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Start Over Author "ZGANJAR, E. F." Journal physical review letters
22 results on '"ZGANJAR, E. F."'

1. Impact of Modular Total Absorption Spectrometer measurements ofβdecay of fission products on the decay heat and reactorν¯eflux calculation

Author

Fijałkowska, A., primary, Karny, M., additional, Rykaczewski, K. P., additional, Rasco, B. C., additional, Grzywacz, R., additional, Gross, C. J., additional, Wolińska-Cichocka, M., additional, Goetz, K. C., additional, Stracener, D. W., additional, Bielewski, W., additional, Goans, R., additional, Hamilton, J. H., additional, Johnson, J. W., additional, Jost, C., additional, Madurga, M., additional, Miernik, K., additional, Miller, D., additional, Padgett, S. W., additional, Paulauskas, S. V., additional, Ramayya, A. V., additional, and Zganjar, E. F., additional

Published
2017
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2. Evidence for Gamow-Teller Decay ofNi78Core from Beta-Delayed Neutron Emission Studies

Author

Madurga, M., primary, Paulauskas, S. V., additional, Grzywacz, R., additional, Miller, D., additional, Bardayan, D. W., additional, Batchelder, J. C., additional, Brewer, N. T., additional, Cizewski, J. A., additional, Fijałkowska, A., additional, Gross, C. J., additional, Howard, M. E., additional, Ilyushkin, S. V., additional, Manning, B., additional, Matoš, M., additional, Mendez, A. J., additional, Miernik, K., additional, Padgett, S. W., additional, Peters, W. A., additional, Rasco, B. C., additional, Ratkiewicz, A., additional, Rykaczewski, K. P., additional, Stracener, D. W., additional, Wang, E. H., additional, Wolińska-Cichocka, M., additional, and Zganjar, E. F., additional

Published
2016
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3. Decays of the Three Top Contributors to the Reactorν¯eHigh-Energy Spectrum,Rb92,Y96gs, andCs142, Studied with Total Absorption Spectroscopy

Author

Rasco, B. C., primary, Wolińska-Cichocka, M., additional, Fijałkowska, A., additional, Rykaczewski, K. P., additional, Karny, M., additional, Grzywacz, R. K., additional, Goetz, K. C., additional, Gross, C. J., additional, Stracener, D. W., additional, Zganjar, E. F., additional, Batchelder, J. C., additional, Blackmon, J. C., additional, Brewer, N. T., additional, Go, S., additional, Heffron, B., additional, King, T., additional, Matta, J. T., additional, Miernik, K., additional, Nesaraja, C. D., additional, Paulauskas, S. V., additional, Rajabali, M. M., additional, Wang, E. H., additional, Winger, J. A., additional, Xiao, Y., additional, and Zachary, C. J., additional

Published
2016
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4. High-Precision Half-Life Measurements for the Superallowedβ+EmitterC10: Implications for Weak Scalar Currents

Author

Dunlop, M. R., primary, Svensson, C. E., additional, Ball, G. C., additional, Grinyer, G. F., additional, Leslie, J. R., additional, Andreoiu, C., additional, Austin, R. A. E., additional, Ballast, T., additional, Bender, P. C., additional, Bildstein, V., additional, Diaz Varela, A., additional, Dunlop, R., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Hackman, G., additional, Hadinia, B., additional, Jamieson, D. S., additional, Laffoley, A. T., additional, MacLean, A. D., additional, Miller, D. M., additional, Mills, W. J., additional, Park, J., additional, Radich, A. J., additional, Rajabali, M. M., additional, Rand, E. T., additional, Unsworth, C., additional, Valencik, A., additional, Wang, Z. M., additional, and Zganjar, E. F., additional

Published
2016
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5. Largeβ-Delayed One and Two Neutron Emission Rates in the Decay ofGa86

Author

Miernik, K., primary, Rykaczewski, K. P., additional, Gross, C. J., additional, Grzywacz, R., additional, Madurga, M., additional, Miller, D., additional, Batchelder, J. C., additional, Borzov, I. N., additional, Brewer, N. T., additional, Jost, C., additional, Korgul, A., additional, Mazzocchi, C., additional, Mendez, A. J., additional, Liu, Y., additional, Paulauskas, S. V., additional, Stracener, D. W., additional, Winger, J. A., additional, Wolińska-Cichocka, M., additional, and Zganjar, E. F., additional

Published
2013
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6. New Half-lives ofr-process Zn and Ga Isotopes Measured with Electromagnetic Separation

Author

Madurga, M., primary, Surman, R., additional, Borzov, I. N., additional, Grzywacz, R., additional, Rykaczewski, K. P., additional, Gross, C. J., additional, Miller, D., additional, Stracener, D. W., additional, Batchelder, J. C., additional, Brewer, N. T., additional, Cartegni, L., additional, Hamilton, J. H., additional, Hwang, J. K., additional, Liu, S. H., additional, Ilyushkin, S. V., additional, Jost, C., additional, Karny, M., additional, Korgul, A., additional, Królas, W., additional, Kuźniak, A., additional, Mazzocchi, C., additional, Mendez, A. J., additional, Miernik, K., additional, Padgett, S. W., additional, Paulauskas, S. V., additional, Ramayya, A. V., additional, Winger, J. A., additional, Wolińska-Cichocka, M., additional, and Zganjar, E. F., additional

Published
2012
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7. Largeβ-Delayed Neutron Emission Probabilities in theNi78Region

Author

Winger, J. A., primary, Ilyushkin, S. V., additional, Rykaczewski, K. P., additional, Gross, C. J., additional, Batchelder, J. C., additional, Goodin, C., additional, Grzywacz, R., additional, Hamilton, J. H., additional, Korgul, A., additional, Królas, W., additional, Liddick, S. N., additional, Mazzocchi, C., additional, Padgett, S., additional, Piechaczek, A., additional, Rajabali, M. M., additional, Shapira, D., additional, Zganjar, E. F., additional, and Borzov, I. N., additional

Published
2009
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8. Precision Branching Ratio Measurement for the Superallowedβ+EmitterGa62and Isospin-Symmetry-Breaking Corrections inA≥62Nuclei

Author

Hyland, B., primary, Svensson, C. E., additional, Ball, G. C., additional, Leslie, J. R., additional, Achtzehn, T., additional, Albers, D., additional, Andreoiu, C., additional, Bricault, P., additional, Churchman, R., additional, Cross, D., additional, Dombsky, M., additional, Finlay, P., additional, Garrett, P. E., additional, Geppert, C., additional, Grinyer, G. F., additional, Hackman, G., additional, Hanemaayer, V., additional, Lassen, J., additional, Lavoie, J. P., additional, Melconian, D., additional, Morton, A. C., additional, Pearson, C. J., additional, Pearson, M. R., additional, Phillips, A. A., additional, Schumaker, M. A., additional, Smith, M. B., additional, Towner, I. S., additional, Valiente-Dobón, J. J., additional, Wendt, K., additional, and Zganjar, E. F., additional

Published
2006
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9. Fine Structure in Proton Emission fromT145mDiscovered with Digital Signal Processing

Author

Karny, M., primary, Grzywacz, R. K., additional, Batchelder, J. C., additional, Bingham, C. R., additional, Gross, C. J., additional, Hagino, K., additional, Hamilton, J. H., additional, Janas, Z., additional, Kulp, W. D., additional, McConnell, J. W., additional, Momayezi, M., additional, Piechaczek, A., additional, Rykaczewski, K. P., additional, Semmes, P. A., additional, Tantawy, M. N., additional, Winger, J. A., additional, Yu, C. H., additional, and Zganjar, E. F., additional

Published
2003
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11. Half-Life Measurement for therp-Process Waiting Point NuclideZ80r

Author

Ressler, J. J., primary, Piechaczek, A., additional, Walters, W. B., additional, Aprahamian, A., additional, Wiescher, M., additional, Batchelder, J. C., additional, Bingham, C. R., additional, Brenner, D. S., additional, Ginter, T. N., additional, Gross, C. J., additional, Grzywacz, R., additional, Kulp, D., additional, MacDonald, B., additional, Reviol, W., additional, Rikovska, J., additional, Rykaczewski, K., additional, Winger, J. A., additional, and Zganjar, E. F., additional

Published
2000
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13. Crossing of Near-Spherical and Deformed Bands inHg186,188and new IsotopesTl186,188.

Author

Hamilton, J. H., primary, Ramayya, A. V., additional, Bosworth, E. L., additional, Lourens, W., additional, Cole, J. D., additional, Van Nooijen, B., additional, Garcia-Bermudez, G., additional, Martin, B., additional, Subba Rao, B. N., additional, Kawakami, H., additional, Riedinger, L. L., additional, Bingham, C. R., additional, Turner, F., additional, Zganjar, E. F., additional, Spejewski, E. H., additional, Carter, H. K., additional, Mlekodaj, R. L., additional, Schmidt-Ott, W. D., additional, Baker, K. R., additional, Fink, R. W., additional, Gowdy, G. M., additional, Wood, J. L., additional, Xenoulis, A., additional, Kern, B. D., additional, Hofstetter, K. J., additional, Weil, J. L., additional, Toth, K. S., additional, Ijaz, M. A., additional, and Sastry, K. S. R., additional

Published
1975
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15. Large β-Delayed One and Two Neutron Emission Rates in the Decay of 86Ga.

Author

Miernik, K., Rykaczewski, K. P., Gross, C. J., Grzywacz, R., Madurga, M., Miller, D., Batchelder, J. C., Borzov, I. N., Brewer, N. T., Jost, C., Korgul, A., Mazzocchi, C., Mendez II, A. J., Liu, Y., Paulauskas, S. V., Stracener, D. W., Winger, J. A., Wolinska-Cichocka, M., and Zganjar, E. F.

Subjects
*NEUTRON emission, *GALLIUM spectra, *RESONANCE ionization spectroscopy, *ELECTROMAGNETISM, *GERMANIUM isotopes
Abstract

Beta decay of 86Ga was studied by means of β-neutron-γ spectroscopy. An isotopically pure 86Ga beam was produced at the Holifield Radioactive Ion Beam Facility using a resonance ionization laser ion source and high-resolution electromagnetic separation. The decay of 86Ga revealed a half-life of 43-15+21 ms and large β-delayed one-neutron and two-neutron branching ratios of P1n=60(10)% and P2n=20(10)%. The βγ decay of 86Ga populated a 527 keV transition that is interpreted as the deexcitation of the first 2+ state in the N=54 isotone 86Ge and suggests a quick onset of deformation in Ge isotopes beyond N=50. [ABSTRACT FROM AUTHOR]

Published
2013
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16. Decays of the Three Top Contributors to the Reactor νe High-Energy Spectrum, 92Rb, 96gsY, and 142Cs, Studied with Total Absorption Spectroscopy.

Author

Rasco, B. C., Wolińska-Cichocka, M., Fijałkowska, A., Rykaczewski, K. P., Karny, M., Grzywacz, R. K., Goetz, K. C., Gross, C. J., Stracener, D. W., Zganjar, E. F., Batchelder, J. C., Blackmon, J. C., Brewer, N. T., Go, S., Heffron, B., King, T., Matta, J. T., Miernik, K., Nesaraja, C. D., and Paulauskas, S. V.

Subjects
*RUBIDIUM compounds, *PARTICLES (Nuclear physics), *NUCLEAR reactors
Abstract

We report total absorption spectroscopy measurements of 92Rb, 96gsY, and 142Cs β decays, which are the most important contributors to the high energy νe spectral shape in nuclear reactors. These three β decays contribute 43% of the νe flux near 5.5 MeV emitted by nuclear reactors. This νe energy is particularly interesting due to spectral features recently observed in several experiments including the Daya Bay, Double Chooz, and RENO Collaborations. Measurements were conducted at Oak Ridge National Laboratory by means of proton-induced fission of 238U with on-line mass separation of fission fragments and the Modular Total Absorption Spectrometer. We observe a β-decay pattern that is similar to recent measurements of 92Rb, with a ground-state to ground-state β feeding of 91(3)%. We verify the 96gsY ground-state to ground-state β feeding of 95.5(20)%. Our measurements substantially modify the β-decay feedings of 142Cs, reducing the β feeding to 142Ba states below 2 MeV by 32% when compared with the latest evaluations. Our results increase the discrepancy between the observed and the expected reactor νe flux between 5 and 7 MeV, the maximum excess increases from ~10% to ~12%. [ABSTRACT FROM AUTHOR]

Published
2016
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17. Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν[over ¯]_{e} flux calculation.

Author

Fijałkowska A, Karny M, Rykaczewski KP, Rasco BC, Grzywacz R, Gross CJ, Wolińska-Cichocka M, Goetz KC, Stracener DW, Bielewski W, Goans R, Hamilton JH, Johnson JW, Jost C, Madurga M, Miernik K, Miller D, Padgett SW, Paulauskas SV, Ramayya AV, and Zganjar EF

Abstract

We report the results of a β-decay study of fission products ^{86}Br, ^{89}Kr, ^{89}Rb, ^{90gs}Rb, ^{90m}Rb, ^{90}Kr, ^{92}Rb, ^{139}Xe, and ^{142}Cs performed with the Modular Total Absorption Spectrometer (MTAS) and on-line mass-separated ion beams. These radioactivities were assessed by the Nuclear Energy Agency as having high priority for decay heat analysis during a nuclear fuel cycle. We observe a substantial increase in β feeding to high excited states in all daughter isotopes in comparison to earlier data. This increases the average γ-ray energy emitted by the decay of fission fragments during the first 10 000 s after fission of ^{235}U and ^{239}Pu by approximately 2% and 1%, respectively, improving agreement between results of calculations and direct observations. New MTAS results reduce the reference reactor ν[over ¯]_{e} flux used to analyze reactor ν[over ¯]_{e} interaction with detector matter. The reduction determined by the ab initio method for the four nuclear fuel components, ^{235}U, ^{238}U, ^{239}Pu, and ^{241}Pu, amounts to 0.976, 0.986, 0.983, and 0.984, respectively.

Published
2017
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18. Evidence for Gamow-Teller Decay of ^{78}Ni Core from Beta-Delayed Neutron Emission Studies.

Author

Madurga M, Paulauskas SV, Grzywacz R, Miller D, Bardayan DW, Batchelder JC, Brewer NT, Cizewski JA, Fijałkowska A, Gross CJ, Howard ME, Ilyushkin SV, Manning B, Matoš M, Mendez AJ, Miernik K, Padgett SW, Peters WA, Rasco BC, Ratkiewicz A, Rykaczewski KP, Stracener DW, Wang EH, Wolińska-Cichocka M, and Zganjar EF

Abstract

The β-delayed neutron emission of ^{83,84}Ga isotopes was studied using the neutron time-of-flight technique. The measured neutron energy spectra showed emission from states at excitation energies high above the neutron separation energy and previously not observed in the β decay of midmass nuclei. The large decay strength deduced from the observed intense neutron emission is a signature of Gamow-Teller transformation. This observation was interpreted as evidence for allowed β decay to ^{78}Ni core-excited states in ^{83,84}Ge favored by shell effects. We developed shell model calculations in the proton fpg_{9/2} and neutron extended fpg_{9/2}+d_{5/2} valence space using realistic interactions that were used to understand measured β-decay lifetimes. We conclude that enhanced, concentrated β-decay strength for neutron-unbound states may be common for very neutron-rich nuclei. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models.

Published
2016
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19. High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents.

Author

Dunlop MR, Svensson CE, Ball GC, Grinyer GF, Leslie JR, Andreoiu C, Austin RA, Ballast T, Bender PC, Bildstein V, Diaz Varela A, Dunlop R, Garnsworthy AB, Garrett PE, Hackman G, Hadinia B, Jamieson DS, Laffoley AT, MacLean AD, Miller DM, Mills WJ, Park J, Radich AJ, Rajabali MM, Rand ET, Unsworth C, Valencik A, Wang ZM, and Zganjar EF

Abstract

Precision measurements of superallowed Fermi β-decay transitions, particularly for the lightest superallowed emitters ^{10}C and ^{14}O, set stringent limits on possible scalar current contributions to the weak interaction. In the present work, a discrepancy between recent measurements of the ^{10}C half-life is addressed through two high-precision half-life measurements, via γ-ray photopeak and β counting, that yield consistent results for the ^{10}C half-life of T_{1/2}=19.2969±0.0074  s and T_{1/2}=19.3009±0.0017  s, respectively. The latter is the most precise superallowed β-decay half-life measurement reported to date and the first to achieve a relative precision below 10^{-4}. A fit to the world superallowed β-decay data including the ^{10}C half-life measurements reported here yields b_{F}=-0.0018±0.0021 (68% C.L.) for the Fierz interference term and C_{S}/C_{V}=+0.0009±0.0011 for the ratio of the weak scalar to vector couplings assuming left-handed neutrinos.

Published
2016
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20. New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation.

Author

Madurga M, Surman R, Borzov IN, Grzywacz R, Rykaczewski KP, Gross CJ, Miller D, Stracener DW, Batchelder JC, Brewer NT, Cartegni L, Hamilton JH, Hwang JK, Liu SH, Ilyushkin SV, Jost C, Karny M, Korgul A, Królas W, Kuźniak A, Mazzocchi C, Mendez AJ 2nd, Miernik K, Padgett SW, Paulauskas SV, Ramayya AV, Winger JA, Wolińska-Cichocka M, and Zganjar EF

Abstract

The β decays of neutron-rich nuclei near the doubly magic (78)Ni were studied at the Holifield Radioactive Ion Beam Facility using an electromagnetic isobar separator. The half-lives of (82)Zn (228±10  ms), (83)Zn (117±20  ms), and (85)Ga (93±7  ms) were determined for the first time. These half-lives were found to be very different from the predictions of the global model used in astrophysical simulations. A new calculation was developed using the density functional model, which properly reproduced the new experimental values. The robustness of the new model in the (78)Ni region allowed us to extrapolate data for more neutron-rich isotopes. The revised analysis of the rapid neutron capture process in low entropy environments with our new set of measured and calculated half-lives shows a significant redistribution of predicted isobaric abundances strengthening the yield of A>140 nuclei.

Published
2012
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21. Large beta-delayed neutron emission probabilities in the 78Ni region.

Author

Winger JA, Ilyushkin SV, Rykaczewski KP, Gross CJ, Batchelder JC, Goodin C, Grzywacz R, Hamilton JH, Korgul A, Królas W, Liddick SN, Mazzocchi C, Padgett S, Piechaczek A, Rajabali MM, Shapira D, Zganjar EF, and Borzov IN

Abstract

The beta-delayed neutron branching ratios (P{betan}) for nuclei near doubly magic 78Ni have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital beta-gamma spectroscopy of 238U fission products. The P{betan} values for the very neutron-rich isotopes ;{76-78}Cu and 83Ga were found to be much higher than previously reported and predicted. Revised calculations of the betan process, accounting for new mass measurements and an inversion of the pi2p{3/2} and pi1f{5/2} orbitals, are in better agreement with these new experimental results.

Published
2009
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22. Precision branching ratio measurement for the superallowed beta+ emitter 62Ga and isospin-symmetry-breaking corrections in A>or=62 nuclei.

Author

Hyland B, Svensson CE, Ball GC, Leslie JR, Achtzehn T, Albers D, Andreoiu C, Bricault P, Churchman R, Cross D, Dombsky M, Finlay P, Garrett PE, Geppert C, Grinyer GF, Hackman G, Hanemaayer V, Lassen J, Lavoie JP, Melconian D, Morton AC, Pearson CJ, Pearson MR, Phillips AA, Schumaker MA, Smith MB, Towner IS, Valiente-Dobón JJ, Wendt K, and Zganjar EF

Abstract

A high-precision branching ratio measurement for the superallowed beta+ decay of 62Ga was performed at the Isotope Separator and Accelerator radioactive ion beam facility. Nineteen gamma rays emitted following beta+ decay of 62Ga were identified, establishing the dominant superallowed branching ratio to be (99.861+/-0.011)%. Combined with recent half-life and Q-value measurements, this branching ratio yields a superallowed ft value of 3075.6+/-1.4 s for 62Ga decay. These results demonstrate the feasibility of high-precision superallowed branching ratio measurements in the A>or=62 mass region and provide the first stringent tests of the large isospin-symmetry-breaking effects predicted for these decays.

Published
2006
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