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151. The PanEDM neutron electric dipole moment experiment at the ILL.

Author

Jenke, T., Degenkolb, S., Jentschel, M., Nesvizhevsky, V.V., Rebreyend, D., Roccia, S., Soldner, T., Stutz, A., Zimmer, O., Wurm, David, Beck, Douglas H., Chupp, Tim, Degenkolb, Skyler, Fierlinger, Katharina, Fierlinger, Peter, Filter, Hanno, Ivanov, Sergey, Klau, Christopher, Kreuz, Michael, and Lelièvre-Berna, Eddy

Subjects
ELECTRIC dipole moments, NEUTRONS, MAGNETIC fields, DAMPING (Mechanics), DETECTORS
Abstract

The neutron's permanent electric dipole moment dn is constrained to below 3 × 10−26e cm (90% C.L.) [1, 2], by experiments using ultracold neutrons (UCN). We plan to improve this limit by an order of magnitude or more with PanEDM, the first experiment exploiting the ILL's new UCN source SuperSUN. SuperSUN is expected to provide a high density of UCN with energies below 80 neV, implying extended statistical reach with respect to existing sources, for experiments that rely on long storage or spin-precession times. Systematic errors in PanEDM are strongly suppressed by passive magnetic shielding, with magnetic field and gradient drifts at the single fT level. A holding-field homogeneity on the order of 10−4 is achieved in low residual fields, via a high static damping factor and built-in coil system. No comagnetometer is needed for the first order-of-magnitude improvement in dn, thanks to high magnetic stability and an assortment of sensors outside the UCN storage volumes. PanEDM will be commissioned and upgraded in parallel with SuperSUN, to take full advantage of the source's output in each phase. Commissioning is ongoing in 2019, and a new limit in the mid 10−27e cm range should be possible with two full reactor cycles of data in the commissioned apparatus. [ABSTRACT FROM AUTHOR]

Published
2019
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152. The pulsed neutron beam EDM experiment.

Author

Jenke, T., Degenkolb, S., Jentschel, M., Nesvizhevsky, V.V., Rebreyend, D., Roccia, S., Soldner, T., Stutz, A., Zimmer, O., Chanel, Estelle, Hodge, Zachary, Ries, Dieter, Schulthess, Ivo, Solar, Marc, Soldner, Torsten, Stalder, Oliver, Thorne, Jacob, and Piegsa, Florian M.

Subjects
ELECTRIC dipole moments, PULSED neutron techniques, ULTRACOLD neutrons, ATOMIC beams, MAGNETIC fields
Abstract

We report on the Beam EDM experiment, which aims to employ a pulsed cold neutron beam to search for an electric dipole moment instead of the established use of storable ultracold neutrons. We present a brief overview of the basic measurement concept and the current status of our proof-of-principle Ramsey apparatus. [ABSTRACT FROM AUTHOR]

Published
2019
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153. The neutron electric dipole moment experiment at the Spallation Neutron Source.

Author

Jenke, T., Degenkolb, S., Jentschel, M., Nesvizhevsky, V.V., Rebreyend, D., Roccia, S., Soldner, T., Stutz, A., Zimmer, O., Leung, K.K.H., Ahmed, M., Alarcon, R., Aleksandrova, A., Baeßler, S., Barrón-Palos, L., Bartoszek, L., Beck, D.H., Behzadipour, M., Bessuille, J., and Blatnik, M.A.

Subjects
ELECTRIC dipole moments, NEUTRONS, SPALLATION (Nuclear physics), ELECTRIC field strength, ULTRACOLD neutrons
Abstract

Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error control. The nEDM experiment at the Spallation Neutron Source (nEDM@SNS) will implement the scheme of Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. The unique properties of combining polarized ultracold neutrons, polarized 3He, and superfluid 4He will be exploited to provide a sensitivity to ∼ 10−28 e · cm. Our cryogenic apparatus will deploy two small (3 L) measurement cells with a high density of ultracold neutrons produced and spin analyzed in situ. The electric field strength, precession time, magnetic shielding, and detected UCN number will all be enhanced compared to previous room temperature Ramsey measurements. Our 3He co-magnetometer offers unique control of systematic effects, in particular the Bloch-Siegert induced false EDM. Furthermore, there will be two distinct measurement modes: free precession and dressed spin. This will provide an important self-check of our results. Following five years of "critical component demonstration," our collaboration transitioned to a "large scale integration" phase in 2018. An overview of our measurement techniques, experimental design, and brief updates are described in these proceedings. [ABSTRACT FROM AUTHOR]

Published
2019
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154. nEDM experiment at PSI: Data-taking strategy and sensitivity of the dataset.

Author

Jenke, T., Degenkolb, S., Jentschel, M., Nesvizhevsky, V.V., Rebreyend, D., Roccia, S., Soldner, T., Stutz, A., Zimmer, O., Abel, C., Ayres, N.J., Ban, G., Bison, G., Bodek, K., Bondar, V., Chanel, E., Chiu, P.-J., Daum, M., Emmenegger, S., and Ferraris-Bouchez, L.

Subjects
SENSITIVITY analysis, ELECTRIC dipole moments, MAGNETIC fields, MAGNETOMETERS, ULTRACOLD neutrons
Abstract

We report on the strategy used to optimize the sensitivity of our search for a neutron electric dipole moment at the Paul Scherrer Institute. Measurements were made upon ultracold neutrons stored within a single chamber at the heart of our apparatus. A mercury cohabiting magnetometer together with an array of cesium magnetometers were used to monitor the magnetic field, which was controlled and shaped by a series of precision field coils. In addition to details of the setup itself, we describe the chosen path to realize an appropriate balance between achieving the highest statistical sensitivity alongside the necessary control on systematic effects. The resulting irreducible sensitivity is better than 1 × 10−26e cm. This contribution summarizes in a single coherent picture the results of the most recent publications of the collaboration. [ABSTRACT FROM AUTHOR]

Published
2019
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155. Happy birthday, ultra-cold neutron!

Author

Jenke, T., Degenkolb, S., Jentschel, M., Nesvizhevsky, V.V., Rebreyend, D., Roccia, S., Soldner, T., Stutz, A., Zimmer, O., Abele, Hartmut, Jenke, Tobias, and Lemmel, Hartmut

Subjects
METAPHYSICAL cosmology, NEUTRONS, INTONATION (Musical pitch), PLANCK'S constant, MUSIC theory
Abstract

What is driving the accelerated expansion of the universe and do we have an alternative for Einstein's cosmological constant? What is dark matter made of? Do extra dimensions of space and time exist? Is there a preferred frame in the universe? To which extent is left-handedness a preferred symmetry in nature? What's the origin of the baryon asymmetry in the universe? These fundamental and open questions are addressed by precision experiments using ultra-cold neutrons. This year, we celebrate the 50th anniversary of their first production, followed by first pioneering experiments. Actually, ultra-cold neutrons were discovered twice in the same year – once in the eastern and once in the western world [1, 2]. For five decades now research projects with ultra-cold neutrons have contributed to the determination of the force constants of nature's fundamental interactions, and several technological breakthroughs in precision allow to address the open questions by putting them to experimental test. To mark the event and tribute to this fabulous object, we present a birthday song for ultra-cold neutrons with acoustic resonant transitions [3], which are based solely on properties of ultra-cold neutrons, the inertial and gravitational mass of the neutron m, Planck's constant h, and the local gravity g. We make use of a musical intonation system that bears no relation to basic notation and basic musical theory as applied and used elsewhere [4] but addresses two fundamental problems of music theory, the problem of reference for the concert pitch and the problem of intonation. [ABSTRACT FROM AUTHOR]

Published
2019
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156. A new limit of the 129Xenon Electric Dipole Moment.

Author

Jenke, T., Degenkolb, S., Jentschel, M., Nesvizhevsky, V.V., Rebreyend, D., Roccia, S., Soldner, T., Stutz, A., Zimmer, O., Allmendinger, Fabian, Engin, Ilhan, Grasdijk, Olivier, Heil, Werner, Jungmann, Klaus, Karpuk, Sergei, Krause, Hans-Joachim, Niederländer, Benjamin, Offenhäusser, Andreas, Repetto, Maricel, and Schmidt, Ulrich

Subjects
ELECTRIC dipole moments, XENON, MAGNETOMETERS, MAGNETIC fields, DIAMAGNETIC materials
Abstract

We report on the first preliminary result of our 129Xe EDM measurement performed by the MIXed collaboration. The aim of this report is to demonstrate the feasibility of a new method to set limits on nuclear EDMs by investigating the EDM of the diamagnetic 129Xe atoms. In our setup, hyperpolarized 3He serves as a comagnetometer needed to suppress magnetic field fluctuations. The free induction decay of the two polarized spin species is directly measured by low noise DC SQUIDs, and the weighted phase difference extracted from these measurements is used to determine a preliminary upper limit on the 129Xe EDM. [ABSTRACT FROM AUTHOR]

Published
2019
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157. The $\gamma-\gamma$ fast-timing technique and the EXILL&FATIMA campaign

Author

Régis, J.-M., Simpson, G.S., Mach, H., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., De France, G., Ur, C.A., Urban, W., Jolie, J., Saed-Samii, N., Warr, N., Fraile, L.M., Paziy, V., Regan, P.H., Podolyák, Zs., Lalkovski, S., Bruce, A.M., Kröll, T., Korten, W., Marginean, N., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Laue-Langevin (ILL), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), ILL, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; At the Institut Laue-Langevin in Grenoble, germanium-gated γ-γ fast-timing lifetime measurements of nuclear excited states in neutron-rich nuclei have been performed within a prompt γ-ray spectroscopy experimental campaign. We report on results obtained from the cold-neutron induced fission of 235U. The excited secondary fission products were stopped almost instantaneously within the thick target and the γ rays emitted were collected triggerlessly using the EXILL&FATIMA mixed array of HPGe and LaBr3(Ce) detectors. Precise lifetimes could be determined by analysing the γ-γ time difference spectra using the generalized centroid difference method. This picosecondsensitive method provides many advantages and is briefly explained. Still, the major source of systematic errors is related to the contribution of time-correlated Compton background. The EXILL&FATIMA results are discussed with respect to the typical energy-dependent timing behaviour of the background. According to the time response of the background, appropriate methods and a time correction for the sub-nanosecond regime are proposed.

Published
2017
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158. Spectroscopy of neutron-rich $^{194,96}$Y isotope produced in fission induced by cold neutrons

Author

Iskra, L.W., Fornal, B., Leoni, S., Bocchi, G., Blanc, A., Bottoni, S., Cieplicka-Oryńczak, N., Jentschel, M., Köster, U., Michelagnoli, C., Mutti, P., Soldner, T., De France, G., Simpson, G.S., Ur, C.A., Urban, W., Polish Academy of Sciences (PAN), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Institut Laue-Langevin (ILL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Warsaw University of Technology [Warsaw], Vernay, Emmanuelle, ILL, 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), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS)

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

International audience; The onset of the deformation in neutron-rich nuclei around A = 100 mass region has for many years remainedone of the most interesting subjects for nuclear spectroscopy study. For the neutron number N = 60, a sudden onsetof the deformation has been observed at the ground state, which is manifested by the presence of rotational bands(e.g. [1]). On the other hand the occurrence of shape coexistence in nuclei with N = 58 and 59, in this region (e.g.[2]), suggests that the evolution of the deformation is a more gradual process. In the yttrium isotopic chain, arotational band above the 4-, 496-keV isomer has been observed in the N = 59, 98Y nucleus, while there was noevidence of the deformed structure in the Y isotopes with neutron number less than N = 59. Our goal was toinvestigate N = 57, 96Y isotope where only a few states were known from beta decay study of 96Sr [3] as well as thelong 9.6-s (1140-keV) isomer [4]. Additionally, we decided to investigate whether deformed structures are stillpresent in the 94Y nucleus which lies 5 neutrons away from the N=60 boundary. So far, very little spectroscopicinformation has been gathered on 94Y – what regards higher spin yrast excitations established was only the presenceof the 1.35-μs, (5+) isomer at 1202 keV excitation energy [5]. This isomer could be used as a starting point for theidentification of structures on top of it.The yttrium-94 and 96 isotopes have been produced by fission of 235U and 241Pu targets induced by coldneutron from the reactor at Institut Laue-Langevin. The level scheme up to excitation energies in excess of 5 MeVhas been established based on multi-fold gamma-ray coincidence relationships measured with the EXILLspectrometer [6] which consists of up to 46 HPGe detectors. By exploiting delayed- and cross-coincidencetechniques, extensive structure has been delineated. During the analysis, over 50 new gamma transitions which feedpreviously known low-spin states as well as the long 9.6-s, 8+ isomer in 96Y isotope have been identified. Moreover,a new isomeric state at 1655-keV excitation energy has been located with half-life of 201 ns. Angular correlationanalysis allows to define spin-parity assignment for most of the identified levels, in particular (6+) for new isomer.By using the delayed-coincidence method it was possible to identify above the 201-ns state a few weak transitions,which seem to form a rotational band, in analogy to the structure above the 4- isomer in the 98Y isotope. In the caseof 94Y isotope over 11 new gamma transitions, which feed the previously known (5+) isomer, have been identified.Angular correlation analysis supported by shell-model consideration allowed to propose spin-parity assignmentsfor some of the new levels.The existence of the new isomeric state and the possible deformed band built on that isomer in the N = 57, 96Yisotope shed new light on the study of the onset of deformation in neutron-rich nuclei around N = 60. It shows thatthe deformed structures appear just after the subshell closure at N = 56 and evolve smoothly when passing throughN = 57-59 isotopes, to became a ground state structure in the 99Y isotope, i.e., at N = 60. The findings are in linewith the 94Y results where only spherical structures are present at low excitation energy.

Published
2017

159. Half-life of the 15/2(+) state of I-135: A test of E2 seniority relations

Author

Spagnoletti, P, Simpson, GS, Carroll, R, Regis, J-M, Blanc, A, Jentschel, M, Koster, U, Mutti, P, Soldner, T, de France, G, Ur, CA, Urban, W, Bruce, AM, Drouet, F, Fraile, LM, Gaffney, LP, Ghita, DG, Ilieva, S, Jolie, J, Korten, W, Kroell, T, Larijarni, C, Lalkovski, S, Lica, R, Mach, H, Marginean, N, Paziy, V, Podolyak, Zs, Regan, PH, Scheck, M, Saed-Samii, N, Thiamova, G, Townsley, C, Vancraeyenest, A, Vedia, V, Gargano, A, and Van Isacker, P

Published
2017

160. Abrupt shape transition at neutron number N = 60 : B ( E 2 ) values in $^{ 94 , 96 , 98}$Sr from fast $\gamma − \gamma$ timing

Author

Régis, M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., De France, G., Clément, E., Stezowski, O., Ur, A., Urban, W., Regan, H., Podolyák, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A., Roberts, O. J., Smith, J. F., Scheck, M., Kröll, T., Hartig, A., Ignatov, A., Ilieva, S., Lalkovski, S., Korten, W., Mărginean, N., Otsuka, T., Shimizu, N., Togashi, T., Tsunoda, Y., Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Grand Accélérateur National d'Ions Lourds (GANIL), 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 de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-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), 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 Claude Bernard Lyon 1 (UCBL), and 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)

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

International audience; Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.

Published
2017
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161. Shape coexistence in the odd-odd nucleus $^{98}\mathrm{Y}$: The role of the ${g}_{9/2}$ neutron extruder

Author

Urban, W., Czerwiński, M., Kurpeta, J., Rząca-Urban, T., Wiśniewski, J., Materna, T., Iskra, Ł. W., Smith, A.G., Ahmad, I., Blanc, A., Faust, H., Köster, U., Jentschel, M., Mutti, P., Soldner, T., Simpson, G.S., Pinston, J.A., De France, G., Ur, C.A., Elomaa, V.V., Eronen, T., Hakala, J., Jokinen, A., Kankainen, A., Moore, I.D., Rissanen, J., Saastamoinen, A., Szerypo, J., Weber, C., Äystö, 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, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Grand Accélérateur National d'Ions Lourds (GANIL), 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 Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), 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 Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

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

International audience; Excited states in $^{98}$Y, populated in neutron-induced fission of U$^{235}$ and in spontaneous fission of $^{248}$Cm and $^{252}$Cf, have been studied by means of $\gamma$ spectroscopy using the Lohengrin fission-fragment separator at ILL Grenoble and the EXILL, Eurogam2, and Gammasphere Ge arrays. Two new isomers have been found in $^{98}$Y: a deformed one with T$_{1/2}$=180(7) ns and a rotational band on top of it, and a spherical one with T$_{1/2}$=0.45(15)μs, analogous to the 8$^+$ isomer in $^{96}$Y, corresponding to the (νg7/2,πg$_{9/2}$)8$^+$ spherical configuration. Using the JYFLTRAP Penning trap, an accurate excitation energy of 465.7(7) keV has been determined for the 2.36-s isomer in $^{98}$Y. This result and the studies of excited levels in $^{98}$Zr, populated in β$^−$ decay of the isomer, indicate a new spin-parity, Iπ=(7)$^+$ for the isomer. The high spin and the decay properties of this isomer suggest the presence of the 9/2$^+$[404] neutron extruder orbital in its structure. This is consistent with the large deformation of the isomer, reported recently. The present work does not provide arguments to support the special role of the νg7/2-πg$_{9/2}$ interaction (the spin-orbit-partner, or SOP, mechanism).

Published
2017
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162. Structure of $^{90,91}$Kr nuclei: Solving the puzzle of their population in fission

Author

Rząca-Urban, T., Sieja, K., Urban, W., Czerwiński, M., Blanc, A., Jentschel, M., Mutti, P., Köster, U., Soldner, T., De France, G., Simpson, G.S., Ur, C.A., Institut Laue-Langevin (ILL), ILL, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), 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)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

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

International audience; Excited states of $^{90,91}$Kr nuclei have been populated following the cold-neutron-induced fission of a $^{235}$U target. The γ rays emitted following fission reactions were measured using the highly efficient array of high-purity Ge detectors, EXILL, at the Institute-Laue-Langevin, Grenoble. The surprisingly low population of $^{91}$Kr reported in the spontaneous fission of $^{252}$Cf measurement has been explained and new level schemes of $^{90,91}$Kr nuclei were established. Moderate γ collectivity is observed in both nuclei. Large-scale shell-model calculations support the experimental picture of the Z=36, Kr isotopes forming a border line between lower-Z nuclei showing moderate γ collectivity and the heavier-Z nuclei, where distinct shape changes are observed.

Published
2017
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163. EXILL - a high efficiency, high resolution setup for γ-spectroscopy at an intense cold neutron beam

Author

Jentschel, M., Blanca, A., France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astieri, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka, N., Clement, E., Cooper, N., Crespic, F., Csatlos, M., Czerwinski, M., Danu, L., Davies, A., Didierjean, F., Drouet, F., Duchene, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B., John, R., Jolie, J., Kisyov, S., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kutiu, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Magron, C., Mancuso, C., Ruiz Martinez, E., Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsacq, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timaru, J., Toml, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
235U, Ge detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, neutron-induced fission, multiple-γ coincidences, (n,γ)-reactions, 241Pu, angular correlations
Abstract

In the EXILL campaign a highly efficient array of HPGe detectors was operated at the cold neutron beam instrument PF1B of the Institut Laue-Langevin to carry out nuclear structure studies, via measurements of -rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 s-1 cm-2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two smaller clover detectors. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The trigger-less acquisition system allowed an event collection rate of up to 6 × 105 Hz. From triggerless collected data it was possible to construct decay schemes and in combination with the FATIMA array of LaBr3 detectors to analyze half-lives of excited levels in the pico- to micro-second range. Precise energy and efficiency calibrations of EXILL were performed using 27Al(n,γ)28Al and 35Cl(n,γ)36Cl reactions in the energy range from 30 keV up to 10 MeV.

Published
2017

164. Ultra high precision refractive index measurement of Si at $��$-ray energies up to 2 MeV

Author

G��nther, M. M., Jentschel, M., Pollitt, A. J., Thirolf, P. G., and Zepf, M.

Subjects
Physics::Instrumentation and Detectors, Atomic Physics (physics.atom-ph), Astrophysics::High Energy Astrophysical Phenomena, Physics::Optics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det)
Abstract

The refractive index of silicon at $��$-ray energies from 181 - 1959 keV was investigated using the GAMS6 double crystal spectrometer and found to follow the predictions of the classical scattering model. This is in contrast to earlier measurements on the GAMS5 spectrometer, which suggested a sign-change in the refractive index for photon energies above 500 keV. We present a re-evaluation of the original data from 2011 as well as data from a 2013 campaign in which we show that systematic errors due to diffraction effects of the prism can explain the earlier data., submitted to Physical Review C

Published
2017
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165. Lifetime measurements in $^{162}$Dy

Author

Aprahamian, A., Lesher, S.R., Casarella, C., Börner, H.G., Jentschel, M., Institut Laue-Langevin (ILL), and ILL

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

International audience; Background: The nature of oscillations or excitations around the equilibrium deformed nuclear shape remains an open question in nuclear structure. The Dy162 nucleus is one of the most extensively studied nuclei with the (n,γ), (n,e−), (α,2n) reactions and most recently the (p,t) pickup reaction adding 11 0+ states to an excitation energy of 2.8 MeV to an already-well-developed level scheme. However, a major shortfall for a better understanding of the nature of the plethora of bands and levels in this nucleus has been the lack of lifetime measurements. Purpose: To determine the character of the low-lying excited bands in this Dy162 nucleus, we set out to measure the level lifetimes. Method: Lifetimes were measured in the Dy162 nucleus following neutron capture using the Gamma-Ray-Induced Doppler (GRID) broadening technique at the Institut Laue-Langevin in Grenoble, France. Results: In total, we have measured the lifetimes of 12 levels belonging to a number of excited positive- and negative-parity bands in the low-lying spectrum of the Dy162 nucleus. The lifetime of the Kπ=2+ bandhead at 888.16 keV was previously measured. We confirm this value and measure lifetimes of the 3+ and 4+ members of this band yielding B(E2) values that are consistent with a single γ-vibrational phonon of several Weisskopf units. The first excited Kπ=4+ band, with a bandhead at 1535.66 keV, is strongly connected to the Kπ=2+ band with enhanced collective B(E2) values and it is consistent with a double phonon vibrational (γγ) excitation. Lifetime of Kπ=0+ band members have also been measured, including the 4Kπ=02++ state at 1574.29 keV and the 2Kπ=03++ state at 1728.31 keV. This latter state also displays the characteristics of a double phonon excitation built on the Kπ=2+ band. Conclusions: We discuss our findings in terms of the presence or absence of collective quadrupole and octupole vibrational excitations. We find two positive-parity excited bands at 1535.66 keV (Kπ=4+) and the 1728.312-keV 2+ state of a Kπ=0+ band at 1666 keV connected with sizably collective B(E2) values to the (Kπ=2+)γ band at 888 keV.

Published
2017
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166. Experimental study of the lifetime and phase transition in neutron-rich $^{98,100,102}\mathrm{Zr}$

Author

Ansari, S, Régis, J.-M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., Zielinska, M., Salsac, M.-D., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., de France, G., Clément, E., Stezowski, O., Ur, C.A., Urban, W., Regan, P.H., Podolyák, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Mach, H., Fraile, L.M., Paziy, V., Olaizola, B., Vedia, V., Bruce, A.M., Roberts, O.J., Smith, J.F., Scheck, M., Kröll, T., Hartig, A.-L., Ignatov, A., Ilieva, S., Lalkovski, S., Marginean, N., Otsuka, T., Shimizu, N., Togashi, T., Tsunoda, Y., 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 Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Grand Accélérateur National d'Ions Lourds (GANIL), 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 de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-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), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), 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 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), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

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

International audience; Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N 58 nuclei are nearly spherical, while those with N 60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region.We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A ∼ 100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr,and 102Zr (N 60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.

Published
2017
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167. Shape coexistence in the odd-odd nucleus 98Y : the role of the g9/2 neutron extruder

Author

Urban, W., Czerwinski, M., Kurpeta, J., Rzaca-Urban, T., Wisniewski, J., Materna, T., Iskra, L. W., Smith, A. G., Ahmad, I., Blanc, A., Faust, H., Köster, U., Jentschel, M., Mutti, P., Soldner, T., Simpson, G. S., Pinston, J. A., France, G. de, Ur, C. A., Elomaa, Viki-Veikko, Eronen, Tommi, Hakala, Jani, Jokinen, Ari, Kankainen, Anu, Moore, Iain, Rissanen, Juho, Saastamoinen, Antti, Szerypo, Jerzy, Weber, Christine, and Äystö, Juha

Subjects
level densities, leveys, lifetimes, energy levels, isomer decays, nuclear structure and decayss
Abstract

Excited states in 98Y, populated in neutron-induced fission of 235U and in spontaneous fission of 248Cm and 252Cf, have been studied by means of γ spectroscopy using the Lohengrin fission-fragment separator at ILL Grenoble and the EXILL, Eurogam2, and Gammasphere Ge arrays. Two new isomers have been found in 98Y: a deformed one with T1/2 = 180(7) ns and a rotational band on top of it, and a spherical one with T1/2 = 0.45(15)μs, analogous to the 8+ isomer in 96Y, corresponding to the (νg7/2,πg9/2)8+ spherical configuration. Using the JYFLTRAP Penning trap, an accurate excitation energy of 465.7(7) keV has been determined for the 2.36-s isomer in 98Y. This result and the studies of excited levels in 98Zr, populated in β− decay of the isomer, indicate a new spin-parity, I π = (7)+ for the isomer. The high spin and the decay properties of this isomer suggest the presence of the 9/2+[404] neutron extruder orbital in its structure. This is consistent with the large deformation of the isomer, reported recently. The present work does not provide arguments to support the special role of the νg7/2 - πg9/2 interaction (the spin-orbit-partner, or SOP, mechanism). peerReviewed

Published
2017

168. Half-life of the 15/2$^+$ state of $^{135}$I : A test of E2 seniority relations

Author

Spagnoletti, P., Simpson, G.S., Carroll, R., Régis, M., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., De France, G., Ur, A., Urban, W., Bruce, A., Drouet, F., Fraile, M., Gaffney, P., Ghită, G., Ilieva, S., Jolie, J., Korten, W., Kröll, T., Larijarni, C., Lalkovski, S., Lică, R., Mach, H., Mărginean, N., Paziy, V., Podolyák, Zs., Regan, P., Scheck, M., Saed-Samii, N., Thiamova, G., Townsley, C., Vancraeyenest, A., Vedia, V., Gargano, A., Van Isacker, P., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Laue-Langevin (ILL), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, ILL, 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
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The half-life of the 15/2+1 state of the 3-valence-proton nucleus 135I has been measured to be 1.74(8) ns using the EXILL-FATIMA mixed array of Ge and LaBr3 detectors. The nuclei were produced following the cold neutron-induced fission of a 235U target at the PF1B beam line of the Institut Laue-Langevin. The extracted B(E2;15/2+→11/2+) value enabled a test of seniority relations for the first time between E2 transition rates. Large-scale shell-model calculations were performed for 134Te and 135I, and reinterpreted in a single-orbit approach. The results show that the two-body component of the E2 operator can be large whereas energy shifts due to the three-body component of the effective interaction are small.

Published
2017
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169. EXILL - a high-efficiency, high-resolution setup for gamma-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Back, T., and 0-Belirlenecek

Subjects
Instrumentation for neutron sources, Spectrometers, Gamma detectors (scintillators, CZT, HPG, HgI etc)
Abstract

WOS: 000414625700003, In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., U.S. DOE grant [DE-FG02-91ER40609]; NUPNET; German BMBF [O5P12PKNUF, 05P15RDFN1, 05P12RDNUP]; German DFG contract [KR 1796/2-1]; Polish National Science Centre [DEC-2013/09/B/ST2/03485], This work has been partly supported by the Polish National Science Centre under contract DEC-2013/09/B/ST2/03485, the U.S. DOE grant No. DE-FG02-91ER40609, the NUPNET and the German BMBF under contracts O5P12PKNUF, 05P15RDFN1 and 05P12RDNUP and the German DFG contract KR 1796/2-1.

Published
2017

170. Excited 0$^+$ states and deformed structures in the transitional nucleus $^{98}$Zr

Author

Mukhopadhyay, S., Biswas, D.C., Danu, L.S., Kumawat, A.K., Singh, Abhilasha, Blanc, A., De France, G., Jentschel, M., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C.A., Urban, W., Institut Laue-Langevin (ILL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Vernay, Emmanuelle, ILL, 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), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS)

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

International audience

Published
2016

171. Medium and High Spin Structure in the $^{94}$Y Isotope Produced in Fission Induced by Cold Neutrons

Author

Iskra, L.W., Fornal, B., Leoni, S., Bocchi, G., Jentschel, M., Köster, U., Mutti, P., Soldner, T., Blanc, A., De France, G., Régis, J.M., Simpson, G.S., Urban, W., Ur, C.A., Institut Laue-Langevin (ILL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ILL, 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)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), and Lion, Michel

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

International audience; The shape of a particular nucleus results from an interplay between the collective (macroscopic)and single-particle (microscopic) energies and, therefore, highly depends on both the atomicnumber Z and the neutron number N. The neutron-rich nuclei around Z=40 and N=60 provide oneof the best territories for the exploration of this sensitivity. Indeed, the sudden onset ofdeformation observed for neutron-rich nuclei with Z = 36–40 nuclei near N=60 is considered themost dramatic shape change in the nuclear chart. Nevertheless, the resent study of the yttriumisotopic chain reveal occurrence of shape coexistence in the 98Y isotope [1] and possible rotationalband above the 6- isomeric state in the 96Y nucleus [2]. This suggests that the evolution of thedeformation is a more gradual process. Therefore, we decided to investigate whether deformedstructures are still present in the 94Y nucleus which lies 5 neutrons away from the N=60 boundary.So far, very little spectroscopic information has been gathered on 94Y – what regards higher spinyrast excitations established was only the presence of the 1.35-μs, (5+) isomer at 1202 keVexcitation energy [3]. This isomer could be used as a starting point for the identification ofstructures on top of it.The 94Y isotope has been produced by fission of 235U target induced by cold neutron from thereactor at Institut Laue-Langevin. The level scheme up to excitation energies of about 7 MeV hasbeen established based on multi-fold gamma-ray coincidence relationships measured with theEXILL spectrometer [4] which consists of up to 46 HPGe detectors. During the analysis, over 30 newgamma transitions, which feed the previously known (5+) isomer, have been identified. Angularcorrelation analysis allows to define spin-parity assignment for most of the identified levels. Theidentified transitions don’t show any pattern characteristic for deformed structures. Furthermore,no higher located isomer has been found, similar to the ones known in heavier yttrium isotopes onwhich the rotational bands are built. Those findings are in line with the expectations that in 94Y onlyspherical structures are present at low excitation energy.[1] S. Brant, G. Lhersonneau, and K. Sistemich, Phys. Rev. C 69, 034327 (2004)[2] Ł. W. Iskra et al., to be published[3] J. Genevey et al., Phys. Rev. C 59, 82 (1999)[4] M. Jentschel et al., EXILL technical paper, JINST (subm. 2015)

Published
2016

172. Lifetimes of the 2$^+_1$ and the 4$^+_1$ States of $^{148}$Ce and its B$_{4/2}$ Ratio from EXILL&FATIMA Experiment

Author

Koseoglou, P., Werner, V., Pietralla, N., Ilieva, S., Bernards, C., Blanc, A., Bruce, A.M., Cakirli, R.B., Cooper, N., de France, G., Jentschel, M., Jolie, J., Koester, U., Kröll, T., Mutti, P., Patel, Z., Paziy, V., Podolyak, Zs., Regan, P.H., Regis, J.M., Roberts, O.J., Saed-Samii, N., Simpson, G.S., Soldner, T., Ur, C.A., Urban, W., Wilmsen, D., Wilson, E., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), Lion, Michel, 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 Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

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

International audience; The even-even N=90 isotones with Z=60-66, present an interesting phase transition. This phasetransition in nuclei is characterized by a sudden change of the shape of the nucleus [1]. 148Ce lies onthe downboundaries of the phase transition region and therefore further elucidate the underlyingmechanisms that lend the shape phase transition behavior. 235U and 241Pu fission fragments were measured by a mixed spectrometer consisting of highresolution Ge and fast LaBr3(Ce)-scintillator detectors at the high-flux reactor of the ILL. Prompt γ-ray cascades from the nuclei of interest are selected via Ge-Ge-LaBr3-LaBr3 coincidences. The goodenergy resolution of the Ge allows precise gates to be set, selecting the cascade, hence, the nucleusof interest. The excellent timing performance of the LaBr3 detectors in combination with theGeneral Centroid Difference method [2] allows the measurement of lifetimes in the ps range inpreparation for the FATIMA experiment at FAIR. The first results on neutron-rich 148Ce arepresented.

Published
2016

173. Low-spin structure of $^{86}_{35}$Br$_{51}$ and $^{86}_{36}$Kr$_{50}$ nuclei: The role of the g $_{7/2}$ neutron orbital

Author

Urban, W., Sieja, K., Materna, T., Czerwinski, M., Rzaca-Urban, T., Blanc, A., Jentschel, M., Mutti, P., Köster, U., Soldner, T., de France, G., Simpson, G. S., Ur, C., Bernards, C., Fransen, C., Jolie, J., Regis, J.-M., Thomas, T., Warr, N., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), 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), and 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)

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

International audience; Low-spin excited levels in Br513586 and Kr503686, populated following β− decay and the neutron-induced fission of U235, were measured using the Lohengrin fission-fragment separator and the EXILL array of Ge detectors at the PF1B cold-neutron facility of the Institute Laue-Langevin Grenoble. Improved populations of excited levels in Br86 remove inconsistencies existing in the literature on this nucleus. Directional-linear-polarization correlations, analyzed using newly developed formulas, as well as precise angular correlations allowed the unique 1− and 2− spin and parity assignments to the ground state of Br86 and the 4016.3-keV level in Kr86, respectively. Based on these results we propose that the Gamow-Teller β− decays of Se86 and Br86 involve the νg7/2→πg9/2 transition in addition to the νp3/2→πp3/2 transition proposed earlier. In Kr86 we have identified 1+1, 2+3, and 3+1 levels, analogous to the mixed-symmetry states in Mo94, which in Kr86 are from proton excitations, only. Large-scale, shell-model calculations with refined interactions reproduce well excitations in Br86 and Kr86 and support our interpretations.

Published
2016
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174. Multipolarity of the 2− → 1−, ground-state transition in $^{210}$Bi via multivariable angular correlation analysis

Author

Cieplicka-Oryńczak, N., Szpak, B., Leoni, S., Fornal, B., Bazzacco, D., Blanc, A., Bocchi, G., Bottoni, S., de France, G., Jentschel, M., Köster, U., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), EXILL, and 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)

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

International audience; The multipolarity of the main transition leading to the ground state in 210Bi was investigated using the angularcorrelations of γ rays. The analyzed γ -coincidence data were obtained from the 209Bi(n,γ )210Bi experimentperformed at Institut Laue-Langevin Grenoble at the PF1B cold-neutron facility. The EXILL (EXOGAM at theILL) multidetector array, consisting of 16 high-purity germanium detectors, was used to detect γ transitions. Themixing ratio of the 320-keV γ ray was defined by minimizing a multivariable χ2 function constructed from thecoefficients of angular correlation functions for seven pairs of strong transitions in 210Bi. As a result, the almostpure M1 multipolarity of the 320-keV γ ray was obtained, with an E2 admixture of less than 0.6% only (95%confidence limit). Based on this multipolarity the neutron-capture cross section leading to the ground state in210Bi, that decays in turn to radiotoxic 210Po, was determined to be within the limits 21.3(9) and 21.5(9) mb. Thisresult is important for nuclear reactor applications.

Published
2016
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175. Approaching complete low-spin spectroscopy of $^{210}$Bi with a cold-neutron capture reaction

Author

Cieplicka-Oryńczak, N., Fornal, B., Leoni, S., Bazzacco, D., Blanc, A., Bocchi, G., Bottoni, S., De France, G., Jentschel, M., Köster, U., Mutti, P., Simpson, G., Soldner, T., Szpak, B., Ur, C., Urban, W., Institut Laue-Langevin (ILL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), EXILL, ILL, 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
EXOGAM, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, EXILL
Abstract

The experiment was performed at the PF1B cold-neutron facility at the Institut Laue-Langevin in Grenoble (France); International audience; The low-spin structure of the 210Bi nucleus was investigated in the neutron capture experiment 209Bi(n,γ )210Biperformed at ILL Grenoble at the PF1B cold-neutron facility. By using the EXILL multidetector array, consistingof 46 high-purity germanium crystals, and γγ-coincidence technique, 64 primary γ rays were observed (40new) and a total number of 70 discrete states (33 new) were located below the neutron binding energy in 210Bi.The analysis of the angular correlations of γ rays provided information about transitions multipolarities, whichmade it possible to confirm most of the previously known spin-parity assignments and helped establish new ones.The obtained experimental results were compared to shell-model calculations involving one-valence-proton,one-valence-neutron excitations outside the 208Pb core. It has been found that while up to the energy of ∼2 MeVeach state observed in 210Bi has its calculated counterpart; at higher excitation energies some levels cannot bedescribed by the valence particle couplings. These states may arise from couplings of valence particles to the 3−octupole phonon of the doubly magic 208Pb core and may serve as a testing ground for models which describesingle particle-phonon excitations.

Published
2016
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176. EXOGAM at the ILL: the EXILL campaign

Author

de France, G., primary, Blanc, A., additional, Drouet, F., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Régis, J.M., additional, Simpson, G., additional, Soldner, T., additional, Stezowski, O., additional, Ur, C.A., additional, Urban, W., additional, and Vancrayenest, A., additional

Published
2018
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178. The Low-spin Structure of $^{206}$Tl Studied by $\gamma $-ray Spectroscopy from Thermal Neutron Capture Reaction

Author

Cieplicka-Oryńczak, N., primary, Michelagnoli, C., additional, Leoni, S., additional, Fornal, B., additional, Benzoni, G., additional, Blanc, A., additional, Bottoni, S., additional, Crespi, F.C.L., additional, Iskra, Ł.W., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Pietralla, N., additional, Ruiz-Martinez, E., additional, and Werner, V., additional

Published
2018
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179. Neutron-proton multiplets in the odd-odd nucleus $^{90}_{37}$Rb$_{53}$

Author

Czerwinski, M., Rzaca-Urban, T., Urban, W., Baczyk, P., Sieja, K., Timar, J., Nyako, B.M., Kuti, I., Tornyi, T. G., Atanasova, L., Blanc, A., Jentschel, M., Mutti, P., Koster, U., Soldner, T., de France, G., Simpson, G.S., Ur, C.A., 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), Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), EXILL, 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), and 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)

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

International audience; Medium-spin excited levels in 90Rb, populated in the fission of 235U induced by neutrons, have been observedfor the first time. γ radiation from fission has been measured by using the EXILL array of Ge detectors at thecold-neutron-beam facility PF1B of the Institut Laue–Langevin, Grenoble.

Published
2016
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180. Nuclear Spectroscopy for Nuclear Medicine ?

Author

Köster, U., Blanc, A., De France, G., Jentschel, M., Lee, Boon Quan, Leoni, S., Mutti, P., Regis, J.-M., Saed-Samii, N., Simpson, G., Soldner, T., Ur, C., Urban, W., Wilmsen, D., Collaboration, the EXILL, Institut Laue-Langevin (ILL), Division of Cancer Registration and Surveillance, National Cancer Center, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), 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), ILL, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-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), and Vernay, Emmanuelle

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

International audience

Published
2016

181. Fission fragment mass distribution in thermal neutron induced fission of $^{235}$U

Author

Singh, Abhilasha, Biswas, D.C., Mukhopadhyay, S., Danu, L.S., Blanc, A., De France, G., Jentschel, M., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C.A., Urban, W., Vernay, Emmanuelle, Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-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)-Centre National de la Recherche Scientifique (CNRS), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

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

International audience

Published
2016

182. Precise measurement of energies in Sn115 following the (n,γ) reaction

Author

Urban, W., Köster, U., Jentschel, M., Mutti, P., Märkisch, B., Rząca-Urban, T., Bernards, Ch., Fransen, Ch., Jolie, J., Thomas, T., Simpson, G.S., Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

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

International audience; The first measurement of γ rays from the Sn114(n,γ) reaction using cold neutrons, performed with an array of Ge detectors at the PF1B facility of the Institute Laue-Langevin in Grenoble, has provided the most accurate energy, Qβ=173(12) eV, of β− decay of the In115 ground state to the first excited state in Sn115. This is the lowest of all such energies in the known nuclear landscape. The accuracy of the neutron binding energy of Sn115 and the mass of Sn114 have been improved.

Published
2016
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183. Experimental study of the lifetime and phase transition in neutron-rich Zr98,100,102

Author

Ansari, S., primary, Régis, J.-M., additional, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Korten, W., additional, Zielińska, M., additional, Salsac, M.-D., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Mach, H., additional, Fraile, L. M., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Scheck, M., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Lalkovski, S., additional, Mărginean, N., additional, Otsuka, T., additional, Shimizu, N., additional, Togashi, T., additional, and Tsunoda, Y., additional

Published
2017
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184. Laue lens: the challenge of focusing gamma rays

Author

Roudil, G., primary, Courtois, P., primary, Rousselle, J., primary, Barrière, N., primary, von Ballmoos, P., primary, Natalucci, L., primary, Bastie, P., primary, Jentschel, M., primary, and Abrosimov, N. V., primary

Published
2017
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185. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., primary, Blanc, A., additional, de France, G., additional, Köster, U., additional, Leoni, S., additional, Mutti, P., additional, Simpson, G., additional, Soldner, T., additional, Ur, C., additional, Urban, W., additional, Ahmed, S., additional, Astier, A., additional, Augey, L., additional, Back, T., additional, Ba̧czyk, P., additional, Bajoga, A., additional, Balabanski, D., additional, Belgya, T., additional, Benzoni, G., additional, Bernards, C., additional, Biswas, D.C., additional, Bocchi, G., additional, Bottoni, S., additional, Britton, R., additional, Bruyneel, B., additional, Burnett, J., additional, Cakirli, R.B., additional, Carroll, R., additional, Catford, W., additional, Cederwall, B., additional, Celikovic, I., additional, Cieplicka-Oryńczak, N., additional, Clement, E., additional, Cooper, N., additional, Crespi, F., additional, Csatlos, M., additional, Curien, D., additional, Czerwiński, M., additional, Danu, L.S., additional, Davies, A., additional, Didierjean, F., additional, Drouet, F., additional, Duchêne, G., additional, Ducoin, C., additional, Eberhardt, K., additional, Erturk, S., additional, Fraile, L.M., additional, Gottardo, A., additional, Grente, L., additional, Grocutt, L., additional, Guerrero, C., additional, Guinet, D., additional, Hartig, A.-L., additional, Henrich, C., additional, Ignatov, A., additional, Ilieva, S., additional, Ivanova, D., additional, John, B.V., additional, John, R., additional, Jolie, J., additional, Kisyov, S., additional, Krticka, M., additional, Konstantinopoulos, T., additional, Korgul, A., additional, Krasznahorkay, A., additional, Kröll, T., additional, Kurpeta, J., additional, Kuti, I., additional, Lalkovski, S., additional, Larijani, C., additional, Leguillon, R., additional, Lica, R., additional, Litaize, O., additional, Lozeva, R., additional, Magron, C., additional, Mancuso, C., additional, Martinez, E. Ruiz, additional, Massarczyk, R., additional, Mazzocchi, C., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Mokry, C., additional, Mukhopadhyay, S., additional, Mulholland, K., additional, Nannini, A., additional, Napoli, D.R., additional, Olaizola, B., additional, Orlandi, R., additional, Patel, Z., additional, Paziy, V., additional, Petrache, C., additional, Pfeiffer, M., additional, Pietralla, N., additional, Podolyak, Z., additional, Ramdhane, M., additional, Redon, N., additional, Regan, P., additional, Regis, J.M., additional, Regnier, D., additional, Oliver, R. J., additional, Rudigier, M., additional, Runke, J., additional, Rza̧ca-Urban, T., additional, Saed-Samii, N., additional, Salsac, M.D., additional, Scheck, M., additional, Schwengner, R., additional, Sengele, L., additional, Singh, P., additional, Smith, J., additional, Stezowski, O., additional, Szpak, B., additional, Thomas, T., additional, Thürauf, M., additional, Timar, J., additional, Tom, A., additional, Tomandl, I., additional, Tornyi, T., additional, Townsley, C., additional, Tuerler, A., additional, Valenta, S., additional, Vancraeyenest, A., additional, Vandone, V., additional, Vanhoy, J., additional, Vedia, V., additional, Warr, N., additional, Werner, V., additional, Wilmsen, D., additional, Wilson, E., additional, Zerrouki, T., additional, and Zielinska, M., additional

Published
2017
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186. Shape coexistence in the odd-odd nucleus Y98 : The role of the g9/2 neutron extruder

Author

Urban, W., primary, Czerwiński, M., additional, Kurpeta, J., additional, Rząca-Urban, T., additional, Wiśniewski, J., additional, Materna, T., additional, Iskra, Ł. W., additional, Smith, A. G., additional, Ahmad, I., additional, Blanc, A., additional, Faust, H., additional, Köster, U., additional, Jentschel, M., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Pinston, J. A., additional, de France, G., additional, Ur, C. A., additional, Elomaa, V.-V., additional, Eronen, T., additional, Hakala, J., additional, Jokinen, A., additional, Kankainen, A., additional, Moore, I. D., additional, Rissanen, J., additional, Saastamoinen, A., additional, Szerypo, J., additional, Weber, C., additional, and Äystö, J., additional

Published
2017
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187. Medium and high spin structure in the94Y isotope produced in fission induced by cold neutrons

Author

Iskra, Ł W, primary, Fornal, B, additional, Leoni, S, additional, Bocchi, G, additional, Blanc, A, additional, Bottoni, S, additional, Cieplicka-Oryńczak, N, additional, Jentschel, M, additional, Köster, U, additional, Michelagnoli, C, additional, Mutti, P, additional, Soldner, T, additional, de France, G, additional, Simpson, G S, additional, Ur, C A, additional, and Urban, W, additional

Published
2017
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188. Erratum: Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing [Phys. Rev. C 95 , 054319 (2017)]

Author

Régis, J.-M., primary, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Pfeiffer, M., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Fraile, L. M., additional, Mach, H., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Scheck, M., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Lalkovski, S., additional, Korten, W., additional, Mărginean, N., additional, Otsuka, T., additional, Shimizu, N., additional, Togashi, T., additional, and Tsunoda, Y., additional

Published
2017
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191. Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing

Author

Régis, J.-M., primary, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Pfeiffer, M., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Fraile, L. M., additional, Mach, H., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Scheck, M., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Lalkovski, S., additional, Korten, W., additional, Mărginean, N., additional, Otsuka, T., additional, Shimizu, N., additional, Togashi, T., additional, and Tsunoda, Y., additional

Published
2017
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192. Identification of excited states and collectivity in Se88

Author

Gratchev, I. N., primary, Simpson, G. S., additional, Thiamova, G., additional, Ramdhane, M., additional, Sieja, K., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, de France, G., additional, Ur, C. A., additional, and Urban, W., additional

Published
2017
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194. Neutron-proton multiplets in the nucleus $^{88}$Br

Author

Czerwinski, M., Rzaca-Urban, T., Urban, W., Baczyk, P., Sieja, K., Nyako, B.M., Timar, J., Kuti, I., Tornyi, T.G., Atanasova, L., Blanc, A., Jentschel, M., Mutti, P., Koster, U., Soldner, T., De France, G., Simpson, G.S., Ur, C.A., 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), Institut Laue-Langevin (ILL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-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), ILL, 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), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
23.20.Lv, 23.20.Gq, 25.85.−w, 27.50.+e, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
Full Text
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195. Near-yrast excitations in nucleus 83As: tracing the deformation in the $^{78}$Ni region

Author

Bączyk, P., Urban, W., Zlotowska, D., Czerwiński, M., Rzaca-Urban, T., Konieczka, M., Blanc, A., Jentschel, M., Mutti, P., Köster, U., Soldner, T., de France, G., Simpson, G., Ur, C., Institut Laue-Langevin (ILL), 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 EXILL

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

International audience; Medium-spin, yrast excitations in nucleus 83As have been studied in neutron-induced fission of 235U. The experiment took place at the InstitutLaue-Langevin in Grenoble where gamma rays were registered using the EXILL detector array. Recently, we proposed new tentative (9=2+) spinassignment for 2777 keV level in 83As, which is now discussed in the context of deformation showing up in 78Ni region.

Published
2015
Full Text
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196. Nuclear structure of $^{69}$Zn from (n,γ) reaction studied with EXILL

Author

Bączyk, P., Czerwiński, M., Korgul, A., Mazzocchi, C., Rząca-Urban, T., Urban, W., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., De France, G., Simpson, G., Ur, C.A., Institut Laue-Langevin (ILL), 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), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Istituto Nazionale di Fisica Nucleare (INFN), ILL, 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
Full Text
View/download PDF

197. Near-yrast excitations in nucleus $^{83}$As: Tracing the π g9/2 orbital in the $^{78}$Ni region

Author

Bączyk, P., Urban, W., Złotowska, D., Czerwiński, M., Rząca-Urban, T., Blanc, A., Jentschel, M., Mutti, P., Köster, U., Soldner, T., De France, G., Simpson, G., Ur, C. A., Institut Laue-Langevin (ILL), 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), ILL, 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
23.20.En, 23.20.Lv, 25.85.Ec, 27.50.+e, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The nucleus 83As, populated in the neutron-induced fission of 235U was studied via prompt γ -ray spectroscopyusing the EXILL Ge array at the cold-neutron beam PF1B of ILL Grenoble. The level scheme is reviewed. The2779.0-keV level is tentatively assigned spin (9/2+) as the πg9/2 excitation, based on systematics and availableshell-model calculations.

Published
2015
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198. Lifetime measurement in neutron-rich A~100 nuclei.

Author

Köster, U., Ansari, S., Régis, J-M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., Zielińska, M., Salsac, M.-D., Blanc, A., Jentschel, M., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., de France, G., Clément, E., Stezowski, O., and Ur, C.A.

Subjects
EXCITED states, ZIRCONIUM, CENTROID, DEFORMATIONS (Mechanics), MONTE Carlo method
Abstract

Lifetimes of excited states of the 98;100;102Zr nuclei were measured by using the Generalized Centroid Difference Method. The nuclei of interest were populated via neutron-induced fission of 241Pu and 235U during the EXILL-FATIMA campaign. The obtained lifetimes were used to calculate the B(E2) transition strengths and β deformation parameters which were then compared with the recent theoretical predictions obtained with Monte Carlo Shell Model. [ABSTRACT FROM AUTHOR]

Published
2018

199. Excited States and Collectivity in 88Se.

Author

Köster, U., Simpson, G., Grachev, I., Thiamova, G., Ramdhane, M., Sieja, K., Blanc, A., Jentschel, M., Mutti, P., Soldner, T., de France, G., Ur, C.A., and Urban, W.

Subjects
COLD neutrons, EXCITED states, QUADRUPOLES, NUCLEAR shell theory, RADIOACTIVE decay
Abstract

The γ decays of excited states in the very neutron-rich nucleus 88Se have been observed following the cold neutron-induced fission of 235U at the PF1B facility of the Institut Laue-Langevin (ILL), Grenoble. The EXILL array was used to measure γ - γ - γ coincidences, which were then analysed to build a level scheme of 88Se. A low (2+1) energy hints at the onset of quadrupole deformation and the identification of possible members of a (2+2) band provide evidence for γ vibrations. Shell-model calculations using a 78Ni core reproduce the experimental decay scheme well, implying that interactions between particles in the π f5/2p and vsd orbits are responsible for much of the collectivity present. The algebraic collective model has also been used to interpret the experimental data, showing that that the experimental spectrum is consistent with 88Se being a transitional nucleus, possessing weak static β deformation and γ instability. [ABSTRACT FROM AUTHOR]

Published
2018

200. (n,γ) reactions on rare Ca isotopes: Valence-hole - coreexcitation couplings in 47Ca.

Author

Köster, U., Bottoni, S., Cieplicka-Oryńczak, N., Bocchi, G., Leoni, S., Fornal, B., Colò, G., Bortignon, P.F., Benzoni, G., Blanc, A., Bracco, A., Crespi, F.C.L., Jentschel, M., Michelagnoli, C., Million, B., Mutti, P., Soldner, T., Türler, A., Ur, C.A., and Urban, W.

Subjects
NUCLEAR reactions, CALCIUM isotopes, NUCLEAR excitation, VALENCE (Chemistry), COLD neutrons, NUCLEAR reactors
Abstract

Recent results on the structure of 47Ca will be presented. The nucleus of interest was populated via the cold-neutron capture 46Ca(n,γ) reaction, on a rare 46Ca target, during the EXILL experimental campaign at the nuclear reactor of Institut Laue- Langevin in Grenoble. High-resolution γ-ray spectroscopy, performed with a composite array of HPGe detectors, enabled the identification of new transitions deexciting states between the neutron-capture level and the ground state. Experimental data will be compared with a novel microscopic theoretical model, currently under development, specifically designed to describe the low-lying structure of odd-mass nuclei with one valence particle/hole outside a spherical doubly-magic core, using the Skyrme effective interaction self-consistently. [ABSTRACT FROM AUTHOR]

Published
2018

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