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NSR database version of May 24, 2024.

Search: Author = L.Valdez

Found 7 matches.

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2015NO04      Phys.Rev. C 92, 024312 (2015)

S.Noji, R.G.T.Zegers, SamM.Austin, T.Baugher, D.Bazin, B.A.Brown, C.M.Campbell, A.L.Cole, H.J.Doster, A.Gade, C.J.Guess, S.Gupta, G.W.Hitt, C.Langer, S.Lipschutz, E.Lunderberg, R.Meharchand, Z.Meisel, G.Perdikakis, J.Pereira, F.Recchia, H.Schatz, M.Scott, S.R.Stroberg, C.Sullivan, L.Valdez, C.Walz, D.Weisshaar, S.J.Williams, K.Wimmer

Gamow-Teller transitions to 45Ca via the 45Sc (t, 3He+γ) reaction at 115 MeV/u and its application to stellar electron-capture rates

NUCLEAR REACTIONS 45Sc(t, 3He), E=115 MeV/nucleon, [triton beam from 9Be(16O, X), E=150 MeV/nucleon reaction]; measured 3He spectra, double-differential σ(θ), Eγ, Iγ, (particle)γ-coin using S800 spectrometer, cathode-readout drift chambers (CRDCs) and Gretina array at NSCL-MSU Coupled-Cyclotron facility. 45Ca; deduced levels, J, π, B(GT) strength functions, electron capture rates on 45Ca as function of stellar temperatures T9=8.5-10.5, poor agreement with shell-model calculations in the pf space and using GXPF1A, KB3G, and FPD6 interactions. Comparison of B(GT) with that from 45Ca g.s. to 45Sc g.s. β transition.

doi: 10.1103/PhysRevC.92.024312
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2179. Data from this article have been entered in the XUNDL database. For more information, click here.


2014NO05      Phys.Rev.Lett. 112, 252501 (2014)

S.Noji, R.G.T.Zegers, S.M.Austin, T.Baugher, D.Bazin, B.A.Brown, C.M.Campbell, A.L.Cole, H.J.Doster, A.Gade, C.J.Guess, S.Gupta, G.W.Hitt, C.Langer, S.Lipschutz, E.Lunderberg, R.Meharchand, Z.Meisel, G.Perdikakis, J.Pereira, F.Recchia, H.Schatz, M.Scott, S.R.Stroberg, C.Sullivan, L.Valdez, C.Walz, D.Weisshaar, S.Williams, K.Wimmer

β+ Gamow-Teller Transition Strengths from 46Ti and Stellar Electron-Capture Rates

RADIOACTIVITY 46Ti(β+), (EC) [from 46Ti(t, 3He), E=115 MeV/nucleon]; measured reaction and decay products, Eγ, Iγ; deduced σ(θ, E), Gamow-Teller transition strength, energy levels, J, π, electron capture decay rates. Comparison with shell model calculations using GXPF1A, KB3G, FPD6 interactions, QRPA calculations.

doi: 10.1103/PhysRevLett.112.252501
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2120. Data from this article have been entered in the XUNDL database. For more information, click here.


2014SC17      Phys.Rev. C 90, 025801 (2014)

M.Scott, Y.Shimbara, SamM.Austin, D.Bazin, B.A.Brown, J.M.Deaven, Y.Fujita, C.J.Guess, S.Gupta, G.W.Hitt, D.Koeppe, R.Meharchand, M.Nagashima, G.Perdikakis, A.Prinke, M.Sasano, C.Sullivan, L.Valdez, R.G.T.Zegers

Gamow-Teller transition strengths from 56Fe extracted from the 56Fe (t, 3He) reaction

NUCLEAR REACTIONS 56Fe(t, 3He), E=115 MeV/nucleon, [secondary triton beam from 9Be(16O, X), E=150 MeV/nucleon primary reaction]; measured 3He spectra, differential σ(θ) as function of excitation energy using S800 magnetic spectrograph at NSCL-MSU facility; deduced L-transfer, Gamow-Teller (GT) strength distribution, electron capture rates in 56Fe at astrophysical temperatures T9=2-10. DWBA analysis. Comparison with data from 56Fe(p, n), and with shell-model calculations in the pf-shell model space using the KB3G and GXPF1a interactions, and with calculations in the quasi-particle random-phase approximation (QRPA).

doi: 10.1103/PhysRevC.90.025801
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2130.


2012CO16      Phys.Rev. C 86, 015809 (2012)

A.L.Cole, T.S.Anderson, R.G.T.Zegers, S.M.Austin, B.A.Brown, L.Valdez, S.Gupta, G.W.Hitt, O.Fawwaz

Gamow-Teller strengths and electron-capture rates for pf-shell nuclei of relevance for late stellar evolution

NUCLEAR REACTIONS 45Sc, 48Ti, 51V, 54,56Fe, 55Mn, 59Co, 58,60,62,64Ni(n, p), E GE 100 MeV/nucleon; 48Ti, 50,51V, 58,64Ni, 64Zn(d, 2He), E GE 100 MeV/nucleon; 58Ni, 64Zn(t, 3He), E GE 100 MeV/nucleon; 60,62Ni(p, n), E GE 100 MeV/nucleon; calculated B(GT) distributions, and electron capture (EC) rates at relevant stellar temperatures and densities using shell-model with GXPF1a and KB3G effective interactions, and QRPA using ground-state deformation parameters and masses from the finite-range droplet model. Comparison with experimental data. Relevance to late stellar evolution.

RADIOACTIVITY 45Ca, 55Cr, 64Co, 64Cu(β-); calculated B(GT) strength distribution, EC rates using shell-model and QRPA. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.015809
Citations: PlumX Metrics


2012ME05      Phys.Rev.Lett. 108, 122501 (2012)

R.Meharchand, R.G.T.Zegers, B.A.Brown, Sam M.Austin, T.Baugher, D.Bazin, J.Deaven, A.Gade, G.F.Grinyer, C.J.Guess, M.E.Howard, H.Iwasaki, S.McDaniel, K.Meierbachtol, G.Perdikakis, J.Pereira, A.M.Prinke, A.Ratkiewicz, A.Signoracci, S.Stroberg, L.Valdez, P.Voss, K.A.Walsh, D.Weisshaar, and R.Winkler

Probing Configuration Mixing in 12Be with Gamow-Teller Transition Strengths

NUCLEAR REACTIONS Li(12B, 7Be)12Be, E=80 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ(θ), B(GT) transition strength, level energies, J, π. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.108.122501
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1910. Data from this article have been entered in the XUNDL database. For more information, click here.


2012SA37      Phys.Rev. C 86, 034324 (2012)

M.Sasano, G.Perdikakis, R.G.T.Zegers, SamM.Austin, D.Bazin, B.A.Brown, C.Caesar, A.L.Cole, J.M.Deaven, N.Ferrante, C.J.Guess, G.W.Hitt, M.Honma, R.Meharchand, F.Montes, J.Palardy, A.Prinke, L.A.Riley, H.Sakai, M.Scott, A.Stolz, T.Suzuki, L.Valdez, K.Yako

Extraction of Gamow-Teller strength distributions from 56Ni and 55Co via the (p, n) reaction in inverse kinematics

NUCLEAR REACTIONS 1H(55Co, n), E=106 MeV/nucleon; 1H(56Ni, n), E=110 MeV/nucleon, [55Co and 56Ni secondary beams from Be(58Ni, X), E=160 MeV/nucleon primary reaction]; measured E(n), I(n), neutron time of flight, differential σ(θ), excitation spectra using LENDA neutron detector array at NSCL facility. 55Co, 56Ni; deduced Gamow-Teller strengths in (p, n) reactions. Comparison with shell-model calculations in pf shell with KB3G and GXPF1J interactions. Be(58Ni, X)52Fe/53Fe/53Co/54Co/55Ni/55Co/56Ni/56Cu, E=160 MeV/nucleon; measured particle spectra, yields.

doi: 10.1103/PhysRevC.86.034324
Citations: PlumX Metrics


2011SA52      Phys.Rev.Lett. 107, 202501 (2011)

M.Sasano, G.Perdikakis, R.G.T.Zegers, Sam M.Austin, D.Bazin, B.A.Brown, C.Caesar, A.L.Cole, J.M.Deaven, N.Ferrante, C.J.Guess, G.W.Hitt, R.Meharchand, F.Montes, J.Palardy, A.Prinke, L.A.Riley, H.Sakai, M.Scott, A.Stolz, L.Valdez, K.Yako

Gamow-Teller Transition Strengths from 56Ni

NUCLEAR REACTIONS 1H(56Ni, n), E=110 MeV/nucleon; measured reaction products, En, In; deduced σ(θ, E), σ, Gamow-Teller strength distribution. Comparison with shell model calculations using KB3G and GXPF1A interactions.

RADIOACTIVITY 56Cu(p); measured decay products.

doi: 10.1103/PhysRevLett.107.202501
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1878. Data from this article have been entered in the XUNDL database. For more information, click here.


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