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Article ; Online: Low Density In-Medium Effects on Light Clusters from Heavy-Ion Data.

Pais, Helena / Bougault, Rémi / Gulminelli, Francesca / Providência, Constança / Bonnet, Eric / Borderie, Bernard / Chbihi, Abdelouahad / Frankland, John D / Galichet, Emmanuelle / Gruyer, Diégo / Henri, Maxime / Le Neindre, Nicolas / Lopez, Olivier / Manduci, Loredana / Parlôg, Marian / Verde, Giuseppe

Physical review letters

2020 Volume 125, Issue 1, Page(s) 12701

Abstract: The modification of the ground state properties of light atomic nuclei in the nuclear and stellar medium is addressed, using chemical equilibrium constants evaluated from a new analysis of the intermediate energy heavy-ion (Xe+Sn) collision data measured ...

Abstract	The modification of the ground state properties of light atomic nuclei in the nuclear and stellar medium is addressed, using chemical equilibrium constants evaluated from a new analysis of the intermediate energy heavy-ion (Xe+Sn) collision data measured by the INDRA Collaboration. Three different reactions are considered, mainly differing by the isotopic content of the emission source. The thermodynamic conditions of the data samples are extracted from the measured multiplicities allowing for a parametrization of the in-medium modification, determined with the single hypothesis that the different nuclear species in a given sample correspond to a unique common value for the density of the expanding source. We show that this correction, which was not considered in previous analyses of chemical constants from heavy-ion collisions, is necessary, since the observables of the analyzed systems show strong deviations from the expected results for an ideal gas of free clusters. This dataset is further compared to a relativistic mean-field model, and seen to be reasonably compatible with a universal correction of the attractive σ-meson coupling.
Language	English
Publishing date	2020-07-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.012701
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Conference proceedings ; Online: Micromagnetic NDE techniques for the characterization of precipitation-induced embrittlement of 15 NiCuMoNb 5 (WB 36) steel

Altpeter, I. / Dobmann, G. / Parlog, M. / Szielasko, K.

2003

Abstract: S.465-471 ... The low-alloy, heat-resistant steel 15 NiCuMoNb 5 (WB 36, material number 1.6368) is used as piping and vessel material in boiling water reactor (BWR) and pressurized water reactor (PWR) nuclear power plants in Germany. After long-term ... ...

Abstract	S.465-471 The low-alloy, heat-resistant steel 15 NiCuMoNb 5 (WB 36, material number 1.6368) is used as piping and vessel material in boiling water reactor (BWR) and pressurized water reactor (PWR) nuclear power plants in Germany. After long-term service exposure at temperatures above 320 °C, damage was observed during operation (and in one case during in-service hydro-testing). Preliminary investigations concluded that the service-induced hardening and decrease in toughness in WB 36 materials was caused by the precipitation of copper. For the non-destructive characterization of the precipitation-induced embrittlement of WB 36, service exposure was simulated on a set of tensile test samples. The material was observed to exhibit a peak-hardness of about 240 HV10 after about 1000 hours of service-exposure at 400°C. This is an increase of 40 HV10 with reference to the initial hardness of 200 HV10. As conventional hardness measurements are not applicable in this case, early-detecting the hardness increase non-destructively could enable the provider to stop any further service exposure of the material in time. Therefore, the suitability of micromagnetic NDE techniques for the non-destructive characterization of the Vickers hardness was investigated. A measurement system was successfully calibrated for the prediction of HV10 by Barkhausen noise and field upper harmonics analysis. The practical applicability of this approach was shown by proving its independence on side-effects like plastic deformation and superimposed tensile loads. In all cases, high correlation (0.90 < r² < 0.99) and low deviation (10 HV10 < error bandwidth < 5 HV10) between prediction and aim were achieved. Dynamic magnetostriction measurements and eddy current impedance analyses were found to offer additional possibilities for the non-destructive detection of the hardness changes, as both of them reflect changes in the material's conductivity and permeability.
Keywords	micromagnetic technique ; heat resistant steel ; nondestructive evaluation ; embrittlement ; 620 ; 658 ; 670
Subject code	621
Language	English
Publishing country	de
Document type	Conference proceedings ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Observation of a correlated free four-neutron system.

Duer, M / Aumann, T / Gernhäuser, R / Panin, V / Paschalis, S / Rossi, D M / Achouri, N L / Ahn, D / Baba, H / Bertulani, C A / Böhmer, M / Boretzky, K / Caesar, C / Chiga, N / Corsi, A / Cortina-Gil, D / Douma, C A / Dufter, F / Elekes, Z /

Feng, J / Fernández-Domínguez, B / Forsberg, U / Fukuda, N / Gasparic, I / Ge, Z / Gheller, J M / Gibelin, J / Gillibert, A / Hahn, K I / Halász, Z / Harakeh, M N / Hirayama, A / Holl, M / Inabe, N / Isobe, T / Kahlbow, J / Kalantar-Nayestanaki, N / Kim, D / Kim, S / Kobayashi, T / Kondo, Y / Körper, D / Koseoglou, P / Kubota, Y / Kuti, I / Li, P J / Lehr, C / Lindberg, S / Liu, Y / Marqués, F M / Masuoka, S / Matsumoto, M / Mayer, J / Miki, K / Monteagudo, B / Nakamura, T / Nilsson, T / Obertelli, A / Orr, N A / Otsu, H / Park, S Y / Parlog, M / Potlog, P M / Reichert, S / Revel, A / Saito, A T / Sasano, M / Scheit, H / Schindler, F / Shimoura, S / Simon, H / Stuhl, L / Suzuki, H / Symochko, D / Takeda, H / Tanaka, J / Togano, Y / Tomai, T / Törnqvist, H T / Tscheuschner, J / Uesaka, T / Wagner, V / Yamada, H / Yang, B / Yang, L / Yang, Z H / Yasuda, M / Yoneda, K / Zanetti, L / Zenihiro, J / Zhukov, M V

Nature

2022 Volume 606, Issue 7915, Page(s) 678–682

Abstract: A long-standing question in nuclear physics is whether chargeless nuclear systems can exist. To our knowledge, only neutron stars represent near-pure neutron systems, where neutrons are squeezed together by the gravitational force to very high densities. ...

Abstract	A long-standing question in nuclear physics is whether chargeless nuclear systems can exist. To our knowledge, only neutron stars represent near-pure neutron systems, where neutrons are squeezed together by the gravitational force to very high densities. The experimental search for isolated multi-neutron systems has been an ongoing quest for several decades
Language	English
Publishing date	2022-06-22
Publishing country	England
Document type	Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
ZDB-ID	120714-3
ISSN	1476-4687 ; 0028-0836
ISSN (online)	1476-4687
ISSN	0028-0836
DOI	10.1038/s41586-022-04827-6
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Long lifetime components in the decay of excited super-heavy nuclei

Morjean M. / Chbihi A. / Dasgupta M. / Drouart A. / Frankland J.D. / Frégeau J.D. / Hinde D.J. / Jacquet D. / Nalpas L. / Pârlog M. / Simenel C. / Tassan-Got L. / Williams E.

EPJ Web of Conferences, Vol 63, p

2013 Volume 02011

Abstract: For nuclear reactions in which super-heavy nuclei can be formed, the essential difference between the fusion process followed by fission and non-equilibrium processes leading to fission-like fragments is there action time. Quite probable non-equilibrium ... ...

Abstract	For nuclear reactions in which super-heavy nuclei can be formed, the essential difference between the fusion process followed by fission and non-equilibrium processes leading to fission-like fragments is there action time. Quite probable non-equilibrium processes, characterized by very short reaction times, are highlighted thanks to mass-angle correlations. However, long lifetime components associated with fission following fusion have been observed with two independent experimental techniques, providing evidence for the formation of compound nuclei with Z = 120 and 124, followed by mass asymmetric fission.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Language	English
Publishing date	2013-12-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Study of nuclear stopping in central collisions at intermediate energies.

Lehaut, G / Durand, D / Lopez, O / Vient, E / Chbihi, A / Frankland, J D / Bonnet, E / Borderie, B / Bougault, R / Galichet, E / Guinet, D / Lautesse, Ph / Le Neindre, N / Napolitani, P / Parlog, M / Rivet, M F / Rosato, E

Physical review letters

2010 Volume 104, Issue 23, Page(s) 232701

Abstract: Nuclear stopping has been investigated in central nuclear collisions at intermediate energies by analyzing kinematically complete events recorded with the help of the 4π multidetector INDRA for a large variety of symmetric systems. It is found that the ... ...

Abstract	Nuclear stopping has been investigated in central nuclear collisions at intermediate energies by analyzing kinematically complete events recorded with the help of the 4π multidetector INDRA for a large variety of symmetric systems. It is found that the mean isotropy ratio defined as the ratio of transverse to parallel momenta (energies) reaches a minimum near the Fermi energy, saturates or slowly increases depending on the mass of the system as the beam energy increases, and then stays lower than unity, showing that significant stopping is not achieved even for the heavier systems. Close to and above the Fermi energy, experimental data show no effect of the isospin content of the interacting system. A comparison with transport model calculations reveals that the latter overestimates the stopping power at low energies.
Language	English
Publishing date	2010-06-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.104.232701
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Article ; Online: X-ray fluorescence from the element with atomic number Z=120.

Frégeau, M O / Jacquet, D / Morjean, M / Bonnet, E / Chbihi, A / Frankland, J D / Rivet, M F / Tassan-Got, L / Dechery, F / Drouart, A / Nalpas, L / Ledoux, X / Parlog, M / Ciortea, C / Dumitriu, D / Fluerasu, D / Gugiu, M / Gramegna, F / Kravchuk, V L /

Marchi, T / Fabris, D / Corsi, A / Barlini, S

Physical review letters

2012 Volume 108, Issue 12, Page(s) 122701

Abstract: An atomic clock based on x-ray fluorescence yields has been used to estimate the mean characteristic time for fusion followed by fission in reactions 238U + 64Ni at 6.6 MeV/A. Inner shell vacancies are created during the collisions in the electronic ... ...

Abstract	An atomic clock based on x-ray fluorescence yields has been used to estimate the mean characteristic time for fusion followed by fission in reactions 238U + 64Ni at 6.6 MeV/A. Inner shell vacancies are created during the collisions in the electronic structure of the possibly formed Z=120 compound nuclei. The filling of these vacancies accompanied by a x-ray emission with energies characteristic of Z=120 can take place only if the atomic transitions occur before nuclear fission. Therefore, the x-ray yield characteristic of the united atom with 120 protons is strongly related to the fission time and to the vacancy lifetimes. K x rays from the element with Z=120 have been unambiguously identified from a coupled analysis of the involved nuclear reaction mechanisms and of the measured photon spectra. A minimum mean fission time τ(f)=2.5×10(-18) s has been deduced for Z=120 from the measured x-ray multiplicity.
Language	English
Publishing date	2012-03-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.108.122701
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Recent results from INDRA

Chbihi A. / Frankland J.D. / Lopez O. / Boisjoli M. / Bonnet E. / Gruyer D. / Marini P. / Ademard G. / Rivet M.-F. / Verde G. / Bougault R. / Borderie B. / Galichet E. / La Commara M. / Le Neindre N. / Legouée E. / Lombardo I. / Manduci L. / Pârlog M. /

Rosato E. / Roy R. / Spadaccini G. / Vient E. / Vigilante M. / Wieleczko J.P.

EPJ Web of Conferences, Vol 88, p

2015 Volume 00005

Abstract: Recent results of the INDRA collaboration are presented in this contribution. They concern the evolution of reaction dynamics from the first stage of the collision to the production of fragments. Different probes are used to evidence the stopping/ ... ...

Abstract	Recent results of the INDRA collaboration are presented in this contribution. They concern the evolution of reaction dynamics from the first stage of the collision to the production of fragments. Different probes are used to evidence the stopping/transparency, collective flow and the symmetry energy term of the nuclear equation of state.
Keywords	Science ; Q ; Physics ; QC1-999
Language	English
Publishing date	2015-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: New scalings in nuclear fragmentation.

Bonnet, E / Borderie, B / Le Neindre, N / Raduta, Ad R / Rivet, M F / Bougault, R / Chbihi, A / Frankland, J D / Galichet, E / Gagnon-Moisan, F / Guinet, D / Lautesse, P / Łukasik, J / Marini, P / Pârlog, M / Rosato, E / Roy, R / Spadaccini, G / Vigilante, M /

Wieleczko, J P / Zwieglinski, B

Physical review letters

2010 Volume 105, Issue 14, Page(s) 142701

Abstract: Fragment partitions of fragmenting hot nuclei produced in central and semiperipheral collisions have been compared in the excitation energy region 4-10 MeV per nucleon where radial collective expansion takes place. It is shown that, for a given total ... ...

Abstract	Fragment partitions of fragmenting hot nuclei produced in central and semiperipheral collisions have been compared in the excitation energy region 4-10 MeV per nucleon where radial collective expansion takes place. It is shown that, for a given total excitation energy per nucleon, the amount of radial collective energy fixes the mean fragment multiplicity. It is also shown that, at a given total excitation energy per nucleon, the different properties of fragment partitions are completely determined by the reduced fragment multiplicity (i.e., normalized to the source size). Freeze-out volumes seem to play a role in the scalings observed.
Language	English
Publishing date	2010-10-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.105.142701
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Article: Bimodal behavior of the heaviest fragment distribution in projectile fragmentation.

Bonnet, E / Mercier, D / Borderie, B / Gulminelli, F / Rivet, M F / Tamain, B / Bougault, R / Chbihi, A / Dayras, R / Frankland, J D / Galichet, E / Gagnon-Moisan, F / Guinet, D / Lautesse, P / Lukasik, J / Le Neindre, N / Pârlog, M / Rosato, E / Roy, R /

Vigilante, M / Wieleczko, J P / Zwieglinski, B

Physical review letters

2009 Volume 103, Issue 7, Page(s) 72701

Abstract: The charge distribution of the heaviest fragment detected in the decay of quasiprojectiles produced in intermediate energy heavy-ion collisions has been observed to be bimodal. This feature is expected as a generic signal of phase transition in ... ...

Abstract	The charge distribution of the heaviest fragment detected in the decay of quasiprojectiles produced in intermediate energy heavy-ion collisions has been observed to be bimodal. This feature is expected as a generic signal of phase transition in nonextensive systems. In this Letter, we present new analyses of experimental data from Au on Au collisions at 60, 80, and 100 MeV/nucleon showing that bimodality is largely independent of the data selection procedure and of entrance channel effects. An estimate of the latent heat of the transition is extracted.
Language	English
Publishing date	2009-08-14
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.103.072701
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Fission time measurements: a new probe into superheavy element stability.

Morjean, M / Jacquet, D / Charvet, J L / L'Hoir, A / Laget, M / Parlog, M / Chbihi, A / Chevallier, M / Cohen, C / Dauvergne, D / Dayras, R / Drouart, A / Escano-Rodriguez, C / Frankland, J D / Kirsch, R / Lautesse, P / Nalpas, L / Ray, C / Schmitt, C /

Stodel, C / Tassan-Got, L / Testa, E / Volant, C

Physical review letters

2008 Volume 101, Issue 7, Page(s) 72701

Abstract: Reaction mechanism analyses performed with a 4pi detector for the systems 208Pb + Ge, 238U + Ni and 238U + Ge, combined with analyses of the associated reaction time distributions, provide us with evidence for nuclei with Z=120 and 124 living longer than ...

Abstract	Reaction mechanism analyses performed with a 4pi detector for the systems 208Pb + Ge, 238U + Ni and 238U + Ge, combined with analyses of the associated reaction time distributions, provide us with evidence for nuclei with Z=120 and 124 living longer than 10(-18) s and arising from highly excited compound nuclei. By contrast, the neutron deficient nuclei with Z=114 possibly formed in 208Pb + Ge reactions have shorter lifetimes, close to or below the sensitivity limit of the experiment.
Language	English
Publishing date	2008-08-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.101.072701
Database	MEDical Literature Analysis and Retrieval System OnLINE

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