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NSR database version of May 8, 2024.

Search: Author = E.L.Medeiros

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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 T_1/2 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, ^{258,262,264,266}Sg, ^274,276Hs, ^278,280,282Cn, ²⁸⁴Fl(α); calculated T_1/2 and compared with experimental values.

doi: 10.1103/PhysRevC.106.024608
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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 ^{159,161,174,176}Hf(α); analyzed available data; calculated T_1/2, 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
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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 T_1/2, partial T_1/2 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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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 T_1/2 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 T_1/2, Q-values, branching ratios. Comparison with available data.

doi: 10.1088/0031-8949/86/01/015201
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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 ^{166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,192,194,195,196,198}Pt(α);calculated T_1/2. 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 T_1/2 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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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 T_1/2.

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, ^{164,165,166,167}Ir, ^170,171,173Au, ^176,177Tl, ^184,185,186Bi(p); calculated proton-decay partial T_1/2. Semi-empirical model including effect of deformation.

doi: 10.1140/epja/i2007-10513-4
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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 T_1/2; deduced parameters.

RADIOACTIVITY ¹¹⁰Te, ¹¹³I, ¹⁵¹Gd, ¹⁷⁴Hf, ¹⁶³Ta, ¹⁸⁰W, ¹⁸⁴Os, ²¹⁰Po, ^{200,206,208,211,218}At, ^203,228Ra, ²³¹Pa, ²⁵⁰Cm, ²⁶⁶Sg, ²⁷²Rg(α); calculated α-decay partial T_1/2. 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 T_1/2.

doi: 10.1088/0954-3899/32/11/N01
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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 ^{166,167,168,170,171,172,174,175,176,177,178,180,181,182,183,184,186,188}Pt(α); analyzed T_1/2, Qα; deduced parameters. ¹⁹⁰Pt(α); calculated T_1/2. 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 ^{187,189,191,193,195,197,199,200,201,202,203,204,205,206,207,208,209,211,212,213,214}Bi(α); calculated α-decay partial T_1/2. Comparison with data.

doi: 10.1088/0954-3899/31/2/005
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2004GO61      Braz.J.Phys. 34, 919 (2004)

M.Goncalves, E.C.de Oliveira, E.L.Medeiros, S.de Pina, S.B.Duarte

Hot Hypernucleus Formation in High-Energy Photonuclear Reactions

NUCLEAR REACTIONS C, Al, Ni(γ, X), E=1.2 GeV; calculated fragment charge and mass distributions, hypernucleus yields.

doi: 10.1590/s0103-97332004000500057
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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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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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2000GO11      Eur.Phys.J. A 7, 435 (2000)

M.Goncalves, M.Chiapparini, L.Castro, E.C.de Oliveira, S.B.Duarte, E.L.Medeiros

Multiparticle Correlations in Resonance-Matter Formation

NUCLEAR REACTIONS ¹²C(¹²C, X), ²⁰Ne(²⁰Ne, X), ⁴⁰Ca(⁴⁰Ca, X), ⁵⁸Ni(⁵⁸Ni, X), E=1-2 GeV/nucleon; calculated maximum number of resonances, particle population, pion multiplicity, density time evolution. Intranuclear cascade model with particle correlations, comparison with data.

doi: 10.1007/s100500050414
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1998DE38      Phys.Lett. 434B, 1 (1998)

S.de Pina, E.C.de Oliveira, E.L.Medeiros, S.B.Duarte, M.Goncalves

Photonuclear K⁺ Production Calculation Near Threshold

NUCLEAR REACTIONS ¹H, ¹²C, ⁶⁴Cu, ²⁰⁸Pb(γ, K⁺X), E=0.85-1.2 GeV; calculated pion, kaon multiplicities. ¹²C(γ, K⁺X), E=0.8-1.1 GeV; calculated σ(θ). Comparison with data.

doi: 10.1016/S0370-2693(98)00726-6
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1997GO05      Phys.Rev. C55, 2625 (1997)

M.G.Goncalves, E.L.Medeiros, S.B.Duarte

Effect of Multiparticle Collisions on Pion Production in Relativistic Heavy-Ion Reactions

NUCLEAR REACTIONS ⁴⁰Ca(⁴⁰Ca, X), E=2 GeV/nucleon; calculated N-body collisions frequency time evolution. ⁴⁰Ca(⁴⁰Ca, X), E ≤ 2 GeV/nucleon; analyzed pion multiplicity data, other aspects; deduced multi-baryonic collisions role.

doi: 10.1103/PhysRevC.55.2625
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1997GO11      Phys.Lett. 406B, 1 (1997)

M.Goncalves, S.de Pina, D.A.Lima, W.Milomem, E.L.Medeiros, S.B.Duarte

Many-Body Cascade Calculation for Photonuclear Reactions

NUCLEAR REACTIONS ²⁷Al, ¹⁰⁰Ru(γ, X), E=0.5-1.5 GeV; calculated Δ resonance population, pion multiplicity, residual nucleus excitation energy, multiplicity of emitted nucleons, proton spectra. Many-body cascade approach, comparison with one-body cascade model.

doi: 10.1016/S0370-2693(97)00662-X
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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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