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NSR database version of May 20, 2024.

Search: Author = D.Ray

Found 14 matches.

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2024LO02      Phys.Rev.Lett. 132, 142502 (2024)

B.Longfellow, A.T.Gallant, G.H.Sargsyan, M.T.Burkey, T.Y.Hirsh, G.Savard, N.D.Scielzo, L.Varriano, M.Brodeur, D.P.Burdette, J.A.Clark, D.Lascar, K.D.Launey, P.Mueller, D.Ray, K.S.Sharma, A.A.Valverde, G.L.Wilson, X.L.Yan

Improved Tensor Current Limit from 8B β Decay Including New Recoil-Order Calculations

RADIOACTIVITY 8B(β+) [from 6Li(3He, n)8B, E not given]; measured decay products, Eα, Iα, Eβ, Iβ, α-α-β-coin.; deduced β-ν angular correlation coefficient impacted by 2+ intruder state, Gamow-Teller decays. Comparison with new ab initio symmetry-adapted no-core shell-model calculations, available data. The Beta-decay Paul Trap, Argonne National Laboratory, the ATLAS facility.

doi: 10.1103/PhysRevLett.132.142502
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2023HO14      Phys.Rev.Lett. 131, 262701 (2023)

D.E.M.Hoff, K.Kolos, G.W.Misch, D.Ray, B.Liu, A.A.Valverde, M.Brodeur, D.P.Burdette, N.Callahan, J.A.Clark, A.T.Gallant, F.G.Kondev, G.E.Morgan, M.R.Mumpower, R.Orford, W.S.Porter, F.Rivero, G.Savard, N.D.Scielzo, K.S.Sharma, K.Sieja, T.M.Sprouse, L.Varriano

Direct Mass Measurements to Inform the Behavior of 128mSb in Nucleosynthetic Environments

ATOMIC MASSES 128,128mSb; measured cyclotron frequencies; deduced mass excesses, isomer excitation energy. Comparison with AME2020, NUBASE2020, state-of-the-art shell model calculations using the GCN5082 interaction. The phase-imaging ion-cyclotron resonance (PI-ICR) technique with the Canadian Penning Trap (CPT) mass spectrometer at the Californium Rare Isotope Breeder Upgrade facility.

doi: 10.1103/PhysRevLett.131.262701
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2023LO04      Phys.Rev. C 107, L032801 (2023)

B.Longfellow, A.T.Gallant, T.Y.Hirsh, M.T.Burkey, G.Savard, N.D.Scielzo, L.Varriano, M.Brodeur, D.P.Burdette, J.A.Clark, D.Lascar, P.Mueller, D.Ray, K.S.Sharma, A.A.Valverde, G.L.Wilson, X.L.Yan

Determination of the 8B neutrino energy spectrum using trapped ions

RADIOACTIVITY 8B(β+) [from 3He(6Li, n)8B, E not given]; measured decay products, Eα, Iα, αα-coin, 8Be recoil energy; deduced 8Be final-state distribution (FSD) from 8B decay, neutrino energy spectra. Comparison to other experimental data. β-decay Paul trap (BPT) surrounded by double-sided silicon strip detectors (DSSDs) at ATLAS facility (ANL).

doi: 10.1103/PhysRevC.107.L032801
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2022BU16      Phys.Rev.Lett. 128, 202502 (2022)

M.T.Burkey, G.Savard, A.T.Gallant, N.D.Scielzo, J.A.Clark, T.Y.Hirsh, L.Varriano, G.H.Sargsyan, K.D.Launey, M.Brodeur, D.P.Burdette, E.Heckmaier, K.Joerres, J.W.Klimes, K.Kolos, A.Laminack, K.G.Leach, A.F.Levand, B.Longfellow, B.Maass, S.T.Marley, G.E.Morgan, P.Mueller, R.Orford, S.W.Padgett, A.Perez Galvan, J.R.Pierce, D.Ray, R.Segel, K.Siegl, K.S.Sharma, B.S.Wang

Improved Limit on Tensor Currents in the Weak Interaction from 8Li β Decay

RADIOACTIVITY 8Li(β-); measured decay products, Eβ, Iβ; deduced tensor currents in the low-energy regime by examining the β-ν correlation of trapped 8Li ions with the Beta-decay Paul Trap. Comparison with the standard model prediction.

doi: 10.1103/PhysRevLett.128.202502
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2022GA27      Phys.Rev. C 106, 045503 (2022)

N.D.Gamage, R.Sandler, F.Buchinger, J.A.Clark, D.Ray, R.Orford, W.S.Porter, M.Redshaw, G.Savard, K.S.Sharma, A.A.Valverde

Precise Q-value measurements of 112, 113Ag and 115Cd with the Canadian Penning trap for evaluation of potential ultralow Q-value β decays

RADIOACTIVITY 112,113Ag, 115Cd(β-); measured cyclotron frequency ratios of singly charged parent and daughter ions; deduced Q values of g.s to g.s decay, log ft, partial T1/2. On the basis of measured values and existing level schemes evaluated ultralow Q-values for potential decay branches to the excited states. Comparison to AME2020 evaluation. Canadian Penning trap mass spectrometer coupled to the californium rare isotope breeder upgrade (CARIBU) facility at ANL. Comparison to AME2020 evaluation.

ATOMIC MASSES 112,113Ag, 115Cd; measured cyclotron frequency; deduced mass excesses. Comparison to AME2020 evaluation.

doi: 10.1103/PhysRevC.106.045503
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2022OR02      Phys.Rev. C 105, L052802 (2022)

R.Orford, N.Vassh, J.A.Clark, G.C.McLaughlin, M.R.Mumpower, D.Ray, G.Savard, R.Surman, F.Buchinger, D.P.Burdette, M.T.Burkey, D.A.Gorelov, J.W.Klimes, W.S.Porter, K.S.Sharma, A.A.Valverde, L.Varriano, X.L.Yan

Searching for the origin of the rare-earth peak with precision mass measurements across Ce-Eu isotopic chains

ATOMIC MASSES 152,153,154Ce, 152,153,154,156,157Pr, 157Nd, 161Pm, 163,165Eu; measured cyclotron frequency; deduced mass excess, solar abundances of rare-earth elements. Comparison to AME2016 and AME2020 evaluations, previous experimental data and calculations using Markov chain Monte Carlo (MCMC) technique. Canadian Penning Trap (CPT) with low-energy ion beams from the Californium Rare Isotope Breeder Upgrade(CARIBU) facility at Argonne National Laboratory. Systematics of CPT mass-measurements for Ce, Pr, Nd, Pm, Sm, Eu (Z=58-63).

doi: 10.1103/PhysRevC.105.L052802
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2020IT01      Phys.Rev. C 101, 034304 (2020)

N.Itagaki, A.V.Afanasjev, D.Ray

Possibility of 14C cluster as a building block of medium-mass nuclei

NUCLEAR STRUCTURE 12,14C, 16O, 24,28Mg, 32S, 42Ar; calculated energies of 0+ states, principal quantum numbers, neutron density distribution contours, and elastic form factor of 12C, 14C, and 16O clusters, and treating 24Mg as 12C+12C, 28Mg as 14C+14C, 32S as 16O+16O, and 42Ar as 14C+14C+14C cluster structures. Antisymmetrized quasicluster model (AQCM), and cranked relativistic mean field (CRMF) calculations. Discussed role of the 14C cluster as a possible building block of cluster structures in medium-mass nuclei.

doi: 10.1103/PhysRevC.101.034304
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2020OR02      Nucl.Instrum.Methods Phys.Res. B463, 491 (2020)

R.Orford, J.A.Clark, G.Savard, A.Aprahamian, F.Buchinger, M.T.Burkey, D.A.Gorelov, J.W.Klimes, G.E.Morgan, A.Nystrom, W.S.Porter, D.Ray, K.S.Sharma

Improving the measurement sensitivity of the Canadian Penning Trap mass spectrometer through PI-ICR

ATOMIC MASSES 142I, 146La, 163Gd; measured frequencies; deduced mass excesses.

doi: 10.1016/j.nimb.2019.04.016
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2020OR03      Phys.Rev. C 102, 011303 (2020)

R.Orford, F.G.Kondev, G.Savard, J.A.Clark, W.S.Porter, D.Ray, F.Buchinger, M.T.Burkey, D.A.Gorelov, D.J.Hartley, J.W.Klimes, K.S.Sharma, A.A.Valverde, X.L.Yan

Spin-trap isomers in deformed, odd-odd nuclei in the light rare-earth region near N=98

ATOMIC MASSES 156,156m,158,160,160mPm, 158,160,160m,162,162m,164Eu, 162,162m,164,164m,166Tb; measured cyclotron frequency using the Canadian Penning Trap mass spectrometer at the CARIBU-ANL facility; deduced mass excesses, isomer excitation energies, Kπ, Nilsson configurations. Radioactive nuclei were produced in spontaneous fission of 252Cf source, filtered by A/Q, and purified by a multireflection time-of-flight mass separator (MR-TOF). Comparison with multiquasiparticle blocking calculations.

doi: 10.1103/PhysRevC.102.011303
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Data from this article have been entered in the XUNDL database. For more information, click here.

2017AG05      Phys.Rev. C 95, 054324 (2017)

S.E.Agbemava, A.V.Afanasjev, D.Ray, P.Ring

Assessing theoretical uncertainties in fission barriers of superheavy nuclei

NUCLEAR STRUCTURE 276,278,280,282,284,286,288,290,292,294,296Cn, 280,282,284,286,288,294,296,298Fl, 284,286,288,290,292,294,296,298,300Lv, 288,290,294,296,298,300,302,304,306Og, 292,294,296,298,300,302,304,306,308120; calculated heights of inner fission barriers. Z=96-126, N=140-196; calculated heights of inner fission barriers, binding energies of ground states, energies of saddle points. 296Cn; calculated deformation energy curves as function of β2. 284Cn, 300120; calculated potential energy surface contours in (β2cos(γ+30), β2sin(γ+30)) plane, with systematic and statistical uncertainties quantified, and benchmarking of the functionals to the experimental data on fission barriers. Covariant energy density functional (CEDF) theory based on the state-of-the-art functionals NL3*, DD-ME2, DD-MEd, DD-PC1, and PC-PK1, in the axially symmetric and triaxial relativistic Hartree-Bogoliubov (RHB) frameworks.

doi: 10.1103/PhysRevC.95.054324
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2016RA21      Phys.Rev. C 94, 014310 (2016)

D.Ray, A.V.Afanasjev

From superdeformation to extreme deformation and clusterization in the N ≈ Z nuclei of the A ≈ 40 mass region

NUCLEAR STRUCTURE 32,34S, 36,38Ar, 40,42,44Ca, 42Sc, 44,46Ti, 48,50Cr; calculated energies of the configurations versus angular momentum for triaxial normal-deformed, triaxial highly-deformed, superdeformed (SD), hyperdeformed (HD) and megadeformed (MD) structures, neutron single-particle energies (Routhians), transition quadrupole moments and γ deformations, proton density contours, kinematic and dynamic moments of inertia. Yrast structures and configurations showing the fingerprints of clusterization and molecular structures. Covariant density functional theory. The N=Z nuclei better candidates for the observation of extremely deformed structures.

doi: 10.1103/PhysRevC.94.014310
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2015AF01      Phys.Rev. C 91, 014324 (2015)

A.V.Afanasjev, S.E.Agbemava, D.Ray, P.Ring

Neutron drip line: Single-particle degrees of freedom and pairing properties as sources of theoretical uncertainties

NUCLEAR STRUCTURE Z=4-110, N=4-260; Z=70, N=78-180; calculated neutron pairing energies, neutron δ(2n)(Z, N) quantities between two-proton and two-neutron drip lines. Z=86, N=184-206; calculated neutron chemical potential, neutron quadrupole deformation β2, neutron pairing gap, neutron pairing energy, and neutron single-particle energies. 114Ge, 180Xe, 266Pb, 270Rn, 366Hs; calculated neutron single-particle states at spherical shape, neutron shell gaps at the 2n-drip lines, spread of theoretical predictions for the single-particle energies. 56Ni, 100,132Sn, 208Pb; calculated spread of theoretical predictions for the single-particle energies for doubly magic nuclei. Analyzed theoretical uncertainties in the prediction of the two-neutron drip line using covariant density functional theory (CEDFs) and several interactions.

doi: 10.1103/PhysRevC.91.014324
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2014AG08      Phys.Rev. C 89, 054320 (2014)

S.E.Agbemava, A.V.Afanasjev, D.Ray, P.Ring

Global performance of covariant energy density functionals: Ground state observables of even-even nuclei and the estimate of theoretical uncertainties

NUCLEAR STRUCTURE Z=2-120, N=2-280; calculated properties of ground states of even-even nuclei between the two-proton and two-neutron drip lines, binding energies, S(2n), S(2p), charge quadrupole-, hexadecapole- and isovector β2 deformations, charge radii, neutron skin thickness, positions of two-proton and two-neutron drip line, neutron and proton three-point indicators and pairing gaps, density, energy per particle, incompressibility, effective masses. Large-scale axial relativistic Hartree-Bogoliubov calculations with four modern covariant energy density functionals (CEDF) such as NL3*, DD-ME2, DD-MEd, and DD-PC1. Comparison with other calculations and experimental data. Also supplemental information available.

ATOMIC MASSES A=10-300; calculated masses, binding energies of 835 even-even nuclei and compared with experimental values. Large-scale axial relativistic Hartree-Bogoliubov calculations with four modern covariant energy density functionals (CEDFs).

doi: 10.1103/PhysRevC.89.054320
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2013AF02      Phys.Lett. B 726, 680 (2013)

A.V.Afanasjev, S.E.Agbemava, D.Ray, P.Ring

Nuclear landscape in covariant density functional theory

NUCLEAR STRUCTURE Z=1-120, N=1-300; calculated two-proton and neutron separation energies and dripline, neutron chemical potentials, quadrupole deformations. Skyrme density and covariant density functional theory calculations.

doi: 10.1016/j.physletb.2013.09.017
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