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NSR database version of April 11, 2024.

Search: Author = R.Surman

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2024VA02      Phys.Rev.Lett. 132, 052701 (2024)

N.Vassh, X.Wang, M.Lariviere, T.Sprouse, M.R.Mumpower, R.Surman, Zh.Liu, G.C.McLaughlin, P.Denissenkov, F.Herwig

Thallium-208: A Beacon of In Situ Neutron Capture Nucleosynthesis

doi: 10.1103/PhysRevLett.132.052701
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2023LU01      Astrophys.J. 944, 144 (2023)

K.A.Lund, J.Engel, G.C.McLaughlin, M.R.Mumpower, E.M.Ney, R.Surman

The Influence of β-decay Rates on r-process Observables

doi: 10.3847/1538-4357/acaf56
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2022KI23      Astrophys.J. 936, 107 (2022)

G.G.Kiss, A.Vitez-Sveiczer, Y.Saito, A.Tarifeno-Saldivia, M.Pallas, J.L.Tain, I.Dillmann, J.Agramunt, A.Algora, C.Domingo-Pardo, A.Estrade, C.Appleton, J.M.Allmond, P.Aguilera, H.Baba, N.T.Brewer, C.Bruno, R.Caballero-Folch, F.Calvino, P.J.Coleman-Smith, G.Cortes, T.Davinson, N.Fukuda, Z.Ge, S.Go, C.J.Griffin, R.K.Grzywacz, O.Hall, A.Horvath, J.Ha, L.J.Harkness-Brennan, T.Isobe, D.Kahl, T.T.King, A.Korgul, S.Kovacs, R.Krucken, S.Kubono, M.Labiche, J.Liu, J.Liang, M.Madurga, K.Miernik, F.Molina, A.I.Morales, M.R.Mumpower, E.Nacher, A.Navarro, N.Nepal, S.Nishimura, M.Piersa-Silkowska, V.Phong, B.C.Rasco, B.Rubio, K.P.Rykaczewski, J.Romero-Barrientos, H.Sakurai, L.Sexton, Y.Shimizu, M.Singh, T.Sprouse, T.Sumikama, R.Surman, H.Suzuki, T.N.Szegedi, H.Takeda, A.Tolosa, K.Wang, M.Wolinska-Cichocka, P.Woods, R.Yokoyama, Z.Xu

Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

NUCLEAR REACTIONS 9Be(238U, X), E=345 MeV/nucleon; measured reaction products, TOF, Eβ, Iβ. 159,160,161,162,163,164,165,166Pm, 161,162,163,164,165,166,167,168Sm, 165,166,167,168,169,170Eu, 167,168,169,170,171,172Gd; deduced new isotopes T1/2 and β-delayed neutron emission probabilities, relative r-process abundance pattern for the neutron-star merger scenario. RIKEN Nishina Center, the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array.

doi: 10.3847/1538-4357/ac80fc
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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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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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2021HO13      Astrophys.J. 909, 21 (2021)

E.M.Holmbeck, A.Frebel, G.C.McLaughlin, R.Surman, R.Fernandez, B.D.Metzger, M.R.Mumpower, T.M.Sprouse

Reconstructing Masses of Merging Neutron Stars from Stellar r-process Abundance Signatures

doi: 10.3847/1538-4357/abd720
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2021SP05      Phys.Rev. C 104, 015803 (2021)

T.M.Sprouse, M.R.Mumpower, R.Surman

Following nuclei through nucleosynthesis: A novel tracing technique

NUCLEAR STRUCTURE A=80-240; calculated relative contributions to final isotopic abundances by terminating all the fission channels for different conditions of neutron star merger, relative contributions to final isotopic abundances for the β-delayed and neutron-induced fission products of neptunium and plutonium isotopes, comparison of fission yield to final traced abundances for the neutron-induced fission of 290Np and β-delayed fission of 270Bk. N=158-205; calculated integrated β-delayed and neutron-induced fission flows for individual nuclides during the cold tidal-tail ejecta conditions of neutron star merger. A=126-210; calculated isotopic abundances based on tracing β- decay of 152,176,186Nd. Z=40-80, N=50-134; calculated traced abundances of individual β-decays for Z=40-80 isotopes. Nucleosynthesis tracing framework for the r process, starting with system of coupled differential equations, and by quantifying relative fraction of nuclear abundances that pass through individual nuclear reaction, decay, and fission processes during nucleosynthesis.

doi: 10.1103/PhysRevC.104.015803
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2021ZH02      Astrophys.J. 906, 94 (2021)

Y.L.Zhu, K.A.Lund, J.Barnes, T.M.Sprouse, N.Vassh, G.C.McLaughlin, M.R.Mumpower, R.Surman

Modeling Kilonova Light Curves: Dependence on Nuclear Inputs

RADIOACTIVITY 254Cf, 254Cm, 258,259Fm, 267,269,270,271Rf, 273Db, 288Hs(SF); calculated total spontaneous fission heating, electron fractions using HFB22, HFB27, FRDM2012, UNEDF1 and ETFSI models.

doi: 10.3847/1538-4357/abc69e
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2020SP04      Phys.Rev. C 101, 055803 (2020)

T.M.Sprouse, R.Navarro-Perez, R.Surman, M.R.Mumpower, G.C.McLaughlin, N.Schunck

Propagation of statistical uncertainties of Skyrme mass models to simulations of r-process nucleosynthesis

ATOMIC MASSES Z=1-120; calculated atomic mass tables within the nuclear density functional theory (DFT) approach to nuclear structure with Skyrme energy density functionals (EDFs), and UNEDF1 parametrization. A=120-200; analyzed propagation of uncertainties in the Skyrme mass models using Bayesian statistics for the simulated r-process abundance patterns, by considering nuclear masses and the influence of the masses on β-decay and neutron capture rates.

doi: 10.1103/PhysRevC.101.055803
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2020VI04      Phys.Rev. C 101, 034312 (2020)

M.Vilen, J.M.Kelly, A.Kankainen, M.Brodeur, A.Aprahamian, L.Canete, R.P.de Groote, A.de Roubin, T.Eronen, A.Jokinen, I.D.Moore, M.R.Mumpower, D.A.Nesterenko, J.O'Brien, A.Pardo Perdomo, H.Penttila, M.Reponen, S.Rinta-Antila, R.Surman

Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRAP

ATOMIC MASSES 154Nd, 161Pm, 163Sm, 162,162m,163,164,165Eu, 163,163m,167Gd, 165,166,167,168Tb; measured time-of-flight ion-cyclotron-resonances (TOF-ICR) and phase-imaging ion-cyclotron-resonances (PI-ICR), frequency ratios, mass excesses using the JYFLTRAP double penning trap at the IGISOL facility of University of Jyvaskyla; deduced S(n), S(2n), pairing-gap energies, and average proton neutron interaction of valence nucleons. 162mEu, 163mGd; deduced absolute energies of the isomers. Comparison with previous experimental measurements, and with evaluated data in AME2016. Isotopes formed in U(p, F), E=25 MeV reaction. Discussed impact on solar r-process abundances as a function of the mass number.

doi: 10.1103/PhysRevC.101.034312
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Data from this article have been entered in the XUNDL database. For more information, click here.

2019HO18      J.Phys.(London) G46, 083001 (2019)

C.J.Horowitz, A.Arcones, B.Cote, I.Dillmann, W.Nazarewicz, I.U.Roederer, H.Schatz, A.Aprahamian, D.Atanasov, A.Bauswein, T.C.Beers, J.Bliss, M.Brodeur, J.A.Clark, A.Frebel, F.Foucart, C.J.Hansen, O.Just, A.Kankainen, G.C.McLaughlin, J.M.Kelly, S.N.Liddick, D.M.Lee, J.Lippuner, D.Martin, J.Mendoza-Temis, B.D.Metzger, M.R.Mumpower, G.Perdikakis, J.Pereira, B.W.O'Shea, R.Reifarth, A.M.Rogers, D.M.Siegel, A.Spyrou, R.Surman, X.Tang, T.Uesaka, M.Wang

r-process nucleosynthesis: connecting rare-isotope beam facilities with the cosmos

doi: 10.1088/1361-6471/ab0849
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2019YO03      Phys.Rev. C 100, 031302(R) (2019)

R.Yokoyama, R.Grzywacz, B.C.Rasco, N.Brewer, K.P.Rykaczewski, I.Dillmann, J.L.Tain, S.Nishimura, D.S.Ahn, A.Algora, J.M.Allmond, J.Agramunt, H.Baba, S.Bae, C.G.Bruno, R.Caballero-Folch, F.Calvino, P.J.Coleman-Smith, G.Cortes, T.Davinson, C.Domingo-Pardo, A.Estrade, N.Fukuda, S.Go, C.J.Griffin, J.Ha, O.Hall, L.J.Harkness-Brennan, J.Heideman, T.Isobe, D.Kahl, M.Karny, T.Kawano, L.H.Khiem, T.T.King, G.G.Kiss, A.Korgul, S.Kubono, M.Labiche, I.Lazarus, J.Liang, J.Liu, G.Lorusso, M.Madurga, K.Matsui, K.Miernik, F.Montes, A.I.Morales, P.Morrall, N.Nepal, R.D.Page, V.H.Phong, M.Piersa, M.Prydderch, V.F.E.Pucknell, M.M.Rajabali, B.Rubio, Y.Saito, H.Sakurai, Y.Shimizu, J.Simpson, M.Singh, D.W.Stracener, T.Sumikama, R.Surman, H.Suzuki, H.Takeda, A.Tarifeno-Saldivia, S.L.Thomas, A.Tolosa-Delgado, M.Wolinska-Cichocka, P.J.Woods, X.X.Xu

Strong one-neutron emission from two-neutron unbound states in β decays of the r-process nuclei 86, 87Ga

RADIOACTIVITY 84,85,86,87Ga(β-), (β-n), (β-2n)[from 9Be(238U, F), E=345 MeV/nucleon, followed by separation and identification of fragments using the BigRIPS in-flight separator at RIBF-RIKEN facility]; measured secondary ions implanted into active stoppers made of double-sided silicon-strip detectors (DSSSDs), neutrons by BRIKEN array of 3He counters, WAS3ABi for β and ion detection, and γ rays by two clover-type HPGe detectors, (ions)βn-coin, half-lives of decays of 84,85,86,87Ga; deduced decay curves, %β-n (P1n) and %β-2n (P2n). Comparison with shell-model and QRPA calculations. Relevance to r-process modeling.

doi: 10.1103/PhysRevC.100.031302
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Data from this article have been entered in the XUNDL database. For more information, click here.

2018MU17      Astrophys.J. 869, 14 (2018)

M.R.Mumpower, T.Kawano, T.M.Sprouse, N.Vassh, E.M.Holmbeck, R.Surman, P.Moller

β-delayed Fission in r-process Nucleosynthesis

doi: 10.3847/1538-4357/aaeaca
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2018OR02      Phys.Rev.Lett. 120, 262702 (2018)

R.Orford, N.Vassh, J.A.Clark, G.C.McLaughlin, M.R.Mumpower, G.Savard, R.Surman, A.Aprahamian, F.Buchinger, M.T.Burkey, D.A.Gorelov, T.Y.Hirsh, J.W.Klimes, G.E.Morgan, A.Nystrom, K.S.Sharma

Precision Mass Measurements of Neutron-Rich Neodymium and Samarium Isotopes and Their Role in Understanding Rare-Earth Peak Formation

ATOMIC MASSES 154,156,158,159,160Nd, 162,163,164Sm; measured cyclotron frequency ratios; deduced mass excess values. Comparison with AME16 evaluation.

doi: 10.1103/PhysRevLett.120.262702
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2018TA20      Acta Phys.Pol. B49, 417 (2018)

J.L.Tain, J.Agramunt, D.S.Ahn, A.Algora, J.M.Allmond, H.Baba, S.Bae, N.T.Brewer, R.Caballero-Folch, F.Calvino, P.J.Coleman-Smith, G.Cortes, T.Davinson, I.Dillmann, C.Domingo-Pardo, A.Estrade, N.Fukuda, S.Go, C.Griffin, R.Grzywacz, J.Ha, O.Hall, L.Harkness-Brennan, T.Isobe, D.Kahl, M.Karny, G.G.Kiss, M.Kogimtzis, A.Korgul, S.Kubono, M.Labiche, I.Lazarus, J.Lee, J.Liu, G.Lorusso, K.Matsui, K.Miernik, F.Montes, B.Moon, A.I.Morales, N.Nepal, S.Nishimura, R.D.Page, Z.Podolyak, V.F.E.Pucknell, B.C.Rasco, P.H.Regan, A.Riego, B.Rubio, K.P.Rykaczewski, Y.Saito, H.Sakurai, Y.Shimizu, J.Simpson, P.A.Soderstrom, D.W.Stracener, T.Sumikama, R.Surman, H.Suzuki, M.Takechi, H.Takeda, A.Tarifeno-Saldivia, S.L.Thomas, A.Tolosa-Delgado, V.H.Phong, P.Woods

The BRIKEN Project: Extensive Measurements of β-delayed Neutron Emitters for the Astrophysical r Process

doi: 10.5506/aphyspolb.49.417
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2018VI02      Phys.Rev.Lett. 120, 262701 (2018)

M.Vilen, J.M.Kelly, A.Kankainen, M.Brodeur, A.Aprahamian, L.Canete, T.Eronen, A.Jokinen, T.Kuta, I.D.Moore, M.R.Mumpower, D.A.Nesterenko, H.Penttila, I.Pohjalainen, W.S.Porter, S.Rinta-Antila, R.Surman, A.Voss, J.Aysto

Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP: Reduced Neutron Pairing and Implications for r-Process Calculations

ATOMIC MASSES 156,158Nd, 158,160Pm, 162Sm, 162,163Eu, 163,164,165,166Gd, 164Tb; measured time-of-flight spectra, frequency ratios; deduced mass-excess values. Comparison with AME16 evaluation.

doi: 10.1103/PhysRevLett.120.262701
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2018ZH34      Astrophys.J. 863, L23 (2018)

Y.Zhu, R.T.Wollaeger, N.Vassh, R.Surman, T.M.Sprouse, M.R.Mumpower, P.Moller, G.C.McLaughlin, O.Korobkin, T.Kawano, P.J.Jaffke, E.M.Holmbeck, C.L.Fryer, W.P.Even, A.J.Couture, J.Barnes

Californium-254 and Kilonova Light Curves

RADIOACTIVITY 254Cf(SF); calculated abundance, fission product yields, heating rates, mid-IR light curves.

doi: 10.3847/2041-8213/aad5de
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2017MU08      J.Phys.(London) G44, 034003 (2017)

M.R.Mumpower, G.C.McLaughlin, R.Surman, A.W.Steiner

Reverse engineering nuclear properties from rare earth abundances in the r process

COMPILATION A<250; compiled experimental nuclear reaction and structure data.

doi: 10.1088/1361-6471/44/3/034003
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2017SP03      J.Phys.(London) G44, 044002 (2017)

A.Spyrou, A.C.Larsen, S.N.Liddick, F.Naqvi, B.P.Crider, A.C.Dombos, M.Guttormsen, D.L.Bleuel, A.Couture, L.Crespo Campo, R.Lewis, S.Mosby, M.R.Mumpower, G.Perdikakis, C.J.Prokop, S.J.Quinn, T.Renstrom, S.Siem, R.Surman

Neutron-capture rates for explosive nucleosynthesis: the case of 68Ni(n, γ)69Ni

RADIOACTIVITY 69Co(β-); measured decay products, Eγ, Iγ; deduced the γ-ray strength function and the nuclear level density, T1/2. Comparison with available data.

doi: 10.1088/1361-6471/aa5ae7
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14476. Data from this article have been entered in the XUNDL database. For more information, click here.

2016AL10      Phys.Rev. C 93, 044325 (2016)

M.F.Alshudifat, R.Grzywacz, M.Madurga, C.J.Gross, K.P.Rykaczewski, J.C.Batchelder, C.Bingham, I.N.Borzov, N.T.Brewer, L.Cartegni, A.Fijalkowska, J.H.Hamilton, J.K.Hwang, S.V.Ilyushkin, C.Jost, M.Karny, A.Korgul, W.Krolas, S.H.Liu, C.Mazzocchi, A.J.Mendez, K.Miernik, D.Miller, S.W.Padgett, S.V.Paulauskas, A.V.Ramayya, D.W.Stracener, R.Surman, J.A.Winger, M.Wolinska-Cichocka, E.F.Zganjar

Reexamining Gamow-Teller decays near 78Ni

RADIOACTIVITY 82,83Zn, 82,83Ga(β-), (β-n)[from 238U(p, F), E=50 MeV]; measured Eγ, Iγ, Eβ, βγ-, γγ-coin, half-lives of decay of 82,83Zn, 83Ga, β-delayed neutron branching ratio Pn for 82Zn decay at HRIBF-ORNL facility. 81,82,83Ga, 81,82Ge; deduced levels, J, π, beta feedings, logft. Comparison of level spectra with shell-model calculations, and with previous experimental results. 82,83Zn, 82,83Ga(β-); calculated B(GT) strengths using shell-model with NUSHELLX computer code.

doi: 10.1103/PhysRevC.93.044325
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Data from this article have been entered in the XUNDL database. For more information, click here.

2016LI30      Phys.Rev.Lett. 116, 242502 (2016)

S.N.Liddick, A.Spyrou, B.P.Crider, F.Naqvi, A.C.Larsen, M.Guttormsen, M.Mumpower, R.Surman, G.Perdikakis, D.L.Bleuel, A.Couture, L.C.Campo, A.C.Dombos, R.Lewis, S.Mosby, S.Nikas, C.J.Prokop, T.Renstrom, B.Rubio, S.Siem, S.J.Quinn

Experimental Neutron Capture Rate Constraint Far from Stability

RADIOACTIVITY 70Co(β-) [from 9Be(86Kr, X), E=140 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced nuclear level density as a function of excitation energy. Comparison with available data.

NUCLEAR REACTIONS 69Ni(n, γ), E<10 GK; calculated nuclear reaction capture rates using experimental level densities and code TALYS.

doi: 10.1103/PhysRevLett.116.242502
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2016MU01      Prog.Part.Nucl.Phys. 86, 86 (2016); Erratum Prog.Part.Nucl.Phys. 87, 116 (2016)

M.R.Mumpower, R.Surman, G.C.McLaughlin, A.Aprahamian

The impact of individual nuclear properties on r-process nucleosynthesis

doi: 10.1016/j.ppnp.2015.09.001
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2016SH39      Phys.Rev. C 94, 055802 (2016)

T.Shafer, J.Engel, C.Frohlich, G.C.McLaughlin, M.Mumpower, R.Surman

β decay of deformed r-process nuclei near A=80 and A=160, including odd-A and odd-odd nuclei, with the Skyrme finite-amplitude method

RADIOACTIVITY 68,69,70,71,72Cr, 71,72,73,74,75Mn, 72,73,74,75,76Fe, 76,77Co, 80,81Cu, 84,85,86Zn, 86,87Ga, 86,87,88,89,90,91,92Ge, 89,90,91,92,93,94,95As, 92,93,94,95,96,97,98Se, 157,159,161,163,165,167Cs, 163,165,167,169,171,173,175La, 146,148,150,152,160,164,166,168,170,172,174,176Ce, 152,154,156,164,166,172,174,176,178Nd(β-); calculated half-lives using proton-neutron finite-amplitude method (pn-FAM) with Skyrme energy-density functionals (EDFs) in the quasiparticle random-phase approximation (QRPA), after optimizing the nuclear interaction to best fit the measured half-lives in A=80 and A=160 regions. Deduced r-process abundances. Comparison with other theoretical calculations and experimental values.

doi: 10.1103/PhysRevC.94.055802
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2016SU08      Acta Phys.Pol. B47, 673 (2016)

R.Surman, M.Mumpower, A.Aprahamian

Uncorrelated Nuclear Mass Uncertainties and r-process Abundance Predictions

NUCLEAR STRUCTURE A=50-220; calculated isotopic yields and abundances of elements produced during the r-process.

doi: 10.5506/APhysPolB.47.673
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2015MU04      J.Phys.(London) G42, 034027 (2015)

M.Mumpower, R.Surman, D.L.Fang, M.Beard, A.Aprahamian

The impact of uncertain nuclear masses near closed shells on the r-process abundance pattern

doi: 10.1088/0954-3899/42/3/034027
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2015MU12      Phys.Rev. C 92, 035807 (2015)

M.R.Mumpower, R.Surman, D.-L.Fang, M.Beard, P.Moller, T.Kawano, A.Aprahamian

Impact of individual nuclear masses on r-process abundances

NUCLEAR STRUCTURE Z=30-75, N=60-130, A=120-210; calculated relevant Q values, neutron capture rates, photodissociation rates, β-decay rates, and β-delayed neutron emission probabilities using the 2012 version of the Finite-Range Droplet Model (FRDM), and by considering variations of individual nuclear masses; deduced influence of uncertainties in individual masses on the r-process abundance distribution.

doi: 10.1103/PhysRevC.92.035807
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2013MA87      Phys.Rev. C 88, 064320 (2013)

C.Mazzocchi, R.Surman, R.Grzywacz, J.C.Batchelder, C.R.Bingham, D.Fong, J.H.Hamilton, J.K.Hwang, M.Karny, W.Krolas, S.N.Liddick, P.F.Mantica, A.C.Morton, W.F.Mueller, K.P.Rykaczewski, M.Steiner, A.Stolz, J.A.Winger, I.N.Borzov

New half-lives of very neutron-rich iron isotopes

NUCLEAR REACTIONS 9Be(86Kr, X)69Fe/70Fe/71Fe/72Fe, E=140 MeV/nucleon; measured reaction products and half-lives using A1900 separator at NSCL-MSU cyclotron facility.

RADIOACTIVITY 69,70,71,72Fe(β-)[from 9Be(86Kr, X), E=140 MeV/nucleon]; measured Eβ, Eγ, βγ-coin, half-lives. Comparison with theoretical calculations using FRDM+QRPA, DF3a+CQRPA, and gross theory (GT2+HF-09).

doi: 10.1103/PhysRevC.88.064320
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2013MI13      Phys.Rev. C 88, 014309 (2013)

K.Miernik, K.P.Rykaczewski, R.Grzywacz, C.J.Gross, D.W.Stracener, J.C.Batchelder, N.T.Brewer, L.Cartegni, A.Fijalkowska, J.H.Hamilton, J.K.Hwang, S.V.Ilyushkin, C.Jost, M.Karny, A.Korgul, W.Krolas, S.H.Liu, M.Madurga, C.Mazzocchi, A.J.Mendez, D.Miller, S.W.Padgett, S.V.Paulauskas, A.V.Ramayya, R.Surman, J.A.Winger, M.Wolinska-Cichocka, E.F.Zganjar

β-decay study of neutron-rich bromine and krypton isotopes

RADIOACTIVITY 93Br, 93,94Kr(β-), (β-n)[from 238U(p, F), E=50 MeV]; measured Eβ, Eγ, Iγ, βγ-, γγ-coin, T1/2, delayed neutron emission probability P(n) using LeRIBSS system at HRIBF facility. 92,93Kr; deduced levels, J, π. 92Rb, 93Y(β-); observed gamma rays. Comparison of half-lives and P(n) values with previous experimental studies, and with model predictions.

doi: 10.1103/PhysRevC.88.014309
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2012BR17      Eur.Phys.J. A 48, 184 (2012)

S.Brett, I.Bentley, N.Paul, R.Surman, A.Aprahamian

Sensitivity of the r-process to nuclear masses

COMPILATION Sn; compiled masses, Q from AME-2003, Duflo-Zucker, HFB-21 and FRDM calculations. A≈70-210 suggested, evaluated new mass formula. A≈125-240; compiled, calculated r-process abundances for different scenarii, neutron Q-values.

doi: 10.1140/epja/i2012-12184-4
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2012MA37      Phys.Rev.Lett. 109, 112501 (2012)

M.Madurga, R.Surman, I.N.Borzov, R.Grzywacz, K.P.Rykaczewski, C.J.Gross, D.Miller, D.W.Stracener, J.C.Batchelder, N.T.Brewer, L.Cartegni, J.H.Hamilton, J.K.Hwang, S.H.Liu, S.V.Ilyushkin, C.Jost, M.Karny, A.Korgul, W.Krolas, A.Kuzniak, C.Mazzocchi, A.J.Mendez, K.Miernik, W.Padgett, S.V.Paulauskas, A.V.Ramayya, J.A.Winger, M.Wolinska-Cichocka, E.F.Zganjar

New Half-lives of r-process Zn and Ga Isotopes Measured with Electromagnetic Separation

RADIOACTIVITY 82,83Zn, 85Ga(β-); measured decay products, Eγ, Iγ, Eβ, Iβ; deduced T1/2. Comparison with FRDM, QRPA, density functional calculations.

doi: 10.1103/PhysRevLett.109.112501
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2012MU06      Phys.Rev. C 85, 045801 (2012)

M.R.Mumpower, G.C.McLaughlin, R.Surman

Formation of the rare-earth peak: Gaining insight into late-time r-process dynamics

ATOMIC MASSES A=150-180, N=90-115; calculated effects of neutron capture rates, S(n) and β-decay rates on rare earth peak formation in elemental abundance plot using three nuclear data set simulations: ETFSI-Q, FRDM and HFB-17. R-process nucleosynthesis. Comparison between hot and cold r-process environments and with nuclear models.

doi: 10.1103/PhysRevC.85.045801
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2012MU11      Phys.Rev. C 86, 035803 (2012)

M.R.Mumpower, G.C.McLaughlin, R.Surman

Influence of neutron capture rates in the rare earth region on the r-process abundance pattern

NUCLEAR STRUCTURE Z=58-66, N=94-109, A=153-175; calculated sensitivity of rare earth elemental abundances to neutron capture rates in the rare earth region of the r-process abundance pattern. Introduced concepts of large nuclear flow and flow saturation.

doi: 10.1103/PhysRevC.86.035803
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2012QU01      Phys.Rev. C 85, 035807 (2012)

M.Quinn, A.Aprahamian, J.Pereira, R.Surman, O.Arndt, T.Baumann, A.Becerril, T.Elliot, A.Estrade, D.Galaviz, T.Ginter, M.Hausmann, S.Hennrich, R.Kessler, K.-L.Kratz, G.Lorusso, P.F.Mantica, M.Matos, F.Montes, B.Pfeiffer, M.Portillo, H.Schatz, F.Schertz, L.Schnorrenberger, E.Smith, A.Stolz, W.B.Walters, A.Wohr

β decay of nuclei around 90Se: Search for signatures of a N=56 subshell closure relevant to the r process

NUCLEAR REACTIONS 9Be(136Xe, X)86As/87As/88As/88Se/89Se/90Se/90Br/91Br/92Br/93Br/91Kr/92Kr/93Kr/94Kr/95Kr/93Rb/94Rb/95Rb/96Rb/97Rb/95Sr/96Sr/97Sr/98Sr/99Sr/97Y/98Y/99Y/100Y/101Y/100Zr/101Zr/102Zr/103Zr, E=120 MeV/nucleon; measured fragment spectra by energy loss and time-of-flight, total kinetic energies (TKE) of 97,98,99Sr fragments in 36+, 37+, 38+ charge states, half-lives by fragment-β correlations. Beta Counting System (BCS) at NSCL.

RADIOACTIVITY 87,88As, 88,89,90Se, 90,91,92,93Br, 93,94,95Kr, 95,96,97Rb, 96,97,98,99Sr, 99,100,101Y(β-)[from 9Be(136Xe, X), E=120 MeV/nucleon]; measured Eβ, Eγ, (fragment)β correlations, half-lives. Beta Counting System (BCS) at NSCL and SEGA array. Maximum likelihood and least-squares analyses for half-lives. Comparison of measured half-lives with QRPA calculations used in r process, and with previous measurements. Role of g9/2 proton and h11/2 neutron intruders. No evidence of N=56 subshell closure in 90Se. Relevance to r-process nuclei.

doi: 10.1103/PhysRevC.85.035807
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2010KI02      Phys.Rev. C 81, 025802 (2010)

L.-T.Kizivat, G.Martinez-Pinedo, K.Langanke, R.Surman, G.C.McLaughlin

ψ-ray bursts black hole accretion disks as a site for the νp process

doi: 10.1103/PhysRevC.81.025802
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2009BE01      J.Phys.(London) G36, 025201 (2009)

J.Beun, J.C.Blackmon, W.R.Hix, G.C.McLaughlin, M.S.Smith, R.Surman

Neutron capture on 130Sn during r-process freeze-out

doi: 10.1088/0954-3899/36/2/025201
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2009SU07      Phys.Rev. C 79, 045809 (2009)

R.Surman, J.Beun, G.C.McLaughlin, W.R.Hix

Neutron capture rates near A=130 that effect a global change to the r-process abundance distribution

NUCLEAR REACTIONS Sn, In, Cd(n, γ); calculated σ for A=105-155, neutron capture rates, separation energies. Implications for r-process model.

doi: 10.1103/PhysRevC.79.045809
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2008BE07      Phys.Rev. C 77, 035804 (2008)

J.Beun, G.C.McLaughlin, R.Surman, W.R.Hix

Fission cycling in a supernova r process

doi: 10.1103/PhysRevC.77.035804
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2008SU04      J.Phys.(London) G35, 014059 (2008)

R.Surman, J.Beun, G.C.McLaughlin, S.Kane, W.R.Hix

The role of neutrinos in r-process nucleosynthesis in supernovae and gamma-ray bursts

doi: 10.1088/0954-3899/35/1/014059
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2006KN01      J.Phys.(London) G32, 443 (2006)

J.P.Kneller, G.C.McLaughlin, R.A.Surman

Neutrino scattering, absorption and annihilation above the accretion discs of gamma ray bursts

doi: 10.1088/0954-3899/32/4/004
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2005MC10      Nucl.Phys. A758, 189c (2005)

G.C.McLaughlin, R.Surman

Prospects for obtaining an r process from Gamma Ray Burst Disk Winds

doi: 10.1016/j.nuclphysa.2005.05.036
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2001SU15      Phys.Rev. C64, 035801 (2001)

R.Surman, J.Engel

Changes in r-Process Abundances at Late Times

doi: 10.1103/PhysRevC.64.035801
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1999EN03      Phys.Rev. C60, 014302 (1999)

J.Engel, M.Bender, J.Dobaczewski, W.Nazarewicz, R.Surman

β Decay Rates of r-Process Waiting-Point Nuclei in a Self-Consistent Approach

RADIOACTIVITY 76,78,80Zn, 82Ge, 124,126,128,130Cd, 68,70,72,74,76,78Ni, 82Ge, 80Zn, 78Ni, 76Fe, 74Cr, 72Ti(β-); calculated β-decay T1/2 vs pairing strength. Self-consistent approach. Implications for nucleosynthesis discussed.

doi: 10.1103/PhysRevC.60.014302
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1998PO20      Nucl.Phys. A644, 263 (1998)

D.C.Powell, C.Iliadis, A.E.Champagne, S.E.Hale, V.Y.Hansper, R.A.Surman, K.D.Veal

Low-Energy Resonance Strengths for Proton Capture on Mg and Al Nuclei

NUCLEAR REACTIONS 24,25,26Mg, 27Al(p, p), E ≈ 330-450 MeV; measured σ(θ). 24,25,26Mg, 27Al(p, γ), E ≈ 330-450 MeV; measured Eγ, Iγ; deduced γ-ray brancing ratios, resonance strengths.

doi: 10.1016/S0375-9474(98)00593-4
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1998SU25      Phys.Rev. C58, 2526 (1998)

R.Surman, J.Engel

Neutrino Capture by r-Process Waiting-Point Nuclei

NUCLEAR REACTIONS 78Ni, 124Mo, 190Gd(ν, X), E < 25 MeV; calculated spectrum-averaged capture σ; deduced role of low-lying Gamow-Teller and first forbidden strengths.

doi: 10.1103/PhysRevC.58.2526
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1997SU19      Phys.Rev.Lett. 79, 1809 (1997)

R.Surman, J.Engel, J.R.Bennett, B.S.Meyer

Source of the Rare-Earth Element Peak in r-Process Nucleosynthesis

NUCLEAR STRUCTURE A=150-175; analyzed r-process abundance distribution; deduced rare-earth element peak associated features in nucleosynthesis.

doi: 10.1103/PhysRevLett.79.1809
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