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Rapid decrease of fragment emission time in the range of 3–5 MeV/u excitation energy |
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| Authors: | M Louvel A Genoux-Lubain G Bizard R Bougault R Brou A Buta H Doubre D Durand Y El Masri H Fugiwara K Hagel T Hamdani F Hanappe S C Jeong G M Jin S Kato J L Laville C Le Brun J F Lecolley S M Lee T Matsuse T Motobayashi A Pghaire J Pter R Regimbart F Saint-Laurent J C Steckmeyer B Tamain |
| Institution: | a LPC ISMRA, F-14050, Caen Cedex, France b GANIL, F-14021, Caen Cedex, France c FNRS-IPN (UCL) B-1348, Louvain la Neuve, Belgium d Institute of Physics, University of Tsukuba, Ibaraki-ken 350, Japan e Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA f FNRS-ULB, B-1050, Bruxelles, Belgium g Institute of Modern Physics, Lanzhou, China h Shinshu University, Matsumoto, Nagano-ken, Japan i Rikkyo University, Toshima-ku, Tokyo 171, Japan |
| Abstract: | Multifragment emission processes from highly excited nuclei produced in 40Ar + 197Au reactions at incident energies of 30 and 60 MeV/u are compared. At the lowest bombarding energy and 3.3 MeV/u excitation energy, the composite system decay process supports the hypothesis of long-lived equilibrated nucleu decaying by successive binary splittings. For excited nuclei around 5 MeV/u, the depletion observed at small relative angles in the correlation functions is interpreted as the result of a strong reduction in the fragment emission time scale. |
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