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NSR database version of April 27, 2024.

Search: Author = L.Neufcourt

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2021HA47      Nat.Phys. 17, 1408 (2021)

A.Hamaker, E.Leistenschneider, R.Jain, G.Bollen, S.A.Giuliani, K.Lund, W.Nazarewicz, L.Neufcourt, C.R.Nicoloff, D.Puentes, R.Ringle, C.S.Sumithrarachchi, I.T.Yandow

Precision mass measurement of lightweight self-conjugate nucleus ⁸⁰Zr

ATOMIC MASSES ^80,81,82,83Zr; measured time of flight, frequencies; deduced mass excesses, weighted average frequency ratio. Comparison with AME20. Low Energy Beam and Ion Trap (LEBIT) facility.

doi: 10.1038/s41567-021-01395-w
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2020NE02      Phys.Rev. C 101, 014319 (2020)

L.Neufcourt, Y.Cao, S.Giuliani, W.Nazarewicz, E.Olsen, O.B.Tarasov

Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei

RADIOACTIVITY ¹⁹Mg, ⁴⁵Fe, ⁴⁸Ni, ⁵⁴Zn, ⁶⁷Kr(2p); calculated Q(2p) using eleven global mass models: Skyrme models SkM*, SkP, SLy4, SV-min, UNEDF0, UNEDF1, UNEDF2, BCPM and D1M, FRDM-2012 and HFB-24, and Bayesian model averaging (BMA) results: BMA-0, BMA-I, BMA-II, BMA-III, and comparing with experimental data from AME2016 and later literature. Z=17-82; calculated nuclear binding-energy, and probability of proton decay, relative to the neutron number of the lightest proton-bound isotope with known experimental S(p) or S(2p), in the proton-rich region using BMA-I and BMA-II model averaging methods. ^25,26,27S, ^29,30,31Ar, ^33,34,35Ca, ^37,38,39Ti, ^40,41,42,43Cr, ^44,45,46Fe, ^47,48,49,50Ni, ^52,53,54,55Zn, ^56,57,58,59Ge, ^61,62,63,64Se, ^{64,65,66,67,68}Kr, ^{68,69,70,71,72}Sr, ^{72,73,74,75,76}Zr, ^{76,77,78,79,80}Mo, ^{80,81,82,83,84}Ru, ^{83,84,85,86,87,88}Pd, ^{87,88,89,90,91}Cd, ^{91,92,93,94,95}Sn, ^{100,101,102,103}Te, ^{104,105,106,107}Xe, ^{108,109,110,111,112}Ba, ^{111,112,113,114,115,116}Ce, ^{115,116,117,118,119}Nd, ^{119,120,121,122,123,124}Sm, ^{123,124,125,126,127,128,129}Gd, ^{128,129,130,131,132,133,134}Dy, ^{131,132,133,134,135,136,137}Er, ^{135,136,137,138,139,140,141,142}Yb, ^{141,142,143,144,145,146,147}Hf, ^{145,146,147,148,149,150}W, ^{150,151,152,153,154,155}Os, ^{152,153,154,155,156,157,158}Pt, ^{156,157,158,159,160,161,162}Hg(2p); calculated Q(2p) and half-lives using BMA-1 method. ³⁰Ar, ³⁴Ca, ³⁹Ti, ⁴²Cr, ⁵⁸Ge, ⁶²Se, ⁶⁶Kr, ⁷⁰Sr, ⁷⁴Zr, ⁷⁸Mo, ⁸²Ru, ⁸⁶Pd, ⁹⁰Cd, ¹⁰³Te; predicted as most promising 2p emitters. ^131,132Dy, ^134,135Er, ^144,145Hf; predicted as excellent candidates for the sequential emission of two protons. Bayesian Gaussian processes for separation-energy residuals and combined via Bayesian model averaging for mass predictions, with uncertainty quantification of theoretical predictions.

doi: 10.1103/PhysRevC.101.014319
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2020NE04      Phys.Rev. C 101, 044307 (2020)

L.Neufcourt, Y.Cao, S.A.Giuliani, W.Nazarewicz, E.Olsen, O.B.Tarasov

Quantified limits of the nuclear landscape

NUCLEAR STRUCTURE Z=5-119, N=11-293; calculated S(n) for odd-N. Z=8-119, N=20-296; calculated S(2n) for even-N. Z=25-119, N-21-176; calculated S(p) for odd-Z. Z=14-118, N=8-170; calculated S(2p) for even-Z. Quantified predictions of proton and neutron separation energies and Bayesian probabilities of existence of particle-bound isotopes throughout the nuclear landscape using nuclear density-functional theory with several energy density functionals, together with current global mass models and experimental atomic mass data in the general framework of Bayesian model averaging (BMA); deduced existence of 7759 particle-bound nuclei with Z<120, having existence probability of >0.5. Relevance to discovery potential with modern radioactive ion-beam facilities, such as FRIB at MSU.

doi: 10.1103/PhysRevC.101.044307
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2019KI05      Phys.Rev.Lett. 122, 232502 (2019)

G.B.King, A.E.Lovell, L.Neufcourt, F.M.Nunes

Direct Comparison between Bayesian and Frequentist Uncertainty Quantification for Nuclear Reactions

NUCLEAR REACTIONS ⁴⁸Ca, ⁹⁰Zr, ²⁰⁸Pb(p, p), (n, n), E<35 MeV; analyzed available data; deduced σ(θ).

doi: 10.1103/PhysRevLett.122.232502
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2019NE02      Phys.Rev.Lett. 122, 062502 (2019)

L.Neufcourt, Y.Cao, W.Nazarewicz, E.Olsen, F.Viens

Neutron Drip Line in the Ca Region from Bayesian Model Averaging

NUCLEAR STRUCTURE ^{50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82}Ca, ⁵²Cl, ⁵³Ar, ⁴⁹S; calculated one- and two-neutron separation energies, posterior probability of existence of neutron-rich nuclei in the Ca region.

doi: 10.1103/PhysRevLett.122.062502
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2018NE08      Phys.Rev. C 98, 034318 (2018)

L.Neufcourt, Yu.Cao, W.Nazarewicz, F.Viens

Bayesian approach to model-based extrapolation of nuclear observables

ATOMIC MASSES Z=2-110, N=4-160; analyzed S(2n) of even-even nuclei from AME-2003 and AME-2016 evaluations, JYFLTRAP experimental data, and various global mass models; calculated S(2n), residuals of S(2n) for six global mass models, and S(2n) credibility interval to extrapolated nuclei with the chain of Sn nuclei as a representative example using Bayesian Gaussian processes and neural networks.

doi: 10.1103/PhysRevC.98.034318
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