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NSR database version of March 18, 2024.

Search: Author = A.Lennarz

Found 45 matches.

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2024PA09      Phys.Rev. C 109, 015802 (2024)

S.N.Paneru, C.R.Brune, D.Connolly, D.Odell, M.Poudel, D.R.Phillips, J.Karpesky, B.Davids, C.Ruiz, A.Lennarz, U.Greife, M.Alcorta, R.Giri, M.Lovely, M.Bowry, M.Delgado, N.E.Esker, A.B.Garnsworthy, C.Seeman, P.Machule, J.Fallis, A.A.Chen, F.Laddaran, A.Firmino, C.Weinerman

Elastic scattering of 3He+4He with the SONIK scattering chamber

doi: 10.1103/PhysRevC.109.015802
Citations: PlumX Metrics


2023DI06      Eur.Phys.J. A 59, 105 (2023)

I.Dillmann, O.Kester, R.Baartman, A.Chen, T.Junginger, F.Herwig, D.Kaltchev, A.Lennarz, T.Planche, C.Ruiz, N.Vassh

Measuring neutron capture cross sections of radioactive nuclei

doi: 10.1140/epja/s10050-023-01012-9
Citations: PlumX Metrics


2023WI02      Phys.Rev. C 107, 035803 (2023)

M.Williams, B.Davids, G.Lotay, N.Nishimura, T.Rauscher, S.A.Gillespie, M.Alcorta, A.M.Amthor, G.C.Ball, S.S.Bhattacharjee, V.Bildstein, W.N.Catford, D.T.Doherty, N.E.Esker, A.B.Garnsworthy, G.Hackman, K.Hudson, A.Lennarz, C.Natzke, B.Olaizola, A.Psaltis, C.E.Svensson, J.Williams, D.Walter, D.Yates

Cross sections of the 83Rb(p, γ)84Sr and 84Kr(p, γ)85Rb reactions at energies characteristic of the astrophysical γ process

NUCLEAR REACTIONS 1H(83Rb, γ)84Sr, E=2.4, 2.7 MeV/nucleon; 1H(84Kr, γ)85Rb, E=2.7 MeV/nucleon; measured Eγ, Iγ, (recoil)γ-coin; deduced σ(E). 1H(83Rb, γ)84Sr, E=2.4, 2.7 MeV/nucleon; deduced thermonuclear reaction rate. Comparison to SMARAGD and NON-SMOKER calculations. Relevance to the abundance of 84Sr produced during the γ process in supernovae. The EMMA recoil mass spectrometer with 12 Compton-suppressed HPGe detectors of the TIGRESS array at ISAC-II facility of TRIUMF.

doi: 10.1103/PhysRevC.107.035803
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2022AL01      J.Phys.(London) G49, 010501 (2022)

M.Aliotta, R.Buompane, M.Couder, A.Couture, R.J.deBoer, A.Formicola, L.Gialanella, J.Glorius, G.Imbriani, M.Junker, C.Langer, A.Lennarz, Y.A.Litvinov, W.-P.Liu, M.Lugaro, C.Matei, Z.Meisel, L.Piersanti, R.Reifarth, D.Robertson, A.Simon, O.Straniero, A.Tumino, M.Wiescher, Y.Xu

The status and future of direct nuclear reaction measurements for stellar burning

NUCLEAR REACTIONS 12C(α, γ), 22Ne(α, n), (α, γ), 12C(12C, X), E(cm)<7 MeV; analyzed available data; deduced σ, S-factors.

doi: 10.1088/1361-6471/ac2b0f
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2022LO01      Phys.Rev.Lett. 128, 042701 (2022)

G.Lotay, A.Lennarz, C.Ruiz, C.Akers, A.A.Chen, G.Christian, D.Connolly, B.Davids, T.Davinson, J.Fallis, D.A.Hutcheon, P.Machule, L.Martin, D.J.Mountford, A.St.J.Murphy

Radiative Capture on Nuclear Isomers: Direct Measurement of the 26mAl(p, γ)27Si Reaction

NUCLEAR REACTIONS 1H(26Al, γ), E=390 keV/nucleon; measured reaction products, Eγ, Iγ; deduced resonance energies and parameters, astrophysical reaction rates. Comparison with available data.

doi: 10.1103/PhysRevLett.128.042701
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2724. Data from this article have been entered in the XUNDL database. For more information, click here.


2022PS02      Phys.Rev.Lett. 129, 162701 (2022)

A.Psaltis, A.A.Chen, R.Longland, D.S.Connolly, C.R.Brune, B.Davids, J.Fallis, R.Giri, U.Greife, D.A.Hutcheon, L.Kroll, A.Lennarz, J.Liang, M.Lovely, M.Luo, C.Marshall, S.N.Paneru, A.Parikh, C.Ruiz, A.C.Shotter, M.Williams

Direct Measurement of Resonances in 7Be(α, γ)11C Relevant to νp-Process Nucleosynthesis

NUCLEAR REACTIONS 4He(7Be, γ)11C, E not given; measured reaction products, Eγ, Iγ; deduced resonance energies and strengths, thermonuclear reaction rates. Comparison with available data. DRAGON recoil separator, TRIUMF.

doi: 10.1103/PhysRevLett.129.162701
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022PS03      Phys.Rev. C 106, 045805 (2022)

A.Psaltis, A.A.Chen, R.Longland, D.S.Connolly, C.R.Brune, B.Davids, J.Fallis, R.Giri, U.Greife, D.A.Hutcheon, L.Kroll, A.Lennarz, J.Liang, M.Lovely, M.Luo, C.Marshall, S.N.Paneru, A.Parikh, C.Ruiz, A.C.Shotter, M.Williams

First inverse kinematics measurement of resonances in 7Be(α, γ)11C relevant to neutrino-driven wind nucleosynthesis using DRAGON

NUCLEAR REACTIONS 4He(7Be, γ), E=351-464 keV/nucleon; measured reaction products, Eγ, Iγ, γ-sum, (particle)γ-coin; deduced 1110-, 1115- and 876-keV resonances strength, thermonuclear reaction rate (T=0.1-10 GK), astrophysical S-factor. Discussed the impact of newly determined rates on studies of nucleosynthesis in neutrino-driven winds. Helium-filled windowless gas target surrounded by γ-ray array of 30 BGO scintillator crystals at DRAGON recoil separator (TRIUMF).

doi: 10.1103/PhysRevC.106.045805
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Data from this article have been entered in the XUNDL database. For more information, click here.


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
Citations: PlumX Metrics


2022WI02      Phys.Rev. C 105, 065805 (2022)

M.Williams, A.M.Laird, A.Choplin, P.Adsley, B.Davids, U.Greife, K.Hudson, D.Hutcheon, A.Lennarz, C.Ruiz

Constraints on key 17O(α, γ)21Ne resonances and impact on the weak s process

NUCLEAR REACTIONS 4He(17O, γ)21Ne, E(cm)=1311, 811, 721, 634, 613 keV; measured reaction products, recoiling 21Ne nuclei, (recoil)γ-coin using DRAGON facility of ISAC-I at TRIUMF, and a 4π array of 30 BGO scintillators; deduced time-of-flight (TOF) spectra for resonant yield measurements. 21Ne; deduced levels, resonances, resonance strengths, and compared with previous experimental results. 17O(α, γ)21Ne, T=0.010-10.0 GK; deduced thermonuclear reaction rates using sing the RATESMC Monte Carlo code, and s-process elemental yields.

doi: 10.1103/PhysRevC.105.065805
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2774. Data from this article have been entered in the XUNDL database. For more information, click here.


2021HO15      Phys.Lett. B 822, 136710 (2021)

M.Holl, R.Kanungo, Z.H.Sun, G.Hagen, J.A.Lay, A.M.Moro, P.Navratil, T.Papenbrock, M.Alcorta, D.Connolly, B.Davids, A.Diaz Varela, M.Gennari, G.Hackman, J.Henderson, S.Ishimoto, A.I.Kilic, R.Krucken, A.Lennarz, J.Liang, J.Measures, W.Mittig, O.Paetkau, A.Psaltis, S.Quaglioni, J.S.Randhawa, J.Smallcombe, I.J.Thompson, M.Vorabbi, M.Williams

Proton inelastic scattering reveals deformation in 8He

NUCLEAR REACTIONS 1H(8He, p), E=8.25 MeV/nucleon; measured reaction products, Ep, Ip. 8He; deduced σ(θ), resonance parameters, first 2+ state, quadrupole deformation parameter. Comparison with no-core shell model predictions. Charged particle spectroscopy station IRIS at TRIUMF in Canada.

doi: 10.1016/j.physletb.2021.136710
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2684.


2021LO09      Phys.Rev. C 103, 055801 (2021)

M.Lovely, A.Lennarz, D.Connolly, M.Williams, M.Alcorta, A.A.Chen, B.Davids, N.E.Esker, C.Fry, S.A.Gillespie, R.Giri, U.Greife, A.Hussein, D.Hutcheon, J.Karpesky, L.Kroll, J.Liang, P.D.O'Malley, S.Paneru, A.Psaltis, C.Ruiz, A.C.Shotter, for the DRAGON Collaboration

Proton capture on 34S in the astrophysical energy regime of O-Ne novae

NUCLEAR REACTIONS 1H(34S, γ)35Cl, E=518.6 keV/nucleon from the ISAC facility of TRIUMF; measured recoils, Eγ, Iγ, TOF using DRAGON separator having four components, windowless gas target, BGO array for γ rays, two stage electromagnetic separator, and heavy ion detector system of double-sided silicon strip detector (DSSSD) and an ionization chamber (IC) for recoils. 35Cl; deduced energies of resonances, resonance strengths, astrophysical reaction rates. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.103.055801
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2629. Data from this article have been entered in the XUNDL database. For more information, click here.


2021LO11      Phys.Rev.Lett. 127, 112701 (2021)

G.Lotay, S.A.Gillespie, M.Williams, T.Rauscher, M.Alcorta, A.M.Amthor, C.A.Andreoiu, D.Baal, G.C.Ball, S.S.Bhattacharjee, H.Behnamian, V.Bildstein, C.Burbadge, W.N.Catford, D.T.Doherty, N.E.Esker, F.H.Garcia, A.B.Garnsworthy, G.Hackman, S.Hallam, K.A.Hudson, S.Jazrawi, E.Kasanda, A.R.L.Kennington, Y.H.Kim, A.Lennarz, R.S.Lubna, C.R.Natzke, N.Nishimura, B.Olaizola, C.Paxman, A.Psaltis, C.E.Svensson, J.Williams, B.Wallis, D.Yates, D.Walter, B.Davids

First Direct Measurement of an Astrophysical p-Process Reaction Cross Section Using a Radioactive Ion Beam

NUCLEAR REACTIONS 1H(83Rb, γ), (84Kr, γ), E=2.4, 2.7 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, partial σ. Comparison with statistical model calculations.

doi: 10.1103/PhysRevLett.127.112701
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2660.


2021PS01      Nucl.Instrum.Methods Phys.Res. A987, 164828 (2021)

A.Psaltis, A.A.Chen, D.S.Connolly, B.Davids, G.Gilardy, R.Giri, U.Greife, W.Huang, D.A.Hutcheon, J.Karpesky, A.Lennarz, J.Liang, M.Lovely, S.N.Paneru, C.Ruiz, G.Tenkila, M.Williams

Beyond the acceptance limit of DRAGON: The case of the 6Li(α, γ)10B reaction

NUCLEAR REACTIONS 6Li(α, γ), E=3.6 MeV; measured reaction products, TOF, Eγ, Iγ; deduced Q-value, resonance parameters. Comparison with available data.

doi: 10.1016/j.nima.2020.164828
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2592. Data from this article have been entered in the XUNDL database. For more information, click here.


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

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

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

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

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


2021WI03      Phys.Rev. C 103, 055805 (2021)

M.Williams, P.Adsley, B.Davids, U.Greife, D.Hutcheon, J.Karpesky, A.Lennarz, M.Lovely, C.Ruiz

New measurement of the Ec.m. = 323 KeV resonance in the 19F(p, γ)20Ne reaction

NUCLEAR REACTIONS 1H(19F, γ)20Ne, E=6.668 MeV from the ISAC-I facility of TRIUMF; measured recoils, Eγ, Iγ, (recoils)γ-coin, MCP RF-TOF using DRAGON separator with BGO array for γ rays and heavy ion detector system of double-sided silicon strip detector (DSSSD) and MCP for recoils. 20Ne; deduced γ-ray branching ratios from the 323-keV proton resonance in 20Ne, resonance strengths, width, thermonuclear reaction rates at T=0.01-10 GK and compared with previous experimental results and with compiled data in NACRE database.

doi: 10.1103/PhysRevC.103.055805
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2630. Data from this article have been entered in the XUNDL database. For more information, click here.


2020FA06      Phys.Lett. B 807, 135575 (2020)

J.Fallis, C.Akers, A.M.Laird, A.Simon, A.Spyrou, G.Christian, D.Connolly, U.Hager, D.A.Hutcheon, A.Lennarz, P.O'Malley, S.J.Quinn, J.Riley, A.Rojas, C.Ruiz, M.Williams

First measurement in the Gamow window of a reaction for the γ process in inverse kinematics: 76Se(α, γ)80Kr

NUCLEAR REACTIONS 4He(76Se, γ)80Kr, E=1.4-1.5 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ, reaction rates. Comparison with calculations.

doi: 10.1016/j.physletb.2020.135575
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2580.


2020FR07      Phys.Rev.Lett. 125, 032701 (2020)

S.Fretwell, K.G.Leach, C.Bray, G.B.Kim, J.Dilling, A.Lennarz, X.Mougeot, F.Ponce, C.Ruiz, J.Stackhouse, S.Friedrich

Direct Measurement of the 7Be L/K Capture Ratio in Ta-Based Superconducting Tunnel Junctions

RADIOACTIVITY 7Be(EC); measured decay products, phonons; deduced recoil spectra, L/K ratio.

doi: 10.1103/PhysRevLett.125.032701
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Data from this article have been entered in the XUNDL database. For more information, click here.


2020LE06      J.Phys.(London) G47, 045113 (2020)

E.Leistenschneider, R.Klawitter, A.Lennarz, M.Alanssari, J.C.Bale, B.R.Barquest, U.Chowdhury, A.Finlay, A.T.Gallant, B.Kootte, D.Lascar, K.G.Leach, A.J.Mayer, D.Short, C.Andreoiu, G.Gwinner, M.E.Wieser, J.Dilling, A.A.Kwiatkowski

Diversifying beam species through decay and recapture ion trapping: a demonstrative experiment at TITAN-EBIT

RADIOACTIVITY 30Mg, 30Al(β-) [from U(p, X), E=480 MeV]; measured decay products, Eγ, Iγ; deduced γ-ray energies, population and charge-state evolutions and in-trap decay at TITAN-EBIT, identification of daughter species. TRIUMF's ISOL facility, the isotope separator and accelerator (ISAC).

ATOMIC MASSES 30Mg, 30Al; measured ToF-ICR resonance frequencies; deduced atomic mass excesses. Comparison with available data.

doi: 10.1088/1361-6471/ab6ee1
Citations: PlumX Metrics


2020LE11      Phys.Lett. B 807, 135539 (2020)

A.Lennarz, M.Williams, A.M.Laird, U.Battino, A.A.Chen, D.Connolly, B.Davids, N.Esker, R.Garg, M.Gay, U.Greife, U.Hager, D.Hutcheon, J.Jose, M.Lovely, S.Lyons, A.Psaltis, J.E.Riley, A.Tattersall, C.Ruiz

First inverse kinematics measurement of key resonances in the 22Ne(p, γ)23Na reaction at stellar temperatures

NUCLEAR REACTIONS 1H(22Ne, γ)23Na, E not given; measured reaction products; deduced resonance strengths, reaction rates.

doi: 10.1016/j.physletb.2020.135539
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2572.


2020WI08      Phys.Rev. C 102, 035801 (2020)

M.Williams, A.Lennarz, A.M.Laird, U.Battino, J.Jose, D.Connolly, C.Ruiz, A.Chen, B.Davids, N.Esker, B.R.Fulton, R.Garg, M.Gay, U.Greife, U.Hager, D.Hutcheon, M.Lovely, S.Lyons, A.Psaltis, J.E.Riley, A.Tattersall

First inverse kinematics study of the 22Ne(p, γ)23Na reaction and its role in AGB star and classical nova nucleosynthesis

NUCLEAR REACTIONS 1H(22Ne, γ)23Na, E=161-1274 keV/nucleon from ISAC-I-TRIUMF facility, followed by mass separation of 22Ne fragments; measured Eγ, Iγ, heavy-ion evaporation products, (recoils)γ-coin, time-of-flight spectra using DRAGON array and microchannel plate (MCP) detectors. 23Na; deduced levels, proton resonances, resonance strengths, direct capture cross sections and astrophysical S factors, thermonuclear reaction rates from 0.010 to 10.0 GK. Predicted ejecta mass fractions for 20,21,22Ne, 22,23Na, 24,25,26Mg, 26,27Al. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.102.035801
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2582. Data from this article have been entered in the XUNDL database. For more information, click here.


2017BR14      Phys.Rev. C 96, 034316 (2017)

M.Brodeur, A.A.Kwiatkowski, O.M.Drozdowski, C.Andreoiu, D.Burdette, A.Chaudhuri, U.Chowdhury, A.T.Gallant, A.Grossheim, G.Gwinner, H.Heggen, J.D.Holt, R.Klawitter, J.Lassen, K.G.Leach, A.Lennarz, C.Nicoloff, S.Raeder, B.E.Schultz, S.R.Stroberg, A.Teigelhofer, R.Thompson, M.Wieser, J.Dilling

Precision mass measurements of magnesium isotopes and implications for the validity of the isobaric mass multiplet equation

ATOMIC MASSES 27,28,29Mg; measured cyclotron frequencies, mass excesses using TITAN Penning trap at ISAC-TRIUMF facility; deduced S(p). Comparison with AME-2016 evaluated data, and with ab initio calculations from the valence-space in-medium similarity renormalization group. 27,28,29Mg produced in SiC(p, X), E=480 MeV reaction, followed by laser resonance ionization in a radio-frequency ion guide (IG-LIS).29Mg, 29Cl, 30Mg, 30Ar; analyzed isobaric mass multiplet equation (IMME) in the form of a cubic term. 28S, 29Cl; need to confirm mass excess of 28S and S(n) of 29Cl.

doi: 10.1103/PhysRevC.96.034316
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2017GA20      Phys.Rev. C 96, 024325 (2017)

A.T.Gallant, M.Alanssari, J.C.Bale, C.Andreoiu, B.R.Barquest, U.Chowdhury, J.Even, A.Finlay, D.Frekers, G.Gwinner, R.Klawitter, B.Kootte, A.A.Kwiatkowski, D.Lascar, K.G.Leach, E.Leistenschneider, A.Lennarz, A.J.Mayer, D.Short, R.Thompson, M.Wieser, D.Lunney, J.Dilling

Mass determination near N=20 for Al and Na isotopes

ATOMIC MASSES 31,32Na, 29,34,35Al; measured cyclotron frequencies and mass excesses by time-of-flight ion-cyclotron-resonance (TOF-ICR) technique using the TITAN Penning trap mass spectrometer at ISAC-TRIUMF; deduced S(2n). Radioactive isotopes produced via the isotope separator on-line (ISOL) technique by a 480-MeV proton beam impinging on a UCx target, followed by the separation of sodium isotopes by surface ionization, and aluminum isotopes by the TRIUMF Resonant Ionization Laser Ion Source (TRILIS). Comparison with previous experimental values and mass evaluations. Systematics of S(2n) values for N=18-25 Na, Mg, and Al isotopic chains.

doi: 10.1103/PhysRevC.96.024325
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2017RE10      Phys.Rev. C 96, 052501 (2017)

M.P.Reiter, K.G.Leach, O.M.Drozdowski, S.R.Stroberg, J.D.Holt, C.Andreoiu, C.Babcock, B.Barquest, M.Brodeur, A.Finlay, M.Foster, A.T.Gallant, G.Gwinner, R.Klawitter, B.Kootte, A.A.Kwiatkowski, Y.Lan, D.Lascar, E.Leistenschneider, A.Lennarz, S.Paul, R.Steinbrugge, R.I.Thompson, M.Wieser, J.Dilling

High-precision QEC-value measurement of the superallowed β+ emitter 22Mg and an ab initio evaluation of the A=22 isobaric triplet

ATOMIC MASSES 22Mg; measured time-of-flight quadrupole-excitation and Ramsey-excitation resonance spectra using Ion Trap for Atomic and Nuclear Science (TITAN) at TRIUMF; deduced average frequency ratios for the mass measurements. 22Mg, 22Na; deduced mass excesses and Q value for ϵ decay of 22Mg decay to 22Na. Comparison with AME-2016 and Hardy-Towner evaluations. 22Mg, 22Ne, 22Na; deduced new coefficients of the IMME by using state-of-the-art ab initio shell-model calculations of the IAS energies. Relevance to isospin-symmetry-breaking (ISB) correction in superallowed β decays.

doi: 10.1103/PhysRevC.96.052501
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2017WI14      Phys.Rev.Lett. 119, 242701 (2017)

R.Wilkinson, G.Lotay, A.Lennarz, C.Ruiz, G.Christian, C.Akers, W.N.Catford, A.A.Chen, D.Connolly, B.Davids, D.A.Hutcheon, D.Jedrejcic, A.M.Laird, L.Martin, E.McNeice, J.Riley, M.Williams

Direct Measurement of the Key Ec.m. = 456 keV Resonance in the Astrophysical 19Ne(p, γ)20Na Reaction and Its Relevance for Explosive Binary Systems

NUCLEAR REACTIONS H(19Ne, γ), E=9.24 MeV; measured reaction products, Eγ, Iγ, Eβ, Iβ. 19Ne, 20Na; deduced resonance parameters, reaction rates. Comparison with available data.

doi: 10.1103/PhysRevLett.119.242701
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2016KL04      Phys.Rev. C 93, 045807 (2016)

R.Klawitter, A.Bader, M.Brodeur, U.Chowdhury, A.Chaudhuri, J.Fallis, A.T.Gallant, A.Grossheim, A.A.Kwiatkowski, D.Lascar, K.G.Leach, A.Lennarz, T.D.Macdonald, J.Pearkes, S.Seeraji, M.C.Simon, V.V.Simon, B.E.Schultz, J.Dilling

Mass measurements of neutron-rich Rb and Sr isotopes

ATOMIC MASSES 98,99,100Rb, 98,99,100,101Sr; measured cyclotron frequency using the time-of-flight ion-cyclotron-resonance technique (TOF-ICR) using TITAN Penning-trap mass spectrometer at ISAC-TRIUMF; deduced mass excesses. Comparison with previous measurements and AME-2012 evaluation. Rb and Sr ions produced in U(p, F), E=480 MeV reaction and separated by a dipole magnet.

doi: 10.1103/PhysRevC.93.045807
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2015CH58      Phys.Rev. C 92, 045803 (2015)

U.Chowdhury, K.G.Leach, C.Andreoiu, A.Bader, M.Brodeur, A.Chaudhuri, A.T.Gallant, A.Grossheim, G.Gwinner, R.Klawitter, A.A.Kwiatkowski, A.Lennarz, T.D.Macdonald, J.Pearkes, B.E.Schultz, J.Dilling

First direct mass measurement of the neutron-deficient nucleus 24Al

ATOMIC MASSES 24Al; measured time-of-flight quadrupole excitation resonance spectrum for 24Al ions, mass excess using TITAN Penning-Trap mass spectrometer and Ion-Guide Laser Ion Source (IG-LIS) at TRIUMF; deduced S(p). Comparison with other data and with AME-2012.

NUCLEAR REACTIONS 23Mg(p, γ)24Al; measured reaction resonance energy of astrophysical interest. Comparison with data from DRAGON at TRIUMF.

doi: 10.1103/PhysRevC.92.045803
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2015FR02      Phys.Rev. C 91, 034608 (2015); Erratum Phys.Rev. C 100, 049901 (2019)

D.Frekers, T.Adachi, H.Akimune, M.Alanssari, B.A.Brown, B.T.Cleveland, H.Ejiri, H.Fujita, Y.Fujita, M.Fujiwara, V.N.Gavrin, M.N.Harakeh, K.Hatanaka, M.Holl, C.Iwamoto, A.Lennarz, A.Okamoto, H.Okamura, T.Suzuki, A.Tamii

Precision evaluation of the 71Ga (νe, e-) solar neutrino capture rate from the (3He, t) charge-exchange reaction

NUCLEAR REACTIONS 71Ga(3He, t)71Ge, E=420 MeV; measured triton spectra, σ(θ) using Grand Raiden spectrometer at RCNP-Osaka facility. 71Ge; deduced levels, J, π, IAS, Gamow-Teller B(GT) transition strengths from analysis based on theoretical form factors and one-body transition densities from the shell-model code NUSHELLX with the GXPF1a interaction in full fp-model space. DWBA analysis of σ(θ) data. 71Ga(ν, e-); deduced solar neutrino capture rates as function of excitation energy in 71Ge from B(GT) values.

doi: 10.1103/PhysRevC.91.034608
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2015KW01      Phys.Rev. C 92, 061301 (2015)

A.A.Kwiatkowski, C.Andreoiu, J.C.Bale, A.Chaudhuri, U.Chowdhury, S.Malbrunot-Ettenauer, A.T.Gallant, A.Grossheim, G.Gwinner, A.Lennarz, T.D.Macdonald, T.J.M.Rauch, B.E.Schultz, S.Seeraji, M.C.Simon, V.V.Simon, D.Lunney, A.Poves, J.Dilling

Observation of a crossover of S2n in the island of inversion from precision mass spectrometry

ATOMIC MASSES 27,29,30,31,32,33,34Al; measured TOF-ICR resonance, mass excess using Ion Trap for Atomic and Nuclear science (TITAN) Penning-trap facility at TRIUMF. Comparison with AME-2012, and previous experimental values. Systematics of S(2n) values for 28,29,30,31,32,33,34,35,36,37Mg, 29,30,31,32,33,34,35,36,37,38Al, comparison of experimental and theoretical values; deduced crossover at N=21 in the island of inversion. Large-scale shell-model calculations.

doi: 10.1103/PhysRevC.92.061301
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2014GA20      Phys.Rev.Lett. 113, 082501 (2014)

A.T.Gallant, M.Brodeur, C.Andreoiu, A.Bader, A.Chaudhuri, U.Chowdhury, A.Grossheim, R.Klawitter, A.A.Kwiatkowski, K.G.Leach, A.Lennarz, T.D.Macdonald, B.E.Schultz, J.Lassen, H.Heggen, S.Raeder, A.Teigelhofer, B.A.Brown, A.Magilligan, J.D.Holt, J.Menendez, J.Simonis, A.Schwenk, J.Dilling

Breakdown of the Isobaric Multiplet Mass Equation for the A=20 and 21 Multiplets

ATOMIC MASSES 20,21Mg; measured time-of-flight ion cyclotron resonance; deduced masses. Comparison with shell model calculations, AME2012 mass evaluation.

doi: 10.1103/PhysRevLett.113.082501
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2014KW01      Hyperfine Interactions 225, 143 (2014)

A.A.Kwiatkowski, C.Andreoiu, J.C.Bale, T.Brunner, A.Chaudhuri, U.Chowdhury, P.Delheij, S.Ettenauer, D.Frekers, A.T.Gallant, A.Grossheim, G.Gwinner, F.Jang, A.Lennarz, T.Ma, E.Mane, M.R.Pearson, B.E.Schultz, M.C.Simon, V.V.Simon, J.Dilling

TITAN: An ion trap facility for on-line mass measurement experiments

doi: 10.1007/s10751-013-0892-8
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2014KW04      Phys.Rev. C 89, 045502 (2014)

A.A.Kwiatkowski, T.Brunner, J.D.Holt, A.Chaudhuri, U.Chowdhury, M.Eibach, J.Engel, A.T.Gallant, A.Grossheim, M.Horoi, A.Lennarz, T.D.Macdonald, M.R.Pearson, B.E.Schultz, M.C.Simon, R.A.Senkov, V.V.Simon, K.Zuber, J.Dilling

New determination of double-β-decay properties on 48Ca High-precision Qββ-value measurement and improved nuclear matrix element calculations

ATOMIC MASSES 48Ca, 48Ti; measured cyclotron-frequencies, resonances using TITAN system consisting of radio frequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion trap (EBIT), and a Penning trap (MPET) at ISAC-TRIUMF facility; deduced Q value for double β decay of 48Ti. Comparison with previous measurements and atomic mass evaluations (AME-2003 and AME-2012).

RADIOACTIVITY 48Ca(2β-); measured precise Q-value using TITAN system at ISAC-TRIUMF facility; calculated ββ nuclear matrix element by including effects of levels outside the valence space in a shell-model; discussed case for a new experiment on double-beta decay of 48Ca.

doi: 10.1103/PhysRevC.89.045502
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2014LE02      Hyperfine Interactions 225, 157 (2014)

A.Lennarz, T.Brunner, C.Andreoiu, A.Chaudhuri, U.Chowdhury, P.Delheij, J.Dilling, S.Ettenauer, D.Frekers, A.T.Gallant, A.Grossheim, F.Jang, A.A.Kwiatkowski, T.Ma, E.Mane, M.R.Pearson, B.E.Schultz, M.C.Simon, V.V.Simon

Electron-capture branching ratio measurements of odd-odd intermediate nuclei in double-beta decay at the TITAN facility

RADIOACTIVITY 116In(β-), (EC); measured decay products, Eγ, Iγ, X-rays; deduced isomers, energy levels, J, π. Comparison with available data.

doi: 10.1007/s10751-013-0893-7
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2014LE20      Phys.Rev.Lett. 113, 082502 (2014)

A.Lennarz, A.Grossheim, K.G.Leach, M.Alanssari, T.Brunner, A.Chaudhuri, U.Chowdhury, J.R.C.Lopez-Urrutia, A.T.Gallant, M.Holl, A.A.Kwiatkowski, J.Lassen, T.D.Macdonald, B.E.Schultz, S.Seeraji, M.C.Simon, C.Andreoiu, J.Dilling, D.Frekers

In-Trap Spectroscopy of Charge-Bred Radioactive Ions

RADIOACTIVITY 124In(β-), 124Cs(EC); measured decay products, Eγ, Iγ, X-rays; deduced isomer yields, T1/2, γ-ray energies, branching ratios. Electron-beam ion trap of the TITAN facility at TRIUMF.

doi: 10.1103/PhysRevLett.113.082502
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2014MA21      Phys.Rev. C 89, 044318 (2014)

T.D.Macdonald, B.E.Schultz, J.C.Bale, A.Chaudhuri, U.Chowdhury, D.Frekers, A.T.Gallant, A.Grossheim, A.A.Kwiatkowski, A.Lennarz, M.C.Simon, V.V.Simon, J.Dilling

Precision Penning-trap measurement to investigate the role of the51Cr (e-, νe) 51V Q value in the gallium anomaly

ATOMIC MASSES 51Cr, 51V; measured cyclotron-frequencies, TOF-ICR resonances using TITAN system consisting of radio frequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion trap (EBIT), and a Penning trap (MPET) at ISAC-TRIUMF facility; deduced Q value for EC decay of 51Cr. Comparison with AME-2012 evaluation. Relevance to solar neutrino experiments SAGE and GALLEX.

RADIOACTIVITY 51Cr(EC); measured precise Q(EC) value using TITAN system for precise mass measurements at ISAC-TRIUMF facility.

doi: 10.1103/PhysRevC.89.044318
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2014SC09      Phys.Rev. C 90, 012501 (2014)

B.E.Schultz, M.Brodeur, C.Andreoiu, A.Bader, A.Chaudhuri, U.Chowdhury, A.T.Gallant, A.Grossheim, R.Klawitter, A.A.Kwiatkowski, K.G.Leach, A.Lennarz, T.D.Macdonald, J.Lassen, H.Heggen, S.Raeder, A.Teigelhofer, J.Dilling

Precision QEC-value measurement of 23Mg for testing the Cabibbo-Kobayashi-Maskawa matrix unitarity

ATOMIC MASSES 23Mg; measured quadrupole and Ramsey resonances, frequency ratios of 23Mg+ to 23Na+ using TITAN Penning-trap mass spectrometer at ISAC-TRIUMF facility; deduced Q value for 23Mg decay. Comparison with AME-2012.

RADIOACTIVITY 23Mg(EC)[from Si(p, X), E=480 MeV]; measured precise mass; deduced Q value, statistical rate function, ft value of mirror β transition. Comparison of Q value with AME-2012 evaluation. Test of the Cabibbo-Kobayashi-Maskawa matrix unitarity.

doi: 10.1103/PhysRevC.90.012501
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2013BR16      Eur.Phys.J. A 49, 142 (2013)

T.Brunner, A.Lapierre, C.Andreoiu, M.Brodeur, P.Delheij, S.Ettenauer, D.Frekers, A.T.Gallant, R.Gernhauser, A.Grossheim, R.Krucken, A.Lennarz, D.Lunney, D.Mucher, R.Ringle, M.C.Simon, V.V.Simon, S.K.L.Sjue, K.Zuber, J.Dilling

Trapped-ion decay spectroscopy towards the determination of ground-state components of double-beta decay matrix elements

RADIOACTIVITY 124,125,126Cs(EC), (β+), (IT); measured Eγ, Iγ, X-ray. Method test experiment for possible determination of 2β matrix elements.

doi: 10.1140/epja/i2013-13142-4
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2013CH49      Phys.Rev. C 88, 054317 (2013)

A.Chaudhuri, C.Andreoiu, T.Brunner, U.Chowdhury, S.Ettenauer, A.T.Gallant, G.Gwinner, A.A.Kwiatkowski, A.Lennarz, D.Lunney, T.D.Macdonald, B.E.Schultz, M.C.Simon, V.V.Simon, J.Dilling

Evidence for the extinction of the N=20 neutron-shell closure for 32Mg from direct mass measurements

ATOMIC MASSES 29,30,31Na, 30,31,32,33,34Mg; measured Time-of-flight (TOF) ion-cyclotron resonances using TITAN Penning trap at ISAC-TRIUMF with respect to 16O and 39K references. Comparison with previous experimental data and with AME evaluations. Systematics of S(2n) values for N=18-24 Na and Mg isotopes; and experimental and theoretical neutron shell gap N=20, Z=10-22 nuclei. Discussed magicity of N=20 shell closure.

doi: 10.1103/PhysRevC.88.054317
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2013FR13      Phys.Lett. B 722, 233 (2013)

D.Frekers, M.C.Simon, C.Andreoiu, J.C.Bale, M.Brodeur, T.Brunner, A.Chaudhuri, U.Chowdhury, J.R.C.Lopez-Urrutia, P.Delheij, H.Ejiri, S.Ettenauer, A.T.Gallant, V.Gavrin, A.Grossheim, M.N.Harakeh, F.Jang, A.A.Kwiatkowski, J.Lassen, A.Lennarz, M.Luichtl, T.Ma, T.D.Macdonald, E.Mane, D.Robertson, B.E.Schultz, V.V.Simon, A.Teigelhofer, J.Dilling

Penning-trap Q-value determination of the 71Ga(ν, e-)71Ge reaction using threshold charge breeding of on-line produced isotopes

ATOMIC MASSES 71Ga, 71Ge; measured TOF, TOF-ICR, ion cyclotron resonance spectra; deduced Q-value and its uncertainty. TITAN Penning trap at ISAC/TRIUMF, comparison with AME data.

doi: 10.1016/j.physletb.2013.04.019
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2012GA29      Phys.Rev.Lett. 109, 032506 (2012)

A.T.Gallant, J.C.Bale, T.Brunner, U.Chowdhury, S.Ettenauer, A.Lennarz, D.Robertson, V.V.Simon, A.Chaudhuri, J.D.Holt, A.A.Kwiatkowski, E.Mane, J.Menendez, B.E.Schultz, M.C.Simon, C.Andreoiu, P.Delheij, M.R.Pearson, H.Savajols, A.Schwenk, J.Dilling

New Precision Mass Measurements of Neutron-Rich Calcium and Potassium Isotopes and Three-Nucleon Forces

ATOMIC MASSES 51,52Ca, 51K; measured TOF-ICR resonances, average frequency ratios; deduced masses. Comparison with available data. TRIUMF TITAN trap, comparison with available data, KB3G and GXPF1A effective interactions.

doi: 10.1103/PhysRevLett.109.032506
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2012PU02      Phys.Rev. C 86, 044603 (2012)

P.Puppe, A.Lennarz, T.Adachi, H.Akimune, H.Ejiri, D.Frekers, H.Fujita, Y.Fujita, M.Fujiwara, E.Ganioglu, E.-W.Grewe, K.Hatanaka, R.Hodak, C.Iwamoto, N.T.Khai, A.Okamoto, H.Okamura, P.P.Povinec, G.Susoy, T.Suzuki, A.Tamii, J.H.Thies, M.Yosoi

High resolution (3He, t)experiment on the double-β decaying nuclei 128Te and 130Te

NUCLEAR REACTIONS 128,130Te(3He, t), E=420 MeV; measured triton spectra, σ(θ) using Grand Raiden magnetic spectrometer at RCNP facility. 128,130I; deduced levels, J, π, IAS, B(GT). DWBA analysis. Discussed impact on ββ decay matrix elements for 128,130Te.

doi: 10.1103/PhysRevC.86.044603
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2012TH06      Phys.Rev. C 86, 014304 (2012)

J.H.Thies, D.Frekers, T.Adachi, M.Dozono, H.Ejiri, H.Fujita, Y.Fujita, M.Fujiwara, E.-W.Grewe, K.Hatanaka, P.Heinrichs, D.Ishikawa, N.T.Khai, A.Lennarz, H.Matsubara, H.Okamura, Y.Y.Oo, P.Puppe, T.Ruhe, K.Suda, A.Tamii, H.P.Yoshida, R.G.T.Zegers

The (3He, t) reaction on 76Ge, and the double-β-decay matrix element

NUCLEAR REACTIONS 76Ge(3He, t)76As, E=420 MeV; measured triton spectra, σ(θ) using Grand Raiden spectrometer at RCNP facility. 76As; deduced levels, L-transfers, J, π, IAS, GT resonance (GTR) and the spin-dipole resonance (SDR), B(GT) values. DWBA analysis of Σ(θ) data. Comparison of B(GT)- distributions with B(GT)+ from 76Se(d, 2He)76As reaction. Discussed impact on double-beta decay matrix elements for 76Ge decay.

RADIOACTIVITY 76Ge(2β-); analyzed double beta-decay matrix elements.

doi: 10.1103/PhysRevC.86.014304
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2012TH08      Phys.Rev. C 86, 044309 (2012)

J.H.Thies, T.Adachi, M.Dozono, H.Ejiri, D.Frekers, H.Fujita, Y.Fujita, M.Fujiwara, E.-W.Grewe, K.Hatanaka, P.Heinrichs, D.Ishikawa, N.T.Khai, A.Lennarz, H.Matsubara, H.Okamura, Y.Y.Oo, P.Puppe, T.Ruhe, K.Suda, A.Tamii, H.P.Yoshida, R.G.T.Zegers

High-resolution 100Mo(3He, t)100Tc charge-exchange experiment and the impact on double-β decays and neutrino charged-current reactions

NUCLEAR REACTIONS 100Mo(3He, t), E=420 MeV; measured triton spectra, σ(θ) at RCNP facility. 100Tc; deduced levels, IAS, J, π, B(GT). Discussed impact on the matrix elements for 2νββ decay. DWBA analysis.

doi: 10.1103/PhysRevC.86.044309
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2012TH12      Phys.Rev. C 86, 054323 (2012)

J.H.Thies, P.Puppe, T.Adachi, M.Dozono, H.Ejiri, D.Frekers, H.Fujita, Y.Fujita, M.Fujiwara, E.-W.Grewe, K.Hatanaka, P.Heinrichs, D.Ishikawa, N.T.Khai, A.Lennarz, H.Matsubara, H.Okamura, Y.Y.Oo, T.Ruhe, K.Suda, A.Tamii, H.P.Yoshida, R.G.T.Zegers

High-resolution 96Zr(3He, t) experiment and the matrix element for double-β decay

NUCLEAR REACTIONS 90,92,96Zr(3He, t), E=420 MeV; measured triton spectra, σ(θ) using Grand Raiden spectrometer at RCNP facility. 90,92,96Nb; deduced levels, IAS, L-transfers, J, π, B(GT), nuclear matrix element for 2νββ decay of 96Zr. 91,94Zr(3He, t), E=420 MeV; measured triton spectrum; deduced IAS in 91,94Nb. Comparison with shell model calculations, and with previous study of 96Mo(d, 2He)96Nb reaction.

doi: 10.1103/PhysRevC.86.054323
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2011FR15      Phys.Lett. B 706, 134 (2011)

D.Frekers, H.Ejiri, H.Akimune, T.Adachi, B.Bilgier, B.A.Brown, B.T.Cleveland, H.Fujita, Y.Fujita, M.Fujiwara, E.Ganioglu, V.N.Gavrin, E.-W.Grewe, C.J.Guess, M.N.Harakeh, K.Hatanaka, R.Hodak, M.Holl, C.Iwamoto, N.T.Khai, H.C.Kozer, A.Lennarz, A.Okamoto, H.Okamura, P.P.Povinec, P.Puppe, F.Simkovic, G.Susoy, T.Suzuki, A.Tamii, J.H.Thies, J.Van de Walle, R.G.T.Zegers

The 71Ga(3He, t) reaction and the low-energy neutrino response

NUCLEAR REACTIONS 71Ga(3He, t), E=420 MeV; measured reaction products; deduced isobaric-analogue resonance yields, σ(θ), Gamow-Teller strength values. SAGE and GALLEX calibration implications.

doi: 10.1016/j.physletb.2011.10.061
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2011PU06      Phys.Rev. C 84, 051305 (2011)

P.Puppe, D.Frekers, T.Adachi, H.Akimune, N.Aoi, B.Bilgier, H.Ejiri, H.Fujita, Y.Fujita, M.Fujiwara, E.Ganioglu, M.N.Harakeh, K.Hatanaka, M.Holl, H.C.Kozer, J.Lee, A.Lennarz, H.Matsubara, K.Miki, S.E.A.Orrigo, T.Suzuki, A.Tamii, J.H.Thies

High-resolution (3He, t) reaction on the double-β decaying nucleus 136Xe

NUCLEAR REACTIONS 136Xe(3He, t), E=420 MeV; measured E(t), I(t), σ(θ) using Grand-Raiden spectrometer. 136Cs; deduced levels, J, π, l-values, Gamow-Teller (GT) transition strengths. DWBA analysis. Relevance to double beta decay matrix elements for 136Xe.

doi: 10.1103/PhysRevC.84.051305
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