, 365 (1972)

H.G.De Carvalho, J.B.Martins, O.A.P.Tavares, R.A.M.S.Nazareth, V.di Napoli

Some Remarks on the Transparency of Complex Nuclei to Photoproduced Charged Pions at Intermediate Energies

doi: 10.1007/BF02756536
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1971DE43      Lett.Nuovo Cim. 2, 1139 (1971)

H.G.de Carvalho, J.B.Martins, O.A.P.Tavares, R.A.M.S.Nazareth, V.di Napoli

Transparencies of Complex Nuclei to Photoproduced Pions and Recoil Nucleons

NUCLEAR REACTIONS 12C, 27Al, 55Mn, 100Ru, 209Bi, 238U(π0, X), (π+, X), (n, X), (p, X), E < 500 MeV; calculated nuclear transparencies.

doi: 10.1007/BF02757184
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