Systematics of pre- and near-scission {alpha}-particle multiplicities in heavy-ion-induced fusion-fission reactions

Journal Article · Thu Sep 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.031603· OSTI ID:21596722

Gupta, Y K; Biswas, D C; Choudhury, R K; Saxena, A; Nayak, B K; John, Bency; Ramachandran, K; Thomas, R G; Danu, L S; Joshi, B N; Mahata, K; Pandit, S K; Chatterjee, A ^[1]

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1. Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)

The {alpha}-particle energy spectra have been measured in coincidence with fission fragments over a wide range of relative angles with respect to fragment emission direction in the {sup 11}B (62 MeV) + {sup 232}Th reaction. The {alpha}-particle multiplicity spectra have been fitted with moving source model to extract the precision ({alpha}{sub pre}) and near-scission ({alpha}{sub nse}) components. The present results, along with available data from the literature over a wide range of Z{sup 2}/A and the excitation energy of a compound system, have been analyzed to develop certain global features of the pre- and near-scission emission characteristics. It is seen that {alpha}{sub pre} values when normalized to E{sub CN}{sup 2.3} (E{sub CN} is the compound nucleus excitation energy) show a systematic linearly increasing trend with the {alpha}-particle emission Q value (Q{sub {alpha}}). The fraction of near-scission multiplicity is observed to be nearly the same at around 10% of the total precision multiplicity for all the systems.

• OSTI ID: 21596722
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 84, Issue 3; Other Information: DOI: 10.1103/PhysRevC.84.031603; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
BORON 11 REACTIONS
COMPOUND NUCLEI
EMISSION
ENERGY SPECTRA
EXCITATION
FISSION
FISSION FRAGMENTS
HEAVY IONS
MEV RANGE 10-100
MULTIPLICITY
Q-VALUE
THORIUM 232 TARGET
CHARGED PARTICLES
ENERGY
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
HEAVY ION REACTIONS
IONIZING RADIATIONS
IONS
MEV RANGE
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
RADIATIONS
SPECTRA
TARGETS