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Borderie B, Raduta AR, Ademard G, Rivet MF, De Filippo E, Geraci E, Le Neindre N, Cardella G, Lanzalone G, Lombardo I, Lopez O, Maiolino C, Pagano A, Pirrone S, Politi G, Rizzo F, Russotto P. Alpha-particle clustering in excited expanding self-conjugate nuclei. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611707014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gruyer D, Frankland JD, Botet R, Płoszajczak M, Bonnet E, Chbihi A, Ademard G, Boisjoli M, Borderie B, Bougault R, Guinet D, Lautesse P, Manduci L, Le Neindre N, Marini P, Pawłowski P, Rivet MF, Rosato E, Spadaccini G, Vigilante M, Wieleczko JP. Nuclear multifragmentation time scale and fluctuations of the largest fragment size. Phys Rev Lett 2013; 110:172701. [PMID: 23679716 DOI: 10.1103/physrevlett.110.172701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 02/26/2013] [Indexed: 06/02/2023]
Abstract
Distributions of the largest fragment charge, Zmax, in multifragmentation reactions around the Fermi energy can be decomposed into a sum of a Gaussian and a Gumbel distribution, whereas at much higher or lower energies one or the other distribution is asymptotically dominant. We demonstrate the same generic behavior for the largest cluster size in critical aggregation models for small systems, in or out of equilibrium, around the critical point. By analogy with the time-dependent irreversible aggregation model, we infer that Zmax distributions are characteristic of the multifragmentation time scale, which is largely determined by the onset of radial expansion in this energy range.
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Affiliation(s)
- D Gruyer
- GANIL, CEA-DSM/CNRS-IN2P3, Boulevard Henri Becquerel, F-14076 Caen Cedex, France
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Frégeau MO, Jacquet D, Morjean M, Bonnet E, Chbihi A, Frankland JD, Rivet MF, Tassan-Got L, Dechery F, Drouart A, Nalpas L, Ledoux X, Parlog M, Ciortea C, Dumitriu D, Fluerasu D, Gugiu M, Gramegna F, Kravchuk VL, Marchi T, Fabris D, Corsi A, Barlini S. X-ray fluorescence from the element with atomic number Z=120. Phys Rev Lett 2012; 108:122701. [PMID: 22540578 DOI: 10.1103/physrevlett.108.122701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Indexed: 05/31/2023]
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.
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Affiliation(s)
- M O Frégeau
- GANIL, CEA-DSM and IN2P3-CNRS, B.P. 55027, F-14076 Caen Cedex, France
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Raduta AR, Borderie B, Geraci E, Le Neindre N, Napolitani P, Rivet MF. Direct evidence of α-particle condensation for the Hoyle state. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123100034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bonnet E, Borderie B, Le Neindre N, Raduta AR, Rivet MF, Bougault R, Chbihi A, Frankland JD, Galichet E, Gagnon-Moisan F, Guinet D, Lautesse P, Łukasik J, Marini P, Pârlog M, Rosato E, Roy R, Spadaccini G, Vigilante M, Wieleczko JP, Zwieglinski B. New scalings in nuclear fragmentation. Phys Rev Lett 2010; 105:142701. [PMID: 21230826 DOI: 10.1103/physrevlett.105.142701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Indexed: 05/30/2023]
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.
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Affiliation(s)
- E Bonnet
- GANIL (DSM-CEA/CNRS/IN2P3), F-14076 Caen cedex, France
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Lehaut G, Durand D, Lopez O, Vient E, Chbihi A, Frankland JD, Bonnet E, Borderie B, Bougault R, Galichet E, Guinet D, Lautesse P, Le Neindre N, Napolitani P, Parlog M, Rivet MF, Rosato E. Study of nuclear stopping in central collisions at intermediate energies. Phys Rev Lett 2010; 104:232701. [PMID: 20867230 DOI: 10.1103/physrevlett.104.232701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Indexed: 05/29/2023]
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.
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Affiliation(s)
- G Lehaut
- LPC, CNRS/IN2P3, Ensicaen, Université de Caen Basse Normandie, F-14050 Caen cedex, France
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Bonnet E, Mercier D, Borderie B, Gulminelli F, Rivet MF, Tamain B, Bougault R, Chbihi A, Dayras R, Frankland JD, Galichet E, Gagnon-Moisan F, Guinet D, Lautesse P, Lukasik J, Le Neindre N, Pârlog M, Rosato E, Roy R, Vigilante M, Wieleczko JP, Zwieglinski B. Bimodal behavior of the heaviest fragment distribution in projectile fragmentation. Phys Rev Lett 2009; 103:072701. [PMID: 19792638 DOI: 10.1103/physrevlett.103.072701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2008] [Indexed: 05/28/2023]
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.
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Affiliation(s)
- E Bonnet
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud 11, F-91406 Orsay cedex, France
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Borderie B, Tăbăcaru G, Chomaz P, Colonna M, Guarnera A, Pârlog M, Rivet MF, Auger G, Bacri CO, Bellaize N, Bougault R, Bouriquet B, Brou R, Buchet P, Chbihi A, Colin J, Demeyer A, Galichet E, Gerlic E, Guinet D, Hudan S, Lautesse P, Lavaud F, Laville JL, Lecolley JF, Leduc C, Legrain R, Le Neindre N, Lopez O, Louvel M, Maskay AM, Normand J, Pawlowski P, Rosato E, Saint-Laurent F, Steckmeyer JC, Tamain B, Tassan-Got L, Vient E, Wieleczko JP. Evidence for spinodal decomposition in nuclear multifragmentation. Phys Rev Lett 2001; 86:3252-3255. [PMID: 11327943 DOI: 10.1103/physrevlett.86.3252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2000] [Indexed: 05/23/2023]
Abstract
Multifragmentation of a "fused system" was observed for central collisions between 32 MeV/nucleon 129Xe and (nat)Sn. Most of the resulting charged products were well identified due to the high performances of the INDRA 4pi array. Experimental higher-order charge correlations for fragments show a weak but nonambiguous enhancement of events with nearly equal-sized fragments. Supported by dynamical calculations in which spinodal decomposition is simulated, this observed enhancement is interpreted as a "fossil" signal of spinodal instabilities in finite nuclear systems.
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Affiliation(s)
- B Borderie
- Institut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, France
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Rivet MF, Borderie B, Gauvin H, Gardès D, Cabot C, Hanappe F, Peter J. Deexcitation of nuclei formed near the instability temperature. Phys Rev C Nucl Phys 1986; 34:1282-1293. [PMID: 9953585 DOI: 10.1103/physrevc.34.1282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bimbot R, Della-Negra S, Gardès D, Rivet MF, Fleurier C, Dumax B, Hoffman DHH, Weyrich K, Deutsch C, Maynard G. SPQR II: A beam-plasma interaction experiment. ACTA ACUST UNITED AC 1986. [DOI: 10.1063/1.36297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Jacquet D, Galin J, Borderie B, Gardes D, Guerreau D, Lefort M, Monnet F, Rivet MF, Tarrago X, Duek E, Alexander JM. Approach to the limits for massive energy and spin deposition into a composite nucleus. Phys Rev C Nucl Phys 1985; 32:1594-1604. [PMID: 9953015 DOI: 10.1103/physrevc.32.1594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Berlanger M, Gobbi A, Hanappe F, Lynen U, Ng� C, Olmi A, Sann H, Stelzer H, Richel H, Rivet MF. Study of a fast collective mode in deep inelastic reactions: Quantal fluctuations. ACTA ACUST UNITED AC 1979. [DOI: 10.1007/bf01437993] [Citation(s) in RCA: 72] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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