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Search: Author = J.P.Schiffer

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2022SC04      Phys.Rev. C 105, L041302 (2022)

J.P.Schiffer, B.P.Kay, J.Chen

Single-nucleon energies changing with nucleon number

NUCLEAR STRUCTURE A=16-208; analyzed available data on neutron and proton single-particle energies for 33 different orbitals in even-even nuclei. Discussed the dependence of energy of states depending on the number of neutrons and protons. Pointed out that change in energy of neutron states with neutron number or proton states with protons number is approximately a factor of four weaker in magnitude.

doi: 10.1103/PhysRevC.105.L041302
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2021KA13      Phys.Rev. C 103, 024319 (2021)

B.P.Kay, J.P.Schiffer, S.J.Freeman, T.L.Tang, B.D.Cropper, T.Faestermann, R.Hertenberger, J.M.Keatings, P.T.MacGregor, J.F.Smith, H.-F.Wirth

Consistency of nucleon-transfer sum rules in well-deformed nuclei

NUCLEAR REACTIONS 154,156,157,158Gd, 156,158,160,162,164Dy, 168,170,172,174Yb, 162,164,166,168,170Er(d, p), (d, t), E=12.1 MeV; analyzed cross section data from neutron-adding and neutron-removing reactions from experiments at Niels Bohr Institute (NBI), and reported in 1966Bu16, 1967Tj01, 1969Tj01 and 1970Gr46, and complemented by new experiments at MLL-Munich; deduced consistent nucleon-transfer sum rules, as defined in Nilsson-model framework, in well-deformed nuclei.

NUCLEAR REACTIONS 170Er, 174Yb(d, p), (d, t), E=12 MeV; 170Er, 174Yb(p, d), E=18 MeV; measured proton, triton and deuteron spectra, differential σ(θ) using Q3D magnetic spectrometer at the MLL-Munich MP tandem accelerator. 169,171Er, 173,175Yb; deduced levels, J, π, Nilsson configurations, sum rules.

doi: 10.1103/PhysRevC.103.024319
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2021SZ03      Phys.Rev. C 104, 054308 (2021)

S.V.Szwec, D.K.Sharp, B.P.Kay, S.J.Freeman, J.P.Schiffer, P.Adsley, C.Binnersley, N.de Sereville, T.Faestermann, R.F.Garcia Ruiz, F.Hammache, R.Hertenberger, A.Meyer, C.Portail, I.Stefan, A.Vernon, S.Wilkins, H.-F.Wirth

Neutron occupancies and single-particle energies across the stable tin isotopes

NUCLEAR REACTIONS 112,114,116,118,120,122,124Sn(p, d)111Sn/113Sn/115Sn/117Sn/119Sn/121Sn/123Sn, E=21 MeV; 112,114,116,118,120,122,124Sn(3He, α)111Sn/113Sn/115Sn/117Sn/119Sn/121Sn/123Sn, E=36 MeV; 112,114,116,118,120,122,124Sn(d, p)113Sn/115Sn/117Sn/119Sn/121Sn/123Sn/125Sn, E=15 MeV; 112,114,116,118,120,122,124Sn(α, 3He)113Sn/115Sn/117Sn/119Sn/121Sn/123Sn/125Sn, E=41 MeV; measured E(d), I(d), Eα, Iα, E(p), I(p), E(3He), I(3He), differential σ(θ) and analyzed by DWBA calculations; analyzed proton, deuteron, 3He and α spectra using Munich Q3D spectrometer at MLL accelerator facility for (p, d) and (d, p) reactions, and Enge split-pole spectrometer for (3He, α), (α, 3He) reactions at the IJClab of Tandem-Alto facility of Laboratoire de Physique. 112,114,116,118,120,122,124Sn; deduced levels, J, π, L-transfers, spectroscopic factors, summed neutron strengths, fractional occupancies and effective single-particle energies for 2s1/2, 1d3/2, 1d5/2, 0g7/2, and 0h11/2 neutron orbitals. Detailed cross sections at different angles, particle spectra, absolute cross sections and spectroscopic factors are given in the Supplemental Material of the paper.

doi: 10.1103/PhysRevC.104.054308
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2020HO05      Phys.Rev. C 101, 034309 (2020)

A.M.Howard, S.J.Freeman, D.K.Sharp, T.Bloxham, J.A.Clark, C.M.Deibel, B.P.Kay, P.D.Parker, J.P.Schiffer, J.S.Thomas

Neutron-hole strength in N=81 nuclei

NUCLEAR REACTIONS 138Ba, 140Ce, 142Nd, 144Sm(p, d), E=23 MeV; 138Ba, 140Ce, 142Nd, 144Sm(3He, α), E=34 MeV; measured Ed, Id, Eα, Iα, σ(θ) using the Enge split-pole spectrograph and multi-wire gas proportional counter backed by plastic scintillator at the tandem Van de Graaff accelerator of Yale University. 137Ba, 139Ce, 141Nd, 143Sm; deduced levels, J, π, L-transfer, configurations, spectroscopic factors, proton occupancies, neutron hole strengths and centroids, summed strengths. DWBA analysis. Comparison with predictions of particle-vibration coupling calculations.

doi: 10.1103/PhysRevC.101.034309
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2020TA03      Phys.Rev.Lett. 124, 062502 (2020)

T.L.Tang, B.P.Kay, C.R.Hoffman, J.P.Schiffer, D.K.Sharp, L.P.Gaffney, S.J.Freeman, M.R.Mumpower, A.Arokiaraj, E.F.Baader, P.A.Butler, W.N.Catford, G.de Angelis, F.Flavigny, M.D.Gott, E.T.Gregor, J.Konki, M.Labiche, I.H.Lazarus, P.T.MacGregor, I.Martel, R.D.Page, Zs.Podolyak, O.Poleshchuk, R.Raabe, F.Recchia, J.F.Smith, S.V.Szwec, J.Yang

First Exploration of Neutron Shell Structure below Lead and beyond N=126

NUCLEAR REACTIONS 2H(206Hg, p), E=7.38 MeV/nucleon; measured reaction products, Ep, Ip. 207Hg; deduced excitation energies, J, π, σ(θ). Comparison with theoretical calculations.

doi: 10.1103/physrevlett.124.062502
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2018CH36      Phys.Rev. C 98, 014325 (2018)

J.Chen, C.R.Hoffman, T.Ahn, K.Auranen, M.L.Avila, B.B.Back, D.W.Bardayan, D.Blankstein, P.Copp, D.Gorelov, B.P.Kay, S.A.Kuvin, J.P.Lai, D.G.McNeel, P.D.O'Malley, A.M.Rogers, D.Santiago-Gonzalez, J.P.Schiffer, J.Sethi, R.Talwar, J.R.Winkelbauer

Experimental study of the effective nucleon-nucleon interaction using the 21F(d, p)22F reaction

NUCLEAR REACTIONS 2H(21F, p), E=10 MeV/nucleon, [21F secondary beam from 9Be(22Ne, 21F), E=11 MeV/nucleon primary reaction using ATLAS-ANL facility]; measured Ep, Ip, 22Fe recoils, (22F)p-coin, and σ(θ) using HELIcal Orbit Spectrometer (HELIOS). 22F; deduced levels, J, π, spectroscopic factors and strengths, energy centroids and diagonal particle-hole two-body matrix elements (TBMEs) as function of angular momentum, N=14, 16 shell gaps. Distorted wave Born approximation (DWBA) method for theoretical σ(θ) calculations. Comparison with theoretical spectroscopic strengths by shell-model calculation using the USDA and USDB interactions.

doi: 10.1103/PhysRevC.98.014325
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2018SA13      Phys.Rev.Lett. 120, 122503 (2018)

D.Santiago-Gonzalez, K.Auranen, M.L.Avila, A.D.Ayangeakaa, B.B.Back, S.Bottoni, M.P.Carpenter, J.Chen, C.M.Deibel, A.A.Hood, C.R.Hoffman, R.V.F.Janssens, C.L.Jiang, B.P.Kay, S.A.Kuvin, A.Lauer, J.P.Schiffer, J.Sethi, R.Talwar, I.Wiedenhover, J.Winkelbauer, S.Zhu

Probing the Single-Particle Character of Rotational States in 19F Using a Short-Lived Isomeric Beam

NUCLEAR REACTIONS 2H(18F, p), E=14 MeV/nucleon; measured reaction products, Ep, Ip. 19F; deduced energy levels, J, π, relative spectroscopic factors, rotational band. Comparison with shell-model calculations.

doi: 10.1103/PhysRevLett.120.122503
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2017FR08      Phys.Rev. C 96, 054325 (2017)

S.J.Freeman, D.K.Sharp, S.A.McAllister, B.P.Kay, C.M.Deibel, T.Faestermann, R.Hertenberger, A.J.Mitchell, J.P.Schiffer, S.V.Szwec, J.S.Thomas, H.-F.Wirth

Experimental study of the rearrangements of valence protons and neutrons amongst single-particle orbits during double-β decay in 100Mo

NUCLEAR REACTIONS 98,100Mo, 100,102Ru(d, p), (p, d), (3He, α), (3He, d), E(d)=15 MeV, E(p)=24 MeV, E(3He)=36 MeV; measured light-ion particle spectra, cross sections, angular distributions using Q3D magnetic spectrometer at Munich MP tandem accelerator facility. Enriched targets. 97,99,101Mo, 99,101,103Ru, 99,101Tc, 101,103Rh; deduced levels, L-transfers, J, π, spectroscopic factors, cross section ratios. DWBA analysis of σ(θ) data. 98,100Mo, 100,102Ru; deduced neutron occupancies from neutron-removing reactions, and proton vacancies from (3He, d) reaction. 100Mo, 100Ru; deduced neutron occupancy and proton vacancy for the valence orbits, and compared to predictions from interacting boson model (IBM), and two different Woods-Saxon calculations. See Supplemental Material (reference 46 in the paper) for details of experimental cross section data and spectroscopic factors for individual states in final nuclei.

RADIOACTIVITY 100Mo(2β-); deduced detailed quantitative assessment of rearrangements of protons and neutrons amongst the valence single-particle orbitals during double-β decay process, with relevance to nuclear matrix element for 0νββ and 2νββ decay modes.

doi: 10.1103/PhysRevC.96.054325
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2017TA21      Phys.Rev. C 96, 024310 (2017)

R.Talwar, B.P.Kay, A.J.Mitchell, S.Adachi, J.P.Entwisle, Y.Fujita, G.Gey, S.Noji, H.J.Ong, J.P.Schiffer, A.Tamii

High-j neutron excitations outside 136Xe

NUCLEAR REACTIONS 136Xe(α, 3He), E=100 MeV; measured 3He spectra and σ(θ) using Grand-Raiden (GR) magnetic spectrometer, vertical drift chambers and scintillators at RCNP-Osaka accelerator facility. Enriched 136Xe target. 137Xe; deduced levels, L-transfers, J, π, spectroscopic factors, configuration. DWBA calculations using different parametrizations of optical-model potentials. Discussed details and systematics of high-j, 9/2- and 13/2+ single-neutron excitations in N=83 isotones 135Te, 137Xe, 139Ba, 141Ce, 143Nd, 145Sm, 147Gd, 149Dy, 151Er and 153Yb, and comparison with two-level mixing model calculations.

NUCLEAR REACTIONS 144Sm(α, 3He)145Sm, E=100 MeV; measured reaction products; deduced absolute σ, σ(θ), outgoing 3He spectra, excitation energies, mixing matrix elements parameters, normalized spectroscopic factors.

doi: 10.1103/PhysRevC.96.024310
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2016BE08      Phys.Rev. C 93, 044323 (2016)

S.Bedoor, A.H.Wuosmaa, M.Albers, M.Alcorta, S.Almaraz-Calderon, B.B.Back, P.F.Bertone, C.M.Deibel, C.R.Hoffman, J.C.Lighthall, S.T.Marley, D.G.Mcneel, R.C.Pardo, K.E.Rehm, J.P.Schiffer, D.V.Shetty

Structure of 14C and 14B from the 14, 15C(d, 3He)13, 14B reactions

NUCLEAR REACTIONS 14C(d, 3He)13B, E=17.1 MeV/nucleon; 15C(d, 3He)14B, E=15.6 MeV/nucleon, [secondary 15C beam from 2H(14C, 15C) primary reaction]; measured 3He spectra, σ(θ) using helical orbit spectrometer (HELIOS) at ANL facility. DWBA analysis of σ(θ) data. 13,14B; deduced levels, J, π, l-transfers, spectroscopic factors, configurations. Comparison with previous experimental data and shell-model calculations with WBT and WBP interactions using the code NUSHELLX. 14,15C, 13,14B; calculated shell-model occupation numbers.

doi: 10.1103/PhysRevC.93.044323
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2235. Data from this article have been entered in the XUNDL database. For more information, click here.


2016EN04      Phys.Rev. C 93, 064312 (2016)

J.P.Entwisle, B.P.Kay, A.Tamii, S.Adachi, N.Aoi, J.A.Clark, S.J.Freeman, H.Fujita, Y.Fujita, T.Furuno, T.Hashimoto, C.R.Hoffman, E.Ideguchi, T.Ito, C.Iwamoto, T.Kawabata, B.Liu, M.Miura, H.J.Ong, J.P.Schiffer, D.K.Sharp, G.Susoy, T.Suzuki, S.V.Szwec, M.Takaki, M.Tsumura, T.Yamamoto

Change of nuclear configurations in the neutrinoless double-β decay of 130Te → 130Xe and 136Xe → 136Ba

NUCLEAR REACTIONS 128,130Te, 130,132,134,136Xe, 136,138Ba(d, 3He), E=101 MeV; measured Ed, Id, σ(θ) using Grand Raiden (GR) spectrometer at RCNP-Osaka cyclotron facility. 127,129Sb, 129,131,133,135I, 135,137Cs; deduced levels, L-transfers, spectroscopic factors. DWBA and optical model analysis. 128,130Te, 130,132,134,136Xe, 136,138Ba; deduced ground state proton occupancies. Comparison with shell-model and interacting boson-model calculations.

RADIOACTIVITY 130Te, 136Xe(2β-); deduced change in the configuration of valence protons between the initial and final states in the 0νββ decay mode from measurements of the cross sections in (d, 3He) reaction, nuclear matrix elements.

doi: 10.1103/PhysRevC.93.064312
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2016HO14      Phys.Rev. C 94, 024330 (2016)

C.R.Hoffman, B.P.Kay, J.P.Schiffer

Ordering of the 0d5/2 and 1s1/2 proton levels in light nuclei

NUCLEAR STRUCTURE 9B, 11,12,13,14N, 14,15O, 15,16,17F; 9,11Be, 12B, 13,14,15C, 14,15,16N, 17O; calculated 1/2+ and 5/2+ proton and neutron single-particle excitations, and compared with experimental data; deduced ordering of the 0d5/2 and 1s1/2 proton orbitals. Woods-Saxon potential calculations.

doi: 10.1103/PhysRevC.94.024330
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2016SZ03      Phys.Rev. C 94, 054314 (2016)

S.V.Szwec, B.P.Kay, T.E.Cocolios, J.P.Entwisle, S.J.Freeman, L.P.Gaffney, V.Guimaraes, F.Hammache, P.P.McKee, E.Parr, C.Portail, J.P.Schiffer, N.de Sereville, D.K.Sharp, J.F.Smith, I.Stefan

Rearrangement of valence neutrons in the neutrinoless double-β decay of 136Xe

NUCLEAR REACTIONS 134Ba(d, p), E=15 MeV; 134Ba(α, 3He), E=40.1 MeV; 136Ba(p, d), E=23 MeV; 134Ba(3He, α), E=32.0 MeV; measured outgoing proton, deuteron, 3He and α spectra, σ(θ) using an Enge split-pole spectrometer at the ALTO Tandem accelerator at IPN-Orsay. DWBA analysis using PTOLEMY code. 135Ba; deduced levels, J, π. 136Xe, 134,136Ba; deduced ground-state neutron occupancies. Comparisons with theoretical calculations using various nuclear-structure models. Relevance to initial and final state in the 0νββ decay mode of 136Xe.

doi: 10.1103/PhysRevC.94.054314
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2014HO08      Phys.Rev. C 89, 061305 (2014)

C.R.Hoffman, B.P.Kay, J.P.Schiffer

Neutron s states in loosely bound nuclei

NUCLEAR STRUCTURE 9He, 9,11,13Be, 12,14B, 13,14,15,16C, 14,15,16N, 17O; analyzed and reviewed S(n), energies of 1/2+ and 5/2+ states to explore behavior of neutron s states near thresholds with simple Woods-Saxon potentials; deduced effect of lingering of neutron s states just below threshold on increases in radii of the neutron density distributions, and neutron halos in nuclei in different mass regions.

doi: 10.1103/PhysRevC.89.061305
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2014WU10      Phys.Rev. C 90, 061301 (2014)

A.H.Wuosmaa, J.P.Schiffer, S.Bedoor, M.Albers, M.Alcorta, S.Almaraz-Calderon, B.B.Back, P.F.Bertone, C.M.Deibel, C.R.Hoffman, J.C.Lighthall, S.T.Marley, R.C.Pardo, K.E.Rehm, D.V.Shetty

Stretched states in 12, 13B with the (d, α) reaction

NUCLEAR REACTIONS 2H(14C, α)12B, E=17.1 MeV/nucleon; 2H(15C, α)13B, E=15.7 MeV/nucleon, [secondary 15C beam from 2H(14C, 15C) primary reaction]; measured Eα, Iα, 12,13B spectra, (12B)α-, (13B)α-coin, σ(θ) using Helical Orbit Spectrometer (HELIOS) and Si detector telescopes at ATLAS-ANL facility. 12,13B; deduced levels, J, π, configuration. DWBA analysis. Population of stretched 3+ states.

doi: 10.1103/PhysRevC.90.061301
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2013BE25      Phys.Rev. C 88, 011304 (2013)

S.Bedoor, A.H.Wuosmaa, J.C.Lighthall, M.Alcorta, B.B.Back, P.F.Bertone, B.A.Brown, C.M.Deibel, C.R.Hoffman, S.T.Marley, R.C.Pardo, K.E.Rehm, A.M.Rogers, J.P.Schiffer, D.V.Shetty

Structure of 14B and the evolution of N=9 single-neutron isotones

NUCLEAR REACTIONS 2H(13B, p), E=204 MeV, [13B secondary beam from 9Be(14C, 10B), E=240 MeV primary reaction]; measured proton spectra, σ(θ), using HELIOS spectrometer at ATLAS-ANL facility. 14B; deduced levels, J, π, spectroscopic factors, wave functions, effective single-neutron energies. DWBA analysis of σ(θ) data. N=9 isotones; trend of effective single particle energies. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.88.011304
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2013HO21      Phys.Rev. C 88, 044317 (2013)

C.R.Hoffman, M.Albers, M.Alcorta, S.Almaraz-Calderon, B.B.Back, S.I.Baker, S.Bedoor, P.F.Bertone, B.P.Kay, J.C.Lighthall, T.Palchan, R.C.Pardo, G.Perdikakis, K.E.Rehm, A.M.Rogers, D.Santiago-Gonzalez, C.Yuan, J.P.Schiffer

Single-neutron excitations in 18N

NUCLEAR REACTIONS 2H(17N, p), [17N secondary beam from 9Be(18O, X), E=14.7 MeV/nucleon primary reaction], E=13.6 MeV/nucleon; measured E(p), I(p), σ(θ) using HELIOS spectrometer and array at ATLAS-ANL facility. 18N; deduced levels, J, π, l-transfer, spectroscopic factors, spectroscopic strengths, configuration. DWBA analysis of σ(θ) data for (d, p) reaction in inverse kinematics. 17C, 18N, 19O; systematics of low-lying states in N=11 isotones, and comparison with shell-model calculations.

doi: 10.1103/PhysRevC.88.044317
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2013KA04      Phys.Rev. C 87, 011302 (2013)

B.P.Kay, T.Bloxham, S.A.McAllister, J.A.Clark, C.M.Deibel, S.J.Freedman, S.J.Freeman, K.Han, A.M.Howard, A.J.Mitchell, P.D.Parker, J.P.Schiffer, D.K.Sharp, J.S.Thomas

Valence neutron properties relevant to the neutrinoless double-β decay of 130Te

NUCLEAR REACTIONS 128,130Te(p, d), E=23 MeV; 128,130Te, 130,132Xe(d, p), E=15 MeV; 128,130Te, 130,132Xe(α, 3He), E=50 MeV; 130Te(3He, α), E=40 MeV; 132Xe(p, t), E=23 MeV; measured deuteron, proton, triton, 3He, α spectra, σ(θ) using Enge-split pole magnetic spectrograph at Yale Tandem accelerator facility. 127,129,131Te, 130,131,133Xe; deduced levels, J, π, L-transfers. 128,130Te, 130,132Xe; deduced neutron vacancies for active orbitals. Comparison with calculations within both the quasiparticle random-phase approximation and shell-model frameworks. Discussed relevance to neutrinoless double β decay of 130Te.

doi: 10.1103/PhysRevC.87.011302
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2013KA14      Acta Phys.Pol. B44, 349 (2013)

B.P.Kay, M.Alcorta, B.B.Back, S.Bedoor, P.F.Bertone, S.I.Baker, J.A.Clark, C.M.Deibel, B.J.DiGiovine, S.J.Freeman, C.R.Hoffman, H.Y.Lee, J.C.Lighthall, A.Macchiavelli, S.T.Marley, P.Muller, R.Pardo, K.E.Rehm, A.Rojas, A.M.Rogers, J.Rohrer, D.Santiago-Gonzalez, J.P.Schiffer, D.K.Sharp, D.V.Shetty, J.S.Thomas, I.Wiedenhover, A.H.Wuosmaa

Transfer Reactions and the Structure of Neutron-rich Nuclei

doi: 10.5506/APhysPolB.44.349
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2013KA36      Phys.Rev.Lett. 111, 042502 (2013)

B.P.Kay, J.P.Schiffer, S.J.Freeman

Quenching of Cross Sections in Nucleon Transfer Reactions

doi: 10.1103/PhysRevLett.111.042502
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2013RO10      Phys.Rev. C 87, 051305 (2013)

A.Roberts, A.M.Howard, J.J.Kolata, A.N.Villano, F.D.Becchetti, P.A.DeYoung, M.Febbraro, S.J.Freeman, B.P.Kay, S.A.McAllister, A.J.Mitchell, J.P.Schiffer, J.S.Thomas, R.O.Torres-Isea

Proton pair correlations and the neutrinoless double-β decay of 76Ge

NUCLEAR REACTIONS 74,76Ge(3He, n), E=16 MeV; measured E(n), I(n), time-of-flight, σ(θ) for g.s. and first 2+ state using the Neutron Wall at Notre Dame. 76,78Se; deduced levels, proton pair correlations. DWBA analysis. Comparison with quasiparticle random phase approximation (QRPA) model calculations. Relevance to matrix elements for 0νββ decay of 76Ge. Systematics of ground-state cross sections on fpg-shell nuclei of A=60-90, and comparison with theoretical models. No evidence for the breaking of the BCS approximation for paired protons.

doi: 10.1103/PhysRevC.87.051305
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2013SC06      Phys.Rev. C 87, 034306 (2013)

J.P.Schiffer, C.R.Hoffman, B.P.Kay, J.A.Clark, C.M.Deibel, S.J.Freeman, M.Honma, A.M.Howard, A.J.Mitchell, T.Otsuka, P.D.Parker, D.K.Sharp, J.S.Thomas

Valence nucleon populations in the Ni isotopes

NUCLEAR REACTIONS 58,60,62,64Ni(d, p), E=10 MeV; 58,60,62,64Ni(α, 3He), (α, t), E=38 MeV; 58,60,62,64Ni(p, d), E=28 MeV; 58,60,62,64Ni(3He, d), E=18 MeV; 58,60,62,64Ni(3He, α), E=25 MeV; measured proton, deuteron, triton, 3He, α spectra, σ(θ) using Enge-split pole magnetic spectrograph at Yale tandem accelerator facility. 57,59,61,63,65Ni, 59,61,63,65Cu; deduced levels, J, π, l-transfers, spectroscopic factors. DWBA analysis. 58,60,62,64Ni; deduced neutron occupancies, proton vacancies, energy centroids of the neutron, neutron-hole, and proton single-particle excitations. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.87.034306
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1991. Data from this article have been entered in the XUNDL database. For more information, click here.


2013SH02      Phys.Rev. C 87, 014312 (2013)

D.K.Sharp, B.P.Kay, J.S.Thomas, S.J.Freeman, J.P.Schiffer, B.B.Back, S.Bedoor, T.Bloxham, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, A.J.Mitchell, T.Otsuka, P.D.Parker, K.E.Rehm, D.V.Shetty, A.H.Wuosmaa

Neutron single-particle strength outside the N=50 core

NUCLEAR REACTIONS 88Sr, 90Zr, 92Mo(d, p), E=15 MeV; 88Sr, 90Zr, 92Mo(α, 3He), E=50 MeV; measured proton and 3He spectra, σ(θ) using Enge-split pole magnetic spectrograph at Yale. 2H(86Kr, p), E=10 MeV/nucleon; measured proton spectra, σ(θ) using HELIOS spectrometer at ANL. 87Kr, 89Sr, 91Zr, 93Mo; deduced levels, J, π, absolute σ, L-transfers, spectroscopic factors, centroids of single-particle strengths. DWBA analysis.

doi: 10.1103/PhysRevC.87.014312
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1975. Data from this article have been entered in the XUNDL database. For more information, click here.


2012FR10      J.Phys.(London) G39, 124004 (2012)

S.J.Freeman, J.P.Schiffer

Constraining the 0ν2β matrix elements by nuclear structure observables

RADIOACTIVITY 76Ge, 130Te, 100Mo, 150Nd, 136Xe(2β-); analyzed available data; deduced reliability of nuclear matrix element calculations.

doi: 10.1088/0954-3899/39/12/124004
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2012HO11      Phys.Rev. C 85, 054318 (2012)

C.R.Hoffman, B.B.Back, B.P.Kay, J.P.Schiffer, M.Alcorta, S.I.Baker, S.Bedoor, P.F.Bertone, J.A.Clark, C.M.Deibel, B.DiGiovine, S.J.Freeman, J.P.Greene, J.C.Lighthall, S.T.Marley, R.C.Pardo, K.E.Rehm, A.Rojas, D.Santiago-Gonzalez, D.K.Sharp, D.V.Shetty, J.S.Thomas, I.Wiedenhover, A.H.Wuosmaa

Experimental study of the 19O(d, p)20O reaction in inverse kinematics

NUCLEAR REACTIONS 2H(19O, p), [19O secondary beam from 2H(18O, 19O), E=8.06 MeV/nucleon primary reaction], E=6.61 MeV/nucleon; measured E(p), I(p), 19,20O spectra, (recoils)p-coin, energy loss, cross sections, proton yields, σ(θ) using HELIOS spectrometer at Atlas facility. 20O; deduced levels, L-transfers, J, π, spectroscopic factors, T=1 diagonal two-body matrix elements. DWBA analysis. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.85.054318
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2012HO26      J.Phys.:Conf.Ser. 381, 012098 (2012)

A.M.Howard, S.J.Freeman, J.P.Schiffer, T.Bloxham, J.A.Clark, C.M.Deibel, B.P.Kay, P.D.Parker, D.K.Sharp, J.S.Thomas

Neutron-hole strength in the N = 81 isotone

NUCLEAR REACTIONS 138Ba, 140Ce, 142Nd, 144Sm(p, d), E=23 MeV;138Ba, 140Ce, 142Nd, 144Sm(3He, α), E=34 MeV; measured light reaction products E(particle), I(particle, θ) using Enge split-pole spectrograph, position-sensitive IC and scintillator; deduced σ(θ), spectroscopic strength for specified angular momentum transfers, single-particle binding energy.

doi: 10.1088/1742-6596/381/1/012098
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2012KA44      J.Phys.:Conf.Ser. 381, 012095 (2012)

B.P.Kay, M.Alcorta, B.B.Back, S.I.Baker, S.Bedoor, T.Bloxham, J.A.Clark, C.M.Deibel, S.J.Freeman, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, A.J.Mitchell, K.E.Rehm, J.P.Schiffer, D.K.Sharp, D.V.Shetty, J.S.Thomas, A.H.Wuosmaa, S.Zhu

HELIOS - progress and possibilities

doi: 10.1088/1742-6596/381/1/012095
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2012MC06      J.Phys.:Conf.Ser. 381, 012043 (2012)

S.A.McAllister, B.P.Kay, S.J.Freeman, J.P.Schiffer, C.M.Diebel, T.Bloxham, A.M.Howard, P.D.Parker, D.K.Sharp, J.S.Thomas

Constraining neutrinoless double β decay matrix elements in 130Te

NUCLEAR REACTIONS 128,130Te(p, t), E=23 MeV;128,130Te(d, p), (α, α'), E=15 MeV; 128,130Te(3He, α), E=40 MeV;128,130Te(α, 3He), E=50 MeV; measured reaction products at specified (forward) angles; deduced (d, p) spectroscopic factors. Preliminary. Other reactions under analysis.

doi: 10.1088/1742-6596/381/1/012043
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2012MI26      J.Phys.:Conf.Ser. 381, 012099 (2012)

A.J.Mitchell, S.J.Freeman, J.P.Schiffer, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, B.P.Kay, P.D.Parker, D.K.Sharp, J.S.Thomas

Investigating trends in proton single-particle states in Z = 51 isotopes using transfer reactions

NUCLEAR REACTIONS 112,114,116,118,120,122,124Sn(α, t), E=37.5 MeV;112,114,116,118,120,122,124Sn(3He, d), E=25 MeV; measured E(particle), I(particle, θ) using Enge split-pole spectrometer; calculated σ(θ) using DWBA; deduced spectroscopic factors, σ(θ) for specified l-transfer, occupancies of neutron orbitals. Occupation of h11/2 increases rapidly with N. Preliminary.

doi: 10.1088/1742-6596/381/1/012099
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2012SC01      Phys.Rev.Lett. 108, 022501 (2012)

J.P.Schiffer, C.R.Hoffman, B.P.Kay, J.A.Clark, C.M.Deibel, S.J.Freeman, A.M.Howard, A.J.Mitchell, P.D.Parker, D.K.Sharp, J.S.Thomas

Test of Sum Rules in Nucleon Transfer Reactions

NUCLEAR STRUCTURE 58,60,62,64Ni; calculated spectroscopic factors for neutron transfer, valence-orbit occupancies. Macfarlane-French sum rules.

NUCLEAR REACTIONS Ni(α, α), E=9 MeV; Ni(d, p), E=10 MeV; Ni(p, d), E=28 MeV; Ni(3He, d), E=18 MeV; Ni(α, t), E=38 MeV; measured reaction products. 58,60,62,64Ni; deduced spectroscopic factors, neutron occupancies. DWBA calculations.

doi: 10.1103/PhysRevLett.108.022501
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2012SC20      J.Phys.:Conf.Ser. 381, 012002 (2012)

J.P.Schiffer

Perspectives on nuclear physics over the past 100 years

doi: 10.1088/1742-6596/381/1/012002
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2012SH40      J.Phys.:Conf.Ser. 381, 012100 (2012)

D.K.Sharp, B.P.Kay, S.J.Freeman, J.P.Schiffer, B.B.Back, T.Bloxham, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, A.J.Mitchell, P.D.Parker, J.S.Thomas, A.H.Wuosmaa

Trends in the g7/2 and h11/2 neutron single-particle energies in N = 51 isotones

NUCLEAR REACTIONS 88Sr, 90Zr, 92Mo(d, p), E=15 MeV;88Sr, 90Zr, 92Mo(α, 3He), E=50 MeV; measured E(3He), I(3He, θ), Ep, Ip(θ) using Enge split-pole spectrometer; calculated σ(θ), spectroscopic factors using DWBA code PTOLEMY; deduced spectroscopic factors for specified l-transfers. 2H(86Kr, p), E=10 MeV/nucleon; measured Ep, Ip(θ) using HELIOS spectrometer; calculated σ(θ) using DWBA; deduced σ(θ).

doi: 10.1088/1742-6596/381/1/012100
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2012TH07      Phys.Rev. C 86, 047304 (2012)

J.S.Thomas, S.J.Freeman, C.M.Deibel, T.Faestermann, R.Hertenberger, B.P.Kay, S.A.McAllister, A.J.Mitchell, J.P.Schiffer, D.K.Sharp, H.-F.Wirth

Neutron pair correlations in A=100 nuclei involved in neutrinoless double-β decay

NUCLEAR REACTIONS 98,100Mo, 100,102Ru(p, t), E=24 MeV; measured triton spectra, σ, σ(θ) using Q3D magnetic spectrograph at MLL Munich facility. 96,98Mo, 98,100Ru; deduced levels, J, π, σ(6°)/σ(15°) ratios, L-transfers. DWBA analysis. 98,100Mo(3He, 3He), E=12 MeV; measured target thickness and solid angle subtended by the spectrograph aperture. Relevance to pairing properties, and matrix elements of 0νββ decay of 100Mo to 100Ru.

doi: 10.1103/PhysRevC.86.047304
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2011KA27      Phys.Rev. C 84, 024325 (2011)

B.P.Kay, J.P.Schiffer, S.J.Freeman, C.R.Hoffman, B.B.Back, S.I.Baker, S.Bedoor, T.Bloxham, J.A.Clark, C.M.Deibel, A.M.Howard, J.C.Lighthall, S.T.Marley, K.E.Rehm, D.K.Sharp, D.V.Shetty, J.S.Thomas, A.H.Wuosmaa

Single-neutron energies outside 136Xe

NUCLEAR REACTIONS 2H(136Xe, p), E=10 MeV/nucleon; measured Ep, Ip, time of flight, absolute σ, σ(θ) using Helios spectrometer at the ATLAS facility at ANL. 137Xe; deduced levels, J, π, l-transfers, spectroscopic factors, configurations. DWBA analysis of σ(θ) distributions.

doi: 10.1103/PhysRevC.84.024325
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2011KA48      J.Phys.:Conf.Ser. 312, 092034 (2011)

B.P.Kay, J.P.Schiffer, S.J.Freeman, B.B.Back, S.Bedoor, S.I.Baker, T.Bloxham, J.A.Clark, C.M.Deibel, C.R.Hoffman, A.M.Howard, J.C.Lighthall, S.T.Marley, K.E.Rehm, D.K.Sharp, D.V.Shetty, J.S.Thomas, A.H.Wuosmaa

Study of valence neutrons in 136Xe with HELIOS

NUCLEAR REACTIONS 2H, C(136Xe, p), (136Xe, d), E=5, 10 MeV/nucleon; measured E(particle), I(particle, θ), A/Q ratio using position-sensitive Si detectors, ToF using radio-frequency of ATLAS facility; deduced σ(p, θ) for specified angular momentum transfer; calculated σ(θ) for specified angular momentum transfer using DWBA code PTOLEMY.

doi: 10.1088/1742-6596/312/9/092034
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2010BA06      Phys.Rev.Lett. 104, 132501 (2010)

B.B.Back, S.I.Baker, B.A.Brown, C.M.Deibel, S.J.Freeman, B.J.DiGiovine, C.R.Hoffman, B.P.Kay, H.Y.Lee, J.C.Lighthall, S.T.Marley, R.C.Pardo, K.E.Rehm, J.P.Schiffer, D.V.Shetty, A.W.Vann, J.Winkelbauer, A.H.Wuosmaa

First Experiment with HELIOS: The Structure of 13B

NUCLEAR REACTIONS 12B(d, p), E=75 MeV; measured Ep, Ip, recoil ions; deduced σ(θ), spectroscopic factors, constrained J, π.

doi: 10.1103/PhysRevLett.104.132501
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2010BL06      Phys.Rev. C 82, 027308 (2010)

T.Bloxham, B.P.Kay, J.P.Schiffer, J.A.Clark, C.M.Deibel, S.J.Freeman, S.J.Freedman, A.M.Howard, S.A.McAllister, P.D.Parker, D.K.Sharp, J.S.Thomas

Pair correlations in the neutrinoless double-β decay candidate 130Te

NUCLEAR REACTIONS 128,130Te(p, t), E=23 MeV; measured triton spectra, σ(θ). 126,128Te; deduced levels, L-transfers. Split-pole magnetic spectrograph and gas-filled focal plane detector. Comparison with data for 128,130Te(3He, n) reactions. Relevance to calculation of the matrix element for neutrinoless double-β decay of 130Te.

doi: 10.1103/PhysRevC.82.027308
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2010LE02      Phys.Rev. C 81, 015802 (2010)

H.Y.Lee, J.P.Greene, C.L.Jiang, R.C.Pardo, K.E.Rehm, J.P.Schiffer, A.H.Wuosmaa, N.J.Goodman, J.C.Lighthall, S.T.Marley, K.Otsuki, N.Patel, M.Beard, M.Notani, X.D.Tang

Experimental study of the 11, 12B(n, γ) reactions and their influence on r-process nucleosynthesis of light elements

NUCLEAR REACTIONS 2H(11B, p), E=81 MeV; 2H(12B, p), E=75 MeV; measured proton and 11,12,13B particle spectra, σ(θ). 12,13B; deduced levels, J, π, l-transfers. Comparison with DWBA calculations. 11B, 12B(n, γ); deduced reaction rates of astrophysical relevance, and abundances of 11B and 12B in r process.

doi: 10.1103/PhysRevC.81.015802
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2010TA05      Phys.Rev. C 81, 045809 (2010)

X.D.Tang, K.E.Rehm, I.Ahmad, C.R.Brune, A.Champagne, J.P.Greene, A.Hecht, D.J.Henderson, R.V.F.Janssens, C.L.Jiang, L.Jisonna, D.Kahl, E.F.Moore, M.Notani, R.C.Pardo, N.Patel, M.Paul, G.Savard, J.P.Schiffer, R.E.Segel, S.Sinha, A.H.Wuosmaa

Determination of the E1 component of the low-energy 12C(α, γ)16O cross section

RADIOACTIVITY 16N(β-α); measured Eα, Iα, α12C-coin, half-life; deduced E1 component of the S factor for 12C(α, γ)16O reaction using a set of twin ionization chambers. R-matrix analysis. Comparison with previous studies.

NUCLEAR REACTIONS 2H(15N, p)15N/16N/16O/20Ne, E=82 MeV; measured fragment yields.

doi: 10.1103/PhysRevC.81.045809
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2010WU06      Phys.Rev.Lett. 105, 132501 (2010)

A.H.Wuosmaa, B.B.Back, S.Baker, B.A.Brown, C.M.Deibel, P.Fallon, C.R.Hoffman, B.P.Kay, H.Y.Lee, J.C.Lighthall, A.O.Macchiavelli, S.T.Marley, R.C.Pardo, K.E.Rehm, J.P.Schiffer, D.V.Shetty, M.Wiedeking

15C(d, p)16C Reaction and Exotic Behavior in 16C

NUCLEAR REACTIONS 2H(15C, p)16C, E=123 MeV; measured proton spectra; deduced σ(θ), relative spectroscopic factors, excitation energies, wave functions. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.105.132501
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2009JI08      Phys.Rev. C 80, 044613 (2009)

C.L.Jiang, K.E.Rehm, D.Ackermann, I.Ahmad, J.P.Greene, B.Harss, D.Henderson, W.F.Henning, R.V.F.Janssens, J.Nolen, R.C.Pardo, P.Reiter, J.P.Schiffer, D.Seweryniak, A.Sonzogni, J.Uusitalo, I.Wiedenhover, A.H.Wuosmaa, F.Brumwell, G.McMichael, M.Paul, R.E.Segel

Experimental study of the 56Ni(3He, d)57Cu reaction in inverse kinematics

NUCLEAR REACTIONS 3He(56Ni, d), E=250 MeV; measured Ed, Id, σ, σ(θ). 57Cu; deduced levels, J, π, spectroscopic factors. DWBA analysis. Discussed implications for 56Ni(p, γ)57Cu reaction of astrophysical interest.

doi: 10.1103/PhysRevC.80.044613
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2009KA06      Phys.Rev. C 79, 021301 (2009)

B.P.Kay, J.P.Schiffer, S.J.Freeman, T.Adachi, J.A.Clark, C.M.Deibel, H.Fujita, Y.Fujita, P.Grabmayr, K.Hatanaka, D.Ishikawa, H.Matsubara, Y.Meada, H.Okamura, K.E.Rehm, Y.Sakemi, Y.Shimizu, H.Shimoda, K.Suda, Y.Tameshige, A.Tamii, C.Wrede

Nuclear structure relevant to neutrinoless double β decay: The valence protons in 76Ge and 76Se

NUCLEAR REACTIONS 74,76Ge, 76,78Se(d, 3He), (polarized d, 3He), E=80 MeV; measured 3He spectra, σ, angular distributions, vector analyzing powers. 74,76Ge, 76,78Se(3He, d), E=72 MeV; measured deuteron spectra, σ, angular distributions. 73,75Ga, 75,77As, 77,79Br; deduced levels, J, π, angular momentum transfers, spectroscopic factors. Comparison of angular distribution and polarization data with distorted wave Born approximation (DWBA) calculations. 76Ge, 76Se; deduced occupancies of valence proton orbitals in ground states. Comparison of occupancies of valence proton and neutron orbitals in ground states of 76Ge and 76Se with QRPA and shell-model calculations. Discussed implications for neutrinoless double β decay of 76Ge to 76Se.

doi: 10.1103/PhysRevC.79.021301
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2009KA22      Phys.Rev. C 80, 017301 (2009)

B.P.Kay, C.J.Chiara, J.P.Schiffer, F.G.Kondev, S.Zhu, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, E.A.McCutchan, D.Seweryniak, I.Stefanescu

Properties of excited states in 77Ge

NUCLEAR REACTIONS 76Ge(13C, 12C), E=27-36 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), relative σ. 77Ge; deduced levels, J, π, multipolarity. Comparison of measured σ with DWBA calculations.

doi: 10.1103/PhysRevC.80.017301
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2008KA01      Phys.Lett. B 658, 216 (2008)

B.P.Kay, S.J.Freeman, J.P.Schiffer, J.A.Clark, C.Deibel, A.Heinz, A.Parikh, C.Wrede

High-j single-particle neutron states outside the N = 82 core

NUCLEAR REACTIONS 138Ba, 140Ce, 142Nd, 144Sm(α, 3He), E=51 MeV; measured σ(θ), excitation energy spectra; deduced spectroscopic factor and single-neutron energies.

doi: 10.1016/j.physletb.2007.11.033
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2008SC03      Phys.Rev.Lett. 100, 112501 (2008)

J.P.Schiffer, S.J.Freeman, J.A.Clark, C.Deibel, C.R.Fitzpatrick, S.Gros, A.Heinz, D.Hirata, C.L.Jiang, B.P.Kay, A.Parikh, P.D.Parker, K.E.Rehm, A.C.C.Villari, V.Werner, C.Wrede

Nuclear Structure Relevant to Neutrinoless Double β Decay: 76Ge and 76Se

NUCLEAR REACTIONS 74,76Ge, 76,78Se(d, p), E=15 MeV; 76Ge, 76Se(p, d), E=23 MeV; 74,76Ge, 76,78Se(3He, α), E=26 MeV; 74,76Ge, 76,78Se(α, 3He), E=40 MeV; measured reaction products energy spectra, cross sections. Deduced summed spectroscopic strengths, neutron vacancies.

doi: 10.1103/PhysRevLett.100.112501
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2008SC11      Nucl.Phys. A805, 98c (2008)

J.P.Schiffer

Perspective on the Development of Nuclear Physics in the Past 100 Years

doi: 10.1016/j.nuclphysa.2008.02.231
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2008WU05      Phys.Rev. C 78, 041302 (2008)

A.H.Wuosmaa, J.P.Schiffer, K.E.Rehm, J.P.Greene, D.J.Henderson, R.V.F.Janssens, C.L.Jiang, L.Jisonna, J.C.Lighthall, S.T.Marley, E.F.Moore, R.C.Pardo, N.Patel, M.Paul, D.Peterson, S.C.Pieper, G.Savard, R.E.Segel, R.H.Siemssen, X.D.Tang, R.B.Wiringa

Structure of 7He by proton removal from 8Li with the (d, 3He) reaction

NUCLEAR REACTIONS 2H(8Li, 3He), E=76 MeV; 2H(7Li, t), (7Li, 3He), E=81 MeV; measured charged particle spectra, (particle)(particle)-coin, angular distributions, σ, σ(θ), spectroscopic factors. 7He; deduced levels, J, π. Comparisons with data from 2H(6He, p) experiment. Comparisons with nuclear structure models and variational quantum Monte Carlo calculations.

doi: 10.1103/PhysRevC.78.041302
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2007FR10      Phys.Rev. C 75, 051301 (2007)

S.J.Freeman, J.P.Schiffer, A.C.C.Villari, J.A.Clark, C.Deibel, S.Gros, A.Heinz, D.Hirata, C.L.Jiang, B.P.Kay, A.Parikh, P.D.Parker, J.Qian, K.E.Rehm, X.D.Tang, V.Werner, C.Wrede

Pair correlations in nuclei involved in neutrinoless double Β decay: 76Ge and 76Se

NUCLEAR REACTIONS 74,76Ge, 76,78Se(p, t), E=23 MeV; measured yields, cross sections and angular distributions. Compared results to DWBA calculations.

doi: 10.1103/PhysRevC.75.051301
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2007TA34      Phys.Rev.Lett. 99, 052502 (2007)

X.D.Tang, K.E.Rehm, I.Ahmad, C.R.Brune, A.Champagne, J.P.Greene, A.A.Hecht, D.Henderson, R.V.F.Janssens, C.L.Jiang, L.Jisonna, D.Kahl, E.F.Moore, M.Notani, R.C.Pardo, N.Patel, M.Paul, G.Savard, J.P.Schiffer, R.E.Segel, S.Sinha, B.Shumard, A.H.Wuosmaa

New Determination of the Astrophysical S Factor SE1 of the 12C(α, γ)16O Reaction

RADIOACTIVITY 16N(β-), (β-α); measured Eα, Iα, 12Cα-coin. 12C(α, γ); deduced astrophysical S-factor.

doi: 10.1103/PhysRevLett.99.052502
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2007WU05      Eur.Phys.J. Special Topics 150, 79 (2007)

A.H.Wuosmaa, K.E.Rehm, J.P.Greene, D.J.Henderson, R.V.F.Janssens, C.L.Jiang, L.Jisonna, J.C.Lighthall, S.T.Marley, E.F.Moore, R.C.Pardo, N.Patel, M.Paul, D.Peterson, S.C.Pieper, G.Savard, J.P.Schiffer, R.E.Segal, R.H.Siemssen, S.Sinha, X.Tang, R.B.Wiringa

Nucleon transfer reactions with exotic beams at ATLAS

doi: 10.1140/epjst/e2007-00271-y
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2006WI03      Phys.Rev. C 73, 025503 (2006)

W.T.Winter, S.J.Freedman, K.E.Rehm, J.P.Schiffer

The 8B neutrino spectrum

RADIOACTIVITY 8B(β+α) [from 3He(6Li, n)]; measured β-delayed Eα, αα-coin; deduced β+-decay strength function, neutrino spectrum.

doi: 10.1103/PhysRevC.73.025503
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2005AH02      Phys.Rev. C 71, 024311 (2005)

I.Ahmad, J.C.Banar, J.A.Becker, T.A.Bredeweg, J.R.Cooper, D.S.Gemmell, A.Kraemer, A.Mashayekhi, D.P.McNabb, G.G.Miller, E.F.Moore, P.Palmer, L.N.Pangault, R.S.Rundberg, J.P.Schiffer, S.D.Shastri, T.-F.Wang, J.B.Wilhelmy

Search for x-ray induced decay of the 31-yr isomer of 178Hf using synchrotron radiation

NUCLEAR REACTIONS 178mHf(X-ray, X), E=8-30 keV; measured prompt and delayed Eγ, X-ray spectra; deduced σ upper limit for induced isomer decay. Comparison with previous results.

doi: 10.1103/PhysRevC.71.024311
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2005LU11      Nucl.Phys. A754, 361c (2005)

Z.-T.Lu, R.J.Holt, P.Mueller, T.P.O'Connor, J.P.Schiffer, L.-B.Wang

Searches for stable strangelets in ordinary matter: overview and a recent example

doi: 10.1016/j.nuclphysa.2005.01.038
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2005WU03      Phys.Rev.Lett. 94, 082502 (2005)

A.H.Wuosmaa, K.E.Rehm, J.P.Greene, D.J.Henderson, R.V.F.Janssens, C.L.Jiang, L.Jisonna, E.F.Moore, R.C.Pardo, M.Paul, D.Peterson, S.C.Pieper, G.Savard, J.P.Schiffer, R.E.Segel, S.Sinha, X.Tang, R.B.Wiringa

Neutron Spectroscopic Factors in 9Li from 2H(8Li, p)9Li

NUCLEAR REACTIONS 2H(8Li, p), E ≈ 76 MeV; measured Ep, excitation energy spectra, σ(θ). 9Li deduced levels, J, π, spectroscopic factors. Comparison with model predictions.

doi: 10.1103/PhysRevLett.94.082502
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2005WU08      Phys.Rev. C 72, 061301 (2005)

A.H.Wuosmaa, K.E.Rehm, J.P.Greene, D.J.Henderson, R.V.F.Janssens, C.L.Jiang, L.Jisonna, E.F.Moore, R.C.Pardo, M.Paul, D.Peterson, Steven C.Pieper, G.Savard, J.P.Schiffer, R.E.Segel, S.Sinha, X.Tang, R.B.Wiringa

Search for excited states in 7He with the (d, p) reaction

NUCLEAR REACTIONS 2H(6He, p), E=69 MeV; 2H(7Li, p), E=81 MeV; measured particle spectra, σ(θ). 7He deduced ground-state J, π, excited state energy, width.

doi: 10.1103/PhysRevC.72.061301
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1407.


2004MU03      Phys.Rev.Lett. 92, 022501 (2004)

P.Mueller, L.-B.Wang, R.J.Holt, Z.-T.Lu, T.P.O'Connor, J.P.Schiffer

Search for Anomalously Heavy Isotopes of Helium in the Earth's Atmosphere

doi: 10.1103/PhysRevLett.92.022501
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2004RE31      Nucl.Phys. A746, 354c (2004)

K.E.Rehm, C.L.Jiang, J.P.Greene, D.Henderson, R.V.F.Janssens, E.F.Moore, G.Mukherjee, R.C.Pardo, T.Pennington, J.P.Schiffer, S.Sinha, X.D.Tang, R.H.Siemssen, L.Jisonna, R.E.Segel, A.H.Wuosmaa

First studies of the 8B(α, p)11C reaction

NUCLEAR REACTIONS 1H(11C, α), E=98-110 MeV; measured σ(θ). 8B(α, p), E*=8.7-9.8 MeV; deduced excitation function, astrophysical reaction rate.

doi: 10.1016/j.nuclphysa.2004.09.052
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1133.


2004SC16      Phys.Rev.Lett. 92, 162501 (2004); Erratum Phys.Rev.Lett. 110, 169901 (2013)

J.P.Schiffer, S.J.Freeman, J.A.Caggiano, C.Deibel, A.Heinz, C.-L.Jiang, R.Lewis, A.Parikh, P.D.Parker, K.E.Rehm, S.Sinha, J.S.Thomas

Is the Nuclear Spin-Orbit Interaction Changing with Neutron Excess?

NUCLEAR REACTIONS 112,114,116,118,120,122,124Sn(α, t), E=40 MeV; measured σ(E, θ). 113,115,117,119,121,123,125Sb levels deduced spectroscopic factors, decrease in nuclear spin-orbit interaction. Nuclides near N=82 also discussed.

doi: 10.1103/PhysRevLett.92.162501
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2004WA23      Phys.Rev.Lett. 93, 142501 (2004)

L.-B.Wang, P.Mueller, K.Bailey, G.W.F.Drake, J.P.Greene, D.Henderson, R.J.Holt, R.V.F.Janssens, C.L.Jiang, Z.-T.Lu, T.P.O'Connor, R.C.Pardo, K.E.Rehm, J.P.Schiffer, X.D.Tang

Laser Spectroscopic Determination of the 6He Nuclear Charge Radius

NUCLEAR MOMENTS 4,6He; measured isotope shift. 6He deduced charge radius. Laser spectroscopy.

doi: 10.1103/PhysRevLett.93.142501
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2004WI13      Nucl.Phys. A746, 311c (2004)

W.T.Winter, K.E.Rehm, C.L.Jiang, I.Ahmad, S.J.Freedman, J.Greene, A.Heinz, D.Henderson, R.V.F.Janssens, E.F.Moore, G.Mukherjee, R.C.Pardo, M.Paul, T.Pennington, G.Savard, J.P.Schiffer, D.Seweryniak, G.Zinkann

Determination of the 8B neutrino spectrum

RADIOACTIVITY 8B(EC); measured β-delayed Eα; deduced neutrino spectrum. 20Na(EC); measured β-delayed Eα.

doi: 10.1016/j.nuclphysa.2004.09.029
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2004WU07      Nucl.Phys. A746, 267c (2004)

A.H.Wuosmaa, T.Al Tahtamouni, J.P.Schiffer

A solenoidal transport device for transfer reactions in inverse kinematics

doi: 10.1016/j.nuclphysa.2004.09.039
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2003AH03      Phys.Rev. C 67, 041305 (2003)

I.Ahmad, J.C.Banar, J.A.Becker, T.A.Bredeweg, J.R.Cooper, D.S.Gemmell, A.Mashayekhi, D.P.McNabb, E.F.Moore, P.Palmer, R.S.Rundberg, J.P.Schiffer, S.D.Shastri, T.F.Wang, J.B.Wilhelmy

Search for x-ray induced decay of the 31-yr isomer of 178Hf at low x-ray energies

NUCLEAR REACTIONS 178mHf(X-ray, X), E=6-20 keV; measured upper limit for energy-integrated σ of x-ray induced isomer decay. Comparison with previous results.

doi: 10.1103/PhysRevC.67.041305
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2003DU23      Phys.Rev. C 68, 064603 (2003)

D.Dutta, D.van Westrum, D.Abbott, A.Ahmidouch, Ts.A.Amatuoni, C.Armstrong, J.Arrington, K.A.Assamagan, K.Bailey, O.K.Baker, S.Barrow, K.Beard, D.Beatty, S.Beedoe, E.Beise, E.Belz, C.Bochna, P.E.Bosted, H.Breuer, E.E.W.Bruins, R.Carlini, J.Cha, N.Chant, C.Cothran, W.J.Cummings, S.Danagoulian, D.Day, D.DeSchepper, J.-E.Ducret, F.Duncan, J.Dunne, T.Eden, R.Ent, H.T.Fortune, V.Frolov, D.F.Geesaman, H.Gao, R.Gilman, P.Gueye, J.O.Hansen, W.Hinton, R.J.Holt, C.Jackson, H.E.Jackson, C.Jones, S.Kaufmann, J.J.Kelly, C.Keppel, M.Khandaker, W.Kim, E.Kinney, A.Klein, D.Koltenuk, L.Kramer, W.Lorenzon, A.Lung, K.McFarlane, D.J.Mack, R.Madey, P.Markowitz, J.Martin, A.Mateos, D.Meekins, M.A.Miller, R.Milner, J.Mitchell, R.Mohring, H.Mkrtchyan, A.M.Nathan, G.Niculescu, I.Niculescu, T.G.O'Neill, D.Potterveld, J.W.Price, J.Reinhold, C.Salgado, J.P.Schiffer, R.E.Segel, P.Stoler, R.Suleiman, V.Tadevosyan, L.Tang, B.Terburg, T.P.Welch, C.Williamson, S.Wood, C.Yan, J.-C.Yang, J.Yu, B.Zeidman, W.Zhao, B.Zihlmann

Quasielastic (e, e'p) reaction on 12C, 56Fe, and 197Au

NUCLEAR REACTIONS 12C, 56Fe, 197Au(e, e'p), E=0.845-3.345 GeV; measured missing energy, momentum distributions; deduced spectral functions. Comparison with model predictions.

doi: 10.1103/PhysRevC.68.064603
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2003MU09      Nucl.Instrum.Methods Phys.Res. B204, 536 (2003)

P.Muller, L.-B.Wang, K.Bailey, G.W.F.Drake, X.Du, J.Greene, A.M.Heinz, R.J.Holt, D.Henderson, R.V.Janssens, C.-L.Jiang, C.Law, Z.-T.Lu, I.D.Moore, T.P.O'Connor, R.C.Pardo, M.Paul, T.Pennington, K.E.Rehm, J.P.Schiffer

Towards measuring the charge radius of 6He and 8He

RADIOACTIVITY 6He(β-) [from 12C(7Li, 6He)]; measured Eβ, T1/2. Magneto-optical trap for charge radius measurement.

doi: 10.1016/S0168-583X(02)02128-6
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2003RE16      Phys.Rev. C 67, 065809 (2003)

K.E.Rehm, A.H.Wuosmaa, C.L.Jiang, J.Caggiano, J.P.Greene, A.Heinz, D.Henderson, R.V.F.Janssens, E.F.Moore, G.Mukherjee, R.C.Pardo, T.Pennington, J.P.Schiffer, R.H.Siemssen, M.Paul, L.Jisonna, R.E.Segel

Branching ratio Γαγ of the 4.033 MeV 3/2+ state in 19Ne

NUCLEAR REACTIONS 3He(20Ne, α), E ≈ 98 MeV; measured particle spectra, yields, (particle)(recoil)-coin; deduced excitation energy spectra. 19Ne levels deduced α-decay branching widths. 15O(α, γ), E=low; deduced astrophysical reaction rates.

doi: 10.1103/PhysRevC.67.065809
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1487.


2003RE25      Nucl.Phys. A718, 151c (2003)

K.E.Rehm, A.H.Wuosmaa, C.L.Jiang, J.Greene, A.Heinz, D.Henderson, R.V.F.Janssens, L.Jisonna, E.F.Moore, G.Mukherjee, R.C.Pardo, M.Paul, T.Pennington, J.P.Schiffer, R.E.Segel, R.H.Siemssen

The Branching Ratio Γαγ of the 4.033 MeV State in 19Ne

NUCLEAR REACTIONS 3He(20Ne, α), E=105 MeV; measured particle spectra, (particle)(recoil)-coin. 19Ne levels deduced α-branching ratios, radiative widths. 15O(α, γ), E=low; deduced astrophysical reaction rates.

doi: 10.1016/S0375-9474(03)00706-1
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2003RE26      Nucl.Phys. A718, 443c (2003)

K.E.Rehm, W.Winter, C.L.Jiang, I.Ahmad, S.J.Freedman, J.Greene, A.Heinz, D.Henderson, R.V.F.Janssens, E.F.Moore, G.Mukherjee, R.C.Pardo, M.Paul, T.Pennington, G.Savard, J.P.Schiffer, D.Seweryniak, G.Zinkann

Study of the 8B Neutrino Spectrum With a New Technique

RADIOACTIVITY 8B, 20Na(α) [from 3He(6Li, n), (19F, 2n)]; measured Eα.

doi: 10.1016/S0375-9474(03)00841-8
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2003WI11      Nucl.Phys. A721, 553c (2003)

W.Winter, K.E.Rehm, C.L.Jiang, I.Ahmad, S.J.Freedman, J.Greene, A.Heinz, D.Henderson, R.V.F.Janssens, E.F.Moore, G.Mukherjee, R.C.Pardo, M.Paul, T.Pennington, G.Savard, J.P.Schiffer, D.Seweryniak, G.Zinkann

Measurement of the 8B Neutrino Spectrum

RADIOACTIVITY 8B, 20Na(β+), (EC) [from 3He(6Li, n) and 3He(19F, 2n)]; measured β-delayed Eα. Mass-separated sources.

doi: 10.1016/S0375-9474(03)01122-9
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2003WI16      Phys.Rev.Lett. 91, 252501 (2003)

W.T.Winter, S.J.Freedman, K.E.Rehm, I.Ahmad, J.P.Greene, A.Heinz, D.Henderson, R.V.F.Janssens, C.L.Jiang, E.F.Moore, G.Mukherjee, R.C.Pardo, T.Pennington, G.Savard, J.P.Schiffer, D.Seweryniak, G.Zinkann, M.Paul

Determination of the 8B Neutrino Spectrum

RADIOACTIVITY 8B, 20Na(β+α) [from 3He(6Li, n) and 3He(19F, 2n)]; measured β-delayed Eα, Iα, βα-coin; deduced neutrino spectrum. Comparison with previous results.

doi: 10.1103/PhysRevLett.91.252501
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2002HA15      Phys.Rev. C65, 035803 (2002)

B.Harss, C.L.Jiang, K.E.Rehm, J.P.Schiffer, J.Caggiano, P.Collon, J.P.Greene, D.Henderson, A.Heinz, R.V.F.Janssens, J.Nolen, R.C.Pardo, T.Pennington, R.H.Siemssen, A.A.Sonzogni, J.Uusitalo, I.Wiedenhover, M.Paul, T.F.Wang, F.Borasi, R.E.Segel, J.C.Blackmon, M.Smith, A.Chen, P.Parker

Widths of Astrophysically Important Resonances in 18Ne

NUCLEAR REACTIONS 1H(17F, p), (17F, α), E(cm)=3.07-3.94 MeV; measured σ, σ(E, θ). 17F(p, p'), E(cm) ≈ 3.5 MeV; deduced σ(θ). 14O(α, p), E=low; deduced astrophysical reaction rates. 18Ne deduced resonance parameters.

doi: 10.1103/PhysRevC.65.035803
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2002JI08      Nucl.Instrum.Methods Phys.Res. A492, 57 (2002)

C.L.Jiang, B.B.Back, I.Gomes, A.M.Heinz, J.Nolen, K.E.Rehm, G.Savard, J.P.Schiffer

Yield calculations for a facility for short-lived nuclear beams

NUCLEAR REACTIONS 7Li(86Kr, X)78Ni, E ≈ 0.1-1 GeV/nucleon; 9Be(40Ar, X)19C, E ≈ 0.1-1 GeV/nucleon; calculated yields vs target thickness. Yields for many other reactions discussed.

doi: 10.1016/S0168-9002(02)01352-9
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2002RE29      Phys.Rev.Lett. 89, 132501 (2002)

K.E.Rehm, C.L.Jiang, I.Ahmad, J.Caggiano, P.Collon, J.P.Greene, D.Henderson, A.Heinz, R.V.F.Janssens, R.C.Pardo, T.Pennington, J.P.Schiffer, R.H.Siemssen, A.H.Wuosmaa, M.Paul, P.Mohr

Large Angle Elastic Alpha Scattering on a N = Z Nucleus above A = 40

NUCLEAR REACTIONS 4He(44Ti, 44Ti), (44Ti, 44Ti'), (40Ca, 40Ca), E(cm)=21.8 MeV; measured σ(θ); deduced angle-integrated σ, optical model parameters.

doi: 10.1103/PhysRevLett.89.132501
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1652.


2001AH04      Phys.Rev.Lett. 87, 072503 (2001)

I.Ahmad, J.C.Banar, J.A.Becker, D.S.Gemmell, A.Kraemer, A.Mashayekhi, D.P.McNabb, G.G.Miller, E.F.Moore, L.N.Pangault, R.S.Rundberg, J.P.Schiffer, S.D.Shastri, T.F.Wang, J.B.Wilhelmy

Search for X-Ray Induced Acceleration of the Decay of the 31-Yr Isomer of 178Hf using Synchrotron Radiation

NUCLEAR REACTIONS 178mHf(X-ray, γ), E ≈ 10-100 keV; measured prompt and delayed Eγ, Iγ, x-ray spectra; deduced upper limit on energy-integrated σ for enhanced isomer decay.

doi: 10.1103/PhysRevLett.87.072503
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2001RE09      Nucl.Phys. A684, 470c (2001)

J.Reinhold, D.Abbott, A.Ahmidouch, P.Ambrozewicz, C.S.Armstrong, J.Arrington, R.Asaturyan, K.Assamagan, S.Avery, K.Bailey, O.K.Baker, S.Beedoe, H.Bitao, W.Boeglin, H.Breuer, D.S.Brown, R.Carlini, J.Cha, N.Chant, E.Christy, A.Cochran, L.Cole, G.Collins, C.Cothran, J.Crowder, W.J.Cummings, S.Danagoulian, F.Dohrmann, F.Duncan, J.Dunne, D.Dutta, T.Eden, M.Elaasar, R.Ent, L.Ewell, H.Fenker, H.T.Fortune, Y.Fujii, L.Gan, H.Gao, K.Garrow, D.F.Geesaman, P.Gueye, K.Gustafsson, K.Hafidi, J.O.Hansen, W.Hinton, H.E.Jackson, H.Juengst, C.Keppel, A.Klein, D.Koltenuk, Y.Liang, J.H.Liu, A.Lung, D.Mack, R.Madey, P.Markowitz, C.J.Martoff, D.Meekins, J.Mitchell, T.Miyoshi, H.Mkrtchyan, R.Mohring, S.K.Mtingwa, B.Mueller, T.G.O'Neill, G.Niculescu, I.Niculescu, D.Potterveld, J.W.Price, B.A.Raue, P.E.Reimer, J.Roche, P.Roos, M.Sarsour, Y.Sato, G.Savage, R.Sawafta, J.P.Schiffer, R.E.Segel, A.Semenov, S.Stepanyan, V.Tadevosian, S.Tajima, L.Tang, B.Terburg, A.Uzzle, S.Wood, H.Yamaguchi, C.Yan, C.Yan, L.Yuan, B.Zeidman, M.Zeier, B.Zihlmann

Electroproduction of Kaons and Light Hypernuclei

NUCLEAR REACTIONS 2H, 3,4He(e, e'K+), E=3.245 MeV; measured hyperon production associated missing mass spectra. Comparison with Monte Carlo simulations.

doi: 10.1016/S0375-9474(01)00509-7
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2001ZE06      Nucl.Phys. A691, 37c (2001)

B.Zeidman, D.Abbott, A.Ahmidouch, P.Ambrozewicz, C.S.Armstrong, J.Arrington, R.Asaturyan, K.Assamagan, S.Avery, K.Bailey, O.K.Baker, S.Beedoe, H.Bitao, H.Breuer, D.S.Brown, R.Carlini, J.Cha, N.Chant, E.Christy, A.Cochran, L.Cole, G.Collins, C.Cothran, J.Crowder, W.J.Cummings, S.Danagoulian, F.Dohrmann, F.Duncan, J.Dunne, D.Dutta, T.Eden, M.Elaasar, R.Ent, L.Ewell, H.Fenker, H.T.Fortune, Y.Fujii, L.Gan, H.Gao, K.Garrow, D.Y.Geesaman, P.Gueye, K.Gustafsson, K.Hafidi, J.O.Hansen, W.Hinton, H.E.Jackson, H.Juengst, C.Keppel, A.Klein, D.Koltenuk, Y.Liang, J.H.Liu, A.Lung, D.Mack, R.Madey, P.Markowitz, C.J.Martoff, D.Meekins, J.Mitchell, T.Miyoshi, H.Mkrtchyan, R.Mohring, S.K.Mtingwa, B.Mueller, T.G.O'Neill, G.Niculescu, I.Niculescu, D.Potterveld, J.W.Price, B.A.Raue, P.E.Reimer, J.Reinhold, J.Roche, P.Roos, M.Sarsour, Y.Sato, G.Savage, R.Sawafta, J.P.Schiffer, R.E.Segel, A.Semenov, S.Stepanyan, V.Tadevosian, S.Tajima, L.Tang, B.Terburg, A.Uzzle, S.Wood, H.Yamaguchi, C.Yan, C.Yan, L.Yuan, M.Zeier, B.Zihlmann

Electroproduction of Kaons on Light Nuclei

NUCLEAR REACTIONS 1,2H, 3,4He(e, e'K+), E=3.245 GeV; measured hyperon production associated missing mass spectra; deduced possible hypernucleus bound states. Comparisons with model predictions.

doi: 10.1016/S0375-9474(01)00999-X
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2000DU12      Phys.Rev. C61, 061602 (2000)

D.Dutta, D.van Westrum, D.Abbott, A.Ahmidouch, Ts.A.Amatuni, C.Armstrong, J.Arrington, K.A.Assamagan, K.Bailey, O.K.Baker, S.Barrow, K.Beard, D.Beatty, S.Beedoe, E.Beise, J.E.Belz, C.Bochna, P.E.Bosted, H.Breuer, E.E.W.Bruins, R.Carlini, J.Cha, N.Chant, R.E.Chrien, C.Cothran, W.J.Cummings, S.Danagoulian, D.Day, D.DeSchepper, J.-E.Ducret, F.Duncan, J.Dunne, T.Eden, R.Ent, H.T.Fortune, V.Frolov, D.F.Geesaman, H.Gao, R.Gilman, P.Gueye, J.O.Hansen, W.Hinton, R.J.Holt, C.Jackson, H.E.Jackson, C.Jones, S.Kaufman, J.J.Kelly, C.Keppel, M.Khandaker, W.Kim, E.Kinney, A.Klein, D.Koltenuk, L.Kramer, W.Lorenzon, K.McFarlane, D.J.Mack, R.Madey, P.Markowitz, J.Martin, A.Mateos, D.Meekins, E.Meier, M.A.Miller, R.Milner, J.Mitchell, R.Mohring, H.Mkrtchyan, A.M.Nathan, G.Niculescu, I.Niculescu, T.G.O'Neill, D.Potterveld, J.W.Price, J.Reinhold, C.Salgado, J.P.Schiffer, R.E.Segel, P.Stoler, R.Suleiman, R.Sawafta, R.J.Sutter, V.Tadevosyan, L.Tang, B.Terburg, T.P.Welch, C.Williamson, S.Wood, C.Yan, J.-C.Yang, J.Yu, B.Zeidman, W.Zhao, B.Zihlmann

Separated Spectral Functions for the Quasifree 12C(e, e'p) Reaction

NUCLEAR REACTIONS 12C(e, e'p), E=0.845-3.245 GeV; measured transverse and longitudinal spectral functions vs proton energy; deduced momentum transfer dependence, role of multinucleon processes.

doi: 10.1103/PhysRevC.61.061602
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2000RE11      Nucl.Instrum.Methods Phys.Res. A449, 208 (2000)

K.E.Rehm, F.Borasi, C.J.Jiang, D.Ackermann, I.Ahmad, F.Brumwell, C.N.Davids, P.Decrock, S.M.Fischer, J.Gorres, J.P.Greene, G.Hackmann, B.Harss, D.Henderson, W.Henning, R.V.F.Janssens, G.McMichael, V.Nanal, D.Nisius, J.Nolen, R.C.Pardo, M.Paul, P.Reiter, J.P.Schiffer, D.Seweryniak, R.E.Segel, I.Wiedenhover, M.Wiescher, A.H.Wuosmaa

Experiments with a Radioactive 56Ni Beam

NUCLEAR REACTIONS 63,65Cu, 58Ni(p, X), E=50 MeV; measured delayed Eγ, Iγ; deduced evidence for 56Ni, 56,57Co, 52Mn, 65Zn. 2H(28Si, 29Si), E=125 MeV; 2H(56Co, 57Co), E=250 MeV; measured σ(Ep, θ). 57Co levels deduced spectroscopic factors.

doi: 10.1016/S0168-9002(99)01439-4
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2000SO01      Phys.Rev.Lett. 84, 1651 (2000)

A.A.Sonzogni, K.E.Rehm, I.Ahmad, F.Borasi, D.L.Bowers, F.Brumwell, J.Caggiano, C.N.Davids, J.P.Greene, B.Harss, A.Heinz, D.Henderson, R.V.F.Janssens, C.L.Jiang, G.McMichael, J.Nolen, R.C.Pardo, M.Paul, J.P.Schiffer, R.E.Segel, D.Seweryniak, R.H.Siemssen, J.W.Truran, J.Uusitalo, I.Wiedenhover, B.Zabransky

The 44Ti(α, p) Reaction and Its Implication on the 44Ti Yield in Supernovae

NUCLEAR REACTIONS 44Ti(α, p), E(cm)=5.7-9 MeV; measured σ, astrophysical reaction rate. Comparison with statistical model calculations. Effects on the production of 44Ti in core-collapsed supernovae discussed.

doi: 10.1103/PhysRevLett.84.1651
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0609.


1999AH07      Phys.Rev. C60, 064601 (1999)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, C.M.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, Th.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.M.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, A.R.Young, J.E.Yurkon

Positron-Electron Pairs Produced in Heavy-Ion Collisions

NUCLEAR REACTIONS 232Th(238U, X), E=5.95 MeV/nucleon; 181Ta(238U, X), E=5.95, 6.1, 6.3 MeV/nucleon; measured positron, electron spectra, multiplicities, e-e+-coin, angular correlation; deduced no sharp structure in sum-energy spectra. APEX spectrometer.

doi: 10.1103/PhysRevC.60.064601
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1999HA14      Phys.Rev.Lett. 82, 3964 (1999); Comment Phys.Rev.Lett. 84, 1635 (2000)

B.Harss, J.P.Greene, D.Henderson, R.V.F.Janssens, C.L.Jiang, J.Nolen, R.C.Pardo, K.E.Rehm, J.P.Schiffer, R.H.Siemssen, A.A.Sonzogni, J.Uusitalo, I.Wiedenhover, M.Paul, T.F.Wang, F.Borasi, R.E.Segel, J.C.Blackmon, M.S.Smith, A.Chen, P.Parker

Stellar Reactions with Short-Lived Nuclei: 17F(p, α)14O

NUCLEAR REACTIONS 1H(17F, 14O), E(cm)=2.2-3.8 MeV; measured particle energies, (14O)α-coin, σ(E). 18Ne deduced resonance parameters. Implications for astrophysical processes discussed.

doi: 10.1103/PhysRevLett.82.3964
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1999HE04      Rev.Mod.Phys. 71, S205 (1999)

E.M.Henley, J.P.Schiffer

Nuclear Physics at the End of the Century

doi: 10.1103/RevModPhys.71.S205
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1998AB18      Phys.Rev.Lett. 80, 5072 (1998)

D.Abbott, A.Ahmidouch, Ts.A.Amatuni, C.Armstrong, J.Arrington, K.A.Assamagan, K.Bailey, O.K.Baker, S.Barrow, K.Beard, D.Beatty, S.Beedoe, E.Beise, J.E.Belz, C.Bochna, H.Breuer, E.E.W.Bruins, R.Carlini, J.Cha, N.Chant, C.Cothran, W.J.Cummings, S.Danagoulian, D.Day, D.DeSchepper, J.-E.Ducret, F.Duncan, J.Dunne, D.Dutta, T.Eden, R.Ent, H.T.Fortune, V.Frolov, D.F.Geesaman, H.Gao, R.Gilman, P.Gueye, J.O.Hansen, W.Hinton, R.J.Holt, C.Jackson, H.E.Jackson, C.E.Jones, S.Kaufman, J.J.Kelly, C.Keppel, M.Khandaker, W.Kim, E.Kinney, A.Klein, D.Koltenuk, L.Kramer, W.Lorenzon, K.McFarlane, D.J.Mack, R.Madey, P.Markowitz, J.Martin, A.Mateos, D.Meekins, M.A.Miller, R.Milner, J.Mitchell, R.Mohring, H.Mkrtchyan, A.M.Nathan, G.Niculescu, I.Niculescu, T.G.O'Neill, D.Potterveld, J.W.Price, J.Reinhold, C.Salgado, J.P.Schiffer, R.E.Segel, P.Stoler, R.Suleiman, V.Tadevosyan, L.Tang, B.Terburg, D.van Westrum, P.Welch, C.Williamson, S.Wood, C.Yan, J.-C.Yang, J.Yu, B.Zeidman, W.Zhao, B.Zihlmann

Quasifree (e, e'p) Reactions and Proton Propagation in Nuclei

NUCLEAR REACTIONS C, Fe, 197Au(e, e'p), E=2.45, 3.25 GeV; measured σ(θ), σ(Q2); deduced nuclear medium effects.

doi: 10.1103/PhysRevLett.80.5072
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1998JI04      Phys.Rev. C57, 2393 (1998)

C.L.Jiang, K.E.Rehm, H.Esbensen, D.J.Blumenthal, B.Crowell, J.Gehring, B.Glagola, J.P.Schiffer, A.H.Wuosmaa

Multineutron Transfer in 58Ni + 124Sn Collisions at Sub-Barrier Energies

NUCLEAR REACTIONS, ICPND 58Ni(124Sn, X)58Ni/59Ni/60Ni/61Ni/62Ni/63Ni/64Ni/65Ni/57Co/56Fe, E=480-512 MeV; measured σ(θ), σ; deduced neutron transfer probabilities, Q-values.

doi: 10.1103/PhysRevC.57.2393
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1998RE01      Phys.Rev.Lett. 80, 676 (1998)

K.E.Rehm, F.Borasi, C.L.Jiang, D.Ackermann, I.Ahmad, B.A.Brown, F.Brumwell, C.N.Davids, P.Decrock, S.M.Fischer, J.Gorres, J.Greene, G.Hackmann, B.Harss, D.Henderson, W.Henning, R.V.F.Janssens, G.McMichael, V.Nanal, D.Nisius, J.Nolen, R.C.Pardo, M.Paul, P.Reiter, J.P.Schiffer, D.Seweryniak, R.E.Segel, M.Wiescher, A.H.Wuosmaa

Study of the 56Ni(d, p)57Ni Reaction and the Astrophysical 56Ni(p, γ)57Cu Reaction Rate

NUCLEAR REACTIONS 2H(56Ni, p), E=250 MeV; measured σ(Ep, θ). 57Ni deduced levels, J, π, spectroscopic factors, astrophysical (p, γ) reaction rates.

doi: 10.1103/PhysRevLett.80.676
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1998RE24      Nucl.Instrum.Methods Phys.Res. A418, 355 (1998)

K.E.Rehm, C.L.Jiang, M.Paul, D.Blumenthal, L.A.Daniel, C.N.Davids, P.Decrock, S.M.Fischer, D.Henderson, C.Lister, J.Nickles, J.Nolen, R.C.Pardo, J.P.Schiffer, D.Seweryniak, R.E.Segel

Study of Radiative Capture Reactions with Radioactive Ion Beams

NUCLEAR REACTIONS 1H(18F, 19Ne), E=13.4 MeV; measured σ upper limit. 18F(p, γ), E(cm)=670 keV; deduced σ upper limit. Radioactive beams, inverse kinematics, fragment mass analyzer.

doi: 10.1016/S0168-9002(98)00885-7
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1998WU01      Phys.Rev.Lett. 80, 2085 (1998)

A.H.Wuosmaa, I.Ahmad, S.M.Fischer, J.P.Greene, G.Hackman, V.Nanal, G.Savard, J.P.Schiffer, P.Wilt, S.M.Austin, B.A.Brown, S.J.Freedman, J.J.Connell

β+ Decay Partial Half-Life of 54Mn and Cosmic Ray Chronometry

RADIOACTIVITY 54Mn(β+); measured β+ spectra, β+-decay branching ratio, partial T1/2. Astrophysical implications.

doi: 10.1103/PhysRevLett.80.2085
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1998WU02      Phys.Rev. C57, R2794 (1998)

A.H.Wuosmaa, C.M.Conner, I.Ahmad, B.B.Back, R.R.Betts, R.W.Dunford, S.M.Fischer, R.Ganz, J.P.Greene, N.I.Kaloskamis, L.Lamm, C.J.Lister, V.Nanal, D.E.Roa, J.P.Schiffer

Positron-Electron Angular Correlations in Internal Pair Conversion

RADIOACTIVITY 90Y(β-); 206,207Bi(EC); measured e+e--coin, sum energy spectra, opening angle correlations from internal pair conversion in daughter nuclei. 90Zr, 206,207Pb deduced transitions internal pair conversion coefficients.

doi: 10.1103/PhysRevC.57.R2794
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1997AH01      Phys.Rev.Lett. 78, 618 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.R.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Search for Monoenergetic Positron Emission from Heavy-Ion Collisions at Coulomb-Barrier Energies

NUCLEAR REACTIONS 181Ta(238U, X), E=5.95-6.3 MeV/nucleon; 232Th(238U, X), E=5.95 MeV/nucleon; measured positron energy spectra; deduced no structure.

doi: 10.1103/PhysRevLett.78.618
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1997AH04      Phys.Rev. C55, R2755 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.A.Chishti, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, J.S.Greenberg, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Internal Pair Conversion in Heavy Nuclei

NUCLEAR REACTIONS 206Pb(206Pb, X), E=5.90 MeV/nucleon; measured e+e--sum energy spectra, Doppler corrected Eγ; deduced internal pair conversion to gamma branching ratio. 232Th(208Pb, X), E=5.80 MeV/nucleon; 238U(208Pb, X), E=5.80 MeV/nucleon; 181Ta(238U, X), E=5.95 MeV/nucleon; 232Th(238U, X), E=5.90 MeV/nucleon; measured e+e--sum energy, Doppler corrected Eγ; deduced no discrete lines evidence in e+e- spectra. 238U deduced new levels evidence.

doi: 10.1103/PhysRevC.55.R2755
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1997AH05      Z.Phys. A358, 235 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, A.Young, J.E.Yurkon, and the APEX Collaboration

The Positron-Electron Peak Puzzle: Results from APEX

NUCLEAR REACTIONS 232Th(238U, X), E=5.78-5.95 MeV/nucleon; 181Ta(238U, X), E=5.79-6.3 MeV/nucleon; measured total (e+)(heavy-ion)-, (e+e-)(heavy-ion)-coin events number; deduced very low light neutral particle production upper limits.

doi: 10.1007/s002180050316
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1997GE03      Phys.Rev. C55, 2959 (1997)

J.Gehring, B.B.Back, K.C.Chan, M.Freer, D.Henderson, C.L.Jiang, K.E.Rehm, J.P.Schiffer, M.Wolanski, A.H.Wuosmaa

Deep-Inelastic Scattering in 124,136Xe + 58,64Ni at Energies Near the Coulomb Barrier

NUCLEAR REACTIONS 58,64Ni(124Xe, X), E=522-556 MeV; 56,64Ni(136Xe, X), E=522-556 MeV; σ(θ), fragment E, mass; deduced deep inelastic σ. Modified extra push model.

doi: 10.1103/PhysRevC.55.2959
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1997RE02      Phys.Rev. C55, R566 (1997)

K.E.Rehm, C.L.Jiang, M.Paul, D.Blumenthal, L.A.Daniel, C.N.Davids, P.Decrock, S.M.Fischer, D.Henderson, C.Lister, J.Nickles, J.Nolen, R.C.Pardo, J.P.Schiffer, D.Seweryniak, R.E.Segel

Exploring the 18F(p, γ)19Ne Gateway to the Formation of Heavy Elements in Hot Stars

NUCLEAR REACTIONS, ICPND 18F(p, γ)19Ne, E=13.4 MeV; measured σ. 18O(p, γ)19F, E=14.4-18 MeV; measured σ; calculated σ(E); deduced 19Ne production, astrophysical reaction rate for 18F(p, γ)19Ne upper limits. 19Ne level deduced upper limit for Γγ.

doi: 10.1103/PhysRevC.55.R566
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1997RE05      Nucl.Phys. A616, 115c (1997)

K.E.Rehm, M.Paul, A.D.Roberts, C.L.Jiang, D.Blumenthal, C.N.Davids, P.DeCrock, S.M.Fischer, J.Gehring, D.Henderson, C.J.Lister, J.Nickles, J.Nolen, R.C.Pardo, J.P.Schiffer, R.E.Segel

Nuclear Reaction Studies with Radioactive 18F Beams at ATLAS

NUCLEAR REACTIONS, ICPND 1H(18F, α), E(cm) ≈ 5.75-7 MeV; measured σ(E). 1H(18F, γ), E(cm)=0.67 MeV; measured σ; deduced reaction rates ratio, small contribution from (p, γ) route to 19Ne formation.

doi: 10.1016/S0375-9474(97)00080-8
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1997RE17      Nucl.Phys. A621, 191c (1997)

K.E.Rehm, M.Paul, A.D.Roberts, C.L.Jiang, D.Blumenthal, C.N.Davids, P.DeCrock, S.M.Fischer, J.Gehring, D.Henderson, C.J.Lister, J.Nickles, J.Nolen, R.C.Pardo, J.P.Schiffer, R.E.Segel, D.Seweryniak

The Influence of 18F Induced Reactions in the Hot CNO Cycle

NUCLEAR REACTIONS, ICPND 1H(18F, 15O), (18F, 19Ne), E=11.7-15.1 MeV; measured resonance reaction σ vs E; deduced reaction rates features. 19Ne deduced resonance strengths, widths. Astrophysical implications, radioactive beam.

doi: 10.1016/S0375-9474(97)00236-4
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1996AH05      Acta Phys.Pol. B27, 387 (1996)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.Gazes, A.L.Hallin, T.Happ, N.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, A.Young, J.E.Yurkon, and the APEX Collaboration

The Positron Peak Puzzle - Recent Results from APEX

NUCLEAR REACTIONS 232Th(238U, X), E=5.95 MeV/nucleon; 181Ta(238U, X), E=5.96-6.3 MeV/nucleon; 206Pb(206Pb, X), E not given; analyzed e+e--sum energy spectra. 232Th, 238U(208Pb, X), E=5.8 MeV/nucleon; 232Th, 181Ta(238U, X), E=5.95 MeV/nucleon; 206Pb(206Pb, X), E=5.9 MeV/nucleon; analyzed Doppler reconstructed γ spectra; deduced limits on 1.78 MeV 238U transition possible contribution to (heavy ion)γ-coin.


1996AH07      Nucl.Instrum.Methods Phys.Res. A370, 539 (1996)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, J.S.Greenberg, J.P.Greene, A.L.Hallin, Th.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.M.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.R.Young, J.E.Yurkon

A Solenoidal Spectrometer for Positron-Electron Pairs Produced in Heavy-Ion Collisions

RADIOACTIVITY 85Sr(EC); 113Sn(EC); 203Hg(β-); measured electron spectra; deduced apparatus response, efficiency. New solenoidal spectrometer.

NUCLEAR REACTIONS 181Ta(238U, X), E=6.1 MeV/nucleon; measured γ-, positron energy spectra. New solenoidal spectrometer.

doi: 10.1016/0168-9002(95)00829-2
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1996RE05      Phys.Rev. C53, 1950 (1996)

K.E.Rehm, M.Paul, A.D.Roberts, C.L.Jiang, D.J.Blumenthal, S.M.Fischer, J.Gehring, D.Henderson, J.Nickles, J.Nolen, R.C.Pardo, J.P.Schiffer, R.E.Segel

Astrophysical Reaction Rate for the 18F(p, α)15O Reaction

NUCLEAR REACTIONS, ICPND 18F(p, α), E(cm)=600-800 keV; measured σ(E), resonance yield; calculated reaction rate. 19Ne deduced resonance, J, π, Γp, Γα, Γ.

doi: 10.1103/PhysRevC.53.1950
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1996SC44      Hyperfine Interactions 103, 71 (1996)

J.P.Schiffer

Order in Very Cold Confined Plasmas

doi: 10.1007/BF02317344
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1995AH01      Nucl.Phys. A583, 247c (1995)

I.Ahmad, S.M.Austin, B.B.Back, D.Bazin, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, J.S.Greenberg, A.L.Hallin, T.Happ, J.Last, N.Kaloskamis, E.Kashy, W.Kutschera, C.J.Lister, M.Liu, M.R.Maier, D.Mercer, A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon

Positron Production in Heavy Ion Collisions: Current status of the problem

NUCLEAR REACTIONS 181Ta(238U, X), E=5.9-6.3 MeV/nucleon; compiled, analyzed, reviewed electron, positron production data.

doi: 10.1016/0375-9474(94)00667-C
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1995AH06      Phys.Rev.Lett. 75, 2658 (1995)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Search for Narrow Sum-Energy Lines in Electron-Positron Pair Emission from Heavy-Ion Collisions Near the Coulomb Barrier

NUCLEAR REACTIONS 181Ta(238U, X), E=5.95-6.3 MeV/nucleon; 232Th(238U, X), E=5.95 MeV/nucleon; measured pair emission sum spectra; deduced no sharp lines evidence, neutral particle isolated decay related features.

doi: 10.1103/PhysRevLett.75.2658
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