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239 results on '"Sulignano, B."'

1. First observation of high-$K$ isomeric states in $^{249}$Md and $^{251}$Md

Author

Goigoux, T., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Badran, H., Briselet, R., Calverley, T., Cox, D., Déchery, F., Bisso, F. Defranchi, Drouart, A., Favier, Z., Gall, B., Grahn, T., Greenlees, P. T., Hauschild, K., Herzáň, A., Herzberg, R. -D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Lopez-Martens, A., Mistry, A., Nieminen, P., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rey-Herme, E., Rubert, J., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Vandebrouck, M., Ward, A., Zielińska, M., Jachimowicz, P., Kowal, M., and Skalski, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Decay spectroscopy of the odd-proton nuclei $^{249}$Md and $^{251}$Md has been performed. High-$K$ isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of $2.8(5)$ ms and an excitation energy $\geq 910$ keV was found in $^{249}$Md. In $^{251}$Md, an isomeric state with a half-life of $1.4(3)$ s and an excitation energy $\geq 844$ keV was found. Similarly to the neighbouring $^{255}$Lr, these two isomeric states are interpreted as 3 quasi-particle high-$K$ states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen-Cooper-Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods-Saxon potential. The most probable candidates for the configurations of $K$-isomeric states in Md nuclei are proposed.

Published
2021
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2. In-beam gamma-ray and electron spectroscopy of $^{249,251}$Md

Author

Briselet, R., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Cox, D. M., Déchery, F., Drouart, A., Favier, Z., Gall, B., Goigoux, T., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Herzberg, R. -D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lopez-Martens, A., Mistry, A., Nieminen, P., Pakarinen, J., Papadakis, P., Peura, P., Rahkila, P., Rey-Herme, E., Rubert, J., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Vandebrouck, M., Ward, A., Zielińska, M., Bally, B., Bender, M., and Ryssens, W.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The odd-$Z$ $^{251}$Md nucleus was studied using combined $\gamma$-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the $[521]1/2^-$ configuration, another rotational structure has been identified using $\gamma$-$\gamma$ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a $[514]7/2^-$ single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of $\simeq$ 60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely $g_K = 0.69^{+0.19}_{-0.16}$ for the ground-state band. The odd-$Z$ $^{249}$Md was studied using $\gamma$-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the $\Delta l = \Delta j = 3$ $[521]3/2^-$ and $[633]7/2^+$ Nilsson orbitals were found in both $^{249,251}$Md. A surprising similarity of the $^{251}$Md ground-state band transition energies with those of the excited band of $^{255}$Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands.

Published
2020
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3. VADER: A novel decay station for actinide spectroscopy

Author

Raggio, A., Pohjalainen, I., Rey-Herme, E., Beliuskina, O., Bequet, J., Block, M., Eronen, T., Illana, A., Jaries, A., Kankainen, A., Kumar, D., Moore, I.D., Mougeot, M., Plaza, A.M., Reponen, M., Sarén, J., Sulignano, B., Stryjczyk, M., Thisse, D., Vandebrouck, M., and Warbinek, J.

Published
2023
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4. Evidence for coexisting shapes in $^{98}$Zr through lifetime measurements

Author

Singh, Purnima, Korten, W., Hagen, T. W., Görgen, A., Grente, L., Salsac, M. -D., Farget, F., Clément, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I., Delaune, O., Dewald, A., Dijon, A., Delaroche, J. -P., Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Müller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch., and Valiente-Dobon, J. J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The lifetimes of first excited 2$^+$, 4$^+$ and 6$^+$ states in $^{98}$Zr were measured with the Recoil-Distance Doppler Shift method in an experiment performed at GANIL. Excited states in $^{98}$Zr were populated using the fission reaction between a 6.2 MeV/u $^{238}$U beam and a $^{9}$Be target. The $\gamma$ rays were detected with the EXOGAM array in correlation with the fission fragments identified in mass and atomic number in the VAMOS++ spectrometer. Our result shows very small B(E2;2$_1^+$ $\rightarrow$ 0$_1^+$) value in $^{98}$Zr thereby confirming the very sudden onset of collectivity at $N=60$. The experimental results are compared to large-scale Monte Carlo Shell model and beyond mean field calculations. The present results indicate coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2019
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5. Production cross section and decay study of $^{243}$Es and $^{249}$Md

Author

Briselet, R., Theisen, Ch., Vandebrouck, M., Marchix, A., Airiau, M., Auranen, K., Badran, H., Boilley, D., Calverley, T., Cox, D., Déchery, F., Bisso, F. Defranchi, Drouart, A., Gall, B., Goigoux, T., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Herzberg, R. D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Lopez-Martens, A., Mistry, A., Nieminen, P., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rubert, J., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Sulignano, B., Uusitalo, J., Ward, A., and Zielińska, M.

Subjects
Nuclear Experiment
Abstract

In the study of the odd-$Z$, even-$N$ nuclei $^{243}$Es and $^{249}$Md, performed at the University of Jyv\"askyl\"a, the fusion-evaporation reactions $^{197}$Au($^{48}$Ca,2$n$)$^{243}$Es and $^{203}$Tl($^{48}$Ca,2$n$)$^{249}$Md have been used for the first time. Fusion-evaporation residues were selected and detected using the RITU gas-filled separator coupled with the focal-plane spectrometer GREAT. For $^{243}$Es, the recoil decay correlation analysis yielded a half-life of $24 \pm 3$s, and a maximum production cross section of $37 \pm 10$ nb. In the same way, a half-life of $26 \pm 1$ s, an $\alpha$ branching ratio of 75 $\pm$ 5%, and a maximum production cross section of 300 $\pm$ 80 nb were determined for $^{249}$Md. The decay properties of $^{245}$Es, the daughter of $^{249}$Md, were also measured: an $\alpha$ branching ratio of 54 $\pm$ 7% and a half-life of 65 $\pm$ 6 s. Experimental cross sections were compared to the results of calculations performed using the KEWPIE2 statistical fusion-evaporation code.

Published
2018
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6. Study of $^{124}$Sn+$^{136}$Xe fusion-evaporation: analysis of a rare-event experiment

Author

Avez, Benoît, Drouart, Antoine, Stodel, Ch., Simenel, Cédric, Alcantara, J., Adamczyk, M., Banka, P., Bonnet, E., Clément, E., Dayras, R., Force, C., Golabek, C., Gonciarz, A., Grevy, S., Hauschild, K., Jacquet, D., Korichi, A., Kozik, T., Lazko, P., Morjean, M., Popeko, A., Roger, T., Saint-Laurent, M. -G., Sosin, Z., Sulignano, B., Theisen, C., Wieloch, A., Yeremin, A., Yilmaz, B., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

Fusion-evaporation in the $^{124}$Sn+$^{136}$Xe system is studied using a high intensity xenon beam provided by the Ganil accelerator and the LISE3 wien filter for the selection of the products. Due to the mass symmetry of the entrance system, the rejection of the beam by the spectrometer was of the order of $5times10^8$. We have thus performed a detailed statistical analysis to estimate random events and to infer the fusion-evaporation cross sections. No signicant decay events were detected and upper limit cross sections of 172 pb, 87 pb and 235 pb were deduced for the synthesis of $^{257}$Rf, $^{258}$Rf and $^{259}$Rf, respectively., Comment: 7 pages, 4 figures

Published
2011

7. The Super Separator Spectrometer [formula omitted] and the associated detection systems: SIRIUS & LEB-REGLIS3

Author

Déchery, F., Savajols, H., Authier, M., Drouart, A., Nolen, J., Ackermann, D., Amthor, A.M., Bastin, B., Berryhill, A., Boutin, D., Caceres, L., Coffey, M., Delferrière, O., Dorvaux, O., Gall, B., Hauschild, K., Hue, A., Jacquot, B., Karkour, N., Laune, B., Le Blanc, F., Lecesne, N., Lopez-Martens, A., Lutton, F., Manikonda, S., Meinke, R., Olivier, G., Payet, J., Piot, J., Pochon, O., Prince, V., Souli, M., Stelzer, G., Stodel, C., Stodel, M.-H., Sulignano, B., Traykov, E., and Uriot, D.

Published
2016
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8. Multinucleon Transfer Reactions in the \(^{238}\mathrm {U}+{^{238}}\)U System Studied with the VAMOS\(+\)AGATA\(+\)ID-Fix

Author

Utepov, A., primary, Ackermann, D., additional, Stodel, C., additional, Lemasson, A., additional, Ramos, D., additional, Rejmund, M., additional, Clement, E., additional, Jacquot, B., additional, Piot, J., additional, Ducret, J.E., additional, Caceres, L., additional, Savajols, H., additional, Chakma, R., additional, Heinz, S., additional, Kindler, B., additional, Lommel, B., additional, Korichi, A., additional, Lopez-Martens, A., additional, Hauschild, K., additional, Sulignano, B., additional, Theisen, C., additional, Vandebrouck, M., additional, Rey-Herme, E., additional, Gadea, A., additional, Corradi, L., additional, Fioretto, E., additional, Galtarossa, F., additional, Szilner, S., additional, Mijatović, T., additional, Fougères, C., additional, Seweryniak, D., additional, Kim, Y.H., additional, Cho, Y., additional, Son, Y., additional, Matejska-Minda, M., additional, Dorvaux, O., additional, Forge, M., additional, Kessaci, K., additional, Gall, B., additional, Marini, P., additional, and Million, B., additional

Published
2023
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9. Level structure of <math><mmultiscripts><mi>Ac</mi><mprescripts/><none/><mn>221</mn></mmultiscripts></math> and <math><mmultiscripts><mi>Fr</mi><mprescripts/><none/><mn>217</mn></mmultiscripts></math> from decay spectroscopy, and reflection asymmetry in <math><mmultiscripts><mi>Ac</mi><mprescripts/><none/><mn>221</mn></mmultiscripts></math>

Author

Rey-Herme, E, Raggio, A, Vandebrouck, M, Moore, I, Pohjalainen, I, Delafosse, C, de Groote, R, Ge, Z, Geldhof, S, Hukkanen, M, Kankainen, A, Koszorus, A, Nesterenko, D, Sarén, J, Sulignano, B, Theisen, Ch, Thisse, D, Weaver, A.P, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and IGISOL

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

International audience; Pa225 and Ac221 were produced at the IGISOL facility through proton-induced fusion-evaporation reactions and have been studied using α-particle spectroscopy, as well as α-γ and α-electron coincidence spectroscopy. The level scheme of Ac221, daughter of Pa225, and of Fr217, daughter of Ac221 were reconstructed. An interpretation of Ac221 levels as K=5/2± and K=3/2± parity-doublet bands is proposed. Such bands appear in reflection-asymmetric models and would be an indication of a static reflection asymmetric shape for Ac221.

Published
2023

10. Musett: A segmented Si array for Recoil-Decay-Tagging studies at VAMOS

Author

Theisen, Ch., Jeanneau, F., Sulignano, B., Druillole, F., Ljungvall, J., Paul, B., Virique, E., Baron, P., Bervas, H., Clément, E., Delagnes, E., Dijon, A., Dossat, E., Drouart, A., Farget, F., Flouzat, Ch., De France, G., Görgen, A., Houarner, Ch., Jacquot, B., Korten, W., Lebertre, G., Lecornu, B., Legeard, L., Lermitage, A., Lhenoret, S., Marry, C., Maugeais, C., Menager, L., Meunier, O., Navin, A., Nizery, F., Obertelli, A., Rauly, E., Raine, B., Rejmund, M., Ropert, J., Saillant, F., Savajols, H., Schmitt, Ch., Tripon, M., Wanlin, E., and Wittwer, G.

Published
2014
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11. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

Author

Hagen, T. W., Görgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clément, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Published
2018
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12. Decay studies of new isomeric states in No255

Author

Bronis, A., primary, Heßberger, F. P., additional, Antalic, S., additional, Andel, B., additional, Ackermann, D., additional, Heinz, S., additional, Hofmann, S., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Kojouharov, I., additional, Kuusiniemi, P., additional, Leino, M., additional, Lommel, B., additional, Mann, R., additional, Nishio, K., additional, Popeko, A. G., additional, Streicher, B., additional, Sulignano, B., additional, Uusitalo, J., additional, Venhart, M., additional, and Yeremin, A. V., additional

Published
2022
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13. Decay studies of new isomeric states in 255No

Author

Bronis, A., Heßberger, F. P., Antalic, S., Andel, B., Ackermann, D., Heinz, S., Hofmann, S., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Nishio, K., Popeko, A. G., Streicher, B., Sulignano, B., Uusitalo, J., Venhart, M., and Yeremin, A. V.

Subjects
ydinfysiikka
Abstract

The decay of excited states in 255No was investigated by applying the evaporation-residue–conversion-electron correlation technique. Two new isomeric states were observed in 255No together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and γ rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in 255No is proposed, and their Nilsson configurations are discussed. The energy decrease of the 11/2−[725] Nilsson level for heavy N=153 isotones as a function of increasing proton number is confirmed. peerReviewed

Published
2022

14. First observation of high-K isomeric states in Md-249 and Md-251

Author

Goigoux, T, Theisen, Ch, Sulignano, B, Airiau, M, Auranen, K, Badran, H, Briselet, R, Calverley, T, Cox, D, Dechery, F, Bisso, F Defranchi, Drouart, A, Favier, Z, Gall, B, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Herzberg, R-D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, Lightfoot, A, Lopez-Martens, A, Mistry, A, Nieminen, P, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Rey-Herme, E, Rubert, J, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Sorri, J, Stolze, S, Uusitalo, J, Vandebrouck, M, Ward, A, Zielinska, M, Jachimowicz, P, Kowal, M, and Skalski, J

Published
2021

15. First observation of high-K isomeric states in $$^{249}$$Md and $$^{251}$$Md

Author

Goigoux, T., primary, Theisen, Ch., additional, Sulignano, B., additional, Airiau, M., additional, Auranen, K., additional, Badran, H., additional, Briselet, R., additional, Calverley, T., additional, Cox, D., additional, Déchery, F., additional, Bisso, F. Defranchi, additional, Drouart, A., additional, Favier, Z., additional, Gall, B., additional, Grahn, T., additional, Greenlees, P. T., additional, Hauschild, K., additional, Herzáň, A., additional, Herzberg, R.-D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, Lightfoot, A., additional, Lopez-Martens, A., additional, Mistry, A., additional, Nieminen, P., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Rey-Herme, E., additional, Rubert, J., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Uusitalo, J., additional, Vandebrouck, M., additional, Ward, A., additional, Zielińska, M., additional, Jachimowicz, P., additional, Kowal, M., additional, and Skalski, J., additional

Published
2021
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17. NEWGAIN White Book - Science Requirements - Work Package Physics

Author

Ackermann, D., Blank, B., Caceres, L., Caamaño, M., France, G., Gall, B., Grévy, S., Grygiel, C., Lamour, E., Ledoux, X., Manea, V., Ch. Peaucelle, Rangama, J., Redon, N., Gheorghe Iulian Stefan, Ch. Stodel, Sulignano, B., Ch. Theisen, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidade de Santiago de Compostela [Spain] (USC ), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Matériaux, Défauts et IRradiations (MADIR), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Atomes, Molécules et Agrégats (AMA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, GANIL - document link: https://www.ganil-spiral2.eu/scientists/ganil-spiral-2-facilities/accelerators/newgain, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

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

The new injector for SPIRAL2 at GANIL, NEWGAIN is presently in its design phase. The major constraints for its technical concepts are determined by the requirements of its future users, the national French and the international scientific communities. The facility will offer heavy ion beams of unmatched intensity for fundamental and applied research. This document reports on the specific requirements of the scientific communities in terms of beam energy, intensity, time structure and other features which are needed to conduct the envisaged research programs at the experimental installations, which are or will be coupled to the linear accelerator of the SPIRAL2 facility at GANIL. It aims at fostering the information exchange between the scientific community and the technical and engineering team who is designing, planning and constructing NEWGAIN. The document has been elaborated by the members of the Work Package Physics (WPP) of the NEWGAIN project, consisting of the scientific coordinators of the institutions contributing to and participating in NEWGAIN, and representatives of the various scientific collaborations engaged in the exploitation of the SPIRAL2 accelerator facility. The document is organized with active links to sections, subsections, figures, tables and literature references integrated in the text.

Published
2021

19. Isomeric states in 253No and 253Fm

Author

Antalic, S., Heßberger, F. P., Ackermann, D., Heinz, S., Hofmann, S., Kalaninová, Z., Kindler, B., Khuyagbaatar, J., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Nishio, K., Šáro, Š., Streicher, B., Sulignano, B., and Venhart, M.

Published
2011
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20. Decay study of 246Fm at SHIP

Author

Venhart, M., Heßberger, F. P., Ackermann, D., Antalic, S., Gray-Jones, C., Greenlees, P. T., Heinz, S., Herzberg, R. -D., Hofmann, S., Ketelhut, S., Kindler, B., Kojouharov, I., Leino, M., Lommel, B., Mann, R., Papadakis, P., Rostron, D., Rudolph, D., Šáro, Š., and Sulignano, B.

Published
2011
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21. Alpha-gamma decay studies of 261Sg and 257Rf

Author

Streicher, B., Heßberger, F. P., Antalic, S., Hofmann, S., Ackermann, D., Heinz, S., Kindler, B., Khuyagbaatar, J., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Šáro, Š., Sulignano, B., Uusitalo, J., and Venhart, M.

Published
2010
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22. Decay studies of K isomers in 254No

Author

Heßberger, F. P., Antalic, S., Sulignano, B., Ackermann, D., Heinz, S., Hofmann, S., Kindler, B., Khuyagbaatar, J., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Nishio, K., Popeko, A. G., Šáro, Š., Streicher, B., Uusitalo, J., Venhart, M., and Yeremin, A. V.

Published
2010
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26. Isomeric states in 214Th and 213Th

Author

Khuyagbaatar, J., Hofmann, S., Heßberger, F. P., Ackermann, D., Antalic, S., Burkhard, H. G., Heinz, S., Kindler, B., Lisetskiy, A. F., Lommel, B., Mann, R., Nishio, K., Schött, H. J., and Sulignano, B.

Published
2007
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27. Identification of a K isomer in 252No

Author

Sulignano, B., Heinz, S., Heßberger, F. P., Hofmann, S., Ackermann, D., Antalic, S., Kindler, B., Kojouharov, I., Kuusiniemi, P., Lommel, B., Mann, R., Nishio, K., Popeko, A. G., Saro, S., Streicher, B., Venhart, M., and Yeremin, A. V.

Published
2007
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28. The reaction 48Ca + 238U → 286112* studied at the GSI-SHIP

Author

Hofmann, S., Ackermann, D., Antalic, S., Burkhard, H. G., Comas, V. F., Dressler, R., Gan, Z., Heinz, S., Heredia, J. A., Heßberger, F. P., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Münzenberg, G., Nishio, K., Popeko, A. G., Saro, S., Schött, H. J., Streicher, B., Sulignano, B., Uusitalo, J., Venhart, M., and Yeremin, A. V.

Published
2007
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29. In-beam gamma-ray and electron spectroscopy of Md-249,Md-251

Author

Briselet, R, Theisen, Ch, Sulignano, B, Airiau, M, Auranen, K, Cox, DM, Dechery, F, Drouart, A, Favier, Z, Gall, B, Goigoux, T, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Herzberg, R-D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, Lopez-Martens, A, Mistry, A, Nieminen, P, Pakarinen, J, Papadakis, P, Peura, P, Rey-Herme, E, Rahkila, P, Rubert, J, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Sorri, J, Stolze, S, Uusitalo, J, Vandebrouck, M, Ward, A, Zielinska, M, Bally, B, Bender, M, and Ryssens, W

Published
2020

30. Stability of the heaviest elements: K isomer in No-250

Author

Kallunkathariyil, J, Sulignano, B, Greenlees, PT, Khuyagbaatar, J, Theisen, Ch, Auranen, K, Badran, H, Bisso, F, Brionnet, P, Briselet, R, Drouart, A, Favier, Z, Goigoux, T, Grahn, T, Hauschild, K, Herzan, A, Hessberger, FP, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, Lightfoot, A, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Rezynkina, K, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Siciliano, M, Sorri, J, Stolze, S, Svirikhin, AI, Uusitalo, J, Vandebrouck, M, Ward, A, Wraith, C, and Zielinska, M

Published
2020

31. In-beam γ-ray and electron spectroscopy of Md249,251

Author

Briselet, R., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Cox, D. M., Déchery, F., Drouart, A., Favier, Z., Gall, B., Goigoux, T., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Herzberg, R.-D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lopez-Martens, A., Mistry, A., Nieminen, P., Pakarinen, J., Papadakis, P., Peura, P., Rey-Herme, E., Rahkila, P., Rubert, J., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Vandebrouck, M., Ward, A., Zielińska, M., Bally, B., Bender, M., and Ryssens, W.

Subjects
electromagnetic transitions, spektroskopia, nuclear spin and parity, collective levels, ydinfysiikka
Abstract

The odd-Z 251Md nucleus was studied using combined γ-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the [521]1/2− configuration, another rotational structure has been identified using γ−γ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a [514]7/2− single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of ≃60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely gK=0.69+0.19−0.16 for the ground-state band. The odd-Z 249Md was studied using γ-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the Δl=Δj=3 [521]3/2− and [633]7/2+ Nilsson orbitals were found in both 249,251Md. A surprising similarity of the 251Md ground-state band transition energies with those of the excited band of 255Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands. peerReviewed

Published
2020

32. Stability of the heaviest elements: $K$ isomer in $^{250}\mathrm{No}$

Author

Kallunkathariyil, J., Sulignano, B., Greenlees, P.T., Khuyagbaatar, J., Theisen, Ch., Auranen, K., Badran, H., Bisso, F., Brionnet, P., Briselet, R., Drouart, A., Favier, Z., Goigoux, T., Grahn, T., Hauschild, K., Herzan, A., Heßberger, F.P., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rezynkina, K., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Siciliano, M., Sorri, J., Stolze, S., Svirikhin, A.I., Uusitalo, J., Vandebrouck, M., Ward, A., Wraith, C., Zielińska, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Experiment, Nuclear Structure
Abstract

International audience; Decay spectroscopy of $^{250}\mathrm{No}$ has been performed using digital electronics and pulse-shape analysis of the fast nuclear decays for the first time. Previous studies of $^{250}\mathrm{No}$ reported two distinct fission decay lifetimes, related to the direct fission of the ground state and to the decay of an isomeric state but without the possibility to determine if the isomeric state decayed directly via fission or via internal electromagnetic transitions to the ground state. The data obtained in the current experiment allowed the puzzle to finally be resolved, attributing the shorter half-life of $t_{1/2}=3.8 \pm 0.3 \mu s$ to the ground state and the longer half-life $t_{1/2}=34.9^{+3.9}_{-3.2} \mu s$ to the decay of an isomeric state. $^{250}\mathrm{No}$ becomes, thus, one of a very few examples of very heavy nuclei with an isomeric state living considerably longer than its ground state. This phenomenon has important consequences for the nuclear-structure models aiming to determine the borders of the island of stability of superheavy elements.

Published
2020

33. In-beam γ-ray and electron spectroscopy of ²⁴⁹,²⁵¹Md

Author

Briselet, R. (R.), Theisen, C. (Ch), Sulignano, B. (B.), Airiau, M. (M.), Auranen, K. (K.), Cox, D. M. (D. M.), Dechery, F. (F.), Drouart, A. (A.), Favier, Z. (Z.), Gall, B. (B.), Goigoux, T. (T.), Grahn, T. (T.), Greenlees, P. T. (P. T.), Hauschild, K. (K.), Herzan, A. (A.), Herzberg, R.-D. (R-D), Jakobsson, U. (U.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Leino, M. (M.), Lopez-Martens, A. (A.), Mistry, A. (A.), Nieminen, P. (P.), Pakarinen, J. (J.), Papadakis, P. (P.), Peura, P. (P.), Rey-Herme, E. (E.), Rahkila, P. (P.), Rubert, J. (J.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Stolze, S. (S.), Uusitalo, J. (J.), Vandebrouck, M. (M.), Ward, A. (A.), Zielinska, M. (M.), Bally, B. (B.), Bender, M. (M.), and Ryssens, W. (W.)

Abstract

The odd-Z ²⁵¹Md nucleus was studied using combined γ-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the [521]1/2⁻ configuration, another rotational structure has been identified using γ−γ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a [514]7/2⁻ single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of ≃60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely \(g_{K}=0.69^{+0.19}_{−0.16}\) for the ground-state band. The odd-Z ²⁴⁹Md was studied using γ-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the Δl=Δj=3 [521]3/2⁻ and [633]7/2⁺ Nilsson orbitals were found in both ²⁴⁹,²⁵¹Md. A surprising similarity of the²⁵¹Md ground-state band transition energies with those of the excited band of ²⁵⁵Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands.

Published
2020

34. Stability of the heaviest elements : K isomer in 250No

Author

Kallunkathariyil, J., Sulignano, B., Greenlees, P. T., Khuyagbaatar, J., Theisen, Ch., Auranen, K., Badran, H., Bisso, F., Brionnet, P., Briselet, R., Drouart, A., Favier, Z., Goigoux, T., Grahn, T., Hauschild, K., Herzan, A., Heßberger, F. P., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rezynkina, K., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Siciliano, M., Sorri, J., Stolze, S., Svirikhin, A. I., Uusitalo, J., Vandebrouck, M., Ward, A., Wraith, C., and Zielińska, M.

Subjects
isomer decays, ydinfysiikka, nuclear structure and decays
Abstract

Decay spectroscopy of 250No has been performed using digital electronics and pulse-shape analysis of the fast nuclear decays for the first time. Previous studies of 250No reported two distinct fission decay lifetimes, related to the direct fission of the ground state and to the decay of an isomeric state but without the possibility to determine if the isomeric state decayed directly via fission or via internal electromagnetic transitions to the ground state. The data obtained in the current experiment allowed the puzzle to finally be resolved, attributing the shorter half-life of t1/2 = 3.8 ± 0.3 μs to the ground state and the longer half-life t1/2 = 34.9+3.9 −3.2 μs to the decay of an isomeric state. 250No becomes, thus, one of a very few examples of very heavy nuclei with an isomeric state living considerably longer than its ground state. This phenomenon has important consequences for the nuclear-structure models aiming to determine the borders of the island of stability of superheavy elements. peerReviewed

Published
2020

35. Alpha-gamma decay studies of 255Rf, 251No and 247Fm

Author

Heßberger, F. P., Hofmann, S., Ackermann, D., Antalic, S., Kindler, B., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Nishio, K., Popeko, A. G., Sulignano, B., Saro, S., Streicher, B., Venhart, M., and Yeremin, A. V.

Published
2006
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37. Measurement of evaporation residue cross-sections of the reaction 30Si + 238U at subbarrier energies

Author

Nishio, K., Hofmann, S., Heßberger, F. P., Ackermann, D., Antalic, S., Comas, V. F., Gan, Z., Heinz, S., Heredia, J. A., Ikezoe, H., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kuusiniemi, P., Lommel, B., Mann, R., Mazzocco, M., Mitsuoka, S., Nagame, Y., Ohtsuki, T., Popeko, A. G., Saro, S., Schött, H. J., Sulignano, B., Svirikhin, A., Tsukada, K., Tsuruta, K., and Yeremin, A. V.

Published
2006
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41. In-beam γ -ray and electron spectroscopy of Md249,251

Author

Briselet, R., primary, Theisen, Ch., additional, Sulignano, B., additional, Airiau, M., additional, Auranen, K., additional, Cox, D. M., additional, Déchery, F., additional, Drouart, A., additional, Favier, Z., additional, Gall, B., additional, Goigoux, T., additional, Grahn, T., additional, Greenlees, P. T., additional, Hauschild, K., additional, Herzan, A., additional, Herzberg, R.-D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, Lopez-Martens, A., additional, Mistry, A., additional, Nieminen, P., additional, Pakarinen, J., additional, Papadakis, P., additional, Peura, P., additional, Rey-Herme, E., additional, Rahkila, P., additional, Rubert, J., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Uusitalo, J., additional, Vandebrouck, M., additional, Ward, A., additional, Zielińska, M., additional, Bally, B., additional, Bender, M., additional, and Ryssens, W., additional

Published
2020
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42. Stability of the heaviest elements: K isomer in No250

Author

Kallunkathariyil, J., primary, Sulignano, B., additional, Greenlees, P. T., additional, Khuyagbaatar, J., additional, Theisen, Ch., additional, Auranen, K., additional, Badran, H., additional, Bisso, F., additional, Brionnet, P., additional, Briselet, R., additional, Drouart, A., additional, Favier, Z., additional, Goigoux, T., additional, Grahn, T., additional, Hauschild, K., additional, Herzan, A., additional, Heßberger, F. P., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, Lightfoot, A., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Rezynkina, K., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Saren, J., additional, Scholey, C., additional, Siciliano, M., additional, Sorri, J., additional, Stolze, S., additional, Svirikhin, A. I., additional, Uusitalo, J., additional, Vandebrouck, M., additional, Ward, A., additional, Wraith, C., additional, and Zielińska, M., additional

Published
2020
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43. First observation of high-K isomeric states in 249Md and 251Md.

Author

Goigoux, T., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Badran, H., Briselet, R., Calverley, T., Cox, D., Déchery, F., Bisso, F. Defranchi, Drouart, A., Favier, Z., Gall, B., Grahn, T., Greenlees, P. T., Hauschild, K., Herzáň, A., Herzberg, R.-D., and Jakobsson, U.

Subjects
ELECTROMAGNETIC measurements, FERMI surfaces, SPECTROMETRY
Abstract

Decay spectroscopy of the odd-proton nuclei 249 Md and 251 Md has been performed. High-K isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of 2.8(5) ms and an excitation energy ≥ 910 keV was found in 249 Md. In 251 Md, an isomeric state with a half-life of 1.4(3) s and an excitation energy ≥ 844 keV was found. Similarly to the neighbouring 255 Lr, these two isomeric states are interpreted as 3 quasi-particle high-K states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen–Cooper–Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods–Saxon potential. The most probable candidates for the configurations of K-isomeric states in Md nuclei are proposed. [ABSTRACT FROM AUTHOR]

Published
2021
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44. Production cross section and decay study of Es-243 and Md-249

Author

Briselet, R, Theisen, Ch, Vandebrouck, M, Marchix, A, Airiau, M, Auranen, K, Badran, H, Boilley, D, Calverley, T, Cox, D, Dechery, F, Bisso, F Defranchi, Drouart, A, Gall, B, Goigoux, T, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Herzberg, RD, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, Lightfoot, A, Lopez-Martens, A, Mistry, A, Nieminen, P, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Rubert, J, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Sorri, J, Stolze, S, Sulignano, B, Uusitalo, J, Ward, A, Zielinska, M, University of Helsinki, University of Jyväskylä, and University of Helsinki, Laboratory of Radiochemistry

Subjects
114 Physical sciences
Abstract

In the study of the odd-Z, even-N nuclei Es-243 and Md-249, performed at the University of Jyvaskyla, the fusion-evaporation reactions Au-197(Ca-48, 2n)Es-243 and Tl-203(Ca-48, 2n) Md-249 have been used for the first time. Fusion-evaporation residues were selected and detected using a gas-filled separator coupled with its focal-plane spectrometer. For Es-243, the recoil decay correlation analysis yielded a half-life of 24 +/- 3 s and a maximum production cross section of 37 +/- 10 nb. In the same way, a half-life of 26 +/- 1 s, an alpha-branching ratio of 75 +/- 5%, and a maximum production cross section of 300 +/- 80 nb were determined for Md-249. The decay properties of Es-245, the daughter of Md-249, were also measured: an alpha-branching ratio of 54 +/- 7% and a half-life of 65 +/- 6 s. Experimental cross sections were compared to the results of calculations performed using the KEWPIE2 statistical fusion-evaporation code.

Published
2019

45. Production cross section and decay study of $^{243}$Es and $^{249}$Md

Author

Briselet, R., Theisen, Ch., Vandebrouck, M., Marchix, A., Airiau, M., Auranen, K., Badran, H., Boilley, D., Calverley, T., Cox, D., Déchery, F., Defranchi Bisso, F., Drouart, A., Gall, B., Goigoux, T., Grahn, T., Greenlees, P.T., Hauschild, K., Herzan, A., Herzberg, R.D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Lopez-Martens, A., Mistry, A., Nieminen, P., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rubert, J., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Sulignano, B., Uusitalo, J., Ward, A., Zielińska, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ydinreaktiot, alpha decay, Nuclear Reactions, FOS: Physical sciences, low and intermediate energy heavy-ion reactions, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

In the study of the odd-$Z$, even-$N$ nuclei $^{243}$Es and $^{249}$Md, performed at the University of Jyv\"askyl\"a, the fusion-evaporation reactions $^{197}$Au($^{48}$Ca,2$n$)$^{243}$Es and $^{203}$Tl($^{48}$Ca,2$n$)$^{249}$Md have been used for the first time. Fusion-evaporation residues were selected and detected using the RITU gas-filled separator coupled with the focal-plane spectrometer GREAT. For $^{243}$Es, the recoil decay correlation analysis yielded a half-life of $24 \pm 3$s, and a maximum production cross section of $37 \pm 10$ nb. In the same way, a half-life of $26 \pm 1$ s, an $\alpha$ branching ratio of 75 $\pm$ 5%, and a maximum production cross section of 300 $\pm$ 80 nb were determined for $^{249}$Md. The decay properties of $^{245}$Es, the daughter of $^{249}$Md, were also measured: an $\alpha$ branching ratio of 54 $\pm$ 7% and a half-life of 65 $\pm$ 6 s. Experimental cross sections were compared to the results of calculations performed using the KEWPIE2 statistical fusion-evaporation code.

Published
2019

46. Lifetime measurements on fission fragments in the A ∼ 100 region

Author

Grente L., Salsac M.-D., Korten W., Görgen A., Hagen T. W., Braunroth T., Bruyneel B., Celikovic I., Clément E., Delaune O., Dijon A., Drouart A., Ertürk S., Farget F., de France G., Gottardo A., Hackstein M., Jacquot B., Libert J., Litzinger J., Ljungvall J., Louchart C., Michelagnoli C., Napoli D.R., Navin A., Pillet N., Pipidis A., Recchia F., Rejmund M., Rother W., Sahin E., Schmitt C., Siem S., Sulignano B., Valiente-Dobon J.J., and Zell K.O.

Subjects
Physics, QC1-999
Abstract

Lifetimes of first 4+ and 6+ states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and γ-rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1–100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region.

Published
2013
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47. Evidence for Coexisting Shapes through Lifetime Measurements in $^{98}\mathrm{Zr}$

Author

Singh, P, Korten, W, Hagen, TW, Görgen, A, Grente, L, Salsac, M-D, Farget, F, Clément, E, de France, G, Braunroth, T, Bruyneel, B, Celikovic, I, Delaune, O, Dewald, A, Dijon, A, Delaroche, J-P, Girod, M, Hackstein, M, Jacquot, B, Libert, J, Litzinger, J, Ljungvall, J, Louchart, C, Gottardo, A, Michelagnoli, C, Müller-Gatermann, C, Napoli, DR, Otsuka, T, Pillet, N, Recchia, F, Rother, W, Sahin, E, Siem, S, Sulignano, B, Togashi, T, Tsunoda, Y, Theisen, C, and Valiente-Dobon, JJ

Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state. ispartof: PHYSICAL REVIEW LETTERS vol:121 issue:19 pages:192501-192501 ispartof: location:United States status: published

Published
2018

48. In-beam spectroscopic study of $^{244}$Cf

Author

Konki, J., Sulignano, B., Greenlees, P. T., Theisen, Ch., Auranen, K., Badran, H., Briselet, R., Cox, D. M., Bisso, F. Defranchi, Dobaczewski, Jacek Jan, Grahn, T., Herzan, A., Herzberg, R.-D., Julin, R., Juutinen, S., Khuyagbaatar, J., Leino, M., Lightfoot, A., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Sandzelius, M., Saren, J., Scholey, C., Shi, Y., Smolen, M., Sorri, J., Stolze, S., Uusitalo, J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
level densities, alpha decay, electromagnetic transitions, Nuclear Theory, lifetimes, widths, ddc:530, energy levels, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, Nuclear Experiment
Abstract

The ground-state rotational band of the neutron-deficient californium ( Z = 98 ) isotope 244 Cf was identified for the first time and measured up to a tentative spin and parity of I π = 20 + . The observation of the rotational band indicates that the nucleus is deformed. The kinematic and dynamic moments of inertia were deduced from the measured γ -ray transition energies. The behavior of the dynamic moment of inertia revealed an up-bend due to a possible alignment of coupled nucleons in high- j orbitals starting at a rotational frequency of about ℏ ω = 0.20 MeV . The results were compared with the systematic behavior of the even-even N = 146 isotones as well as with available theoretical calculations that have been performed for nuclei in the region. peerReviewed

Published
2018

49. Evidence for coexisting shapes through lifetime measurements in 98Zr

Author

Singh, Purnima, Korten, Wolfram, Hagen, Trine Wiborg, Görgen, Andreas, Grente, Lucie, Salsac, Marie Delphine, Farget, F., Braunroth, T, Bruyneel, Bart, Celikovic, I, Clement, E, de France, G., Delaune, O, Dewald, Alfred, Dijon, Aurore, Delaroche, Jean Paul, Girod, Michel, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J, Ljungvall, Joa, Louchart, C, Gottardo, Andrea, Michelagnoli, Caterina, Napoli, D.R., Otsuka, Takaharu, Pillet, N., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, B, Togashi, T., Theisen, Christophe, and Valiente-Dobón, Jose Javier

Subjects
Nuclear Experiment
Abstract

The lifetimes of the first excited 2þ, 4þ, and 6þ states in 98Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in 98Zr were populated using the fission reaction between a 6.2 MeV=u 238U beam and a 9 Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small BðE2; 2þ 1 → 0þ 1 Þ value in 98Zr, thereby confirming the very sudden onset of collectivity at N ¼ 60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2018

50. Evidence for Coexisting Shapes through Lifetime Measurements in $^{98}$Zr

Author

Singh, Purnima, Korten, W., Hagen, T.W., Görgen, A., Grente, L., Salsac, M.-D., Farget, F., Clément, E., De France, G., Braunroth, T., Bruyneel, B., Celikovic, I., Delaune, O., Dewald, A., Dijon, A., Delaroche, J.-P., Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Müller-Gatermann, C., Napoli, D.R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch., Valiente-Dobon, J.J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics and Astronomy (all), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2018

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