Dynamical Effects in the Region of Heavy and Super-Heavy Nuclei
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概要
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The transfer-induced fission channel has been studied in the collision of 340 MeV ^<28>Si on ^<232>Th as a function of the atomic number of the projectile-like fragments (PLF) by using a 4π detector array. The average excitation energy of the target-like fragment (TLF) is derived from the measured energy loss, whereas its angular momentum has been obtained from the angular distribution of fission fragments. The measured ratio of transfer-fission yield to PLF singles, Y_f, first increase up to a net charge transfer ΔZ = 4, then shows a plateau around the values Y_f = 0.4 - 0.6. This ratio can be identified as the cumulative fission probability of the populated nuclei for net charge transfer ΔZ ≤ 6, suggesting a significant survival probability against fission of these TLF nuclei, in marked disagreement with the standard statistical model predictions. The observed survival probability implies that there is a strong hindrance to fission in the early stages of the deexcitation, such effects are important in the population of nuclei in the heavy and superheavy mass region by transfer reactions. Moreover pre- and post-scission multiplicities of neutrons and alpha particles have been simultaneously measured for the fission-like channel of the same reaction. Dynamical model calculations using HICOL code predict that 90% of the observed events are of quasifission type while the remaining 10% are from compound nucleus fission decay. From a comparison of PACE2 Statistical Model predictions with the measured pre-scission neutron multiplicity, the fission delay is estimated to be of 5^<+7>_<-3>×10^<-20>s, which overlaps with the average duration of fission-like process from the contact to the scission point (2×10^<-20>s) as determined from HICOL-based dynamical calculations.
- 理論物理学刊行会の論文
- 2004-07-30
著者
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Saxena A
Nuclear Physics Division Bhabha Atomic Research Center
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SAXENA A.
Theoretical Division, Los Alamos National Laboratory
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Prete G.
Infn Laboratori Nazionali Di Legnaro
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Fabris D.
Dipartimento Di Fisica And Sezione Infn Padova
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Fioretto E.
Infn Legnaro National Laboratories
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Fioretto E.
Infn Laboratori Nazionali Di Legnaro
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Moretto S.
Dipartimento Di Fisica And Sezione Infn Padova
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SAXENA A.
Nuclear Physics Division, Bhabha Atomic Research Center
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SHETTY D.
INFN Laboratori Nazionali di Legnaro
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VIESTI G.
Dipartimento di Fisica and Sezione INFN Padova
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NAYAK B.
Nuclear Physics Division, Bhabha Atomic Research Center
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BISWAS D.
Nuclear Physics Division, Bhabha Atomic Research Center
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CHOUDHURY R.
Nuclear Physics Division, Bhabha Atomic Research Center
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KAPOOR S.
Nuclear Physics Division, Bhabha Atomic Research Center
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BARBUI M.
INFN Laboratori Nazionali di Legnaro
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CINAUSERO M.
INFN Laboratori Nazionali di Legnaro
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LUNARDON M.
Dipartimento di Fisica and Sezione INFN Padova
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NEBBIA G.
Dipartimento di Fisica and Sezione INFN Padova
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PESENTE S.
Dipartimento di Fisica and Sezione INFN Padova
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SAMANT A.
Dipartimento di Fisica and Sezione INFN Padova
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BRONDI A.
Dipartimento di Scienze Fisiche and Sezione INFN Napoli
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RANA G.
Dipartimento di Scienze Fisiche and Sezione INFN Napoli
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MORO R.
Dipartimento di Scienze Fisiche and Sezione INFN Napoli
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VARDACI E.
Dipartimento di Scienze Fisiche and Sezione INFN Napoli
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CELLI N.
Dipartimento di Fisica and Sezione INFN Firenze
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LUCARELLI F.
Dipartimento di Fisica and Sezione INFN Firenze
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Kapoor S.
Nuclear Physics Division Bhabha Atomic Research Center
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Choudhury R.
Nuclear Physics Division Bhabha Atomic Research Center:institute Of Physics
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Biswas D.
Nuclear Physics Division Bhabha Atomic Research Center
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CHOUDHURY R.
Nuclear Physics Division, Bhabha Atomic Research Center:Institute of Physics
関連論文
- Spectroscopy of neutron-rich nuclei in the iron-chromium region(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
- Fusion Hindrance and Quasi-Fission in ^Ca Induced Reactions
- Optical and Raman Signatures of Polarons in Mixed-Valent Linear Chain Metal Complexes with Halogen Bridges
- Multinucleon Transfer Reactions Studied with Magnetic Spectrometers
- Dynamical Effects in the Region of Heavy and Super-Heavy Nuclei
- Subbarrier Fusion and Barrier Distributions of ^Ca+^Zr