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NSR database version of April 11, 2024.

Search: Author = V.Horvat

Found 19 matches.

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2020HO10      Phys.Rev. C 102, 014310 (2020)

V.Horvat, E.E.Tereshatov, J.C.Hardy, N.Nica, C.M.Folden, V.E.Iacob, M.B.Trzhaskovskaya

K-shell internal conversion coefficient for M4 decay of the 30.8 keV isomer in 93Nb

RADIOACTIVITY 93Nb(IT); measured Eγ, Iγ, and K-shell conversion coefficient of the 30.76-keV M4 transition from the 30.76-keV, (1/2-) isomer using a Si(Li) detector for direct IT γ-ray and IC K-shell x-ray detection; deduced precise level energy of the isomer. Comparison with different theoretical models.

doi: 10.1103/PhysRevC.102.014310
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2020IA01      Phys.Rev. C 101, 015504 (2020)

V.E.Iacob, J.C.Hardy, H.I.Park, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen

New precise half-life measurement for the superallowed β+ emitter 34Ar

RADIOACTIVITY 34Ar(β+) [from 1H(35Cl, 2n), E=30 MeV/nucleon at the K500 superconducting cyclotron of Texas A and M University, followed by separation of fragments using the Momentum Achromat Recoil Spectrometer (MARS)]; measured Eβ, decay time spectrum, precise T1/2 of 34Ar decay using 4π proportional gas counter; deduced ft value for the superallowed β transition. Data analyzed as a linked parent-daughter pair. Discussed uncertainty budget. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.101.015504
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2020IA02      Phys.Rev. C 101, 045501 (2020)

V.E.Iacob, J.C.Hardy, H.I.Park, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen, I.S.Towner

Precise β branching-ratio measurement for the 0+ → 0+ superallowed decay of 34Ar

RADIOACTIVITY 34Ar(β+), (EC)[from 1H(35Cl, 2n), E=30 MeV/nucleon, followed by separation of fully stripped reaction ejectiles using the MARS spectrometer at the K500 superconducting cyclotron at Texas A and M University]; measured Eβ+, Iβ+, Eγ, Iγ, β+γ-coin. 34Cl; deduced levels, J, π, β-branching ratio, EC to β+ emission ratios, logft, superallowed 0+ to 0+ β transition, isospin-symmetry-breaking correction, ratios of ft values for the mirror pair of superallowed transitions 34Ar to 34Cl and 34Cl to 34S. Comparison with previous experimental data, and with shell model calculations with Woods-Saxon radial wave functions. Systematics of logft ratios in A=26, 34, 38 and 42 mirror pairs. Relevance to up-down quark-mixing element Vud of the Cabibbo-Kobayashi-Maskawa matrix.

doi: 10.1103/PhysRevC.101.045501
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2019BE23      Phys.Rev. C 100, 015503 (2019)

M.Bencomo, J.C.Hardy, V.E.Iacob, H.I.Park, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen, I.S.Towner

Precise branching ratio measurement for the superallowed β+ decay of 26Si: Completion of a second mirror pair

RADIOACTIVITY 26Si(β+), (EC)[from 1H(27Al, 2n), E=30 MeV/nucleon from the Texas A and M University K500 superconducting cyclotron, followed by analysis of reaction products by MARS system according to A/Q ratio]; measured β+ particles, Eγ, Iγ, β+γ-coin using plastic scintillator for β+ detection and HPGe detector for γ detection. 26Al; deduced levels, β++ϵ branching ratios, Gamow-Teller branches, superallowed (0+ to 0+) decay branch, logft, Ft. Comparison with sd shell-model calculations using USD, USD-A, and USD-B effective interactions. Discussed relevance to determination of up-down Vud quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix.

doi: 10.1103/PhysRevC.100.015503
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2018IA01      Phys.Rev. C 97, 035501 (2018)

V.E.Iacob, J.C.Hardy, L.Chen, V.Horvat, M.Bencomo, N.Nica, H.I.Park, B.T.Roeder, A.Saastamoinen

Precise half-life measurement of the superallowed emitter 30S

RADIOACTIVITY 30S(β+), (EC)[from 1H(31P, 2n), E=30 MeV/nucleon]; 30P(β+), (EC)[from 30S decay]; measured β+ using 4π proportional gas counter, half-lives of 30S and 30P decays. Comparison with previous measurements. Relevance to determination of up-down element of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix Vud for 0+ to 0+ superallowed β transition in the decay of 30S to 30P.

NUCLEAR REACTIONS 1H(31P, 2n)27Si/29P/30S/31S, E=30 MeV/nucleon; measured yields of ions momentum achromat recoil spectrometer (MARS) spectrometer at Texas A and M University K500 superconducting cyclotron facility.

doi: 10.1103/PhysRevC.97.035501
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2018NI14      Phys.Rev. C 98, 054321 (2018)

N.Nica, J.C.Hardy, V.E.Iacob, V.Horvat, H.I.Park, T.A.Werke, K.J.Glennon, C.M.Folden, V.I.Sabla, J.B.Bryant, X.K.James, M.B.Trzhaskovskaya

Precise measurement of αK andαT for the 39.8-keV E3 transition in 103Rh: Test of internal-conversion theory

RADIOACTIVITY 103Rh(IT)[from 103Ru(β-) produced in 102Ru(n, γ), and 103Pd(EC) produced in 102Pd(n, γ) at the TRIGA reactor of Texas A and M]; measured Eγ, Iγ, K-x rays, K-shell and total internal conversion coefficients; deduced M4 admixture and mixing ratio for the 39.8-keV isomeric transition in 103Rh. Comparison with Dirac-Fock calculations, and results disagree with the theory which ignores the K-shell atomic vacancy. 103Ru(β-)[from 102Ru(n, γ), E=thermal]; measured Eγ, Iγ; deduced K-x ray intensity using the known data for multipolarities and mixing ratios of non-isomeric transitions in 103Rh from the decay of 103Ru. Comparison with previous experimental γ-ray intensities in 103Ru decay.

doi: 10.1103/PhysRevC.98.054321
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2015PA32      Phys.Rev. C 92, 015502 (2015)

H.I.Park, J.C.Hardy, V.E.Iacob, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, E.McCleskey, R.E.Tribble, I.S.Towner

Precise measurement of branching ratios in the β decay of 38Ca

RADIOACTIVITY 38Ca(β+), (EC)[from 1H(39K, 2n), E=30 MeV/nucleon]; measured fully-stripped reaction ejectiles using Momentum Achromat Recoil Spectrometer (MARS) at Texas A and M cyclotron facility, Eβ, Iβ, Eγ, Iγ, β+γ-coin. 38K; deduced levels, J, π, β+ branching ratios, logft values, branching ratio and Ft value for superallowed β transition, the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix Vud. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.92.015502
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2014HA08      Appl.Radiat.Isot. 87, 297 (2014)

J.C.Hardy, V.E.Iacob, H.I.Park, L.Chen, N.Nica, V.Horvat, R.E.Tribble, I.S.Towner

FT values measured to ±0.1 percent for superallowed beta transitions: Metrology at sub-second time scales

RADIOACTIVITY 10C, 14O, 22Mg, 26Al, 34Cl, 34Ar, 38K, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb(EC); measured decay products, Eβ, Iβ, Eγ, Iγ; deduced log ft, T1/2 and their uncertainties. Comparison with theoretical calculations.

doi: 10.1016/j.apradiso.2013.11.018
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2014NI02      Phys.Rev. C 89, 014303 (2014)

N.Nica, J.C.Hardy, V.E.Iacob, M.Bencomo, V.Horvat, H.I.Park, M.Maguire, S.Miller, M.B.Trzhaskovskaya

Precise measurement of αK for the 65.7-keV M4 transition in 119Sn: Extended test of internal-conversion theory

RADIOACTIVITY 119Sn(IT)[from 118Sn(n, γ)]; measured Eγ, Iγ, E(x rays), I(x rays); deduced K-shell internal conversion coefficient of 65.7-keV M4 transition. Comparisons with theoretical conversion coefficient from Dirac-Fock relativistic calculation with and without K-shell atomic vacancy, and with previous measurements.Evidence of support for inclusion of atomic vacancy from comparison of precisely measured conversion coefficients with theoretical calculations for E2, E3 and M4 isomeric transitions in 20 cases including 119Sn, 134Cs, 137Ba, 193Ir and 197Pt.

doi: 10.1103/PhysRevC.89.014303
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2014PA09      Phys.Rev.Lett. 112, 102502 (2014)

H.I.Park, J.C.Hardy, V.E.Iacob, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, E.Simmons, R.E.Tribble, I.S.Towner

β Decay of 38Ca: Sensitive test of Isospin Symmetry-Breaking Corrections from Mirror Superallowed 0+ → 0+ Transitions

RADIOACTIVITY 38Ca, 38K(β+) [from 1H(39K, 2n)38Ca, E=30 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced branching ratio, high-precision log ft value. Test of the isospin symmetry-breaking corrections, comparison with available data.

doi: 10.1103/PhysRevLett.112.102502
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2013CH51      Nucl.Instrum.Methods Phys.Res. A728, 81 (2013)

L.Chen, J.C.Hardy, M.Bencomo, V.Horvat, N.Nica, H.I.Park

Digital beta counting and pulse-shape analysis for high-precision nuclear beta decay half-life measurements: Tested on 26Alm

RADIOACTIVITY 26Al(EC) [from H(27Al, X), E=23 MeV/nucleon]; measured decay products, Eβ, Iβ; deduced T1/2 and its uncertainty. Comparison with available data.

doi: 10.1016/j.nima.2013.06.039
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2011PA38      Phys.Rev. C 84, 065502 (2011)

H.I.Park, J.C.Hardy, V.E.Iacob, A.Banu, L.Chen, V.V.Golovko, J.Goodwin, V.Horvat, N.Nica, E.Simmons, L.Trache, R.E.Tribble

Precise half-life measurement of the superallowed β+ emitter 38Ca

RADIOACTIVITY 38Ca, 38mK(β+), (EC)[38Ca from 1H(39K, 2n), E=30 MeV/nucleon, 38K from 38Ca decay]; measured I(β+) using 4π proportional gas counter, half-life, data analyzed as a linked parent-daughter decay. Comparison with previous results. Superallowed β+ emitters.

doi: 10.1103/PhysRevC.84.065502
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2010IA01      Phys.Rev. C 82, 035502 (2010)

V.E.Iacob, J.C.Hardy, A.Banu, L.Chen, V.V.Golovko, J.Goodwin, V.Horvat, N.Nica, H.I.Park, L.Trache, R.E.Tribble

Precise half-life measurement of the superallowed β+ emitter 26Si

RADIOACTIVITY 26Si(β+)[from 1H(27Al, 2n), E=30 MeV/nucleon]; measured Eβ, Iβ using a 4π proportional gas counter system, and half-life. Comparison with previous results.

doi: 10.1103/PhysRevC.82.035502
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1992HO17      Phys.Rev. A46, 2572 (1992)

V.Horvat, G.Sampoll, K.Wohrer, M.Chabot, R.L.Watson

K-Shell Ionization of Intermediate-Z Elements by 30-MeV/amu H, N, Ne, and Ar Ions

NUCLEAR REACTIONS 27Al, Ti, Fe, Cu, Ge, Zr, Mo, Pd, Sn(p, X), (N, X), (Ne, X), (Ar, X), E=30 MeV/nucleon; measured K (X-ray) production σ, double K-shell ionization I X-ray.

ATOMIC PHYSICS 27Al, Ti, Fe, Cu, Ge, Zr, Mo, Pd, Sn(p, X), (N, X), (Ne, X), (Ar, X), E=30 MeV/nucleon; measured K (X-ray) production σ, double K-shell ionization I X-ray.

doi: 10.1103/PhysRevA.46.2572
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1991HO25      Nucl.Instrum.Methods Phys.Res. B56/57, 61 (1991)

V.Horvat, R.L.Watson, G.Sampoll, T.Lotze, B.Hill

K- Plus L-Shell Ionization of Fourth Row Elements by 30 MeV/amu Ar Ions

NUCLEAR REACTIONS Ti, V, Cr, Fe, 59Co, Ni, Cu, Zn(Ar, X), E=30 MeV/nucleon; measured K X-ray spectra; deduced double-to-single target K-shell ionization probabilities, single-, double K-shell vacancies relative probabilities.

ATOMIC PHYSICS Ti, V, Cr, Fe, 59Co, Ni, Cu, Zn(Ar, X), E=30 MeV/nucleon; measured K X-ray spectra; deduced double-to-single target K-shell ionization probabilities, single-, double K-shell vacancies relative probabilities.

doi: 10.1016/0168-583X(91)95971-F
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1990JE03      Fizika(Zagreb) 22, 413 (1990)

G.Jerbic-Zorc, K.Ilakovac, Z.Krecak, V.Horvat

Decay of the 514-keV Metastable State in 85Rb

RADIOACTIVITY 85Sr(EC); measured γγ-coin. 85Rb deduced level decay features, branching ratio.


1988IL01      Fizika(Zagreb) 20, 91 (1988)

K.Ilakovac, G.Jerbic-Zorc, M.Bozin, R.Pesic, V.Horvat

Search for Double-Photon Decay of the 109Ag Metastable State at 88 keV

RADIOACTIVITY 109Cd(EC); measured γ(K X-ray)-coin. 109Ag level deduced no double photon decay.


1985HO06      Phys.Rev. A31, 1543 (1985)

V.Horvat, K.Ilakovac

Decay of the Double-K-Shell-Vacancy State in Silver Atoms Created in the Decay of 109Cd

RADIOACTIVITY 109Cd(EC); measured I(K X-ray) ratios; deduced Ag atom double K-shell vacancy state.

doi: 10.1103/PhysRevA.31.1543
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1981VE17      Radiochem.Radioanal.Lett. 47, 35 (1981)

B.Vekic, L.Horvath, V.Horvat, M.Vlatkovic

Production of I-123 by Alpha-Bombardment of Natural Antimony

NUCLEAR REACTIONS 121Sb(α, 2n), E=26 MeV; measured 123I yield. Activation technique.


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