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NSR database version of April 11, 2024.

Search: Author = C.Sumithrarachchi

Found 69 matches.

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2024BH03      Phys.Rev. C 109, L022501 (2024)

R.Bhandari, G.Bollen, T.Brunner, N.D.Gamage, A.Hamaker, Z.Hockenbery, M.Horana Gamage, D.K.Keblbeck, K.G.Leach, D.Puentes, M.Redshaw, R.Ringle, S.Schwarz, C.S.Sumithrarachchi, I.Yandow

First direct 7Be electron-capture Q-value measurement toward high-precision searches for neutrino physics beyond the Standard Model

doi: 10.1103/PhysRevC.109.L022501
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2023DO07      Appl.Radiat.Isot. 200, 110958 (2023)

K.A.Domnanich, S.Satija, V.S.Bodnar, G.Bollen, C.R.Kleinfeldt, Y.Liu, S.Rogers, S.Schwarz, G.W.Severin, C.Sumithrarachchi, A.C.C.Villari

Preparation of stable and long-lived source samples for the stand-alone beam program at the Facility for Rare Isotope Beams

doi: 10.1016/j.apradiso.2023.110958
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2023HA31      Phys.Rev. C 108, 034608 (2023)

K.Haak, O.B.Tarasov, P.Chowdhury, A.M.Rogers, K.Sharma, T.Baumann, D.Bazin, P.C.Bender, J.Chen, A.Estrade, M.A.Famiano, D.C.Foulds-Holt, N.Fukuda, A.Gade, T.N.Ginter, R.W.Gohier, M.Hausmann, A.M.Hill, D.E.M.Hoff, L.Klankowski, E.Kwan, J.Li, S.N.Liddick, B.Longfellow, S.Lyons, C.Morse, M.Portillo, D.Rhodes, A.L.Richard, S.Samaranayake, B.M.Sherrill, M.K.Smith, M.Spieker, C.S.Sumithrarachchi, H.Suzuki, K.Wang, S.Waniganeththi, D.Weisshaar, S.Zhu

Production and discovery of neutron-rich isotopes by fragmentation of 198Pt

NUCLEAR REACTIONS 9Be, Ni(198Pt, X)182Yb/183Lu/184Lu/185Lu/186Lu/187Lu/188Lu/189Lu/184Hf/185Hf/186Hf/187Hf/188Hf/189Hf/190Hf/191Hf/192Hf/185Ta/186Ta/187Ta/188Ta/189Ta/190Ta/191Ta/192Ta/193Ta/186W/187W/188W/189W/190W/191W/192W/193W/194W/187Re/188Re/189Re/190Re/191Re/192Re/193Re/194Re/195Re/196Re/190Os/191Os/192Os/193Os/194Os/195Os/196Os/197Os/192Ir/193Ir/194Ir/195Ir/196Ir/197Ir/198Ir, E=85 MeV/nucleon from the NSCL-MSU Coupled Cyclotron Facility (CCF); measured reaction products, particle identification spectra using A1900 fragment separator, S800 spectrograph for fragment analysis, PIN diode telescope of five silicon detectors for particle detection, γ rays using GRETINA array, and LISE+ Monte Carlo calculations of charge state fractions; deduced production cross sections of about 70 nuclei in Z=70-77 region. 189Lu, 191,192Hf; deduced new nuclides. 190W; measured γ-ray spectrum from the emission of a 166-μs isomer. Comparison of measured production cross sections with theoretical calculations using EFAX3 and COFRA codes. Numerical values of production cross sections are listed in the Supplemental Material.

doi: 10.1103/PhysRevC.108.034608
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2023YA31      Phys.Rev. C 108, 065802 (2023)

I.T.Yandow, A.Abdullah-Smoot, G.Bollen, A.Hamaker, C.R.Nicoloff, D.Puentes, M.Redshaw, K.Gulyuz, Z.Meisel, W.-J.Ong, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, A.A.Valverde

Mass measurement of 27P to constrain type-I x-ray burst models and validate the isobaric multiplet mass equation for the A=27, T=3/2 isospin quartet

doi: 10.1103/PhysRevC.108.065802
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2022GA36      Phys.Rev. C 106, 065503 (2022)

M.H.Gamage, R.Bhandari, G.Bollen, N.D.Gamage, A.Hamaker, D.Puentes, M.Redshaw, R.Ringle, S.Schwarz, C.S.Sumithrarachchi, I.Yandow

Identification of a potential ultralow-Q-value electron-capture decay branch in 75Se via a precise Penning trap measurement of the mass of 75As

ATOMIC MASSES 75As; measured cyclotron frequency; deduced mass excess. Ramsey TOF-ICR technique. Comparison to AME2020 and previous experimental values. Penning trap at LEBIT facility (FRIB).

RADIOACTIVITY 75Se(EC), 75Ge(β-); deduced Q-values using new mass value of 75As. Comparison to other experimental data.

doi: 10.1103/PhysRevC.106.065503
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2022ME04      Phys.Rev. C 105, 025804 (2022)

Z.Meisel, A.Hamaker, G.Bollen, B.A.Brown, M.Eibach, K.Gulyuz, C.Izzo, C.Langer, F.Montes, W.-J.Ong, D.Puentes, M.Redshaw, R.Ringle, R.Sandler, H.Schatz, S.Schwarz, C.S.Sumithrarachchi, A.A.Valverde, I.T.Yandow

Improved nuclear physics near A=61 refines urca neutrino luminosities in accreted neutron star crusts

ATOMIC MASSES 61Zn; measured time of flight, cyclotron frequency; deduced mass excess. Compared with AME2020 results. Low Energy Beam and Ion Trap (LEBIT) facility at the NSCL.

NUCLEAR REACTIONS 61Zn, 60Cu(p, γ), T=0.10-10 GK; deduced Q from obtained new value for 61Zn atomic mass, astrophysical reaction rates. Computed neutrino luminosity from the mass number A = 61 urca cooling source in accreted neutron-star crusts. Comparison to NON-SMOKER, TALYS codes results.

doi: 10.1103/PhysRevC.105.025804
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2022PO06      Phys.Rev. C 106, 024312 (2022)

W.S.Porter, E.Dunling, E.Leistenschneider, J.Bergmann, G.Bollen, T.Dickel, K.A.Dietrich, A.Hamaker, Z.Hockenbery, C.Izzo, A.Jacobs, A.Javaji, B.Kootte, Y.Lan, I.Miskun, I.Mukul, T.Murbock, S.F.Paul, W.R.Plass, D.Puentes, M.Redshaw, M.P.Reiter, R.Ringle, J.Ringuette, R.Sandler, C.Scheidenberger, R.Silwal, R.Simpson, C.S.Sumithrarachchi, A.Teigelhofer, A.A.Valverde, R.Weil, I.T.Yandow, J.Dilling, A.A.Kwiatkowski

Investigating nuclear structure near N=32 and N=34: Precision mass measurements of neutron-rich Ca, Ti, and V isotopes

ATOMIC MASSES 54Ca, 52,54,55,56Ti, 54,55,56,57,58V; measured time-of-flight ion-cyclotron-resonances (ToF-ICR) using TRIUMF-TITAN multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS) and the NSCL(MSU)-LEBIT Penning trap mass spectrometer; deduced mass excesses. Comparison with evaluated data in AME2020, and with valence-space in-medium similarity renormalization group (VS-IMSRG) calculations. Systematics of S(2n) values in 46,47,48,49,50,51K, 47,48,49,50,51,52,53,54Ca, 48,49,50,51,52,53,54,55,56,57Sc, 49,50,51,52,53,54,55,56,57Sc, 49,50,51,52,53,54,55,56Ti, 50,51,52,53,54,55,56,57,58,59V, 51,52,53,54,55,56,57,58,59,60Cr.

doi: 10.1103/PhysRevC.106.024312
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2022PU01      Phys.Rev. C 106, L012801 (2022)

D.Puentes, Z.Meisel, G.Bollen, A.Hamaker, C.Langer, E.Leistenschneider, C.Nicoloff, W.-J.Ong, M.Redshaw, R.Ringle, C.S.Sumithrarachchi, J.Surbrook, A.A.Valverde, I.T.Yandow

High-precision mass measurement of 24Si and a refined determination of the rp process at the A=22 waiting point

ATOMIC MASSES 24Si; measured time-of-flight ion Ramsey cyclotron resonance using Low Energy Beam and Ion Trap (LEBIT) facility at NSCL-MSU; deduced precise mass excess of 24Si using and compared with evaluated data in AME2020, effect on the determination of the rp process at 22Mg waiting point. 24Si produced in 9Be(28Si, X), E=160 MeV/nucleon, followed by separation of fragments using A1900 separator, and magnetic dipole mass separator.

NUCLEAR REACTIONS 23Al(p, γ)24Si, T=0.1-1.1 GK; deduced astrophysical reaction rates using resonance levels in 24Si, spectroscopic factors, Γγ and Γp from experimental data and NUSHELLX shell-model calculations. Comparison with literature results for 23Al(p, γ)24Si, 22Mg(p, γ)23Al and 22Mg(α, p)25Al reactions. 22Mg(α, p), T=0.6-1.9 GK; deduced (α, p) flow as function of temperature, onset temperature of the (α, p) process at the 22Mg waiting point to a precision of 9%. Relevance to rp process.

doi: 10.1103/PhysRevC.106.L012801
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2022SO14      Phys.Rev.Lett. 129, 132501 (2022)

F.Sommer, K.Konig, D.M.Rossi, N.Everett, D.Garand, R.P.de Groote, J.D.Holt, P.Imgram, A.Incorvati, C.Kalman, A.Klose, J.Lantis, Y.Liu, A.J.Miller, K.Minamisono, T.Miyagi, W.Nazarewicz, W.Nortershauser, S.V.Pineda, R.Powel, P.-G.Reinhard, L.Renth, E.Romero-Romero, R.Roth, A.Schwenk, C.Sumithrarachchi, A.Teigelhofer

Charge Radii of 55, 56Ni Reveal a Surprisingly Similar Behavior at N=28 in Ca and Ni Isotopes

NUCLEAR MOMENTS 54,55,56,57,58,59,60Ni; measured frequencies; deduced Isotope shifts, differential ms charge radii, and absolute rms charge radii. Comparison with nuclear density functional theory (DFT) calculations. National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) and collinear laser spectroscopy (CLS) at the BECOLA facility.

doi: 10.1103/PhysRevLett.129.132501
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2021GA15      Phys.Rev.Lett. 126, 152701 (2021)

B.Gao, S.Giraud, K.A.Li, A.Sieverding, R.G.T.Zegers, X.Tang, J.Ash, Y.Ayyad-Limonge, D.Bazin, S.Biswas, B.A.Brown, J.Chen, M.DeNudt, P.Farris, J.M.Gabler, A.Gade, T.Ginter, M.Grinder, A.Heger, C.Hultquist, A.M.Hill, H.Iwasaki, E.Kwan, J.Li, B.Longfellow, C.Maher, F.Ndayisabye, S.Noji, J.Pereira, C.Qi, J.Rebenstock, A.Revel, D.Rhodes, A.Sanchez, J.Schmitt, C.Sumithrarachchi, B.H.Sun, D.Weisshaar

New 59Fe Stellar Decay Rate with Implications for the 60Fe Radioactivity in Massive Stars

NUCLEAR REACTIONS 59Co(t, 3He)59Fe, E=115 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, σ(θ), B(GT), β-decay rates. Comparison with stellar evolution calculations.

doi: 10.1103/PhysRevLett.126.152701
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2021GO10      Phys.Rev. C 103, 035803 (2021)

J.Gombas, P.A.DeYoung, A.Spyrou, A.C.Dombos, A.Algora, T.Baumann, B.Crider, J.Engel, T.Ginter, E.Kwan, S.N.Liddick, S.Lyons, F.Naqvi, E.M.Ney, J.Pereira, C.Prokop, W.Ong, S.Quinn, D.P.Scriven, A.Simon, C.Sumithrarachchi

β-decay feeding intensity distributions for 103, 104mNb

RADIOACTIVITY 103,104mNb(β-)[from 9Be(124Sn, X), E not given, followed by separation of fragments using A1900 separator at NSCL-MSU]; measured reaction products and particle identification plot from 9Be(124Sn, X), Eγ, Iγ, total absorption gamma spectra from the decays of 103Nb and 104mNb using Summing NaI(Tl) (SuN) detector at the NSCL-MSU; deduced Iβ feedings to levels in 103Mo and 104Mo, cumulative B(GT) values. Comparison to predictions of quasiparticle random-phase approximation (QRPA) model. Relevance to antineutrino studies of nuclear reactors, and astrophysical r process.

doi: 10.1103/PhysRevC.103.035803
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2021HA47      Nat.Phys. 17, 1408 (2021)

A.Hamaker, E.Leistenschneider, R.Jain, G.Bollen, S.A.Giuliani, K.Lund, W.Nazarewicz, L.Neufcourt, C.R.Nicoloff, D.Puentes, R.Ringle, C.S.Sumithrarachchi, I.T.Yandow

Precision mass measurement of lightweight self-conjugate nucleus 80Zr

ATOMIC MASSES 80,81,82,83Zr; measured time of flight, frequencies; deduced mass excesses, weighted average frequency ratio. Comparison with AME20. Low Energy Beam and Ion Trap (LEBIT) facility.

doi: 10.1038/s41567-021-01395-w
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2021LE02      Phys.Rev.Lett. 126, 042501 (2021)

E.Leistenschneider, E.Dunling, G.Bollen, B.A.Brown, J.Dilling, A.Hamaker, J.D.Holt, A.Jacobs, A.A.Kwiatkowski, T.Miyagi, W.S.Porter, D.Puentes, M.Redshaw, M.P.Reiter, R.Ringle, R.Sandler, C.S.Sumithrarachchi, A.A.Valverde, I.T.Yandow, TITAN Collaboration

Precision Mass Measurements of Neutron-Rich Scandium Isotopes Refine the Evolution of N = 32 and N = 34 Shell Closures

ATOMIC MASSES 50,51,52,53,54,55Sc; measured frequencies of cyclotron motion; deduced TOF-ICR spectrum, mass excess, mass ratios. Comparison with the AME2016 atomic mass evaluation data, predictions from both ab initio and phenomenological nuclear theories.

doi: 10.1103/PhysRevLett.126.042501
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2021SU04      Phys.Rev. C 103, 014323 (2021)

J.Surbrook, G.Bollen, M.Brodeur, A.Hamaker, D.Perez-Loureiro, D.Puentes, C.Nicoloff, M.Redshaw, R.Ringle, S.Schwarz, C.S.Sumithrarachchi, L.J.Sun, A.A.Valverde, A.C.C.Villari, C.Wrede, I.T.Yandow

First Penning trap mass measurement of 36Ca

ATOMIC MASSES 36Ca; measured masses of 36Ca+ and 36Ca2+ by the time-of-flight ion cyclotron resonance method using the LEBIT 9.4 T Penning-trap facility at NSCL-MSU; deduced mass excess and compared with AME2016 evaluation; interpreted result in the context of the isobaric multiplet mass equation (IMME) and a new ab initio derived calculation that extends the IMME with excellent agreement in the A=36, T=2 isobaric multiplet with the quadratic IMME, and only qualitative agreement with the generalized IMME (GIMME) predictions. Radioactive beam of 36Ca produced in 9Be(40Ca, X), E=140 MeV/nucleon at the Coupled Cyclotron Facility, followed by selection and purification by A1900 fragment separator.

doi: 10.1103/PhysRevC.103.014323
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2020BR12      Phys. Rev. Res. 2, 022035 (2020)

B.A.Brown, K.Minamisono, J.Piekarewicz, H.Hergert, D.Garand, A.Klose, K.Konig, J.D.Lantis, Y.Liu, B.Maass, A.J.Miller, W.Nortershauser, S.V.Pineda, R.C.Powel, D.M.Rossi, F.Sommer, C.Sumithrarachchi, A.Teigelhofer, J.Watkins, R.Wirth

Implications of the 36Ca-36S and 38Ca-38Ar difference in mirror charge radii on the neutron matter equation of state

NUCLEAR STRUCTURE 36Ca, 36S, 38Ca, 38Ar; analyzed available data; deduced differences in charge radii between mirror nuclei, the slope of the symmetry energy L at the nuclear saturation density. Comparison with theoretical calculations of charge radii, differences and symmetry energy.

doi: 10.1103/PhysRevResearch.2.022035
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2020CI04      Phys.Rev. C 101, 034305 (2020)

A.A.Ciemny, W.Dominik, T.Ginter, R.Grzywacz, Z.Janas, M.Kuich, C.Mazzocchi, M.Pfutzner, M.Pomorski, D.Bazin, T.Baumann, A.Bezbakh, B.P.Crider, M.Cwiok, S.Go, G.Kaminski, K.Kolos, A.Korgul, E.Kwan, S.Liddick, K.Miernik, S.V.Paulauskas, J.Pereira, T.Roginski, K.Rykaczewski, C.Sumithrarachchi, Y.Xiao, H.Schatz, P.Sarriguren

First identification of 58Zn β-delayed proton emission

RADIOACTIVITY 57,58Zn(β+), (β+p)[from 9Be(78Kr, X), followed by separation of fragments using A1900 separator]; measured reaction products, Ep, Ip, β-delayed proton branching ratio, half-life of 57Zn decay using the Warsaw Optical Time Projection Chamber (OTPC) with energy loss and time-of-flight method for particle identification at the NSCL-MSU facility. 58Cu; deduced levels, J, π, β+p branching ratios, B(GT) for 1+ states. Comparison with experimental B(GT) values from 58Ni(3He, t)58Cu reaction, and with QRPA calculations.

doi: 10.1103/PhysRevC.101.034305
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2020GA10      Phys.Rev. C 101, 044302 (2020)

P.E.Garrett, T.R.Rodriguez, A.Diaz Varela, K.L.Green, J.Bangay, A.Finlay, R.A.E.Austin, G.C.Ball, D.S.Bandyopadhyay, V.Bildstein, S.Colosimo, D.S.Cross, G.A.Demand, P.Finlay, A.B.Garnsworthy, G.F.Grinyer, G.Hackman, B.Jigmeddorj, J.Jolie, W.D.Kulp, K.G.Leach, A.C.Morton, J.N.Orce, C.J.Pearson, A.A.Phillips, A.J.Radich, E.T.Rand, M.A.Schumaker, C.E.Svensson, C.Sumithrarachchi, S.Triambak, N.Warr, J.Wong, J.L.Wood, S.W.Yates

Shape coexistence and multiparticle-multihole structures in 110, 112Cd

RADIOACTIVITY 110,112In(β+), (EC)[from Ta(p, X), E=500 MeV]; 112Ag(β-)[from Ta(p, X), E=500 MeV]; measured Eγ, Iγ, and γγ-coin using 8π HPGe detector array at TRIUMF-ISAC. 110,112Cd; deduced levels, J, π, branching ratios, B(E2), configurations. Comparison of experimental B(E2) values with beyond mean-field calculations. Discussed shape-coexisting intruder band and multiparticle-multihole proton excitations for the second, third and fourth excited 0+ levels of 110,112Cd.

NUCLEAR REACTIONS 110,112Cd(n, n'), E=2.1-3.4 MeV; analyzed earlier γ(θ) and DSAM data; deduced half-lives of excited states.

NUCLEAR STRUCTURE 110,112Cd; calculated levels, J, π, B(E2), collective wave function contours in the (β2, γ) plane for excited states using symmetry conserving configuration mixing method (SCCM), B(E2) by beyond mean-field method. Comparison with experimental data.

doi: 10.1103/PhysRevC.101.044302
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2019DO02      Phys.Rev. C 99, 015802 (2019)

A.C.Dombos, A.Spyrou, F.Naqvi, S.J.Quinn, S.N.Liddick, A.Algora, T.Baumann, J.Brett, B.P.Crider, P.A.DeYoung, T.Ginter, J.Gombas, E.Kwan, S.Lyons, W.-J.Ong, A.Palmisano, J.Pereira, C.J.Prokop, D.P.Scriven, A.Simon, M.K.Smith, C.S.Sumithrarachchi

β-decay half-lives of neutron-rich nuclides in the A=100--110 mass region

RADIOACTIVITY 99Y, 101,102Zr, 102m,103,104mNb, 109Tc(β-)[from 9Be(124Sn, X), E=120 MeV/nucleon, followed by separation of reaction products using A1900 fragment separator]; measured (implants)γ-coin, time-of-flight, total energy loss of fragments, and half-lives from (implants)γ-correlated decay curves using the implantation station installed inside the Summing NaI(Tl) (SuN) detector for the total absorption spectroscopy (TAS) technique at the NSCL-MSU facility. Comparison with previous experimental values; compiled measured and evaluated half-lives in literature for the seven isotopes studied in this work. Relevance to B(GT) distributions, nuclear astrophysics, nuclear structure, and nuclear technology.

doi: 10.1103/PhysRevC.99.015802
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2019GA28      Phys.Rev.Lett. 123, 142502 (2019)

P.E.Garrett, T.R.Rodriguez, A.Diaz Varela, K.L.Green, J.Bangay, A.Finlay, R.A.E.Austin, G.C.Ball, D.S.Bandyopadhyay, V.Bildstein, S.Colosimo, D.S.Cross, G.A.Demand, P.Finlay, A.B.Garnsworthy, G.F.Grinyer, G.Hackman, B.Jigmeddorj, J.Jolie, W.D.Kulp, K.G.Leach, A.C.Morton, J.N.Orce, C.J.Pearson, A.A.Phillips, A.J.Radich, E.T.Rand, M.A.Schumaker, C.E.Svensson, C.Sumithrarachchi, S.Triambak, N.Warr, J.Wong, J.L.Wood, S.W.Yates

Multiple Shape Coexistence in 110, 112Cd

RADIOACTIVITY 110,112In(β+), (EC), 112Ag(β-); measured decay products, Eγ, Iγ; deduced γ-ray energies, weak decay branches from nonyrast states.

NUCLEAR REACTIONS 110,112Cd(n, n'), E not given; measured reaction products, Eγ, Iγ; deduced γ-ray energies, branching ratios and level T1/2, intruder γ-bands. The Doppler-shift attenuation method, comparison with Monte Carlo shell model (MCSM) calculations.

doi: 10.1103/PhysRevLett.123.142502
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2019KL06      Phys.Rev. C 99, 061301 (2019)

A.Klose, K.Minamisono, A.J.Miller, B.A.Brown, D.Garand, J.D.Holt, J.D.Lantis, Y.Liu, B.Maass, W.Nortershauser, S.V.Pineda, D.M.Rossi, A.Schwenk, F.Sommer, C.Sumithrarachchi, A.Teigelhofer, J.Watkins

Ground-state electromagnetic moments of 37Ca

NUCLEAR MOMENTS 37,39Ca; measured hyperfine structure spectra using the collinear laser spectroscopy technique at NSCL-BECOLA facility; deduced hyperfine coupling constants, and isoscalar- and isovector-magnetic moment of the ground states. 37,39Ca produced in 9Be(40Ca, X), E=140 MeV/nucleon reaction, and separation of fragments using A1900 fragment separator at NSCL-MSU. Comparison with shell model calculations using the universal sd model-space Hamiltonians (USDA/B). Systematics of experimental and theoretical magnetic moments of ground states of 37,39Ca, 37Cl and 39K.

doi: 10.1103/PhysRevC.99.061301
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2019RE07      Phys.Rev. C 99, 065502 (2019)

B.M.Rebeiro, S.Triambak, P.Z.Mabika, P.Finlay, C.S.Sumithrarachchi, G.Hackman, G.C.Ball, P.E.Garrett, C.E.Svensson, D.S.Cross, R.Dunlop, A.B.Garnsworthy, R.Kshetri, J.N.Orce, M.R.Pearson, E.R.Tardiff, H.Al Falou, R.A.E.Austin, R.Churchman, M.K.Djongolov, R.D'Entremont, C.Kierans, L.Milovanovic, S.O'Hagan, S.Reeve, S.K.L.Sjue, S.J.Williams, S.S.Ntshangase

Precise branching ratio measurements in 19Ne β decay and fundamental tests of the weak interaction

RADIOACTIVITY 19Ne(β+)[from C, Si(p, X), E=500 MeV at TRIUMF facility]; measured Eγ, Iγ, electron spectra, βγ-coin using the 8π γ-ray spectrometer and SCEPTAR detector array at TRIUMF-ISAC facility. 19F; deduced levels, β+-branching ratios, precise β branch for superallowed ground-state to ground-state branch, Ft values, Vud element of the CKM quark-mixing matrix. Comparison with previous experimental results. Discussed implications for testing weak interaction symmetries.

doi: 10.1103/PhysRevC.99.065502
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2019SU25      Hyperfine Interactions 240, 65 (2019)

J.Surbrook, M.MacCormick, G.Bollen, M.Brodeur, M.Eibach, K.Gulyuz, A.Hamaker, C.Izzo, S.M.Lenzi, D.Puentes, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, P.Schury, N.Smirnova, C.Sumithrarachchi, A.A.Valverde, A.C.C.Villari, I.T.Yandow

Precision mass measurements of 44V and 44mV for nucleon-nucleon interaction studies

ATOMIC MASSES 44V, 44mV; measured frequencies, TOF; deduced masses. Penning trap mass spectrometry in the LEBIT 9.4 T Penning trap at the National Superconducting Cyclotron Laboratory at Michigan State University.

doi: 10.1007/s10751-019-1602-y
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2018IZ01      Phys.Rev. C 97, 014309 (2018)

C.Izzo, G.Bollen, M.Brodeur, M.Eibach, K.Gulyuz, J.D.Holt, J.M.Kelly, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, S.R.Stroberg, C.S.Sumithrarachchi, A.A.Valverde, A.C.C.Villari

Precision mass measurements of neutron-rich Co isotopes beyond N=40

ATOMIC MASSES 68,69Co; measured time-of-flight ion cyclotron resonances (TOF-ICR), mass excesses using LEBIT Penning trap system at NSCL-MSU facility. Comparison with AME-2016 values. Systematics of S(2n) values in N=36-44 Fe, Co, Ni and Cu nuclides. Discussed low- and high-spin isomers in 68Co and 69Co, and concluded the main contribution from the high-spin activities.

RADIOACTIVITY 68,69Co(β-)[from 9Be(76Ge, X), E=130 MeV/nucleon followed by fragment selection using A1900 fragment separator]; measured Eγ, Iγ from the decay of 68Co. 68,69Co; calculated levels, J, π by ab initio approach using the valence-space in-medium similarity renormalization group (VS-IMSRG) framework based on two-nucleon (NN) and three-nucleon (3N) forces from chiral effective field theory; discussed energy ordering of the ground state and isomer.

doi: 10.1103/PhysRevC.97.014309
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2018JA16      Phys.Rev. C 98, 044309 (2018)

D.S.Jamieson, P.E.Garrett, G.C.Ball, G.A.Demand, T.Faestermann, P.Finlay, K.L.Green, R.Hertenberger, K.G.Leach, A.A.Phillips, C.S.Sumithrarachchi, S.Triambak, H.-F.Wirth

Nuclear structure of 112Cd studied through the 111Cd (d-pol, p) reaction

NUCLEAR REACTIONS 111Cd(polarized d, p), E=22 MeV; measured E(p), I(p), differential σ(θ), and analyzing powers Ay(θ) using Q3D magnetic spectrograph and a position-sensitive cathode-strip detector for particle identification at the Maier-Leibnitz Laboratory in Garching. 112Cd; deduced levels, J, π, L-transfers, orbital assignments, two-quasineutron configurations, (2j+1) sum rule and spectroscopic factors. Comparison with DWBA and adiabatic distorted wave approximation (ADWA) calculations.

doi: 10.1103/PhysRevC.98.044309
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2018KU01      Phys.Lett. B 777, 250 (2018)

M.Kumar Raju, J.N.Orce, P.Navratil, G.C.Ball, T.E.Drake, S.Triambak, G.Hackman, C.J.Pearson, K.J.Abraham, E.H.Akakpo, H.Al Falou, R.Churchman, D.S.Cross, M.K.Djongolov, N.Erasmus, P.Finlay, A.B.Garnsworthy, P.E.Garrett, D.G.Jenkins, R.Kshetri, K.G.Leach, S.Masango, D.L.Mavela, C.V.Mehl, M.J.Mokgolobotho, C.Ngwetsheni, G.G.O'Neill, E.T.Rand, S.K.L.Sjue, C.S.Sumithrarachchi, C.E.Svensson, E.R.Tardiff, S.J.Williams, J.Wong

Reorientation-effect measurement of the first 2+ state in 12C: Confirmation of oblate deformation

NUCLEAR REACTIONS 194Pt(12C, 12C'), E=4.975 MeV/nucleon; measured reaction products, Eγ, Iγ. 12C; deduced γ-ray yields, B(E2) diagonal matrix element, oblate deformation. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2017.12.009
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2018ON01      Phys.Rev. C 98, 065803 (2018)

W.-J.Ong, A.A.Valverde, M.Brodeur, G.Bollen, M.Eibach, K.Gulyuz, A.Hamaker, C.Izzo, D.Puentes, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, J.Surbrook, A.C.C.Villari, I.T.Yandow

Mass measurement of 51Fe for the determination of the 51Fe(p, γ)52Co reaction rate

ATOMIC MASSES 51Fe; measured time of flight, cyclotron frequency ratios, and mass excess using the Penning trap of LEBIT-NSCL. 52Co; deduced S(p). Comparison with data in AME-2016 evaluation.

NUCLEAR REACTIONS 51Fe(p, γ), T9=0.1-10; calculated astrophysical reaction rates; deduced REACLIB fits at 0.1-10 GK.

NUCLEAR STRUCTURE 52Co; calculated levels in the unbound region from 1560 to 3989 keV, proton resonances, J, π, Γp, Γγ, spectroscopic factors, using shell model with the GXPF1A interaction.

doi: 10.1103/PhysRevC.98.065803
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2018VA01      Phys.Rev.Lett. 120, 032701 (2018)

A.A.Valverde, M.Brodeur, G.Bollen, M.Eibach, K.Gulyuz, A.Hamaker, C.Izzo, W.-J.Ong, D.Puentes, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, J.Surbrook, A.C.C.Villari, I.T.Yandow

High-Precision Mass Measurement of 56Cu and the Redirection of the rp-Process Flow

ATOMIC MASSES 56Cu; measured time-of-flight ion cyclotron resonance; deduced cyclotron frequency ratios, mass excess. Comparison with AME2016 and available data.

doi: 10.1103/PhysRevLett.120.032701
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2017MI19      Phys.Rev. C 96, 054314 (2017)

A.J.Miller, K.Minamisono, D.M.Rossi, R.Beerwerth, B.A.Brown, S.Fritzsche, D.Garand, A.Klose, Y.Liu, B.Maass, P.F.Mantica, P.Muller, W.Nortershauser, M.R.Pearson, C.Sumithrarachchi

First determination of ground state electromagnetic moments of 53Fe

NUCLEAR MOMENTS 53Fe; measured hyperfine spectrum using bunched-beam collinear laser spectroscopy at the BECOLA facility at NSCL-MSU; deduced magnetic dipole moment, and electric quadrupole moment. Radioactive ion beam of 53Fe produced in 9Be(58Ni, X), E=160 MeV/nucleon, followed by fragment separation using A1900 separator. 53Co; deduced magnetic dipole moment from mirror magnetic moment systematics. Calculated electric field gradient using multiconfiguration Dirac-Fock (MCDF) method to deduce quadrupole moment. Comparison with shell-model calculations using the GXPF1A effective interaction in a full fp shell model space.

doi: 10.1103/PhysRevC.96.054314
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2017RA20      Eur.Phys.J. A 53, 184 (2017); Erratum Eur.Phys.J. A 54, 213 (2018)

A.J.Radich, P.E.Garrett, C.Andreoiu, G.C.Ball, L.Bianco, V.Bildstein, S.Chagnon-Lessard, D.S.Cross, G.A.Demand, A.Diaz Varela, R.Dunlop, P.Finlay, A.B.Garnsworthy, G.Hackman, B.Hadinia, B.Jigmeddorj, A.T.Laffoley, K.G.Leach, E.McGee, J.Michetti-Wilson, J.N.Orce, M.M.Rajabali, E.T.Rand, K.Starosta, C.S.Sumithrarachchi, C.E.Svensson, S.Triambak, Z.M.Wang, S.J.Williams, J.Wong, J.L Wood and S.W.Yates

New decay modes of the high-spin isomer of 124Cs

RADIOACTIVITY 124m,124Cs(IT), (β+);124Ba(β+); measured Eγ, Iγ, γγ-coin, X-rays, Eβ, Iβ, ee-coin. 124Xe[from Β+/EC-decay of 124mCs]; deduced levels, J, π, γ-ray transitions. 124mCs; deduced branching ratios for 16 levels populated in γ-decay of 7+ state.

doi: 10.1140/epja/i2017-12383-5
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2016CI01      Eur.Phys.J. A 52, 89 (2016)

A.A.Ciemny, W.Dominik, T.Ginter, R.Grzywacz, Z.Janas, M.Kuich, C.Mazzocchi, K.Miernik, M.Pfutzner, M.Pomorski, D.Bazin, T.Baumann, A.Bezbakh, B.P.Crider, M.Cwiok, S.Go, G.Kaminski, K.Kolos, A.Korgul, E.Kwan, S.N.Liddick, S.V.Paulauskas, J.Pereira, K.P.Rykaczewski, C.Sumithrarachchi, Y.Xiao

First measurement of 60Ge β-decay

RADIOACTIVITY 60Ge(β+)[from 78Kr+9Be fragmentation at 150 MeV/nucleon]; measured reaction products using OTPC (Optical Time Projection Chamber) plus GEM (Gas Electron Multiplier) for each βp decay event; deduced T1/2. Compared with Moeller measurement and with calculations using three different mass formulae.

doi: 10.1140/epja/i2016-16089-x
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2016DO05      Phys.Rev. C 93, 064317 (2016)

A.C.Dombos, D.-L.Fang, A.Spyrou, S.J.Quinn, A.Simon, B.A.Brown, K.Cooper, A.E.Gehring, S.N.Liddick, D.J.Morrissey, F.Naqvi, C.S.Sumithrarachchi, R.G.T.Zegers

Total absorption spectroscopy of the β decay of 76Ga

RADIOACTIVITY 76Ga(β-)[from 9Be(76Ge32+, X), E=130 MeV/nucleon and separated by A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, total absorption gamma-ray (TAS) spectrum using a segmented NaI(Tl)(SuN) detector, Eβ, Iβ by a silicon surface barrier, βγ-coin, half-life of 76Ga decay; deduced Iβ feedings and compared to the evaluated data in the ENSDF database, β strength functions and B(GT). Comparison with shell-model calculations using jj44b and JUN45 interactions. Relevance to studies of neutrinoless double β-decay of 76Ge.

doi: 10.1103/PhysRevC.93.064317
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2016GU02      Phys.Rev.Lett. 116, 012501 (2016)

K.Gulyuz, G.Bollen, M.Brodeur, R.A.Bryce, K.Cooper, M.Eibach, C.Izzo, E.Kwan, K.Manukyan, D.J.Morrissey, O.Naviliat-Cuncic, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, A.A.Valverde, A.C.C.Villari

High Precision Determination of the β Decay QEC Value of 11C and Implications on the Tests of the Standard Model

ATOMIC MASSES 11C, 10,11B; measured TOF ion cyclotron resonance spectra; deduced mass excess values. Comparison with AME2012 evaluation.

doi: 10.1103/PhysRevLett.116.012501
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2016JI02      Eur.Phys.J. A 52, 36 (2016)

B.Jigmeddorj, P.E.Garrett, A.Diaz Varela, G.C.Ball, J.C.Bangay, D.S.Cross, G.A.Demand, A.B.Garnsworthy, K.L.Green, G.Hackman, W.D.Kulp, K.G.Leach, J.N.Orce, E.T.Rand, C.Sumithrarachchi, C.E.Svensson, S.Triambak, J.Wong, J.L.Wood, S.W.Yates

Conversion electron study of 110Cd: Evidence of new E0 branches

RADIOACTIVITY 110In(β+), (EC); measured Eγ, Iγ, X-rays, Ee, Ie, (X-ray)e--coin, γe--coin, γγ-coin at TRIUMF-ISAC; deduced conversion electrons K, L subshell ratios, γ-transitions, multipolarity, levels, J, π, K-conversion electron lines, conversion coefficients, E2/M1 mixing ratio, ρ2(E0) for the 4+3 to 4+1 transition. Subshell E2, M1 ratios, conversion coefficients compared to published calculations. 110,112,114,116Cd deduced systematics for γ-transitions connecting intruder and gs bands.

doi: 10.1140/epja/i2016-16036-y
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2016MI27      Phys.Rev.Lett. 117, 252501 (2016)

K.Minamisono, D.M.Rossi, R.Beerwerth, S.Fritzsche, D.Garand, A.Klose, Y.Liu, B.Maass, P.F.Mantica, A.J.Miller, P.Muller, W.Nazarewicz, W.Nortershauser, E.Olsen, M.R.Pearson, P.-G.Reinhard, E.E.Saperstein, C.Sumithrarachchi, S.V.Tolokonnikov

Charge Radii of Neutron Deficient 52, 53Fe Produced by Projectile Fragmentation

NUCLEAR MOMENTS 52,53,56Fe; measured hyperfine spectra; deduced differential mean-square charge radii. Bunched-beam collinear laser spectroscopy, comparison with the nuclear density functional theory with Fayans and Skyrme energy density functionals calculations.

doi: 10.1103/PhysRevLett.117.252501
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2016WI03      Phys.Lett. B 759, 417 (2016)

G.L.Wilson, W.N.Catford, N.A.Orr, C.Aa.Diget, A.Matta, G.Hackman, S.J.Williams, I.C.Celik, N.L.Achouri, H.Al Falou, R.Ashley, R.A.E.Austin, G.C.Ball, J.C.Blackmon, A.J.Boston, H.C.Boston, S.M.Brown, D.S.Cross, M.Djongolov, T.E.Drake, U.Hager, S.P.Fox, B.R.Fulton, N.Galinski, A.B.Garnsworthy, D.Jamieson, R.Kanungo, K.G.Leach, J.N.Orce, C.J.Pearson, M.Porter-Peden, F.Sarazin, E.C.Simpson, S.Sjue, D.Smalley, C.Sumithrarachchi, S.Triambak, C.Unsworth, R.Wadsworth

Shell evolution approaching the N = 20 island of inversion: Structure of 26Na

NUCLEAR REACTIONS 2H(25Na, pγ)26Na, E=5 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ(θ), energy levels, J, π, level scheme. Comparison with available data.

doi: 10.1016/j.physletb.2016.05.093
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2015CA03      Acta Phys.Pol. B46, 527 (2015)

W.N.Catford, I.C.Celik, G.L.Wilson, A.Matta, N.A.Orr, C.Aa.Diget, P.Adsley, H.Al Falou, R.Ashley, R.A.E.Austin, G.C.Ball, J.C.Blackmon, A.J.Boston, H.C.Boston, S.M.Brown, D.S.Cross, M.Djongolov, T.E.Drake, U.Hager, S.P.Fox, B.R.Fulton, N.Galinski, A.B.Garnsworthy, G.Hackman, D.Jamieson, R.Kanungo, K.Leach, J-P.Martin, J.N.Orce, C.J.Pearson, M.Porter-Peden, F.Sarazin, S.Sjue, C.Sumithrarachchi, C.E.Svensson, S.Triambak, C.Unsworth, R.Wadsworth, S.J.Williams

Structure of 26Na via a Novel Technique Using (d, pγ) with a Radioactive 25Na Beam

NUCLEAR REACTIONS 2H(25Na, X)26Na, E not given; measured reaction products, Eγ, Iγ; deduced excited states, J, π.

doi: 10.5506/APhysPolB.46.527
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2015CI06      Phys.Rev. C 92, 014622 (2015)

A.A.Ciemny, W.Dominik, T.Ginter, R.Grzywacz, Z.Janas, M.Kuich, C.Mazzocchi, M.Pfutzner, M.Pomorski, F.Zarzynski, D.Bazin, T.Baumann, A.Bezbakh, B.P.Crider, M.Cwiok, S.Go, G.Kaminski, K.Kolos, A.Korgul, E.Kwan, S.Liddick, K.Miernik, S.V.Paulauskas, J.Pereira, K.Rykaczewski, C.Sumithrarachchi, Y.Xiao

First observation of 59Ge

NUCLEAR REACTIONS 9Be(78Kr, X)59Ge/60Ge/61Ge/62Ge, E=150 MeV/nucleon; measured production cross sections using A1900 separator and Optical Time Projection Chamber (OTPC) at NSCL-MSU facility; deduced new 59Ge isotope. Comparison with EPAX3 theoretical calculations. Relevance to 2p radioactivity.

doi: 10.1103/PhysRevC.92.014622
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2015EI01      Phys.Rev. C 92, 045502 (2015)

M.Eibach, G.Bollen, M.Brodeur, K.Cooper, K.Gulyuz, C.Izzo, D.J.Morrissey, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, A.A.Valverde, A.C.C.Villari

Determination of the QEC values of the T=1/2 mirror nuclei 21Na and 29P at LEBIT

ATOMIC MASSES 21Na, 29P; measured cyclotron frequency ratios of 21Ne, 21Na and 29P, 12C with TOF-ICR technique using LEBIT Penning trap mass spectrometer at NSCL-MSU; deduced Q(EC) values, Ft and Vud for 21Na and 29P decays. Comparison with previous experimental values and AME-2012.

RADIOACTIVITY 21Na, 29P(β+), (EC)[from 9Be(36Ar, X), E=150 MeV/nucleon using A1900 separator at NSCL-MSU]; measured Q(EC) using LEBIT Penning trap mass spectrometer. Comparison with previous experimental values.

doi: 10.1103/PhysRevC.92.045502
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2015RA05      Phys.Rev. C 91, 044320 (2015)

A.J.Radich, P.E.Garrett, J.M.Allmond, C.Andreoiu, G.C.Ball, L.Bianco, V.Bildstein, S.Chagnon-Lessard, D.S.Cross, G.A.Demand, A.Diaz Varela, R.Dunlop, P.Finlay, A.B.Garnsworthy, G.Hackman, B.Hadinia, B.Jigmeddorj, A.T.Laffoley, K.G.Leach, J.Michetti-Wilson, J.N.Orce, M.M.Rajabali, E.T.Rand, K.Starosta, C.S.Sumithrarachchi, C.E.Svensson, S.Triambak, Z.M.Wang, J.L.Wood, J.Wong, S.J.Williams, S.W.Yates

Ground-state and pairing-vibrational bands with equal quadrupole collectivity in 124Xe

RADIOACTIVITY 124Cs(β+), (EC)[from Ta(p, X), E=500 MeV]; measured Eγ, Iγ, γγ-coin using 8π array at TRIUMF-ISAC facility. 124Xe; deduced levels, J, π, B(E2) ratios, deformation parameters, proton-pairing vibrational band; analyzed previous Coulomb excitation data by GOSIA code. Comparison with interacting boson model (IBM) and dynamic-pairing plus quadrupole (DPPQ) model calculations. Systematics of energies and B(E2) values for 0+ and 2+ states in 120,122,124,126,128,130Xe.

doi: 10.1103/PhysRevC.91.044320
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2015RO12      Phys.Rev. C 92, 014305 (2015)

D.M.Rossi, K.Minamisono, H.B.Asberry, G.Bollen, B.A.Brown, K.Cooper, B.Isherwood, P.F.Mantica, A.Miller, D.J.Morrissey, R.Ringle, J.A.Rodriguez, C.A.Ryder, A.Smith, R.Strum, C.Sumithrarachchi

Charge radii of neutron-deficient 36K and 37K

ATOMIC PHYSICS 36,37K; measured hyperfine spectra using optical pumping and subsequent β-decay asymmetry detection at the BECOLA facility at NSCL-MSU facility; deduced atomic rate equations from resonance spectra, mean-square charge radii with reference to 39K. 36,37K radioactive beams produced in the fragmentation of 140 MeV/nucleon 40Ca ions with Be target, and separated by using A1900 fragment separator at NSCL-MSU. Comparison with Skyrme EDF and shell-model calculations, and with measured values of other K isotopes. Discussed absence of shell-closure at N=20 in the K isotopic chain due to a balance between the monopole and the quadrupole proton-core polarizations.

doi: 10.1103/PhysRevC.92.014305
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2015VA05      Phys.Rev. C 91, 037301 (2015)

A.A.Valverde, G.Bollen, K.Cooper, M.Eibach, K.Gulyuz, C.Izzo, D.J.Morrissey, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, A.C.C.Villari

Penning trap mass measurement of 72Br

ATOMIC MASSES 72,72mBr; measured time-of-flight cyclotron resonance, mass excess using Low Energy Beam and Ion Trap (LEBIT) Penning trap mass spectrometer at NSCL-MSU facility; deduced precise energy of the 72Br isomer. Comparison with AME-2012. 72Br and 72mBr produced in 9Be(78Kr, X), E=150 MeV/nucleon reaction.

doi: 10.1103/PhysRevC.91.037301
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2015VA08      Phys.Rev.Lett. 114, 232502 (2015)

A.A.Valverde, G.Bollen, M.Brodeur, R.A.Bryce, K.Cooper, M.Eibach, K.Gulyuz, C.Izzo, D.J.Morrissey, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, C.S.Sumithrarachchi, A.C.C.Villari

First Direct Determination of the Superallowed β-Decay QEC Value for 14O

RADIOACTIVITY 14O(EC), (β+) [from Be(16O, X)14O, E=150 MeV/nucleon]; measured time-of-flight cyclotron resonance, frequency ratios; deduced T1/2, ground-state Q-value, log ft. Comparison with available data.

doi: 10.1103/PhysRevLett.114.232502
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2014JA19      Phys.Rev. C 90, 054312 (2014)

D.S.Jamieson, P.E.Garrett, V.Bildstein, G.A.Demand, P.Finlay, K.L.Green, K.G.Leach, A.A.Phillips, C.S.Sumithrarachchi, C.E.Svensson, S.Triambak, G.C.Ball, T.Faestermann, R.Hertenberger, H.-F.Wirth

Quadrupole-octupole coupled states in 112Cd populated in the 111Cd(d(pol), p) reaction

NUCLEAR REACTIONS 111Cd(polarized d, p), E=22 MeV; measured E(p), I(p), σ(θ), vector analyzing powers Ay(θ) using Q3D magnetic spectrograph at TMU-Munich accelerator facility. 112Cd; deduced levels, L-transfers, J, π, B(E2), configurations, spectroscopic strength. DWBA and ADWA analysis of σ(θ) and Ay(θ) data. Comparison with other experimental results. Systematics of energies and B(E2) values for 5- and 6- states in 106,108,110,112,114,116,118,120,122,124Cd; and discussion of quadrupole-octupole (QOC) two-phonon quintuplet states.

doi: 10.1103/PhysRevC.90.054312
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2014SP05      Phys.Rev.Lett. 113, 232502 (2014)

A.Spyrou, S.N.Liddick, A.C.Larsen, M.Guttormsen, K.Cooper, A.C.Dombos, D.J.Morrissey, F.Naqvi, G.Perdikakis, S.J.Quinn, T.Renstrom, J.A.Rodriguez, A.Simon, C.S.Sumithrarachchi, R.G.T.Zegers

Novel technique for Constraining r-Process (n, γ) Reaction Rates

RADIOACTIVITY 76Ga(β-) [from Be(76Ge, X), E=130 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced nuclear level density and γ-ray strength function, restrictions on 75Ge(n, γ) reaction σ and rate. Hauser-Feshbach calculations.

doi: 10.1103/PhysRevLett.113.232502
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2013GR03      Phys.Rev. C 87, 045502 (2013)

G.F.Grinyer, G.C.Ball, H.Bouzomita, S.Ettenauer, P.Finlay, A.B.Garnsworthy, P.E.Garrett, K.L.Green, G.Hackman, J.R.Leslie, C.J.Pearson, E.T.Rand, C.S.Sumithrarachchi, C.E.Svensson, J.C.Thomas, S.Triambak, S.J.Williams

Improved half-life determination and β-delayed γ-ray spectroscopy for 18Ne decay

RADIOACTIVITY 18Ne(β+); measured Eγ, Iγ, Eβ, βγ-coin, T1/2 using 8π and SCEPTAR arrays at TRIUMF-ISAC facility; deduced β branching ratios. Comparison with previous experimental results for half-life. Superallowed β decay.

doi: 10.1103/PhysRevC.87.045502
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2013LE19      Phys.Rev. C 87, 064306 (2013); Pub.Note Phys.Rev. C 87, 069904 (2013)

K.G.Leach, P.E.Garrett, I.S.Towner, G.C.Ball, V.Bildstein, B.A.Brown, G.A.Demand, T.Faestermann, P.Finlay, K.L.Green, R.Hertenberger, R.Krucken, A.A.Phillips, E.T.Rand, C.S.Sumithrarachchi, C.E.Svensson, S.Triambak, H.-F.Wirth, J.Wong

Experimental 64Zn((d-pol), t)63Zn spectroscopic factors: Guidance for isospin-symmetry-breaking calculations

NUCLEAR REACTIONS 64Zn(polarized d, t), E=22 MeV; measured triton spectra, σ(θ) and vector analyzing powers using Q3D magnetic spectrograph at MLL, Munich facility. DWBA analyses using several optical model parameters. 63Zn; deduced levels, L-transfers, J, π, spectroscopic factors. Comparison with shell-model calculations with GXPF1A interaction. Comparison with experimental and theoretical spectroscopic factors for 62Zn(d, t)61Zn reaction. Discussed implications for isospin symmetry breaking (ISB) calculations for 62Ga to 62Zn superallowed β decay.

doi: 10.1103/PhysRevC.87.064306
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2013TA14      Phys.Rev. C 87, 054612 (2013)

O.B.Tarasov, M.Portillo, D.J.Morrissey, A.M.Amthor, L.Bandura, T.Baumann, D.Bazin, J.S.Berryman, B.A.Brown, G.Chubarian, N.Fukuda, A.Gade, T.N.Ginter, M.Hausmann, N.Inabe, T.Kubo, J.Pereira, B.M.Sherrill, A.Stolz, C.Sumithrarachchi, M.Thoennessen, D.Weisshaar

Production cross sections from 82Se fragmentation as indications of shell effects in neutron-rich isotopes close to the drip-line

NUCLEAR REACTIONS Be, W(82Se, X), E=139 MeV/nucleon; measured fragment spectra using A1900 fragment separator at NSCL facility. Z=11, A=27-33; Z=12, A=29-37; Z=13, A=31-39; Z=14, A=29-42; Z=15, A=31-45; Z=16, A=33-48; Z=17, A=35-50; Z=18, A=38-52; Z=19, A=39-55; Z=20, A=41-58; Z=21, A=43-61; Z=22, A=46-64; Z=23, A=47-67; Z=24, A=50-70; Z=25, A=52-72; Z=26, A=54-60; Z=26, A=63-75; Z=27, A=56-62; Z=27, A=65-76; Z=28, A=60-63; Z=28, A=67-78; Z=29, A=62-65; Z=29, A=70-78; Z=30, A=64-68; Z=30, A=73-80; Z=31, A=75-81; Z=32, A=79-82; Z=33, A=81-83; measured production cross sections for 334 isotopes, and longitudinal momentum distributions for 126 isotopes. 64Ti, 67V, 69,70Cr, 72Mn, 75Fe; measured production cross sections for isotopes first identified in this study. Comparison with calculations using abrasion-ablation model. Evidence for subshell closure at N=34 around Z=20.

doi: 10.1103/PhysRevC.87.054612
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2012FI06      Phys.Rev. C 85, 055501 (2012)

P.Finlay, G.C.Ball, J.R.Leslie, C.E.Svensson, C.Andreoiu, R.A.E.Austin, D.Bandyopadhyay, D.S.Cross, G.Demand, M.Djongolov, S.Ettenauer, P.E.Garrett, K.L.Green, G.F.Grinyer, G.Hackman, K.G.Leach, C.J.Pearson, A.A.Phillips, E.T.Rand, C.S.Sumithrarachchi, S.Triambak, S.J.Williams

High-precision branching-ratio measurement for the superallowed β+ emitter 26Alm

RADIOACTIVITY 26mAl(β+), (EC); measured Iβ, Eγ, Iγ, βγ-coin, βγ-anticoin at TRIUMF-ISAC facility; deduced upper limit for total non-superallowed β++EC branching ratio to excited states in 26Mg.

doi: 10.1103/PhysRevC.85.055501
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2012GA41      Phys.Rev. C 86, 044304 (2012)

P.E.Garrett, J.Bangay, A.Diaz Varela, G.C.Ball, D.S.Cross, G.A.Demand, P.Finlay, A.B.Garnsworthy, K.L.Green, G.Hackman, C.D.Hannant, B.Jigmeddorj, J.Jolie, W.D.Kulp, K.G.Leach, J.N.Orce, A.A.Phillips, A.J.Radich, E.T.Rand, M.A.Schumaker, C.E.Svensson, C.Sumithrarachchi, S.Triambak, N.Warr, J.Wong, J.L.Wood, S.W.Yates

Detailed spectroscopy of 110Cd: Evidence for weak mixing and the emergence of γ-soft behavior

NUCLEAR REACTIONS 110Cd(n, n'), E=2.1-3.4 MeV; analyzed Eγ, Iγ, γγ-coin, γ(θ), DSA data. 110Cd; deduced levels, J, π, half-lives, multipolarity, mixing ratio, B(E2).

RADIOACTIVITY 110In(β+), (EC)[from Ta(p, X), E=500 MeV]; measured Eγ, Iγ, γγ-, γe--coin, T1/2 at TRIUMF-ISAC facility. 110Cd; deduced levels, J, π, mixing ratio, B(E2). Systematics of low-lying 0+ levels and transition rates in 110,112,114,116Cd. No evidence for strong mixing of the intruder and nonintruder configurations. γ-soft or O(6)-type nucleus.

doi: 10.1103/PhysRevC.86.044304
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2012KW02      Phys.Rev. C 86, 014612 (2012)

E.Kwan, D.J.Morrissey, D.A.Davies, M.Steiner, C.S.Sumithrarachchi, L.Weissman

Systematic studies of light neutron-rich nuclei produced via the fragmentation of 40Ar

NUCLEAR REACTIONS 9Be, Ni, 181Ta(40Ar, X)10Be/11Be/12Be/12B/13B/14B/15B/14C/15C/16C/17C/18C/19C/16N/17N/18N/19N/20N/21N/22N/19O/20O/21O/22O/23O/24O/21F/22F/23F/24F/25F/26F/27F/24Ne/25Ne/26Ne/27Ne/28Ne/29Ne/30Ne/26Na/27Na/28Na/29Na/30Na/31Na/32Na/33Na/28Mg/29Mg/30Mg/31Mg/32Mg/33Mg/34Mg/35Mg/31Al/32Al/33Al/34Al/35Al/36Al/33Si/34Si/35Si/36Si/37Si/38Si/35P/36P/37P/38P, E=140 MeV/nucleon; measured fission fragment spectra by energy loss from time-of-flight measurements, average isobaric velocities, parallel momentum transfers, widths, fragment σ. Comparison with empirical formula EPAX, and predictions from internuclear cascade and deep inelastic models using Monte Carlo ISABEL-GEMINI and DIT-GEMINI computer codes.

doi: 10.1103/PhysRevC.86.014612
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2012OR05      Phys.Rev. C 86, 041303 (2012)

J.N.Orce, T.E.Drake, M.K.Djongolov, P.Navratil, S.Triambak, G.C.Ball, H.Al Falou, R.Churchman, D.S.Cross, P.Finlay, C.Forssen, A.B.Garnsworthy, P.E.Garrett, G.Hackman, A.B.Hayes, R.Kshetri, J.Lassen, K.G.Leach, R.Li, J.Meissner, C.J.Pearson, E.T.Rand, F.Sarazin, S.K.L.Sjue, M.A.Stoyer, C.S.Sumithrarachchi, C.E.Svensson, E.R.Tardiff, A.Teigelhoefer, S.J.Williams, J.Wong, C.Y.Wu

Reorientation-effect measurement of the (2+1 ll E2 ll 2+1) matrix element in 10Be

NUCLEAR REACTIONS 194Pt(10Be, 10Be'), E=41 MeV, [10Be beam from Ta(p, X), E=500 MeV]; measured Eγ, Iγ, particle spectra, (particle)γ-coin, angular distribution of γ yields for first 2+ states in 10Be and 194Pt using TIGRESS array at TRIUMF-ISACII facility. 10Be; deduced levels, J, π, diagonal matrix element for first 2+ state, spectroscopic quadrupole moment. 10Be, 194Pt; analyzed yield data using GOSIA code. Reorientation-effect in Coulomb-excitation. Comparison with shell-model (NCSM) calculations.

doi: 10.1103/PhysRevC.86.041303
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2012TR06      Phys.Rev.Lett. 109, 042301 (2012)

S.Triambak, P.Finlay, C.S.Sumithrarachchi, G.Hackman, G.C.Ball, P.E.Garrett, C.E.Svensson, D.S.Cross, A.B.Garnsworthy, R.Kshetri, J.N.Orce, M.R.Pearson, E.R.Tardiff, H.Al Falou, R.A.E.Austin, R.Churchman, M.K.Djongolov, R.D'Entremont, C.Kierans, L.Milovanovic, S.O'Hagan, S.Reeve, S.K.L.Sjue, S.J.Williams

High-Precision Measurement of the 19Ne Half-Life and Implications for Right-Handed Weak Currents

RADIOACTIVITY 19Ne(EC); measured reaction products, Eγ, Iγ; deduced T1/2, right-hand interaction. Comparison with available data.

doi: 10.1103/PhysRevLett.109.042301
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2011CR05      J.Instrum. 6, 08008 (2011)

D.S.Cross, G.C.Ball, P.E.Garrett, S.Triambak, S.J.Williams, C.Andreoiu, R.Churchman, A.B.Garnsworthy, G.Hackman, J.R.Leslie, J.N.Orce, C.S.Sumithrarachchi, C.E.Svensson

Commissioning the DANTE array of BaF2 detectors at TRIUMF-ISAC using a fast-timing lifetime measurement

RADIOACTIVITY 152Eu(EC); measured decay products, Eγ, Iγ; deduced 152Sm first excited state T1/2. Comparison with available data.

doi: 10.1088/1748-0221/6/08/p08008
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2011FI01      Phys.Rev.Lett. 106, 032501 (2011)

P.Finlay, S.Ettenauer, G.C.Ball, J.R.Leslie, C.E.Svensson, C.Andreoiu, R.A.E.Austin, D.Bandyopadhyay, D.S.Cross, G.Demand, M.Djongolov, P.E.Garrett, K.L.Green, G.F.Grinyer, G.Hackman, K.G.Leach, C.J.Pearson, A.A.Phillips, C.S.Sumithrarachchi, S.Triambak, S.J.Williams

High-Precision Half-Life Measurement for the Superallowed β+ Emitter 26Alm

RADIOACTIVITY 26Al(β+) [from Si(p, X), E=500 MeV]; measured decay products; deduced T1/2. Comparison with Skyrme-Hartree-Fock calculations.

COMPILATION 10C, 14O, 22Mg, 26Al, 34Cl, 34Ar, 38K, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb; compiled log ft values.

doi: 10.1103/PhysRevLett.106.032501
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2011LE47      J.Phys.:Conf.Ser. 312, 092036 (2011)

K.G.Leach, P.E.Garrett, G.C.Ball, J.C.Bangay, L.Bianco, G.A.Demand, T.Faestermann, P.Finlay, K.L.Green, R.Hertenberger, R.Kriicken, A.A.Phillips, E.T.Rand, C.S.Sumithrarachchi, C.E.Svensson, I.S.Towner, S.Triambak, H.-F.Wirth, J.Wong

Experimental Guidance of ISB Corrections via Direct Nuclear Reactions

NUCLEAR REACTIONS 64Zn(polarized d, d), (polarized d, t), E=22 MeV; measured Ep, Ip(θ), E(triton), I(triton, θ) using Q3D magnetic spectrograph; deduced elastic scattering σ(θ), vector analyzing power; calculated elastic scattering σ(θ), vector analyzing power using DWBA with isospin-symmetry breaking corrections and deuteron parameters from literature.

doi: 10.1088/1742-6596/312/9/092036
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2010SU03      Phys.Rev. C 81, 014302 (2010)

C.S.Sumithrarachchi, D.J.Morrissey, A.D.Davies, D.A.Davies, M.Facina, E.Kwan, P.F.Mantica, M.Portillo, Y.Shimbara, J.Stoker, R.R.Weerasiri

States in 22O via β decay of 22N

RADIOACTIVITY 22N(β-), (β-n), (β-2n)[from Be(48Ca, X), E=140 MeV/nucleon]; measured Eγ, Iγ, Eβ, Iβ, Eν, Iν, βγ-coin, half-lives, branching ratios; deduced logft. 20,21,22O; deduced levels, J, π, B(GT) values. Comparison with shell model calculations. Discussed halo structure and shell closure.

doi: 10.1103/PhysRevC.81.014302
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2009HU03      Phys.Lett. B 674, 168 (2009)

A.M.Hurst, C.Y.Wu, J.A.Becker, M.A.Stoyer, C.J.Pearson, G.Hackman, M.A.Schumaker, C.E.Svensson, R.A.E.Austin, G.C.Ball, D.Bandyopadhyay, C.J.Barton, A.J.Boston, H.C.Boston, R.Churchman, D.Cline, S.J.Colosimo, D.S.Cross, G.Demand, M.Djongolov, T.E.Drake, P.E.Garrett, C.Gray-Jones, K.L.Green, A.N.Grint, A.B.Hayes, K.G.Leach, W.D.Kulp, G.Lee, S.Lloyd, R.Maharaj, J.-P.Martin, B.A.Millar, S.Mythili, L.Nelson, P.J.Nolan, D.C.Oxley, E.Padilla-Rodal, A.A.Phillips, M.Porter-Peden, S.V.Rigby, F.Sarazin, C.S.Sumithrarachchi, S.Triambak, P.M.Walker, S.J.Williams, J.Wong, J.L.Wood

Narrowing of the neutron sd-pf shell gap in 29Na

NUCLEAR REACTIONS 110Pd(29Na, 29Na'), E=70 MeV; measured Eγ, Iγ, (particle)γ-coin, charged-particle spectra following Coulomb excitation; deduced σ. 29Na; deduced B(E2). Comparison with shell model.

doi: 10.1016/j.physletb.2009.03.017
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2009RI12      Phys.Rev. C 80, 064321 (2009)

R.Ringle, C.Bachelet, M.Block, G.Bollen, M.Facina, C.M.Folden III, C.Guenaut, A.A.Kwiatkowski, D.J.Morrissey, G.K.Pang, A.M.Prinke, J.Savory, P.Schury, S.Schwarz, C.S.Sumithrarachchi

High-precision Penning trap mass measurements of neutron-rich sulfur isotopes at the N=28 shell closure

ATOMIC MASSES 40,41,42,43,44S; measured precise mass excesses using LEBIT Penning trap mass spectrometer. Comparison with other recent mass measurements. Systematics of S(2n) values for N=24-30, Z=15-18 nuclides.

doi: 10.1103/PhysRevC.80.064321
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2009SA12      Phys.Rev.Lett. 102, 132501 (2009)

J.Savory, P.Schury, C.Bachelet, M.Block, G.Bollen, M.Facina, C.M.Folden III, C.Guenaut, E.Kwan, A.A.Kwiatkowski, D.J.Morrissey, G.K.Pang, A.Prinke, R.Ringle, H.Schatz, S.Schwarz, C.S.Sumithrarachchi

rp Process and Masses of N ∼ Z ∼ 34 Nuclides

ATOMIC MASSES 68,70Se, 70,71Br; measured frequencies using penning trap; deduced masses. 70,71Kr predicted masses.

doi: 10.1103/PhysRevLett.102.132501
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2007BO50      Eur.Phys.J. Special Topics 150, 337 (2007)

G.Bollen, C.Bachelet, M.Block, D.A.Davies, M.Facina, C.M.Folden, C.Guenaut, J.Huikari, E.Kwan, A.Kwiatowski, D.J.Morrissey, G.Pang, A.Prinke, R.Ringle, J.Savory, P.Schury, S.Schwarz, C.Sumithrarachchi, T.Sun

Penning trap mass measurements of rare isotopes produced by projectile fragmentation with LEBIT at NSCL

ATOMIC MASSES 80As, 81Se; measured masses a penning trap mass spectrometer.

doi: 10.1140/epjst/e2007-00340-3
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2007RI08      Phys.Rev. C 75, 055503 (2007)

R.Ringle, T.Sun, G.Bollen, D.Davies, M.Facina, J.Huikari, E.Kwan, D.J.Morrissey, A.Prinke, J.Savory, P.Schury, S.Schwarz, C.S.Sumithrarachchi

High-precision Penning trap mass measurements of 37, 38Ca and their contributions to conserved vector current and isobaric mass multiplet equation

ATOMIC MASSES 37,38Ca; measured masses using penning trap mass spectrometer. Deduced mass excess and implications on CVC and IMME.

doi: 10.1103/PhysRevC.75.055503
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2007SC24      Phys.Rev. C 75, 055801 (2007); Erratum Phys.Rev. C 80, 029905 (2009)

P.Schury, C.Bachelet, M.Block, G.Bollen, D.A.Davies, M.Facina, C.M.Folden III, C.Guenaut, J.Huikari, E.Kwan, A.Kwiatkowski, D.J.Morrissey, R.Ringle, G.K.Pang, A.Prinke, J.Savory, H.Schatz, S.Schwarz, C.S.Sumithrarachchi, T.Sun

Precision mass measurements of rare isotopes near N = Z = 33 produced by fast beam fragmentation

ATOMIC MASSES 63,64Ga, 64,65,66Ge, 66,67,68As, 69Se; measured masses using penning trap mass spectrometer. Astrophysical implications discussed.

doi: 10.1103/PhysRevC.75.055801
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2007SU05      Phys.Rev. C 75, 024305 (2007)

C.S.Sumithrarachchi, D.J.Morrissey, B.A.Brown, A.D.Davies, D.A.Davies, M.Fancina, E.Kwan, P.F.Mantica, M.Portillo, Y.Shimbara, J.Stoker, R.R.Weerasiri

Structure of 23F via β decay of 23O

RADIOACTIVITY 23O, 21N, 24F, 26Ne(β-) [from Be(48Ca, X)]; measured Eγ, Iγ, βγ-coin, T1/2. 23O(β-n); measured β-delayed neutron spectra; deduced neutron emission probability. 23F, 26Na deduced levels, J, π, β-feeding intensities.

doi: 10.1103/PhysRevC.75.024305
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2006BO11      Phys.Rev.Lett. 96, 152501 (2006)

G.Bollen, D.Davies, M.Facina, J.Huikari, E.Kwan, P.A.Lofy, D.J.Morrissey, A.Prinke, R.Ringle, J.Savory, P.Schury, S.Schwarz, C.Sumithrarachchi, T.Sun, L.Weissman

Experiments with Thermalized Rare Isotope Beams from Projectile Fragmentation: A Precision Mass Measurement of the Superallowed β Emitter 38Ca

ATOMIC MASSES 38Ca; measured mass. Penning trap mass spectrometer.

doi: 10.1103/PhysRevLett.96.152501
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2006RI15      Int.J. Mass Spectrom. 251, 300 (2006)

R.Ringle, P.Schury, T.Sun, G.Bollen, D.Davies, J.Huikari, E.Kwan, D.J.Morrissey, A.Prinke, J.Savory, S.Schwarz, C.Sumithrarachchi

Precision mass measurements with LEBIT at MSU

ATOMIC MASSES 78,80,82,83,84Kr; measured masses using the LEBIT Penning trap mass spectrometer. Comparison with 2003 mass evaluation.

doi: 10.1016/j.ijms.2006.02.011
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2006SU12      Phys.Rev. C 74, 024322 (2006)

C.S.Sumithrarachchi, D.W.Anthony, P.A.Lofy, D.J.Morrissey

β-delayed neutron decay of 19N and 20N

RADIOACTIVITY 19,20N(β-), (β-n) [from Be(22Ne, X)]; measured β-delayed En, Eγ, βγ-, nγ-, nβ-coin, T1/2; deduced β-emission and γ-emission probabilities, B(GT). 18,19,20O deduced levels, β-feeding intensities. Shell model analysis.

doi: 10.1103/PhysRevC.74.024322
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2005ST29      Phys.Lett. B 627, 32 (2005)

A.Stolz, T.Baumann, N.H.Frank, T.N.Ginter, G.W.Hitt, E.Kwan, M.Mocko, W.Peters, A.Schiller, C.S.Sumithrarachchi, M.Thoennessen

First observation of 60Ge and 64Se

NUCLEAR REACTIONS 9Be(78Kr, X)60Ge/61Ge/62Ge/63Ge/64Ge/64Se/65Se/66Se/67Se/68Se, E=140 MeV/nucleon; measured production σ, isotopic yields; deduced no evidence for 59Ga, 63As. 60Ge, 64Se deduced T1/2 lower limits. 59Ga, 63As deduced T1/2 upper limits.

doi: 10.1016/j.physletb.2005.08.130
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2005ST34      Eur.Phys.J. A 25, Supplement 1, 335 (2005)

A.Stolz, T.Baumann, N.H.Frank, T.N.Ginter, G.W.Hitt, E.Kwan, M.Mocko, W.Peters, A.Schiller, C.S.Sumithrarachchi, M.Thoennessen

Discovery of 60Ge and 64Se

NUCLEAR REACTIONS 9Be(78Kr, X)60Ge/61Ge/62Ge/63Ge/64Ge/64Se/65Se/66Se/67Se/68Se, E=140 MeV/nucleon; measured production σ, isotopic yields; deduced no evidence for 59Ga, 63As.

doi: 10.1140/epjad/i2005-06-192-y
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2003SU38      Nucl.Instrum.Methods Phys.Res. A505, 343 (2003)

C.S.Sumithrarachchi, K.Rengan, H.C.Griffin

Measurement of absolute gamma emission probabilities

RADIOACTIVITY 38Cl, 88Rb(β-); measured decay products, Eγ, Iγ; deduced γ-ray energies, emission probabilities, uncertainties. Comparison with experimental and evaluated data.

doi: 10.1016/S0168-9002(03)01093-3
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