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174 results on '"FARRELLY, G."'

1. Total Absorption Spectroscopy Study of the Beta Decay of $^{86}$Br and $^{91}$Rb

Author

Rice, S., Algora, A., Tain, J. L., Valencia, E., Agramunt, J., Rubio, B., Gelletly, W., Regan, P. H., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kondev, F. G., Martínez, T., Mason, P., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs., Reponen, M., Sonnenschein, V., Sonzogni, A. A., and Sarriguren, P.

Subjects
Nuclear Experiment
Abstract

The beta decays of $^{86}$Br and $^{91}$Rb have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the IGISOL facility in Jyv\"askyl\"a and further purified using the JYFLTRAP. $^{86}$Br and $^{91}$Rb are considered to be major contributors to the decay heat in reactors. In addition $^{91}$Rb was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam {\it et al.} assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the {\it Pandemonium} effect and that the results of Rudstam {\it et al.} should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated., Comment: 11 pages, 13 figures

Published
2017
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2. Total Absorption Gamma-Ray Spectroscopy of 87Br, 88Br and 94Rb Beta-Delayed Neutron Emitters

Author

Valencia, E., Tain, J. L., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Aysto, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martinez, T., Mendoza, E., Moore, I., Penttila, H., Podolyak, Zs., Reponen, M., Sonnenschein, V., and Sonzogni, A. A.

Subjects
Nuclear Experiment
Abstract

We investigate the decay of 87Br, 88Br and 94Rb using total absorption gamma-ray spectroscopy. These important fission products are beta-delayed neutron emitters. Our data show considerable gamma-intensity, so far unobserved in high-resolution gamma-ray spectroscopy, from states at high excitation energy. We also find significant differences with the beta intensity that can be deduced from existing measurements of the beta spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1 to 100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for gamma emission from neutron unbound states populated in the daughter nucleus. The gamma branching is compared to Hauser-Feshbach calculations which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width by one order-of-magnitude. This leads to a similar increase in the calculated (n,gamma) cross section for this very neutron-rich nucleus with a potential impact on r-process abundance calculations.

Published
2016
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3. Enhanced Gamma-Ray Emission from Neutron Unbound States Populated in Beta Decay

Author

Tain, J. L., Valencia, E., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Aysto, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martinez, T., Mendoza, E., Moore, I., Penttila, H., Podolyak, Zs., Reponen, M., Sonnenschein, V., and Sonzogni, A. A.

Subjects
Nuclear Experiment
Abstract

Total absorption spectroscopy was used to investigate the beta-decay intensity to states above the neutron separation energy followed by gamma-ray emission in 87,88Br and 94Rb. Accurate results were obtained thanks to a careful control of systematic errors. An unexpectedly large gamma intensity was observed in all three cases extending well beyond the excitation energy region where neutron penetration is hindered by low neutron energy. The gamma branching as a function of excitation energy was compared to Hauser-Feshbach model calculations. For 87Br and 88Br the gamma branching reaches 57% and 20% respectively, and could be explained as a nuclear structure effect. Some of the states populated in the daughter can only decay through the emission of a large orbital angular momentum neutron with a strongly reduced barrier penetrability. In the case of neutron-rich 94Rb the observed 4.5% branching is much larger than the calculations performed with standard nuclear statistical model parameters, even after proper correction for fluctuation effects on individual transition widths. The difference can be reconciled introducing an enhancement of one order-of-magnitude in the photon strength to neutron strength ratio. An increase in the photon strength function of such magnitude for very neutron-rich nuclei, if it proved to be correct, leads to a similar increase in the (n,gamma) cross section that would have an impact on r-process abundance calculations.

Published
2015
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4. Total Absorption Spectroscopy Study of $^{92}$Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape

Author

Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Algora, A., Tain, J. L., Valencia, E., Rice, S., Bui, V. M, Cormon, S., Estienne, M., Agramunt, J., Äystö, J., Bowry, M., Briz, J. A., Caballero-Folch, R., Cano-Ott, D., Cucoanes, A., Elomaa, V. -V., Eronen, T., Estévez, E., Farrelly, G. F., Garcia, A. R., Gelletly, W., Gomez-Hornillos, M. B, Gorlychev, V., Hakala, J., Jokinen, A., Jordan, M. D., Kankainen, A., Karvonen, P., Kolhinen, V. S., Kondev, F. G, Martinez, T., Mendoza, E., Molina, F., Moore, I., Perez-Cerdán, A. B., Podolyák, Zs., Penttilä, H., Regan, P. H., Reponen, M., Rissanen, J., Rubio, B., Shiba, T., Sonzogni, A. A., Weber, C., and collaboration, IGISOL

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. $^{92}$Rb makes the dominant contribution to the reactor spectrum in the 5-8 MeV range but its decay properties are in question. We have studied $^{92}$Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed., Comment: 6 pages, 3 figures

Published
2015
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5. Core-coupled states and split proton-neutron quasi-particle multiplets in 122-126Ag

Author

Lalkovski, S., Bruce, A. M., Jungclaus, A., Gorska, M., Pfutzner, M., Caceres, L., Naqvi, F., Pietri, S., Podolyak, Zs., Simpson, G. S., Andgren, K., Bednarczyk, P., Beck, T., Benlliure, J., Benzoni, G., Casarejos, E., Cederwall, B., Crespi, F. C. L., Cuenca-Garcia, J. J., Cullen, I. J., Bacelar, A. M. Denis, Detistov, P., Doornenbal, P., Farrelly, G. F., Garnsworthy, A. B., Geissel, H., Gelletly, W., Gerl, J., Grebosz, J., Hadinia, B., Hellstrom, M., Hinke, C., Hoischen, R., Ilie, G., Jaworski, G., Jolie, J., Khaplanov, A., Kisyov, S., Kmiecik, M., Kojouharov, I., Kumar, R., Kurz, N., Maj, A., Mandal, S., Modamio, V., Montes, F., Myalski, S., Palacz, M., Prokopowicz, W., Reiter, P., Regan, P. H., Rudolph, D., Schaffner, H., Sohler, D., Steer, S. J., Tashenov, S., Walker, J., Walker, P. M., Weick, H., Werner-Malento, E., Wieland, O., Wollersheim, H. J., and Zhekova, M.

Subjects
Nuclear Experiment
Abstract

Neutron-rich silver isotopes were populated in the fragmentation of a 136Xe beam and the relativistic fission of 238U. The fragments were mass analyzed with the GSI Fragment separator and subsequently implanted into a passive stopper. Isomeric transitions were detected by 105 HPGe detectors. Eight isomeric states were observed in 122-126Ag nuclei. The level schemes of 122,123,125Ag were revised and extended with isomeric transitions being observed for the first time. The excited states in the odd-mass silver isotopes are interpreted as core-coupled states. The isomeric states in the even-mass silver isotopes are discussed in the framework of the proton-neutron split multiplets. The results of shell-model calculations, performed for the most neutron-rich silver nuclei are compared to the experimental data.

Published
2012
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6. Single-particle isomeric states in 121Pd and 117Ru

Author

Lalkovski, S., Bruce, A. M., Bacelar, A. M. Denis, Gorska, M., Pietri, S., Podolyak, Zs., Bednarczyk, P., Caceres, L., Casarejos, E., Cullen, I. J., Doornenbal, P., Farrelly, G. F., Garnsworthy, A. B., Geissel, H., Gelletly, W., Gerl, J., Grcebosz, J., Hinke, C., Ilie, G., Jaworski, G., Kisyov, S., Kojouharov, I., Kurz, N., Myalski, S., Palacz, M., Prokopowicz, W., Regan, P. H., Schaffner, H., Steer, S., Tashenov, S., Walker, P. M., Wollersheim, H. J., and Zhekova, M.

Subjects
Nuclear Experiment
Abstract

Neutron-rich nuclei were populated in a relativistic fission of 238U. Gamma-rays with energies of 135 keV and 184 keV were associated with two isomeric states in 121Pd and 117Ru. Half-lives of 0.63(5) microseconds and 2.0(3) micrisecondss were deduced and the isomeric states were interpreted in terms of deformed single-particle states.

Published
2011
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7. Clarifying the structure of low-lying states in Br-72

Author

Briz, J. A., Borge, M. J. G., Rubio, B., Agramunt, J., Algora, A., Deo, A. Y., Estévez Aguado, M. E., Farrelly, G., Fraile Prieto, Luis Mario, Gelletly, W., Maira, A., Nacher, E., Perea, A., Podolyak, Zs, Poves, A., Sarriguren, P., Tengblad, O., Briz, J. A., Borge, M. J. G., Rubio, B., Agramunt, J., Algora, A., Deo, A. Y., Estévez Aguado, M. E., Farrelly, G., Fraile Prieto, Luis Mario, Gelletly, W., Maira, A., Nacher, E., Perea, A., Podolyak, Zs, Poves, A., Sarriguren, P., and Tengblad, O.

Abstract

The authors of the IS370 collaboration want to acknowledge the support of the ISOLDE Collaboration and technical teams at CERN. J.A.B. acknowledges the predoctoral Grant No. BES-2008-009412 associated to the research Project No. FPA2007-62170 funded by Ministerio de Ciencia e Innovación (Spain) . This work has been partly supported by the Spanish Funding Agency for Research (AEI) through Projects No. FPA2017-87568-P, No. RTI2018-098868-B-I00, No. PGC2018-093636-B-I00, No. PID2019-104390GB-I00, and No. PID2019-104714GB-C21 and by STFC (UK) through Grant No. ST/P005314/1., The spins and parities of low-lying states in 72Br populated in the beta decay of 72Kr have been studied via conversion electron spectroscopy. The measurements were carried out at ISOLDE using a miniorange spectrometer with Si(Li) and HPGe detectors for electrons and gamma ray detection. Results of the conversion coefficients corresponding to transitions deexciting 12 levels in 72Br are reported. The multipolarities of the transitions are deduced and the spins and parities of the levels involved are discussed. From the multipolarities of the most intense transitions to the ground state, the spin and parity of the 72Br ground state have been definitely established as 1+. The spin of the 101.2-keV isomeric state is determined to be 3-. The level scheme is compared with mean-field and shell-model calculations and oblate deformation for the 72Br ground state is deduced. No E0 transitions have been found in 72Br. E0 transitions in the neighboring isobaric nuclei, 72Se and 72Ge, have also been studied., Ministerio de Ciencia e Innovación (MICINN), STFC (UK) UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC), Depto. de Estructura de la Materia, Física Térmica y Electrónica, Fac. de Ciencias Físicas, TRUE, pub

Published
2022

8. Clarifying the structure of low-lying states in Br72

Author

Briz, J. A., primary, Borge, M. J. G., additional, Rubio, B., additional, Agramunt, J., additional, Algora, A., additional, Deo, A. Y., additional, Estévez Aguado, M. E., additional, Farrelly, G., additional, Fraile, L. M., additional, Gelletly, W., additional, Maira, A., additional, Nácher, E., additional, Perea, A., additional, Podolyák, Zs., additional, Poves, A., additional, Sarriguren, P., additional, and Tengblad, O., additional

Published
2022
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9. The (6+) isomer in 102Sn revisited: Neutron and proton effective charges close to the double shell closure

Author

Grawe, H., Straub, K., Faestermann, T., Górska, M., Hinke, C., Krücken, R., Nowacki, F., Böhmer, M., Boutachkov, P., Geissel, H., Gernhäuser, R., Gottardo, A., Grȩbosz, J., Kurz, N., Liu, Z., Maier, L., Pietri, S., Podolyák, Zs., Steiger, K., Weick, H., Wollersheim, H.J., Woods, P.J., Al-Dahan, N., Alkhomashi, N., Ataç, A., Blazhev, A., Braun, N., Čeliković, I., Davinson, T., Dillmann, I., Domingo-Pardo, C., Doornenbal, P., Farrelly, G., Farinon, F., de France, G., Gerl, J., Goel, N., Habermann, T., Hoischen, R., Janik, R., Karny, M., Kaşkaş, A., Kojouharov, I., Kröll, Th., Lewitowicz, M., Litvinov, Yu.A., Myalski, S., Nebel, F., Nishimura, S., Nociforo, C., Nyberg, J., Parikh, A., Procházka, A., Regan, P.H., Rigollet, C., Schaffner, H., Scheidenberger, C., Schwertel, S., Söderström, P.-A., Steer, S., Stolz, A., and Strmeň, P.

Published
2021
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10. The (6 ) Isomer in Sn revisited: Neutron and proton effective charges close to the double shell closure

Author

Grawe, H., Straub, K., Faestermann, T., Górska, M., Hinke, C., Krücken, R., Nowacki, F., Böhmer, M., Boutachkov, P., Geissel, H., Gernhäuser, R., Gottardo, A., Grȩbosz, J., Kurz, N., Liu, Z., Maier, L., Pietri, S., Podolyák, Zs., Steiger, K., Weick, H., Wollersheim, H.J., Woods, P.J., Al-Dahan, N., Alkhomashi, N., Ataç, A., Blazhev, A., Braun, N., Čeliković, I., Davinson, T., Dillmann, I., Domingo-Pardo, C., Doornenbal, P., Farrelly, G., Farinon, F., de France, G., Gerl, J., Goel, N., Habermann, T., Hoischen, R., Janik, R., Karny, M., Kaşkaş, A., Kojouharov, I., Kröll, Th., Lewitowicz, M., Litvinov, Yu.A., Myalski, S., Nebel, F., Nishimura, S., Nociforo, C., Nyberg, J., Parikh, A., Procházka, A., Regan, P.H., Rigollet, C., Schaffner, H., Scheidenberger, C., Schwertel, S., Söderström, P.A., Steer, S., Stolz, A., and Strmeň, P.

Abstract

In a high-energy fragmentation experiment at GSI an I=π(6+) isomer and its γ-decay are identified in $^{102}$Sn, the two-neutron neighbour of the doubly-magic $^{100}$Sn. Its half-life is measured to be T=1/2367(11) ns. The possible existence of further isomers is discussed in the framework of large-scale shell model (LSSM) calculations including up to five particle-hole excitations of the $^{100}$Sn core. From the precise B(E2; 6+→4+) strength and the recently remeasured value for B(E2; 8+→6+) in the two-proton hole neighbour $^{98}$Cd effective E2 polarization charges for protons and neutrons were inferred including LSSM corrections within the full N=4 0ħω space. The results are discussed in comparison to predicted and empirically determined effective operators.

Published
2021

11. The (6(+)) isomer in Sn-102 revisited: Neutron and proton effective charges close to the double shell closure

Author

Grawe, H., Straub, K., Faestermann, T., Gorska, M., Hinke, C., Kruecken, R., Nowacki, F., Boehmer, M., Boutachkov, P., Geissel, H., Gernhaeuser, R., Gottardo, A., Grebosz, J., Kurz, N., Liu, Z., Maier, L., Pietri, S., Podolyak, Zs, Steiger, K., Weick, H., Wollersheim, H. J., Woods, P. J., Al-Dahan, N., Alkhomashi, N., Atac, A., Blazhev, A., Braun, N., Celikovic, I, Davinson, T., Dillmann, I, Domingo-Pardo, C., Doornenbal, P., Farrelly, G., Farinon, F., de France, G., Gerl, J., Goel, N., Habermann, T., Hoischen, R., Janik, R., Karny, M., Kaskas, A., Kojouharov, I, Kroell, Th, Lewitowicz, M., Litvinov, Yu A., Myalski, S., Nebel, F., Nishimura, S., Nociforo, C., Nyberg, J., Parikh, A., Prochazka, A., Regan, P. H., Rigollet, C., Schaffner, H., Scheidenberger, C., Schwertel, S., Soderstrom, P-A, Steer, S., Stolz, A., Strmen, P., Grawe, H., Straub, K., Faestermann, T., Gorska, M., Hinke, C., Kruecken, R., Nowacki, F., Boehmer, M., Boutachkov, P., Geissel, H., Gernhaeuser, R., Gottardo, A., Grebosz, J., Kurz, N., Liu, Z., Maier, L., Pietri, S., Podolyak, Zs, Steiger, K., Weick, H., Wollersheim, H. J., Woods, P. J., Al-Dahan, N., Alkhomashi, N., Atac, A., Blazhev, A., Braun, N., Celikovic, I, Davinson, T., Dillmann, I, Domingo-Pardo, C., Doornenbal, P., Farrelly, G., Farinon, F., de France, G., Gerl, J., Goel, N., Habermann, T., Hoischen, R., Janik, R., Karny, M., Kaskas, A., Kojouharov, I, Kroell, Th, Lewitowicz, M., Litvinov, Yu A., Myalski, S., Nebel, F., Nishimura, S., Nociforo, C., Nyberg, J., Parikh, A., Prochazka, A., Regan, P. H., Rigollet, C., Schaffner, H., Scheidenberger, C., Schwertel, S., Soderstrom, P-A, Steer, S., Stolz, A., and Strmen, P.

Abstract

In a high-energy fragmentation experiment at GSI an I-pi = (6(+)) isomer and its gamma-decay are identified in Sn-102, the two-neutron neighbour of the doubly-magic Sn-100. Its half-life is measured to be T-1/2 = 367(11) ns. The possible existence of further isomers is discussed in the framework of large-scale shell model (LSSM) calculations including up to five particle-hole excitations of the Sn-100 core. From the precise B(E2; 6(+) -> 4(+)) strength and the recently remeasured value for B(E2; 8(+) -> 6(+)) in the two-proton hole neighbour Cd-98 effective E2 polarization charges for protons and neutrons were inferred including LSSM corrections within the full N=4 0h omega space. The results are discussed in comparison to predicted and empirically determined effective operators. (C) 2021 The Author(s). Published by Elsevier B.V.

Published
2021

12. Electromagnetic properties of vibrational bands in 170Er

Author

DiJulio, D. D., Cederkall, J., Fahlander, C., Ekström, A., Golubev, P., Mattsson, K., Rudolph, D., de Angelis, G., Aydin, S., Y. Deo, A., Farnea, E., Farrelly, G., Geibel, K., He, C., Iwanicki, J., Kempley, R., Marginean, N., Menegazzo, R., Mengoni, D., Orlandi, R., Podolyak, Z., Recchia, F., Reiter, P., Sahin, E., Smith, J., Söderström, P. A., Torres, D. A., Tveten, G. M., Ur, C. A., Valiente-Dobón, J. J., Wendt, A., and Zielińska, M.

Published
2011
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13. Superallowed Gamow–Teller decay of the doubly magic nucleus 100Sn

Author

Hinke, C. B., Böhmer, M., Boutachkov, P., Faestermann, T., Geissel, H., Gerl, J., Gernhäuser, R., Górska, M., Gottardo, A., Grawe, H., Grębosz, J. L., Krücken, R., Kurz, N., Liu, Z., Maier, L., Nowacki, F., Pietri, S., Podolyák, Zs., Sieja, K., Steiger, K., Straub, K., Weick, H., Wollersheim, H.-J., Woods, P. J., Al-Dahan, N., Alkhomashi, N., Ataç, A., Blazhev, A., Braun, N. F., Čeliković, I. T., Davinson, T., Dillmann, I., Domingo-Pardo, C., Doornenbal, P. C., de France, G., Farrelly, G. F., Farinon, F., Goel, N., Habermann, T. C., Hoischen, R., Janik, R., Karny, M., Kaşkaş, A., Kojouharov, I. M., Kröll, Th., Litvinov, Y., Myalski, S., Nebel, F., Nishimura, S., Nociforo, C., Nyberg, J., Parikh, A. R., Procházka, A., Regan, P. H., Rigollet, C., Schaffner, H., Scheidenberger, C., Schwertel, S., Söderström, P.-A., Steer, S. J., Stolz, A., and Strmeň, P.

Published
2012
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14. New spectroscopic information on 211,213Tl : A changing structure beyond the N=126 shell closure

Author

Gottardo, A., Valiente-Dobón, J. J., Benzoni, G., Morales, A. I., Gadea, A., Lunardi, S., Boutachkov, P., Bruce, A. M., Górska, M., Grebosz, J., Pietri, S., Podolyak, Zs., Pfützner, M., Regan, P. H., Rudolph, D., Weick, H., Alcántara Núñez, J., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo-Pardo, C., Doncel, M., Dombradi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R. V., Reed, M. W., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P.M., Wieland, O., Wollersheim, H-J., Nowacki, F., and Maglione, E.

Subjects
isomeric decays, Nuclear Theory, Subatomic Physics, Physics::Atomic and Molecular Clusters, Nuclear Experiment, relativistic projectile fragmentation, gamma ray spectroscopy
Abstract

The neutron-rich isotopes 211;213Tl, beyond the N = 126 shell-closure, have been studied for the first time in isomer γ-ray decay, exploiting the fragmentation of a primary uranium beam at the FRS-RISING (FRagment Separator-Rare ISotopes INvestigation at GSI) setup at GSI. The observed isomeric states in 211;213Tl show a deviation from the seniority-like scheme of 209Tl. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.

Published
2019

15. New spectroscopic information on Tl 211,213: A changing structure beyond the N=126 shell closure

Author

Gottardo, A., Valiente-Dobón, J. J., Benzoni, G., Morales, Ana Isabel, Gadea, Andrés, Lunardi, S., Boutachkov, P., Bruce, A.M., Górska, M., Grebosz, J., Pietri, S., Podolyák, Z., Pfützner, M., Regan, P. H., Rudolph, D., Weick, H., Alcántara Núñez, J., Algora, Alejandro, Al-Dahan, N., De Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortés, M.L., Crespi, F.C.L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo Pardo, César, Doncel, M., Dombrádi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., and Generalitat Valenciana

Subjects
Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

The neutron-rich isotopes Tl211,213, beyond the N=126 shell closure, have been studied for the first time in isomer γ-ray decay, exploiting the fragmentation of a primary uranium beam at the Fragment Separator-Rare Isotopes Investigation at GSI setup. The observed isomeric states in Tl211,213 show a deviation from the seniority-like scheme of Tl209. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.

Published
2019

16. New spectroscopic information on $^{211 , 213}$Tl : A changing structure beyond the N = 126 shell closure

Author

Gottardo, A., Valiente-Dobón, J. J., Benzoni, G., Morales, A. I., Gadea, A., Lunardi, S., Boutachkov, P., Bruce, A. M., Górska, M., Grebosz, J., Pietri, S., Podolyák, Zs., Pfützner, M., Regan, P. H., Rudolph, D., Weick, H., Alcántara Núñez, J., Algora, A., Al-Dahan, N., De Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo-Pardo, C., Doncel, M., Dombradi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R. V., Reed, M. W., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., Wieland, O., Wollersheim, H-J., Nowacki, F., and Maglione, E.

Subjects
ddc:530
Abstract

Physical review / C covering nuclear physics 99(5), 054326 (2019). doi:10.1103/PhysRevC.99.054326, Published by Inst., Woodbury, NY

Published
2019
Full Text
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17. New spectroscopic information on Tl-211,Tl-213: A changing structure beyond the N=126 shell closure

Author

Gottardo, A., Valiente-Dobon, J. J., Benzoni, G., Morales, A., I, Gadea, A., Lunardi, S., Boutachkov, P., Bruce, A. M., Gorska, M., Grebosz, J., Pietri, S., Podolyak, Zs, Pfuetzner, M., Regan, P. H., Rudolph, D., Weick, H., Alcantara Nunez, J., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Bacelar, A. M. Denis, Deo, A. Y., Domingo-Pardo, C., Doncel, M., Dombradi, Zs, Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I, Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R., V, Reed, M. W., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I, Ur, C. A., Walker, P. M., Wieland, O., Wollersheim, H-J, Nowacki, F., Maglione, E., Gottardo, A., Valiente-Dobon, J. J., Benzoni, G., Morales, A., I, Gadea, A., Lunardi, S., Boutachkov, P., Bruce, A. M., Gorska, M., Grebosz, J., Pietri, S., Podolyak, Zs, Pfuetzner, M., Regan, P. H., Rudolph, D., Weick, H., Alcantara Nunez, J., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Bacelar, A. M. Denis, Deo, A. Y., Domingo-Pardo, C., Doncel, M., Dombradi, Zs, Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I, Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R., V, Reed, M. W., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I, Ur, C. A., Walker, P. M., Wieland, O., Wollersheim, H-J, Nowacki, F., and Maglione, E.

Abstract

The neutron-rich isotopes Tl-211,Tl-213, beyond the N = 126 shell closure, have been studied for the first time in isomer gamma-ray decay, exploiting the fragmentation of a primary uranium beam at the Fragment Separator-Rare Isotopes Investigation at GSI setup. The observed isomeric states in Tl-211,Tl-213 show a deviation from the seniority-like scheme of Tl-209. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.

Published
2019

18. New spectroscopic information on Tl211,213 : A changing structure beyond the N=126 shell closure

Author

Gottardo, A., Valiente-Dobón, J. J., Benzoni, G., Morales, A. I., Gadea, A., Lunardi, S., Boutachkov, P., Bruce, A. M., Górska, M., Grebosz, J., Pietri, S., Podolyák, Zs., Pfützner, M., Regan, P. H., Rudolph, D., Weick, H., Alcántara Núñez, J., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo-Pardo, C., Doncel, M., Dombradi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R. V., Reed, M. W., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., Wieland, O., Wollersheim, H-J., Nowacki, F., and Maglione, E.

Subjects
ddc
Published
2018

19. New spectroscopic information on Tl211,213 : A changing structure beyond the N=126 shell closure

Author

Gottardo, A., primary, Valiente-Dobón, J. J., additional, Benzoni, G., additional, Morales, A. I., additional, Gadea, A., additional, Lunardi, S., additional, Boutachkov, P., additional, Bruce, A. M., additional, Górska, M., additional, Grebosz, J., additional, Pietri, S., additional, Podolyák, Zs., additional, Pfützner, M., additional, Regan, P. H., additional, Rudolph, D., additional, Weick, H., additional, Alcántara Núñez, J., additional, Algora, A., additional, Al-Dahan, N., additional, de Angelis, G., additional, Ayyad, Y., additional, Alkhomashi, N., additional, Allegro, P. R. P., additional, Bazzacco, D., additional, Benlliure, J., additional, Bowry, M., additional, Bracco, A., additional, Bunce, M., additional, Camera, F., additional, Casarejos, E., additional, Cortes, M. L., additional, Crespi, F. C. L., additional, Corsi, A., additional, Denis Bacelar, A. M., additional, Deo, A. Y., additional, Domingo-Pardo, C., additional, Doncel, M., additional, Dombradi, Zs., additional, Engert, T., additional, Eppinger, K., additional, Farrelly, G. F., additional, Farinon, F., additional, Geissel, H., additional, Gerl, J., additional, Goel, N., additional, Gregor, E., additional, Habermann, T., additional, Hoischen, R., additional, Janik, R., additional, Klupp, S., additional, Kojouharov, I., additional, Kurz, N., additional, Lenzi, S. M., additional, Leoni, S., additional, Mandal, S., additional, Menegazzo, R., additional, Mengoni, D., additional, Million, B., additional, Napoli, D. R., additional, Naqvi, F., additional, Nociforo, C., additional, Prochazka, A., additional, Prokopowicz, W., additional, Recchia, F., additional, Ribas, R. V., additional, Reed, M. W., additional, Sahin, E., additional, Schaffner, H., additional, Sharma, A., additional, Sitar, B., additional, Siwal, D., additional, Steiger, K., additional, Strmen, P., additional, Swan, T. P. D., additional, Szarka, I., additional, Ur, C. A., additional, Walker, P. M., additional, Wieland, O., additional, Wollersheim, H-J., additional, Nowacki, F., additional, and Maglione, E., additional

Published
2019
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20. Total absorption spectroscopy study of the beta decay of Br-86 and Rb-91

Author

Rice, S., Algora, A., Tain, J. L., Valencia, E., Agramunt, J., Rubio, B., Gelletly, W., Regan, P. H., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ou, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martinez, T., Mason, P., Mendoza, E., Moore, I., Penttilä, H., Podolyak, Zs., Reponen, M., Sonnenschein, V., Sonzogni, A. A., Sarriguren, P., and Helsinki Institute of Physics

Subjects
PURIFICATION, SIMULATION, FISSION-PRODUCTS, JYFLTRAP, SPECTRA, DISTRIBUTIONS, High Energy Physics::Experiment, IGISOL, PENNING TRAP, Nuclear Experiment, GAMMA-RAY SPECTROMETER, NUCLEAR-LEVEL DENSITIES, 114 Physical sciences
Abstract

The beta decays of Br-86 and Rb-91 have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyvaskyla and further purified using the JYFLTRAP. Br-86 and Rb-91 are considered to be major contributors to the decay heat in reactors. In addition, Rb-91 was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decaywas well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated.

Published
2017

21. Total absorption spectroscopy study of the β decay of Br 86 and Rb 91

Author

Rice, S., Algora, A., Tain, J. L., Valencia, E., Agramunt, J., Rubio, B., Gelletly, W., Regan, P. H., Zakari-Issoufou, A. A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martínez, T., Mason, P., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs, Reponen, M., Sonnenschein, V., Sonzogni, A. A., Sarriguren, P., University of Surrey, University of Valencia, Université de Nantes, University of Jyväskylä, University of Helsinki, RAS - Saint Petersburg Nuclear Physics Institute, BarcelonaTech, CIEMAT, Department of Applied Physics, Argonne National Laboratory, Brookhaven National Laboratory, CSIC, Aalto-yliopisto, and Aalto University

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

The beta decays of Br86 and Rb91 have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyväskylä and further purified using the JYFLTRAP. Br86 and Rb91 are considered to be major contributors to the decay heat in reactors. In addition, Rb91 was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated.

Published
2017

22. Total Absorption Gamma-Ray Spectroscopy of the Beta-Delayed Neutron Emitters 87Br, 88Br and 94Rb

Author

Valencia, E., Tain, J. L., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, Muriel, Porta, Amanda, Rissanen, J., Eronen, T., Aysto, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martinez, T., Mendoza, E., Moore, I., Penttila, H., Podolyak, Zs., Reponen, M., Sonnenschein, V., Sonzogni, A. A., Laboratoire SUBATECH Nantes (SUBATECH), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; We investigate the decay of 87Br, 88Br and 94Rb using total absorption gamma-ray spectroscopy. These important fission products are beta-delayed neutron emitters. Our data show considerable gamma-intensity, so far unobserved in high-resolution gamma-ray spectroscopy, from states at high excitation energy. We also find significant differences with the beta intensity that can be deduced from existing measurements of the beta spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1 to 100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for gamma emission from neutron unbound states populated in the daughter nucleus. The gamma branching is compared to Hauser-Feshbach calculations which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width by one order-of-magnitude. This leads to a similar increase in the calculated (n,gamma) cross section for this very neutron-rich nucleus with a potential impact on r-process abundance calculations.

Published
2017

23. Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb

Author

Valencia, E., Tain, J. L., Algora, A., Agramunt, J., Estevez, E., Jordan, M. D., Rubio, B., Rice, S., Regan, P., Gelletly, W., Podolyák, Z., Bowry, M., Mason, P., Farrelly, G. F., Zakari-Issoufou, A., Fallot, M., Porta, A., Bui, V. M., Rissanen, Juho, Eronen, Tommi, Moore, Iain, Penttilä, Heikki, Äystö, Juha, Elomaa, Viki-Veikko, Hakala, Jani, Jokinen, Ari, Kolhinen, Veli, Reponen, Mikael, Sonnenschein, Volker, Cano-Ott, D., Garcia, A. R., Martínez, T., Mendoza, E., Caballero-Folch, R., Gomez-Hornillos, B., Gorlichev, V., Kondev, F. G., Sonzogni, A. A., and Batist, L.

Subjects
total absorption gamma-ray spectroscopy, rubidium, neutron emission, beta decay, bromi, Nuclear Experiment
Abstract

We investigate the decay of 87,88Br and 94Rb using total absorption γ -ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ -ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1–100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for γ emission from neutron unbound states populated in the daughter nucleus. The γ branching is compared to Hauser-Feshbach calculations, which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width γ by one order of magnitude. This increase in γ would lead to a similar increase in the calculated (n,γ ) cross section for this very neutron-rich nucleus with a potential impact on r process abundance calculations. peerReviewed

Published
2017

24. On the decay of the N = 126, 213Fr nucleus

Author

Pragati, Deo, AY, Podolyak, Zsolt, Walker, Philip, Algora, A, Rubio, B, Agramunt, J, Fraile, LM, Al-Dahan, N, Alkhomashi, N, Briz, JA, Estevez Aguado, ME, Farrelly, G, Gelletly, William, Herlert, A, Köster, U, and Maira, A

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Experiment
Abstract

Gamma rays following the EC= + and alpha decay of the N = 126, 213Fr nucleus have been observed at the CERN isotope separator on-line (ISOLDE) facility with the help of gamma-ray and conversion electron spectroscopy. These gamma rays establish several hitherto unknown excited states in 213Rn. Also, ve new -decay branches from the 213Fr ground state have been discovered. Shell model calculations have been performed to understand the newly observed states in 213Rn.

Published
2016

25. Decay of the $N=126, ^{213}$Fr nucleus

Author

Pragati, A., Deo, A.Y., Podolyák, Zs., Walker, P.M., Algora, A., Rubio, B., Agramunt, J., Fraile, L.M., Al-Dahan, N., Alkhomashi, N., Briz, J.A., Estevez Aguado, M.E., Farrelly, G., Gelletly, W., Herlert, A., Köster, U., Maira, A., Institut Laue-Langevin (ILL), and ILL

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; γ rays following the EC/β+ and α decay of the $N = 126, ^{213}$Fr nucleus have been observed at the CERN isotope separator on-line (ISOLDE) facility with the help of γ-ray and conversion-electron spectroscopy. These γ rays establish several hitherto unknown excited states in $^{213}$Rn. Also, five new α-decay branches from the $^{213}$Fr ground state have been discovered. Shell model calculations have been performed to understand the newly observed states in $^{213}$Fr.

Published
2016

26. Total absorption spectroscopy study of the β decay of Br86 and Rb91

Author

Rice, S., primary, Algora, A., additional, Tain, J. L., additional, Valencia, E., additional, Agramunt, J., additional, Rubio, B., additional, Gelletly, W., additional, Regan, P. H., additional, Zakari-Issoufou, A.-A., additional, Fallot, M., additional, Porta, A., additional, Rissanen, J., additional, Eronen, T., additional, Äystö, J., additional, Batist, L., additional, Bowry, M., additional, Bui, V. M., additional, Caballero-Folch, R., additional, Cano-Ott, D., additional, Elomaa, V.-V., additional, Estevez, E., additional, Farrelly, G. F., additional, Garcia, A. R., additional, Gomez-Hornillos, B., additional, Gorlychev, V., additional, Hakala, J., additional, Jordan, M. D., additional, Jokinen, A., additional, Kolhinen, V. S., additional, Kondev, F. G., additional, Martínez, T., additional, Mason, P., additional, Mendoza, E., additional, Moore, I., additional, Penttilä, H., additional, Podolyák, Zs., additional, Reponen, M., additional, Sonnenschein, V., additional, Sonzogni, A. A., additional, and Sarriguren, P., additional

Published
2017
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27. r Process (n, \(\gamma \)) Rate Constraints from the \(\gamma \) Emission of Neutron Unbound States in \(\beta \)-Decay

Author

Tain, J. L., primary, Guadilla, V., additional, Valencia, E., additional, Algora, A., additional, Zakari-Issoufou, A.-A., additional, Rice, S., additional, Agramunt, J., additional, Äystö, J., additional, Batist, L., additional, Bowry, M., additional, Briz, J. A., additional, Bui, V. M., additional, Caballero-Folch, R., additional, Cano-Ott, D., additional, Cucoanes, A., additional, Elomaa, V.-V., additional, Eronen, T., additional, Estevez, E., additional, Estienne, M., additional, Fallot, M., additional, Farrelly, G. F., additional, Fraile, L. M., additional, Ganioglu, E., additional, Garcia, A. R., additional, Gelletly, W., additional, Gómez-Hornillos, B., additional, Gorelov, D., additional, Gorlychev, V., additional, Hakala, J., additional, Jokinen, A., additional, Jordan, M. D., additional, Kankainen, A., additional, Kolhinen, V. S., additional, Kondev, F. G., additional, Koponen, J., additional, Lebois, M., additional, Le Meur, L., additional, Martínez, T., additional, Mason, P., additional, Mendoza, E., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Moore, I., additional, Nacher, E., additional, Orrigo, S. E. A., additional, Penttilä, H., additional, Podolyák, Zs., additional, Pohjalainen, I., additional, Porta, A., additional, Regan, P., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rissanen, J., additional, Rubio, B., additional, Rytkönen, K., additional, Shiba, T., additional, Sonnenschein, V., additional, Sonzogni, A. A., additional, Vedia, V., additional, Voss, A., additional, and Wilson, J. N., additional

Published
2017
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28. Total absorption γ -ray spectroscopy of the β -delayed neutron emitters Br87 , Br88 , and Rb94

Author

Valencia, E., primary, Tain, J. L., additional, Algora, A., additional, Agramunt, J., additional, Estevez, E., additional, Jordan, M. D., additional, Rubio, B., additional, Rice, S., additional, Regan, P., additional, Gelletly, W., additional, Podolyák, Z., additional, Bowry, M., additional, Mason, P., additional, Farrelly, G. F., additional, Zakari-Issoufou, A., additional, Fallot, M., additional, Porta, A., additional, Bui, V. M., additional, Rissanen, J., additional, Eronen, T., additional, Moore, I., additional, Penttilä, H., additional, Äystö, J., additional, Elomaa, V.-V., additional, Hakala, J., additional, Jokinen, A., additional, Kolhinen, V. S., additional, Reponen, M., additional, Sonnenschein, V., additional, Cano-Ott, D., additional, Garcia, A. R., additional, Martínez, T., additional, Mendoza, E., additional, Caballero-Folch, R., additional, Gomez-Hornillos, B., additional, Gorlichev, V., additional, Kondev, F. G., additional, Sonzogni, A. A., additional, and Batist, L., additional

Published
2017
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29. Total absorption spectroscopy study of $^{92}$Rb decay: a major contributor to reactor antineutrino flux

Author

Zakari-Issoufou, A. -A., Fallot, Muriel, Porta, Amanda, Algora, A., Tain, J. L., Valencia, E., Rice, S., Bui, Van Minh, Cormon, S., Estienne, Magali, Agramunt, J., Äystö, J., Bowry, M., Briz, J. A., Caballero-Folch, R., Cano-Ott, D., Cucoanes, A., Elomaa, V. -V., Eronen, T., Estévez, E., Farrelly, G. F., Garcia, A. R., Gelletly, W., Gomez-Hornillos, M. B, Gorlychev, V., Hakala, J., Jokinen, A., Jordan, M. D., Kankainen, A., Karvonen, P., Kolhinen, V. S., Kondev, F. G, Martinez, T., Mendoza, E., Molina, F., Moore, I., Perez, A., Podolyák, Zs., Penttilä, H., Regan, P. H., Reponen, M., Rissanen, J., Rubio, B., Shiba, T., Sonzogni, A. A., Weber, C., Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and IGISOL

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

6 pages, 3 figures; International audience; The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. $^{92}$Rb makes the dominant contribution to the reactor spectrum in the 5-8 MeV range but its decay properties are in question. We have studied $^{92}$Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.

Published
2015

30. Isomeric decay spectroscopy of the Bi-217 isotope

Author

Gottardo, Andrea, Valiente Dobon, J. J., Benzoni, G., Lunardi, Santo, Gadea, A., Algora, A., Al Dahan, N., de Angelis, G., Ayyad, Y., Bazzacco, D., Benlliure, J., Boutachkov, P., Bowry, M., Bracco, A., Bruce, A. M., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo Pardo, C., Doncel, M., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Farnea, E., Geissel, H., Gerl, J., Goel, N., G?rska, M., Grebosz, J., Gregor, E., Habermann, T., Hoischen, R., Janik, R., John, P. R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, SILVIA MONICA, Leoni, S., Mandal, S., Menegazzo, R., Mengoni, Daniele, Million, B., Modamio, V., Morales, A. I., Napoli, D. R., Naqvi, F., Nicolini, R., Nociforo, C., Pf?tzner, M., Pietri, S., Podolyak, Z. s., Prochazka, A., Prokopowicz, W., Recchia, Francesco, Regan, P. H., Reed, M. W., Rudolph, D., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., C. A., Ur, Walker, P. M., Weick, H., Wieland, O., and Wollersheim, H. J.

Published
2014

31. Half-Life Systematics across the N=126 Shell Closure:Role of First-Forbidden Transitions in the beta Decay of Heavy Neutron-Rich Nuclei

Author

Morales, AI, Benlliure, J, Kurtukian-Nieto, T, Schmidt, K-H, Verma, S, Regan, PH, Podolyak, Z, Gorska, M, Pietri, S, Kumar, R, Casarejos, E, Al-Dahan, N, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Caceres, LS, Cullen, IJ, Bacelar, AMD, Doornenbal, P, Estevez-Aguado, ME, Farrelly, G, Fujita, Y, Garnsworthy, AB, Gelletly, W, Gerl, J, Grebosz, J, Hoischen, R, Kojouharov, I, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Muecher, D, Rubio, B, Shaffner, H, Steer, SJ, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Wollersheim, HJ, and Woods, PJ

Subjects
LIVES, SPECTROSCOPY, AU-205, 1ST MEASUREMENT, Nuclear Theory, ELEMENTS, ISOTOPES, ASTROPHYSICAL R-PROCESS, Nuclear Experiment
Abstract

This Letter reports on a systematic study of beta-decay half-lives of neutron-rich nuclei around doubly magic Pb-208. The lifetimes of the 126-neutron shell isotone Pt-204 and the neighboring Ir200-202, Pt-203, Au-204 are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden beta strength reveal significant deviations for most of the nuclei with N

Published
2014

32. Isomeric Decay Spectroscopy of the 217Bi Isotope

Author

Gottardo, A., Valiente-Dobón, J. J., Benzoni, G., Lunardi, S., Gadea, A., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Bazzacco, D., Benlliure, J., Boutachkov, P., Bowry, M., Bracco, A., Bruce, A. M., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo-Pardo, C., Doncel, M., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Farnea, E., Geissel, H., Gerl, J., Goel, N., Górska, M., Grebosz, J., Gregor, E., Habermann, T., Hoischen, Robert, Janik, R., John, P. R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Modamio, V., Morales, A. I., Napoli, D. R., Naqvi, F., Nicolini, R., Nociforo, C., Pfützner, M., Pietri, S., Podolyák, Zs., Prochazka, A., Prokopowicz, W., Recchia, F., Regan, P. H., Reed, M. W., Rudolph, Dirk, Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., Weick, H., Wieland, O., and Wollersheim, H-J.

Subjects
gamma-ray spectroscopy, Subatomic Physics, isomer decay, Nuclear Experiment, RISING spectrometer, relativistic projectile fragmentation
Abstract

The structure of the neutron-rich bismuth isotope 217Bi has been studied for the first time. The fragmentation of a primary 238U beam at the FRS-RISING setup at GSI was exploited to perform γ-decay spectroscopy, since μs isomeric states were expected in this nucleus. Gamma rays following the decay of a t1/2=3 μs isomer were observed, allowing one to establish the low-lying structure of 217Bi. The level energies and the reduced electric quadrupole transition probability B(E2) from the isomeric state are compared to large-scale shell-model calculations.

Published
2014

33. beta-delayed gamma-ray spectroscopy of Au-203,Au-204 and Pt200-202

Author

Morales, AI, Benlliure, J, Gorska, M, Grawe, H, Verma, S, Regan, PH, Podolyak, Z, Pietri, S, Kumar, R, Casarejos, E, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Caceres, LS, Cullen, IJ, Bacelar, AMD, Doornenbal, P, Estevez-Aguado, ME, Farrelly, G, Fujita, Y, Garnsworthy, AB, Gelletly, W, Gerl, J, Grebosz, J, Hoischen, R, Kojouharov, I, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Muecher, D, Prokopowicz, W, Rubio, B, Schaffner, H, Steer, SJ, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Wollersheim, HJ, and Woods, PJ

Published
2013

34. Decay of the N=126, 213Fr nucleus

Author

Deo, A.Y., Podolyák, Z., Walker, P.M., Algora, A., Rubio, B., Agramunt, J., Fraile, L.M., Al-Dahan, N., Alkhomashi, N., Briz, J.A., Estevez Aguado, M.E., Farrelly, G., Gelletly, W., Herlert, A., Köster, U., and Maira, A.

Subjects
Nuclear Experiment
Abstract

γ rays following the EC/β+ and α decay of the N = 126, 213Fr nucleus have been observed at the CERN isotope separator on-line (ISOLDE) facility with the help of γ-ray and conversion-electron spectroscopy. These γ rays establish several hitherto unknown excited states in 213Rn. Also, five new α-decay branches from the 213Fr ground state have been discovered. Shell model calculations have been performed to understand the newly observed states in 213Rn.

Published
2016

35. Superallowed Gamow-Teller decay of the doubly magic nucleus Sn-100

Author

Hinke, C. B., Boehmer, M., Boutachkov, P., Faestermann, T., Geissel, H., Gerl, J., Gernhaeuser, R., Gorska, M., Gottardo, A., Grawe, H., Grebosz, J. L., Kruecken, R., Kurz, N., Liu, Z., Maier, L., Nowacki, F., Pietri, S., Podolyak, Zs, Sieja, K., Steiger, K., Straub, K., Weick, H., Wollersheim, H. -J., Woods, P. J., Al-Dahan, N., Alkhomashi, N., Atac, A., Blazhev, A., Braun, N. F., Celikovic, I. T., Davinson, T., Dillmann, I., Domingo-Pardo, C., Doornenbal, P. C., de France, G., Farrelly, G. F., Farinon, F., Goel, N., Habermann, T. C., Hoischen, R., Janik, R., Karny, M., Kaskas, A., Kojouharov, I. M., Kroell, Th, Litvinov, Y., Myalski, S., Nebel, F., Nishimura, S., Nociforo, C., Nyberg, J., Parikh, A. R., Prochazka, A., Regan, P. H., Rigollet, C., Schaffner, H., Scheidenberger, C., Schwertel, S., Soederstroem, P. -A., Steer, S. J., Stolz, A., Strmen, P., and KVI - Center for Advanced Radiation Technology

Subjects
IDENTIFICATION, Nuclear Theory, SHELL-MODEL, BETA-DECAY, Nuclear Experiment
Abstract

The shell structure of atomic nuclei is associated with 'magic numbers' and originates in the nearly independent motion of neutrons and protons in a mean potential generated by all nucleons. During beta(+)-decay, a proton transforms into a neutron in a previously not fully occupied orbital, emitting a positron-neutrino pair with either parallel or antiparallel spins, in a Gamow-Teller or Fermi transition, respectively. The transition probability, or strength, of a Gamow-Teller transition depends sensitively on the underlying shell structure and is usually distributed among many states in the neighbouring nucleus. Here we report measurements of the half-life and decay energy for the decay of Sn-100, the heaviest doubly magic nucleus with equal numbers of protons and neutrons. In the beta-decay of Sn-100, a large fraction of the strength is observable because of the large decay energy. We determine the largest Gamow-Teller strength so far measured in allowed nuclear beta-decay, establishing the 'superallowed' nature of this Gamow-Teller transition. The large strength and the low-energy states in the daughter nucleus, In-100, are well reproduced by modern, large-scale shell model calculations.

Published
2012

36. Multiple β - Decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes

Author

Al-Dahan, N, Regan, PH, Podolyák, Z, Walker, PM, Alkhomashi, N, Dracoulis, GD, Farrelly, G, Benlliure, J, Pietri, SB, Casten, RF, Stevenson, PD, Gelletly, W, Steer, SJ, Garnsworthy, AB, Casarejos, E, Gerl, J, Wollersheim, HJ, Grebosz, J, Górska, M, Kojouharov, I, Schaffner, H, Algora, A, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Cullen, IJ, Denis Bacelar, AM, Deo, AY, Estevez, ME, Fujita, Y, Hoischen, R, Kumar, R, Lalkovski, S, Liu, Z, Mason, PJ, Mihai, C, Molina, F, Mücher, D, Rubio, B, Tamii, A, Tashenov, S, Valiente-Dobón, JJ, and Woods, PJ

Subjects
Nuclear Experiment
Abstract

decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6+) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β−-decaying states in 194Re.

Published
2012

37. Multiple beta(-) decaying states in Re-194: Shape evolution in neutron-rich osmium isotopes

Author

Al-Dahan, N., Regan, P. H., Podolyak, Zs., Walker, P. M., Alkhomashi, N., Dracoulis, G. D., Farrelly, G., Benlliure, J., Pietri, S. B., Casten, R. F., Stevenson, P. D., Gelletly, W., Steer, S. J., Garnsworthy, A. B., Casarejos, E., Gerl, J., Wollersheim, H. J., Grebosz, J., Gorska, M., Kojouharov, I., Schaffner, H., Algora, A., Benzoni, G., Blazhev, A., Boutachkov, P., Bruce, A. M., Cullen, I. J., Bacelar, A. M. Denis, Deo, A. Y., Estevez, M. E., Fujita, Y., Hoischen, Robert, Kumar, R., Lalkovski, S., Liu, Z., Mason, P. J., Mihai, C., Molina, F., Muecher, D., Rubio, B., Tamii, A., Tashenov, S., Valiente-Dobon, J. J., and Woods, P. J.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Subatomic Physics, Nuclear Experiment
Abstract

beta decays from heavy, neutron-rich nuclei with A similar to 190 have been investigated following their production via the relativistic projectile fragmentation of an E/A = 1 GeV Pb-208 primary beam on a similar to 2.5 g/cm(2) Be-9 target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. gamma decays were observed and correlated with these secondary ions on an event-by-event basis such that gamma-ray transitions following from both internal (isomeric) and beta decays were recorded. A number of discrete, beta-delayed gamma-ray transitions associated with beta decays from Re-194 to excited states in Os-194 have been observed, including previously reported decays from the yrast I-pi = (6(+)) state. Three previously unreported gamma-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in Os-194. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in Os-194, it is concluded that there are three beta(-)-decaying states in Re-194.

Published
2012

38. Synthesis of N=127 isotones through (p,n) charge-exchange reactions induced by relativistic Pb-208 projectiles

Author

Morales, AI, Benlliure, J, Agramunt, J, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Boutachkov, P, Bruce, AM, Caceres, LS, Casarejos, E, Bacelar, AMD, Doornenbal, P, Dragosavac, D, Farrelly, G, Gadea, A, Gelletly, W, Gerl, J, Gorska, M, Grebosz, J, Kojouharov, I, Molina, F, Perez-Loureiro, D, Pietri, S, Podolyak, Z, Regan, PH, Rubio, B, Shaffner, H, Steer, SJ, Tashenov, S, Verma, S, and Wollersheim, HJ

Published
2011

39. Enhancedγ-Ray Emission from Neutron Unbound States Populated inβDecay

Author

Tain, J. L., primary, Valencia, E., additional, Algora, A., additional, Agramunt, J., additional, Rubio, B., additional, Rice, S., additional, Gelletly, W., additional, Regan, P., additional, Zakari-Issoufou, A.-A., additional, Fallot, M., additional, Porta, A., additional, Rissanen, J., additional, Eronen, T., additional, Äystö, J., additional, Batist, L., additional, Bowry, M., additional, Bui, V. M., additional, Caballero-Folch, R., additional, Cano-Ott, D., additional, Elomaa, V.-V., additional, Estevez, E., additional, Farrelly, G. F., additional, Garcia, A. R., additional, Gomez-Hornillos, B., additional, Gorlychev, V., additional, Hakala, J., additional, Jordan, M. D., additional, Jokinen, A., additional, Kolhinen, V. S., additional, Kondev, F. G., additional, Martínez, T., additional, Mendoza, E., additional, Moore, I., additional, Penttilä, H., additional, Podolyák, Zs., additional, Reponen, M., additional, Sonnenschein, V., additional, and Sonzogni, A. A., additional

Published
2015
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42. Structures of Po201 and Rn205 from EC/β+-decay studies

Author

Deo, A. Y., Podolyák, Zs., Walker, P. M., Algora, Alejandro, Rubio, Berta, Agramunt, Jorge, Fraile, Luis M., Al-Dahan, N., Alkhomashi, N., Briz, José Antonio, Estévez Aguado, María Esther, Farrelly, G., Gelletly, W., Herlert, A., Köster, Ulli, Maira-Vidal, A., and Singla, S.

Abstract

Several low-lying excited states in 86205Rn119 and 84201Po117 were identified for the first time following EC/β+ decay of Fr205 and At201, respectively, using γ-ray and conversion electron spectroscopy at the CERN isotope separator on-line (ISOLDE) facility. The EC/β+ branch from Fr205 was measured to be 1.5(2)%. The excited states of the daughter nuclei are understood in terms of the odd nucleon coupling to the neighboring even-even core. The neutron single-particle energies of the p3/2 orbital relative to the f5/2 ground state in Rn205, and the f5/2 orbital relative to the p3/2 ground state in Po201, were determined to be 31.4(2) and 5.7(3) keV, respectively. We tentatively identify a 132+ isomeric level at 657.1(5) keV in Rn205. The systematic behavior of the 132+ and 32- levels is also discussed. © 2010 The American Physical Society., Financial support from the UK STFC and AWE plc, the Spanish MEC FPA2007-07393, CSPD-2007-00042 CPAN, FPA2005-03993, and FPA 2008-06419-C02-01 projects. Partial support from the Ramon y Cajal program.

Published
2010

43. Half-Life Systematics across the N=126 Shell Closure: Role of First-Forbidden Transitions in the β Decay of Heavy Neutron-Rich Nuclei.

Author

Morales, A I, Benlliure, J, Kurtukián-Nieto, T, Schmidt, K-H, Verma, S, Regan, P H, Podolyák, Z, Górska, M, Pietri, S, Kumar, R, Casarejos, E, Al-Dahan, N, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, A M, Cáceres, L S, Cullen, I J, Denis Bacelar, A M, Doornenbal, P, Estévez-Aguado, M E, Farrelly, G, Fujita, Y, Garnsworthy, A B, Gelletly, W, Gerl, J, Grebosz, J, Hoischen, Robert, Kojouharov, I, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Mücher, D, Rubio, B, Shaffner, H, Steer, S J, Tamii, A, Tashenov, S, Valiente-Dobón, J J, Walker, P M, Wollersheim, H J, Woods, P J, Morales, A I, Benlliure, J, Kurtukián-Nieto, T, Schmidt, K-H, Verma, S, Regan, P H, Podolyák, Z, Górska, M, Pietri, S, Kumar, R, Casarejos, E, Al-Dahan, N, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, A M, Cáceres, L S, Cullen, I J, Denis Bacelar, A M, Doornenbal, P, Estévez-Aguado, M E, Farrelly, G, Fujita, Y, Garnsworthy, A B, Gelletly, W, Gerl, J, Grebosz, J, Hoischen, Robert, Kojouharov, I, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Mücher, D, Rubio, B, Shaffner, H, Steer, S J, Tamii, A, Tashenov, S, Valiente-Dobón, J J, Walker, P M, Wollersheim, H J, and Woods, P J

Abstract

This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic ^{208}Pb. The lifetimes of the 126-neutron shell isotone ^{204}Pt and the neighboring ^{200-202}Ir, ^{203}Pt, ^{204}Au are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N<126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during β decay back to stability.

Published
2014

44. Half-Life Systematics across the N=126 Shell Closure: Role of First-Forbidden Transitions in the beta Decay of Heavy Neutron-Rich Nuclei

Author

Morales, AI, Benlliure, J, Kurtukian-Nieto, T, Schmidt, K-H, Verma, S, Regan, PH, Podolyak, Z, Gorska, M, Pietri, S, Kumar, R, Casarejos, E, Al-Dahan, N, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Caceres, LS, Cullen, IJ, Bacelar, AMD, Doornenbal, P, Estevez-Aguado, ME, Farrelly, G, Fujita, Y, Garnsworthy, AB, Gelletly, W, Gerl, J, Grebosz, J, Hoischen, R, Kojouharov, I, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Muecher, D, Rubio, B, Shaffner, H, Steer, SJ, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Wollersheim, HJ, Woods, PJ, Morales, AI, Benlliure, J, Kurtukian-Nieto, T, Schmidt, K-H, Verma, S, Regan, PH, Podolyak, Z, Gorska, M, Pietri, S, Kumar, R, Casarejos, E, Al-Dahan, N, Algora, A, Alkhomashi, N, Alvarez-Pol, H, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Caceres, LS, Cullen, IJ, Bacelar, AMD, Doornenbal, P, Estevez-Aguado, ME, Farrelly, G, Fujita, Y, Garnsworthy, AB, Gelletly, W, Gerl, J, Grebosz, J, Hoischen, R, Kojouharov, I, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Muecher, D, Rubio, B, Shaffner, H, Steer, SJ, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Wollersheim, HJ, and Woods, PJ

Published
2014

45. beta-decay studies of neutron-rich Tl, Pb, and Bi isotopes

Author

Morales, A. I., Benzoni, G., Gottardo, A., Valiente-Dobon, J. J., Blasi, N., Bracco, A., Camera, F., Crespi, F. C. L., Corsi, A., Leoni, S., Million, B., Nicolini, R., Wieland, O., Gadea, A., Lunardi, S., Gorska, M., Regan, P. H., Podolyak, Zs., Pfuetzner, M., Pietri, S., Boutachkov, P., Weick, H., Grebosz, J., Bruce, A. M., Alcantara Nunez, J., Algora, A., Al-Dahan, N., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bunce, M., Casarejos, E., Cortes, M. L., Bacelar, A. M. Denis, Deo, A. Y., de Angelis, G., Domingo-Pardo, C., Doncel, M., Dombradi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Farnea, E., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I., Kurz, N., Mandal, S., Menegazzo, R., Mengoni, D., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R. V., Reed, M. W., Rudolph, D., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., Wollersheim, H. -J., Morales, A. I., Benzoni, G., Gottardo, A., Valiente-Dobon, J. J., Blasi, N., Bracco, A., Camera, F., Crespi, F. C. L., Corsi, A., Leoni, S., Million, B., Nicolini, R., Wieland, O., Gadea, A., Lunardi, S., Gorska, M., Regan, P. H., Podolyak, Zs., Pfuetzner, M., Pietri, S., Boutachkov, P., Weick, H., Grebosz, J., Bruce, A. M., Alcantara Nunez, J., Algora, A., Al-Dahan, N., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bunce, M., Casarejos, E., Cortes, M. L., Bacelar, A. M. Denis, Deo, A. Y., de Angelis, G., Domingo-Pardo, C., Doncel, M., Dombradi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Farnea, E., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., Klupp, S., Kojouharov, I., Kurz, N., Mandal, S., Menegazzo, R., Mengoni, D., Napoli, D. R., Naqvi, F., Nociforo, C., Prochazka, A., Prokopowicz, W., Recchia, F., Ribas, R. V., Reed, M. W., Rudolph, D., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., and Wollersheim, H. -J.

Abstract

The fragmentation of relativistic uranium projectiles has been exploited at the Gesellschaft fur Schwerionenforschung laboratory to investigate the beta decay of neutron-rich nuclei just beyond Pb-208. This paper reports on beta-delayed gamma decays of Tl211-213, Pb-215, and Bi215-219 de-exciting states in the daughters Pb211-213, Bi-215, and Po215-219. The resulting partial level schemes, proposed with the help of systematics and shell-model calculations, are presented. The role of allowed Gamow-Teller and first-forbidden beta transitions in this mass region is discussed.

Published
2014

46. Half-Life Systematics across the N=126 Shell Closure: Role of First-Forbidden Transitions in the beta Decay of Heavy Neutron-Rich Nuclei

Author

Morales, A. I., Benlliure, J., Kurtukian-Nieto, T., Schmidt, K. -H, Verma, S., Regan, P. H., Podolyak, Z., Gorska, M., Pietri, S., Kumar, R., Casarejos, E., Al-Dahan, N., Algora, A., Alkhomashi, N., Alvarez-Pol, H., Benzoni, G., Blazhev, A., Boutachkov, P., Bruce, A. M., Caceres, L. S., Cullen, I. J., Bacelar, A. M. Denis, Doornenbal, P., Estevez-Aguado, M. E., Farrelly, G., Fujita, Y., Garnsworthy, A. B., Gelletly, W., Gerl, J., Grebosz, J., Hoischen, R., Kojouharov, I., Kurz, N., Lalkovski, S., Liu, Z., Mihai, C., Molina, F., Muecher, D., Rubio, B., Shaffner, H., Steer, S. J., Tamii, A., Tashenov, S., Valiente-Dobon, J. J., Walker, P. M., Wollersheim, H. J., Woods, P. J., Morales, A. I., Benlliure, J., Kurtukian-Nieto, T., Schmidt, K. -H, Verma, S., Regan, P. H., Podolyak, Z., Gorska, M., Pietri, S., Kumar, R., Casarejos, E., Al-Dahan, N., Algora, A., Alkhomashi, N., Alvarez-Pol, H., Benzoni, G., Blazhev, A., Boutachkov, P., Bruce, A. M., Caceres, L. S., Cullen, I. J., Bacelar, A. M. Denis, Doornenbal, P., Estevez-Aguado, M. E., Farrelly, G., Fujita, Y., Garnsworthy, A. B., Gelletly, W., Gerl, J., Grebosz, J., Hoischen, R., Kojouharov, I., Kurz, N., Lalkovski, S., Liu, Z., Mihai, C., Molina, F., Muecher, D., Rubio, B., Shaffner, H., Steer, S. J., Tamii, A., Tashenov, S., Valiente-Dobon, J. J., Walker, P. M., Wollersheim, H. J., and Woods, P. J.

Abstract

This Letter reports on a systematic study of beta-decay half-lives of neutron-rich nuclei around doubly magic Pb-208. The lifetimes of the 126-neutron shell isotone Pt-204 and the neighboring Ir200-202, Pt-203, Au-204 are presented together with other 19 half-lives measured during the stopped beam campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden beta strength reveal significant deviations for most of the nuclei with N < 126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during beta decay back to stability.

Published
2014

47. Isomeric decay spectroscopy of the Bi-217 isotope

Author

Gottardo, A., Valiente-Dobon, J. J., Benzoni, G., Lunardi, S., Gadea, A., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Bazzacco, D., Benlliure, J., Boutachkov, P., Bowry, M., Bracco, A., Bruce, A. M., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Bacelar, A. M. Denis, Deo, A. Y., Domingo-Pardo, C., Doncel, M., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Farnea, E., Geissel, H., Gerl, J., Goel, N., Gorska, M., Grebosz, J., Gregor, E., Habermann, T., Hoischen, R., Janik, R., John, P. R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Modamio, V., Morales, A. I., Napoli, D. R., Naqvi, F., Nicolini, R., Nociforo, C., Pfuetzner, M., Pietri, S., Podolyak, Zs., Prochazka, A., Prokopowicz, W., Recchia, F., Regan, P. H., Reed, M. W., Rudolph, D., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., Weick, H., Wieland, O., Wollersheim, H-J., Gottardo, A., Valiente-Dobon, J. J., Benzoni, G., Lunardi, S., Gadea, A., Algora, A., Al-Dahan, N., de Angelis, G., Ayyad, Y., Bazzacco, D., Benlliure, J., Boutachkov, P., Bowry, M., Bracco, A., Bruce, A. M., Bunce, M., Camera, F., Casarejos, E., Cortes, M. L., Crespi, F. C. L., Corsi, A., Bacelar, A. M. Denis, Deo, A. Y., Domingo-Pardo, C., Doncel, M., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Farnea, E., Geissel, H., Gerl, J., Goel, N., Gorska, M., Grebosz, J., Gregor, E., Habermann, T., Hoischen, R., Janik, R., John, P. R., Klupp, S., Kojouharov, I., Kurz, N., Lenzi, S. M., Leoni, S., Mandal, S., Menegazzo, R., Mengoni, D., Million, B., Modamio, V., Morales, A. I., Napoli, D. R., Naqvi, F., Nicolini, R., Nociforo, C., Pfuetzner, M., Pietri, S., Podolyak, Zs., Prochazka, A., Prokopowicz, W., Recchia, F., Regan, P. H., Reed, M. W., Rudolph, D., Sahin, E., Schaffner, H., Sharma, A., Sitar, B., Siwal, D., Steiger, K., Strmen, P., Swan, T. P. D., Szarka, I., Ur, C. A., Walker, P. M., Weick, H., Wieland, O., and Wollersheim, H-J.

Abstract

The structure of the neutron-rich bismuth isotope Bi-217 has been studied for the first time. The fragmentation of a primary U-238 beam at the FRS-RISING setup at GSI was exploited to perform gamma-decay spectroscopy, since mu s isomeric states were expected in this nucleus. Gamma rays following the decay of a t(1/2) = 3 mu s isomer were observed, allowing one to establish the low-lying structure of Bi-217. The level energies and the reduced electric quadrupole transition probability B(E2) from the isomeric state are compared to large-scale shell-model calculations.

Published
2014

48. beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

Author

Alkhomashi, N, Regan, PH, Podolyak, Z, Pietri, S, Garnsworthy, AB, Steer, SJ, Benlliure, J, Caserejos, E, Casten, RF, Gerl, J, Wollersheim, HJ, Grebosz, J, Farrelly, G, Gorska, M, Kojouharov, I, Schaffner, H, Algora, A, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Bacelar, AMD, Cullen, IJ, Caceres, L, Doornenbal, P, Estevez, ME, Fujita, Y, Gelletly, W, Hoischen, R, Kumar, R, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Morales, AI, Muecher, D, Prokopowicz, W, Rubio, B, Shi, Y, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Woods, PJ, and Xu, FR

Published
2009

49. Revision of the K-Isomer in 190W

Author

Farrelly, G. F., Zs. Podolyak, Steer, S. J., Pietri, S., Xu, F. R., Werner-Malento, E., Shizuma, T., Regan, P. H., Dirk Rudolph, Garnsworthy, A. B., Robert Hoischen, Gorska, M., Gerl, J., Wollersheim, H. J., Kurtukian-Nieto, T., Benzoni, G., Becker, F., Bednarczyk, P., Caceres, L., Doornenbal, P., Geisserl, H., Grebosz, J., Kelic, A., Kojouharov, I., Kurz, N., Montes, F., Prokopowicz, W., Saito, T., Schaffner, H., Tashenov, S., Heinz, A., Pfuezner, M., Jungclaus, A., Balabanski, D. L., Brandau, C., Bruce, A. M., Catford, W. N., Cullen, I. J., Zs. Dombradi, Estevez, E., Gelletly, W., Ilie, G., Jolie, J., Jones, G. A., Kmiecik, M., Kondev, F. G., Kruecken, R., Lalkovski, S., Liu, H. L., Liu, Z., Maj, A., Myalski, S., Schwerrel, S., Walker, P. M., and Wieland, O.

Subjects
Subatomic Physics, Nuclear Experiment
Abstract

Gamma rays from the decay of an isomer in W-190(116) have been observed following projectile fragmentation of a 1 GeV per nucleon Pb-208 beam. An earlier experiment indicated decay from a (10(-)) isomer to the ground state rotational band. Improved statistics have enabled gamma coincidence and time-difference measurements to be made which alter the previous interpretation. Blocked BCS calculations have also been used together with reduced hindrance factors to indicate possible values of spin-parity for the isomer.

Published
2009

50. Isomeric States In 208Hg And 209Tl Populated In Fragmentation Of 238U

Author

Al-Dahan, N., Algora, A., Alkhomashi, N., Bacelar, A. M. D., Benlliure, J., Boutachkov, P., Bracco, A., Bruce, A. M., Enrico Calore, Casarejos, E., Cullen, I. J., Deo, A. Y., Detistov, P., Dombrádi, Z., Domingo-Pardo, C., Doncel, M., Farinon, F., Farrelly, G., Geissel, H., Gelletly, W., Gerl, J., Goel, N., Grawe, H., Grebosz, J., Górska, M., Hoischen, R., Kojouharov, I., Kurz, N., Lalkovski, S., Leoni, S., Molina, F., Montanari, D., Morales, A. I., Musumarra, A., Napoli, D. R., Nicolini, R., Nociforo, C., Pietri, S. B., Podolyák, Z., Prochazka, A., Prokopowicz, W., Regan, P. H., Rubio, B., Rudolph, D., Schaffner, H., Steer, S. J., Strmen, P., Swan, T., Szarka, I., Valiente-Dobon, J. J., Verma, S., Walker, P. M., Weick, H., and Wollersheim, H. J.

Subjects
Subatomic Physics
Abstract

The nuclear structure of neutron-rich N > 126 nuclei has been investigated following their production via relativistic projectile fragmentation of a E/A = 1 GeV U-238 beam on a Be target. The preliminary analysis indicates the presence of previously unreported isomeric states in the N = 128 isotones Hg-208 and Tl-209.

Published
2009

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