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NSR database version of May 20, 2024.

Search: Author = S.Upadhyayula

Found 17 matches.

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2023HU20      Phys.Rev. C 108, L051606 (2023)

C.Hunt, S.Ahn, J.Bishop, E.Koshchiy, E.Aboud, M.Alcorta, A.Bosh, K.Hahn, S.Han, C.E.Parker, E.C.Pollacco, B.T.Roeder, M.Roosa, S.Upadhyayula, A.S.Volya, G.V.Rogachev

Spectroscopy of 13Be through isobaric analog states in 13B

doi: 10.1103/PhysRevC.108.L051606
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022BA39      Phys.Rev. C 106, 054310 (2022)

M.Barbui, A.Volya, E.Aboud, S.Ahn, J.Bishop, V.Z.Goldberg, J.Hooker, C.H.Hunt, H.Jayatissa, Tz.Kokalova, E.Koshchiy, S.Pirrie, E.Pollacco, B.T.Roeder, A.Saastamoinen, S.Upadhyayula, C.Wheldon, G.V.Rogachev

α-cluster structure of 18Ne

NUCLEAR REACTIONS 4He(14O, α), E=61.8 MeV; measured reaction product, Eα, Iα, angular distribution; deduced σ(θ), excitation function of 18Ne. 18Ne; deduced resonances J, π, resonance total and partial widths. 18Ne, O; calculated levels J, π. Analysis with a multichannel R-matrix approach. Shell model with FSU interaction Hamiltonian calculations. Comparison with other experimental data. TexAT active target at magnetic achromat recoil separator (Cyclotron Institute at Texas AM University).

doi: 10.1103/PhysRevC.106.054310
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022BU13      Phys.Rev. C 105, 045805 (2022)

S.Burcher, K.A.Chipps, R.O.Hughes, C.S.Reingold, A.Saastamoinen, J.T.Harke, N.Cooper, S.Ahn, J.M.Allmond, H.Clark, J.A.Cizewski, M.R.Hall, J.Hooker, H.Jayatissa, K.L.Jones, S.Ota, S.D.Pain, K.Schmidt, A.Simon, S.Upadhyayula

Developing the32S(p, d)31S*(p)(γ) reaction to probe the 30P(p, γ)31S reaction rate in classical novae

NUCLEAR REACTIONS 32S(p, d), E=33 MeV; measured reaction products, Ep, Ip, Eγ, Iγ, deuteron spectra, (deuteron)p-coin, (particle)γ-coin, angular distributions; deduced s(θ). 31S; deduced levels, J, π, proton decay width of excited states, proton decay branching ratios. DWBA analysis. Comparison to other experimental data. Discussed relevance to resonances investigations in astrophysically important 30P(p, γ) reaction. Hyperion setup consisting of 12 Compton-suppressed HPGe clover detectors, a silicon telescope downstream of the target, and a single silicon detector upstream of the target at K150 cyclotron (Texas A-M Cyclotron Institute).

doi: 10.1103/PhysRevC.105.045805
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2746. Data from this article have been entered in the XUNDL database. For more information, click here.


2022RE03      Phys.Rev. C 105, 034612 (2022)

C.S.Reingold, A.Simon, R.O.Hughes, J.T.Harke, K.A.Chipps, S.Burcher, D.T.Blankstien, J.A.Cizewski, N.Cooper, M.Hall, S.Ota, B.Schroeder, S.Upadhyayula

Spin inhibition in ψ-decay probabilities for states above Sn in Sm and Dy nuclei

NUCLEAR REACTIONS 148Sm(p, d), 148Sm, 162Dy(p, t), E=29.55 MeV; measured charged particles, Eγ, Iγ, deuteron and triton spectra, (particle)γ-coin. 146,147Sm, 160Dy; deduced γ-decay probabilities. Investigated the eefect of spin-inhibition for high-spin states above neutron separation threshold. Hyperion setup comprised of Compton-suppressed clover detectors for γ-ray measurements and a ΔE-E telescope for particle energy measurements and identification. Beam from K150 cyclotron at Texas A

doi: 10.1103/PhysRevC.105.034612
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2022SC17      J.Phys.(London) G49, 110502 (2022)

H.Schatz, A.D.Becerril Reyes, A.Best, E.F.Brown, K.Chatziioannou, K.A.Chipps, C.M.Deibel, R.Ezzeddine, D.K.Galloway, C.J.Hansen, F.Herwig, A.P.Ji, M.Lugaro, Z.Meisel, D.Norman, J.S.Read, L.F.Roberts, A.Spyrou, I.Tews, F.X.Timmes, C.Travaglio, N.Vassh, C.Abia, P.Adsley, S.Agarwal, M.Aliotta, W.Aoki, A.Arcones, A.Aryan, A.Bandyopadhyay, A.Banu, D.W.Bardayan, J.Barnes, A.Bauswein, T.C.Beers, J.Bishop, T.Boztepe, B.Cote, M.E.Caplan, A.E.Champagne, J.A.Clark, M.Couder, A.Couture, S.E.de Mink, S.Debnath, R.J.deBoer, J.den Hartogh, P.Denissenkov, V.Dexheimer, I.Dillmann, J.E.Escher, M.A.Famiano, R.Farmer, R.Fisher, C.Frohlich, A.Frebel, C.Fryer, G.Fuller, A.K.Ganguly, S.Ghosh, B.K.Gibson, T.Gorda, K.N.Gourgouliatos, V.Graber, M.Gupta, W.C.Haxton, A.Heger, W.R.Hix, W.C.G.Ho, E.M.Holmbeck, A.A.Hood, S.Huth, G.Imbriani, R.G.Izzard, R.Jain, H.Jayatissa, Z.Johnston, T.Kajino, A.Kankainen, G.G.Kiss, A.Kwiatkowski, M.La Cognata, A.M.Laird, L.Lamia, P.Landry, E.Laplace, K.D.Launey, D.Leahy, G.Leckenby, A.Lennarz, B.Longfellow, A.E.Lovell, W.G.Lynch, S.M.Lyons, K.Maeda, E.Masha, C.Matei, J.Merc, B.Messer, F.Montes, A.Mukherjee, M.R.Mumpower, D.Neto, B.Nevins, W.G.Newton, L.Q.Nguyen, K.Nishikawa, N.Nishimura, F.M.Nunes, E.O'Connor, B.W.O'Shea, W.-J.Ong, S.D.Pain, M.A.Pajkos, M.Pignatari, R.G.Pizzone, V.M.Placco, T.Plewa, B.Pritychenko, A.Psaltis, D.Puentes, Y.-Z.Qian, D.Radice, D.Rapagnani, B.M.Rebeiro, R.Reifarth, A.L.Richard, N.Rijal, I.U.Roederer, J.S.Rojo, J.S K, Y.Saito, A.Schwenk, M.L.Sergi, R.S.Sidhu, A.Simon, T.Sivarani, A.Skuladottir, M.S.Smith, A.Spiridon, T.M.Sprouse, S.Starrfield, A.W.Steiner, F.Strieder, I.Sultana, R.Surman, T.Szucs, A.Tawfik, F.Thielemann, L.Trache, R.Trappitsch, M.B.Tsang, A.Tumino, S.Upadhyayula, J.O.Valle Martinez, M.Van der Swaelmen, C.Viscasillas Vazquez, A.Watts, B.Wehmeyer, M.Wiescher, C.Wrede, J.Yoon, R.G.T.Zegers, M.A.Zermane, M.Zingale, the Horizon 2020 Collaborations

Horizons: nuclear astrophysics in the 2020s and beyond

doi: https://dx.doi.org/10.1088/1361-6471/ac8890
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2021BI06      Phys.Rev. C 103, L051303 (2021)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, A.Bosh, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, M.Munch, E.C.Pollacco, C.D.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Evidence against the Efimov effect in 12C from spectroscopy and astrophysics

RADIOACTIVITY 12N(β+); 12B(β-); measured β-delayed charged particles, Eα, Iα from the decay of 40-MeV 12N beam stopped inside the active-area of the TexAT (Texas Active target) TPC (Time Projection Chamber), Eγ, Iγ, γγ-coin from the decay of 12B using Gammasphere array at ANL. 12C; deduced no evidence for an hypothetical state predicted by Efimov effect at 7.458 MeV from a combined analysis of the two experiments involving charged-particle spectroscopy at Texas A and M, and γ-ray measurements at ANL, along with astrophysical rate calculations. Relevance to rate required for stars to undergo the red giant phase.

doi: 10.1103/PhysRevC.103.L051303
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2021LI22      Phys.Rev. C 103, 044613 (2021)

R.Linares, M.Sinha, E.N.Cardozo, V.Guimaraes, G.V.Rogachev, J.Hooker, E.Koshchiy, T.Ahn, C.Hunt, H.Jayatissa, S.Upadhyayula, B.Roeder, A.Saastomoinen, J.Lubian, M.Rodriguez-Gallardo, J.Casal, K.C.C.Pires, M.Assuncao, Y.Penionzhkevich, S.Lukyanov

Elastic scattering measurements for the 10C+ 208Pb system at Elab = 66 MeV

NUCLEAR REACTIONS 208Pb(10C, 10C), E=66 MeV, [10C secondary beam from 1H(10B, 10C), E=9.6 MeV/nucleon primary reaction, followed by selection of 10C beam by the Momentum Achromatic Recoil Spectrometer (MARS) at the K500 superconducting Cyclotron Institute of Texas A and M University]; measured elastically scattered 10C ions, angular distribution of scattered 10C, total σ using ΔE-E telescope of double-sided silicon strip detectors (DSSSDs); deduced suppression of the Fresnel peak. Comparison with optical model, coupled channels, and 3-body and 4-body continuum-discretized coupled-channels (CDCC) calculations using 9B+p, 6Be+α, and 8Be+p+p cluster configurations of 10C with a Brunnian (super-Borromean) structure; analyzed reaction cross sections in literature for the several projectiles on 208Pb target.

doi: 10.1103/PhysRevC.103.044613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2627.


2021OT02      Phys.Rev. C 104, 055806 (2021)

S.Ota, G.Christian, W.N.Catford, G.Lotay, M.Pignatari, U.Battino, E.A.Bennett, S.Dede, D.T.Doherty, S.Hallam, F.Herwig, J.Hooker, C.Hunt, H.Jayatissa, A.Matta, M.Moukaddam, E.Rao, G.V.Rogachev, A.Saastamoinen, D.Scriven, J.A.Tostevin, S.Upadhyayula, R.Wilkinson

(6Li, d) and (6Li, t) reactions on 22Ne and implications for s-process nucleosynthesis

NUCLEAR REACTIONS 6Li(22Ne, d)26Mg, 6Li(22Na, t)25Mg, E=154 MeV; 2H(22Ne, p)23Ne, E not given; measured reaction products, E(d), I(d), E(p), I(p), Eγ, Iγ, 26Mg and 25Mg recoils, (26Mg)γ-coin, (25Mg)γ-coin, (particle)(particle)-coin, σ(θ) using TIARA Si detector array of two sets of Si detectors, 'Hyball' and 'Barrel', MDM high-resolution and broad range magnetic spectrometer, and array of four HPGe detectors at the K150 cyclotron of Texas A and M University. 23Ne, 25Mg, 26Mg; deduced levels, J, π, resonances, resonances in the Gamow window of 22Ne(α, n)25Mg reaction, spectroscopic factors, α-spectroscopic factors for 26Mg, resonance strengths, impact of 22Ne+α resonances on s-process nucleosynthesis; comparison of σ(θ) data with DWBA calculations using FRESCO code. Comparison with previous experimental results. 22Ne(α, n), (α, γ); calculated s-process overproduction factors in stars 3 and 5 times the mass of the sun for A=60-210 isotopes.

doi: 10.1103/PhysRevC.104.055806
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Data from this article have been entered in the XUNDL database. For more information, click here.


2021RA22      Phys.Rev. C 104, L042801 (2021)

J.S.Randhawa, R.Kanungo, J.Refsgaard, P.Mohr, T.Ahn, M.Alcorta, C.Andreoiu, S.S.Bhattacharjee, B.Davids, G.Christian, A.A.Chen, R.Coleman, P.E.Garrett, G.F.Grinyer, E.G.Fuakye, G.Hackman, J.Hollett, R.Jain, K.Kapoor, R.Krucken, A.Laffoley, A.Lennarz, J.Liang, Z.Meisel, B.Nikhil, A.Psaltis, A.Radich, M.Rocchini, N.Saei, M.Saxena, M.Singh, C.Svensson, P.Subramaniam, A.Talebitaher, S.Upadhyayula, C.Waterfield, J.Williams, M.Williams

First direct measurement of 59Cu(p, α)56Ni: step towards constraining the Ni-Cu cycle in the cosmos

NUCLEAR REACTIONS 1H(59Cu, α)56Ni, E=8.5 MeV/nucleon, [secondary 59Cu beam from Nb(p, X), E=480 MeV at the TRIUMF cyclotron, followed by re-acceleration of 59Cu beam by ISAC-II superconducting LINAC, solid H2 target]; measured protons and α particles, angle-integrated σ using thick single-sided silicon strip detectors and a layer of thick CsI(Tl) detectors; deduced ratio of integrated σ to total σ, exclusive population of the ground state of 56Ni in (p, α). Comparison with Hauser-Feshbach based statistical model calculations; deduced overestimation of (p, α) cross section in this region. Discussed impact on νp process and x-ray bursts (XRBs). Relevance to Ni-Cu cycle in nucleosynthesis, with competing 59Cu(p, α)56Ni and 59Cu(p, γ)60Zn reactions.

doi: 10.1103/PhysRevC.104.L042801
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2696.


2021ZA03      Phys.Lett. B 816, 136256 (2021)

J.C.Zamora, V.Guimaraes, G.V.Rogachev, S.Ahn, J.Lubian, E.N.Cardozo, E.Aboud, M.Assuncao, M.Barbui, J.Bishop, A.Bosh, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, S.Lukyanov, R.O'Dwyer, Y.Penionzhkevich, B.T.Roeder, A.Saastamoinen, S.Upadhyayula

Direct fusion measurement of the 8B proton-halo nucleus at near-barrier energies

NUCLEAR REACTIONS 40Ar(8B, X), E=5.1 MeV/nucleon; measured reaction products; deduced fusion σ, barrier parameters. Universal Fusion Function (UFF) parameterization, comparison with available data.

doi: 10.1016/j.physletb.2021.136256
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2633.


2020BI11      Phys.Rev. C 102, 041303 (2020)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, A.Bosh, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, E.C.Pollacco, C.D.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Almost medium-free measurement of the Hoyle state direct-decay component with a TPC

RADIOACTIVITY 12N(β+), (β+α)[from 3He(10B, 12N), E=11 MeV/nucleon at K500 cyclotron at the Cyclotron Institute at Texas A and M University, followed by isotopic separation using Momentum Achromatic Recoil Spectrometer]; measured β-delayed charged-particles using Texas active target time-projection chamber (TPC). 12C; deduced upper limit for the nonsequential component of the decay of the excited 0+, Hoyle state in an almost medium-free reaction. Comparison with previous experimental results, and with predictions from Faddeev calculations.

doi: 10.1103/PhysRevC.102.041303
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Data from this article have been entered in the XUNDL database. For more information, click here.


2020BI15      Nucl.Instrum.Methods Phys.Res. A964, 163773 (2020)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, P.Baron, A.Bosh, E.Delagnes, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, R.O'Dwyer, E.C.Pollacco, C.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Beta-delayed charged-particle spectroscopy using TexAT

RADIOACTIVITY 12N(IT), (EC), 12C(3α), 8Be(2α) [from 3He(10B, n)12N, E=11 MeV/nucleon]; measured decay products, Eα, Iα; deduced branching ratio of 12N to states in 12C above the 3-α threshold, the total branching ratio to the Hoyle state, 12N T1/2 using the β-delayed charged-particle-decay. Comparison with available data.

doi: 10.1016/j.nima.2020.163773
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2020JA02      Phys.Lett. B 802, 135267 (2020)

H.Jayatissa, G.V.Rogachev, V.Z.Goldberg, E.Koshchiy, G.Christian, J.Hooker, S.Ota, B.T.Roeder, A.Saastamoinen, O.Trippella, S.Upadhyayula, E.Uberseder

Constraining the 22Ne(α, γ))26Mg and 22Ne(α, n)25Mg reaction rates using sub-Coulomb α-transfer reactions

NUCLEAR REACTIONS 6Li(22Ne, d), E(cm)=4.6 MeV; 6Li(22Ne, t), E(cm)=5.3 MeV; measured reaction products; deduced excitation energies, σ, resonance parameters, astrophysical rates.

doi: 10.1016/j.physletb.2020.135267
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2517.


2020OT01      Phys.Lett. B 802, 135256 (2020)

S.Ota, G.Christian, G.Lotay, W.N.Catford, E.A.Bennett, S.Dede, D.T.Doherty, S.Hallam, J.Hooker, C.Hunt, H.Jayatissa, A.Matta, M.Moukaddam, G.V.Rogachev, A.Saastamoinen, J.A.Tostevin, S.Upadhyayula, R.Wilkinson

Decay properties of 22Ne + α resonances and their impact on s-process nucleosynthesis

NUCLEAR REACTIONS 6Li(22Ne, d)26Mg, E=154 MeV; measured reaction products; deduced resonance parameters, n/γ branching ratio. Comparison with Monte Carlo calculations.

doi: 10.1016/j.physletb.2020.135256
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2573.


2020UP01      Phys.Rev. C 101, 034604 (2020)

S.Upadhyayula, G.V.Rogachev, J.Bishop, V.Z.Goldberg, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, E.Uberseder, A.Volya, B.T.Roeder, A.Saastamoinen

Search for the high-spin members of the α:2n:α band in 10Be

NUCLEAR REACTIONS 4He(6He, 6He), (6He, 6He'), E(cm)=4-9 MeV [secondary 6He beam from 2H(7Li, 6He), E=60 MeV]; measured reaction products, Eα, Iα, σ(E, θ), using silicon detector for α detection and the MARS spectrometer for secondary beam identification at the cyclotron facility of Texas A and M University. 10Be; deduced resonance parameters and upper limit of Γ(α)/Γ(α') for an yrast 6+ state at 13.5 MeV as the next member of the molecular α:2n:α rotational band in 10Be; no evidence found for a strong resonance at 13.5 MeV in the elastic and inelastic channels. GEANT4 Monte Carlo simulations. Comparison with theoretical predictions, and with previous experimental studies.

doi: 10.1103/PhysRevC.101.034604
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019HO14      Phys.Rev. C 100, 054618 (2019)

J.Hooker, G.V.Rogachev, E.Koshchiy, S.Ahn, M.Barbui, V.Z.Goldberg, C.Hunt, H.Jayatissa, E.C.Pollacco, B.T.Roeder, A.Saastamoinen, S.Upadhyayula

Structure of 9C through proton resonance scattering with the Texas Active Target detector

NUCLEAR REACTIONS 1H(8B, p)9C*, E=60.8 MeV, [secondary 8B beam from 6Li(3He, n)8B, E=13.2 MeV/nucleon primary reaction, and using the Momentum Achromat Recoil Spectrometer (MARS) at the Cyclotron Institute of Texas A and M University]; measured charged products, 8B spectrum, Ep, (8Be)p-coin, angular distributions using TexAT time projection chamber (TPC) and CsI(Tl) scintillators. 9C; deduced levels, resonances, J, π, phase shifts, widths using R-matrix analysis. Comparison with previous experimental data, and with ab initio calculations in literature.

doi: 10.1103/PhysRevC.100.054618
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2423. Data from this article have been entered in the XUNDL database. For more information, click here.


2017HO10      Phys.Lett. B 769, 62 (2017)

J.Hooker, G.V.Rogachev, V.Z.Goldberg, E.Koshchiy, B.T.Roeder, H.Jayatissa, C.Hunt, C.Magana, S.Upadhyayula, E.Uberseder, A.Saastamoinen

Structure of 10N in 9C+p resonance scattering

NUCLEAR REACTIONS 1H(9C, X)10N, E=23.4 MeV/nucleon; measured reaction products, Ep, Ip; deduced σ, J, π, resonance parameters.

doi: 10.1016/j.physletb.2017.03.025
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2265. Data from this article have been entered in the XUNDL database. For more information, click here.


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