Fusion and deep inelastic collisions studied on the Ar + Au system

Galin, J.; Gatty, B.; Guerreau, D.; Lefórt, M.; Tarrago, X.; Agarwal, S.; Babinet, R.; Cauvin, B.; Girard, J.; Nifenecker, H.

doi:10.1007/bf01418709

Cited by 19 publications

(4 citation statements)

References 20 publications

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“…A question of great importance for these studies and for those of [40], is the means used to identify "symmetric fragmentation" reactions. For 201-248MeV *~ a clear separation was observed between projectile-like and the more massive symmetric fragments, and thus there is essentially no ambiguity for mass selection [8,9]. However, the width of the mass distributions for both groups in- The full curve was calculated by the theory of Swiatecki [17] with unmodified barrier from the proximity potential.…”

Section: B the "Extra-push" Theory And Its Parametrizationmentioning

confidence: 99%

“…810mb at E~ab=248 MeV). Galin et al measured energy and angular distributions for products with Z<~52 in 217 MeV 4~ they also speak of a separation between fission after complete fusion and deeply inelastic collisions [9]. For the "fusion-fission" a most probable Z of 46_+ t was reported in contrast to 48.5 which corresponds to one half the charge of the 237Bk composite nucleus.…”

Section: Introductionmentioning

confidence: 95%

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Coincidence studies of heavy fragment pairs in the reaction 343 MeV40Ar+197Au

et al. 1982

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Nuclear Reactions: 197Au (~~ fission-like reactions), E=343MeV, measured energy and angular correlations for heavy-fragment pairs. Evolution shown from fission-like to projectile-target-like products. Analysis made of the fission-like reactions in terms of complete vs. incomplete fusion.Measurements are reported for correlated energies and angles of heavy fragments from reactions of 343 MeV ~~ with 197Au. The results show a continuous evolution of the mass distributions from fission-like products at angle pairs of ~60 and 300 degrees to deeply inelastic projectile-like products at ~45 ~ and 300 ~ Certain difficulties are emphasized for the use of the "symmetric fragmentation" cross sections in the context of current theoretical models (e.g. the "extra push" theory). The fission-like reactions have been studied in some detail and the results have been compared to a Monte Carlo kinematic simulation. To account for the experimental results forward-peaked light particle emission (n, H, He) must occur in a large fraction of the fission-like reactions.

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Section: B the "Extra-push" Theory And Its Parametrizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Coincidence studies of heavy fragment pairs in the reaction 343 MeV40Ar+197Au

et al. 1982

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“…The calculated spectra agree well with the spectrum of c~-heavy-ion relative energies extracted from the coincident data at small relative angles (0n.L= +37.5 ~ 0~= +27~ However, the calculated a-multiplicity M~ depends strongly on the isotopic number of the Ar nucleus, ranging from M~=0.6(36Ar) to M~=0.08(*~ A similar variation of M~ with neutron number is found for the adjacent elements. Actually, the N/Z ratio of isotopes observed in deep-inelastic Ar+Au collisions peaks around the value of 1.25 (36S, 4~Ar, 45Ca) [6]. For the primary isotopes a still higher neutron excess is expected, probably the one corresponding to the intermediate system, i.e.…”

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confidence: 94%

Fast emission of?-particles in deep-inelastic36Ar+197Au collisions

et al. 1982

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Angular and energy correlations between e-particles and deep-inelastic projectile-like fragments were measured for the system a6Ar+ *97Au at ELa b = 380 MeV. At most half of the coincident events can be attributed to statistical emission of e-particles from the fully accelerated projectile-like fragments. The remainder of the events may be due to direct emission during the first 10-22 s of the scattering process and to preequilibrium processes taking place within some 10 21 s.During the last few years many experiments have been performed with the aim to clarify the reaction mechanisms of the production of fast light particles in heavy-ion collisions [1,2]. For the majority of the cases studied the underlying reaction mechanisms turned out to be evaporation from fully accelerated fragments. In a recent study of the 14N + 159Tb system [2], in addition to the sequential-decay component an "uncorrelated" component was attributed to inelastic breakup. In a previous paper [3] we presented the results of the analysis of quasi-elastic 36Ar + 197Au collisions. In that system, almost all of the coincident events could be understood in terms of the statistical decay of long-living (10-17 s) levels of the emitting fragments. The same interpretation was found to be valid for quasi-elastic ZONe+ 197Au and 2~ + 4~ collisions at EL,b = 290 MeV [4]. In those systems the conclusions were even more stringent, since in the spectrum of relative energies between the outgoing coincident fragments (for example 160 + cQ well-known states of/ONe were observed. In contrast to our previous investigations, this paper * Also Fachbereich Physik der Freien Universit/it Berlin, Germany ** Now at LASL, Los Alamos, NM 87545, USA deals with deep-inlastic projectile-like fragments accompanied by coincident a-particles. The experiment was performed at the VICKSI accelerator of the Hahn-Meitner-Institute and is described in [3]. The heavy ions were detected at 0H.I= 37.5 ~ by means of solid-state E-A E telescopes and the e-particles were detected in the angular range 8 ~ 165 ~ on both sides of the beam using solid-state E-AE telescopes at large angles and a proportional-counter (AE) -scintillator-photomultiplier (E) telescope at forward angles. The velocity plot shown in Fig. 1 a displays the spectrum of the e-particles detected in coincidence with deep-inelastic projectile-like heavy ions in the range of atomic numbers 14

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“…12-20, 61, 62, 71, 86, 87, 98, 104, 105, 130--132, 143, 145, 158, 173, 197, 198, 217, 223, 225, 229, 258, 274, 282,283, 307,308, 312, 316,325-327, 330, 333, 336-338, 357-359, 378 13C : 21, 22, 63-65 14C : 66 14N : 3-5, 23-38, 67, 68, 72, 73, 106, 163, 17 4, 175, 184, 216, 221, 226, 230, 292, 293, 339, 379 15N : 29, 30, 107 160: 1,6, 31-39, 74-8 2, 88, 89,99, 100, 108-1 14, 133-136, 144, 146, 148, 149, 157, 172, 176, 177, 185, 199-201, 204, 220, 228, 255, 259, 263, 265, 271, 273, 275-278, 287, 294, 295, 304, 309, 310, 313, 314, 320, 321, 328, 331, 334, 340, 341-343, 352, 353, 360--362, 380 170: 7, 8, 40--42, 69,83, 115 180: 2, 43-47, 70, 90, 116, 1 17, 137, 264 '9F : 48-51, 85, 91, 288, 3l7, 322 2°Ne : 52-55, 92, 118-122, 150,.151, 202, 231, 256, 266, 267, 296, 297, 323, 332, 344-346, 363, 364, 371, 381 22Ne : 289 24 Mg : 93, 138, 203 26 Mg : 9 4 126,159,160,166,168,179,180,186,188,189,190,193, 218,236,242,243,247,248,[260][261][262]209,222,227,232,241,245,249,269,270,272,280,281, 291,[298][299][300]318,319,324,[347][348][349]…”

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confidence: 99%

Fusion Reactions Between Heavy Nuclei

Birkelund¹,

Huizenga²

1983

Annu. Rev. Nucl. Part. Sci.

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The most general theoretical models (1-3) of nuclear fusion reactions conceive the process as a motion of the target and projectile across a potential energy surface created by the forces between the two nuclei. The internuclear potential energy is a function of the separation of the two nuclei, the angular momentum of the system, and the deformation of the 1 Work su pported by th e US Department of Energy.

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Fusion and deep inelastic collisions studied on the Ar + Au system

Abstract: Atomic numbers and masses have been identified for the fragments (12

Cited by 19 publications

References 20 publications

Coincidence studies of heavy fragment pairs in the reaction 343 MeV40Ar+197Au

Coincidence studies of heavy fragment pairs in the reaction 343 MeV40Ar+197Au

Fast emission of?-particles in deep-inelastic36Ar+197Au collisions

Fusion Reactions Between Heavy Nuclei

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