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NSR database version of April 11, 2024.

Search: Author = A.P.Ramirez

Found 16 matches.

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2023JO08      Phys.Rev. C 108, 024315 (2023)

S.R.Johnson, R.V.F.Janssens, U.Friman-Gayer, B.A.Brown, B.P.Crider, S.W.Finch, Krishichayan, D.R.Little, S.Mukhopadhyay, E.E.Peters, A.P.D.Ramirez, J.A.Silano, A.P.Tonchev, W.Tornow, S.W.Yates

Testing shell-model interactions at high excitation energy and low spin: Nuclear resonance fluorescence in 74Ge

NUCLEAR REACTIONS 74Ge(polarized γ, γ'), E=3.1-5.44 MeV; measured Eγ, Iγ, γ(θ); deduced integrated exclusive scattering σ(E). 74Ge; deduced levels, J, π, branching ratios, transition intensities. Comparison to large-scale shell-model calculations with jj44b and JUN45 effective interactions. γ3-setup consisting of 6 HPGe detectors. Quasi-monoenergetic linearly polarized photon beams produced via Compton backscattering and provided by the High Intensity Gamma-Ray Source at TUNL.

doi: 10.1103/PhysRevC.108.024315
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Data from this article have been entered in the XUNDL database. For more information, click here.


2023MA16      Appl.Radiat.Isot. 195, 110742 (2023)

A.M.Marenco, G.Rusev, E.M.Bond, T.A.Bredeweg, S.W.Finch, J.R.Garcia, M.E.Gooden, Krishichayan, R.C.Malone, W.A.Moody, A.P.D.Ramirez, J.A.Silano, A.P.Tonchev, W.Tornow

Cross section for inelastic neutron scattering from 193Ir at 6 MeV

NUCLEAR REACTIONS 193Ir, Ir(n, n')193mIr, E=6 MeV; measured reaction products, X-rays; deduced σ. Comparison with available data, ENDF/B-VIII.0 library. The tandem lab of TUNL.

doi: 10.1016/j.apradiso.2023.110742
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2023RA05      Phys.Rev. C 107, 054608 (2023)

A.P.D.Ramirez, J.A.Silano, R.C.Malone, M.A.Stoyer, A.P.Tonchev, M.E.Gooden, J.B.Wilhelmy, S.W.Finch, C.R.Howell, Krishichayan, W.Tornow

Fission product yields from the 238U(n, f) reaction at En = 4.6 MeV

NUCLEAR REACTIONS 238U(n, F)86mKr/86Kr/88Kr/89Rb/91Sr/92Sr/94Y/97Nb/101Mo/104Tc/105Ru/129Sb/131Te/131Sb/133I/134Te/134I/135Xe/138Xe/138Cs/139Ba/141Ba/142Ba/142La/146Ce/146Pr/147Pr/84As/86Se/86Br/87Br/88Br/89Kr/90Kr/91Kr/91Rb/92Kr/93Kr/93Rb/93Sr/94Rb/94Sr/95Sr/96Sr/96mY/96Y/97mY/98Sr/98mY/99Zr/99Nb/100Y/100Zr/101Zr/101Nb/102Zr/103Tc/106Tc/130Sn/132Sn/133Sb/134mSb/135Te/136Te/136mI/137Xe/138I/139Xe/140Xe/140Cs/141Xe/142Cs/142Ba/143Cs/143Ba/144La/145Ce/148La, E=4.6 MeV; measured neutron time-of-flight, Eγ, Iγ; deduced cumulative fission product yields. Comparison to experimental and evaluated data from ENDF/B-VIII.0 and JEFF-3.3 libraries and with theoretical models using the GEF and FREYA codes. Cyclic activation technique using the RApid Belt-driven Irradiated Target Transfer System (RABITTS) at the 10 MV tandem Van de Graaff accelerator (TUNL).

doi: 10.1103/PhysRevC.107.054608
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2023SC05      Phys.Rev. C 107, 044312 (2023)

N.Schunck, M.Verriere, G.Potel Aguilar, R.C.Malone, J.A.Silano, A.P.D.Ramirez, A.P.Tonchev

Microscopic calculation of fission product yields for odd-mass nuclei

NUCLEAR REACTIONS 236,238U(n, F), E=2.2-7.2 MeV; calculated mass distribution of the light fission fragment before prompt emission, fission fragment mass distribution after neutron emission, ratio of neutron over proton numbers in the fission fragments, axial quadrupole and octupole deformation in the fission fragments, probability to populate a given spin projection. Hartree-Fock-Bogoliubov theory with Skyrme energy functionals combined with FREYA calculations. Comparison to available experimental data, GEF-2021/1.1 calculations and ENDF/B-VIII.0, JEFF-3.3, and JENDL-5 evaluations.

NUCLEAR STRUCTURE 237,239U; calculated levels, J, π, spectrum of quasi-bound states for each spin projection, potential energy curves in as a function of the axial quadrupole moment. Generator coordinate method with Gaussian overlap approximation.

doi: 10.1103/PhysRevC.107.044312
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2022LE11      Phys.Rev. C 106, 044302 (2022)

S.R.Lesher, A.Aprahamian, K.Lee, B.Alemayehu, L.M.Clark, X.James, J.C.T.Lowrie, M.Meier, L.McEwan, S.Mukhopadhyay, E.E.Peters, A.P.D.Ramirez, M.Ryan, B.G.Rice, A.Stratman, E.Temanson, J.R.Vanhoy, S.W.Yates

Lifetime measurements of 0+ states in 168Er with the Doppler-shift attenuation method

NUCLEAR REACTIONS 168Er(n, n'γ), E=1.2-3.0 MeV in 0.1 MeV steps; measured Eγ, Iγ, excitation functions, γ(θ), level T1/2 by Doppler-shift attenuation method (DSAM) at the University of Kentucky Accelerator Laboratory. 168Er; deduced levels, J, π, excited 0+ states, bands, multipole mixing ratios, B(E2), B(E1). Comparison with previous experimental results, and with evaluated data in the ENSDF database. Systematics of low-lying levels and B(E2) values in 162,164,166,168,170Er.

doi: 10.1103/PhysRevC.106.044302
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022RA12      Nucl.Phys. A1023, 122446 (2022)

A.P.D.Ramirez, E.E.Peters, J.R.Vanhoy, S.F.Hicks, L.A.Alasagas, D.K.Alcorn-Dominguez, S.T.Block, S.T.Byrd, E.A.Chouinard, B.M.Combs, B.P.Crider, E.C.Derdyn, L.Downes, J.A.Erlanson, S.E.Evans, A.J.French, E.A.Garza, J.Girgis, T.D.Harrison, S.L.Henderson, T.J.Howard, D.T.Jackson, L.J.Kersting, A.Kumar, S.H.Liu, C.J.Lueck, E.M.Lyons, P.J.McDonough, M.T.McEllistrem, T.J.Morin, S.Mukhopadhyay, T.A.Nguyen, M.Nickel, S.Nigam, R.L.Pecha, J.Potter, F.M.Prados-Estevez, B.G.Rice, T.J.Ross, Z.C.Santonil, J.Schneiderjan, L.C.Sidwell, A.J.Sigillito, J.L.Steves, B.K.Thompson, D.W.Watts, Y.Xiao, S.W.Yates

Neutron elastic and inelastic scattering differential cross sections on carbon

NUCLEAR REACTIONS C(n, n), (n, n'), E=0.5-8 MeV; measured reaction products, En, In, TOF; deduced σ(θ). Comparison with ENDF/B-VIII.0 library. The Univ ersity of Kentucky Accelerator Laboratory (UKAL).

doi: 10.1016/j.nuclphysa.2022.122446
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14784.


2022RA13      Nucl.Phys. A1024, 122474 (2022)

A.P.D.Ramirez, E.E.Peters, S.Mukhopadhyay, M.T.McEllistrem, S.W.Yates, E.C.Derdeyn, S.F.Hicks, E.M.Lyons, T.J.Morin, J.R.Vanhoy

Neutron elastic and inelastic cross section measurements on silicon from 0.8-8 MeV

NUCLEAR REACTIONS Si(n, n), (n, n'), E=0.8-8 MeV; measured reaction products, En, In; deduced σ(θ), σ. Comparison with ENDF/B-VIII.0, JEFF-3.3, JENDL-4.0 data evaluations, TALYS-1.95 nuclear reaction code calculations. The University of Kentucky Accelerator Laboratory (UKAL).

doi: 10.1016/j.nuclphysa.2022.122474
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2019DH01      Nucl.Sci.Eng. 193, 1033 (2019)

S.Dhakal, C.R.Brune, T.N.Massey, S.M.Grimes, A.V.Voinov, S.Akhtar, An.P.D.Ramirez, A.L.Richard

Investigation of Neutron Cross Section for Iron in the ENDF Library wiTh. Pulsed Sphere Measurements

NUCLEAR REACTIONS 56Fe(n, n), (n, n'), E=7.2-10 MeV; measured reaction products, En, In; deduced σ. Comparison with MCNP simulations, ENDF/B libraries.

doi: 10.1080/00295639.2019.1591095
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2019EV01      Phys.Rev. C 99, 024306 (2019)

L.J.Evitts, A.B.Garnsworthy, T.Kibedi, J.Smallcombe, M.W.Reed, A.E.Stuchbery, G.J.Lane, T.K.Eriksen, A.Akber, B.Alshahrani, M.de Vries, M.S.M.Gerathy, J.D.Holt, B.Q.Lee, B.P.McCormick, A.J.Mitchell, M.Moukaddam, S.Mukhopadhyay, N.Palalani, T.Palazzo, E.E.Peters, A.P.D.Ramirez, T.Tornyi, S.W.Yates

E0 transition strength in stable Ni isotopes

NUCLEAR REACTIONS 58,60,62Ni(p, p'), E=4.7-9.2 MeV; measured Eγ, Iγ, γ(θ), conversion electrons using the CAESAR array for γ detection and Super-e spectrometer for electron detection at ANU-Canberra. 58,60,62Ni(n, n'), E=2.42, 2.90 MeV; measured Eγ, Iγ, level half-lives by DSAM at the University of Kentucky Accelerator Laboratory. 58,60,62Ni; deduced levels, J, π, K-conversion coefficients, E2/M1 multipole mixing ratios and E0 admixtures in 2+ to 2+ transitions, 0+ to 0+ E0 transitions, electric monopole (E0) transition strengths, B(M1), B(E2). Comparison with evaluated data in Nuclear Data Sheets. Systematics of 2+ to 2+ and 0+ to 0+ monopole transition strengths ρ2(E0) in even-even nuclei with A<250.

doi: 10.1103/PhysRevC.99.024306
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Data from this article have been entered in the XUNDL database. For more information, click here.


2018EV01      Phys.Lett. B 779, 396 (2018)

L.J.Evitts, A.B.Garnsworthy, T.Kibedi, J.Smallcombe, M.W.Reed, B.A.Brown, A.E.Stuchbery, G.J.Lane, T.K.Eriksen, A.Akber, B.Alshahrani, M.de Vries, M.S.M.Gerathy, J.D.Holt, B.Q.Lee, B.P.McCormick, A.J.Mitchell, M.Moukaddam, S.Mukhopadhyay, N.Palalani, T.Palazzo, E.E.Peters, A.P.D.Ramirez, S.R.Stroberg, T.Tornyi, S.W.Yates

Identification of significant E0 strength in the 2+2 → 2+1 transitions of 58, 60, 62Ni

NUCLEAR REACTIONS 58,60,62Ni(p, p'), E<9.2 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, nuclear and quadrupole moments, B(E2), B(M1). Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2018.01.076
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Data from this article have been entered in the XUNDL database. For more information, click here.


2018VA02      Nucl.Phys. A972, 107 (2018)

J.R.Vanhoy, S.H.Liu, S.F.Hicks, B.M.Combs, B.P.Crider, A.J.French, E.A.Garza, T.Harrison, S.L.Henderson, T.J.Howard, M.T.McEllistrem, S.Nigam, R.L.Pecha, E.E.Peters, F.M.Prados-Estevez, A.P.D.Ramirez, B.G.Rice, T.J.Ross, Z.C.Santonil, L.C.Sidwell, J.L.Steves, B.K.Thompson, S.W.Yates

54Fe neutron elastic and inelastic scattering differential cross sections from 2-6 MeV

NUCLEAR REACTIONS 54Fe(n, n), (n, n'), E=2-6 MeV; measured En, In(θ); deduced σ(θ); calculated σ(θ) using coupled channels, TALYS, DWBA code ECIS06; deduced increase of DWBA deformation parameter above 4 MeV by about 1/4 using fit to the data.

doi: 10.1016/j.nuclphysa.2018.02.004
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14451.


2017RA12      Phys.Rev. C 95, 064605 (2017)

A.P.D.Ramirez, J.R.Vanhoy, S.F.Hicks, M.T.McEllistrem, E.E.Peters, S.Mukhopadhyay, T.D.Harrison, T.J.Howard, D.T.Jackson, P.D.Lenzen, T.D.Nguyen, R.L.Pecha, B.G.Rice, B.K.Thompson, S.W.Yates

Neutron scattering cross section measurements for 56Fe

NUCLEAR REACTIONS 56Fe(n, n), (n, n'), E=1.30-7.96 MeV; measured E(n), I(n), σ(E, θ) using a C6D6 liquid scintillation detector and time-of-flight techniques at the University of Kentucky Accelerator Laboratory. Comparison with previous experimental data, evaluations in ENDF, JENDL, and JEFF databases, and with theoretical calculations using different optical model potentials in TALYS and EMPIRE codes.

doi: 10.1103/PhysRevC.95.064605
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14462.


2016PE13      Phys.Rev. C 94, 024313 (2016)

E.E.Peters, T.J.Ross, S.F.Ashley, A.Chakraborty, B.P.Crider, M.D.Hennek, S.H.Liu, M.T.McEllistrem, S.Mukhopadhyay, F.M.Prados-Estevez, A.P.D.Ramirez, J.S.Thrasher, S.W.Yates

0+states in 130, 132Xe: A search for E(5) behavior

NUCLEAR REACTIONS 130Xe(n, n'), E=2.0, 2.5 MeV; 132Xe(n, n'), E=2.2, 2.7 MeV; measured Eγ, Iγ, γ(θ), cross sections for level population, level half-lives by DSAM at the University of Kentucky Van de Graaff accelerator facility. 130,132Xe; deduced levels, J, π, γ-branching ratios, multipolarity, mixing ratio, B(E2). Discussed E(5) critical-point symmetry. Comparison of experimental cross sections with statistical model calculations. Systematics of energies and B(E2) of first 2+ states and E(first 4+)/E(first 2+) ratios in N=56-90 even-A Xe isotopes taken from the ENSDF database.

doi: 10.1103/PhysRevC.94.024313
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Data from this article have been entered in the XUNDL database. For more information, click here.


2015RA11      Phys.Rev. C 92, 014303 (2015)

A.P.D.Ramirez, A.V.Voinov, S.M.Grimes, Y.Byun, C.R.Brune, T.N.Massey, S.Akhtar, S.Dhakal, C.E.Parker

Level density and mechanism of deuteron-induced reactions on 54, 56, 58Fe

NUCLEAR REACTIONS 54,56,58Fe(d, d), (d, n), (d, p), (d, α), E=5, 7, 9 MeV; measured neutron, protons, deuterons, and α particle spectra, σ(θ, E) at Ohio University tandem accelerator facility. 55,57,59Co, 55,57Fe, 52,54,56Mn; deduced nuclear level densities of the residual nuclei from best fit to compound double differential cross sections, and compared with Gilbert-Cameron model using Iljinov parameter systematics. Comparison with theoretical cross sections using Hartree-Fock-Bogoliubov method (HFBM) and Gilbert-Cameron model (GCM).

doi: 10.1103/PhysRevC.92.014303
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2164.


2014BY06      Phys.Rev. C 90, 044303 (2014)

Y.Byun, A.P.D.Ramirez, S.M.Grimes, A.V.Voinov, C.R.Brune, T.N.Massey

Deuteron-induced reactions on 89Y and nuclear level density of 90Zr

NUCLEAR REACTIONS 89Y(d, d), (d, n), (d, p), E=5, 6, 7.44 MeV; measured deuteron spectra, E(n), I(n), E(p), I(p), σ(E, θ), angle-integrated σ(E) at Ohio University tandem accelerator facility. 90Zr; deduced levels, J, π, configuration, level densities. Comparison with microscopic HFB model calculations using EMPIRE code.

doi: 10.1103/PhysRevC.90.044303
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2013RA32      Phys.Rev. C 88, 064324 (2013)

A.P.D.Ramirez, A.V.Voinov, S.M.Grimes, A.Schiller, C.R.Brune, T.N.Massey, A.Salas-Bacci

Nuclear level densities of 64, 66Zn from neutron evaporation

NUCLEAR REACTIONS 63Cu(d, n)64Zn, 65Cu(d, n)66Zn, E=6, 7.5 MeV; measured E(n), I(n), n(θ), σ(E, θ) using TOF technique at Edwards accelerator facility, Ohio University. Analysis by exciton model of nuclear reactions. Comparison with Hauser-Feshbach model calculations using EMPIRE and TALYS computer codes. Tested Fermi gas model, Gilber-Cameron model, and microscopic combinatorial approach with Hartree-Fock-Bogoliubov method (HFBM). 64,66Zn; deduced level densities versus the excitation energy.

doi: 10.1103/PhysRevC.88.064324
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2087.


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