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

被引：14

作者：

Gupta, Y. K. ^{[1
]}

Biswas, D. C. ^{[1
]}

Choudhury, R. K. ^{[1
]}

Saxena, A. ^{[1
]}

Nayak, B. K. ^{[1
]}

John, Bency ^{[1
]}

Ramachandran, K. ^{[1
]}

Thomas, R. G. ^{[1
]}

Danu, L. S. ^{[1
]}

Joshi, B. N. ^{[1
]}

Mahata, K. ^{[1
]}

Pandit, S. K. ^{[1
]}

Chatterjee, A. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Div Nucl Phys, Bombay 400085, Maharashtra, India

来源：

PHYSICAL REVIEW C | 2011年 / 84卷 / 03期

关键词：

STATISTICAL-MODEL; TERNARY FISSION; EMISSION; FRAGMENTS;

D O I：

10.1103/PhysRevC.84.031603

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 B-11 (62 MeV) + Th-232 reaction. The alpha-particle multiplicity spectra have been fitted with moving source model to extract the prescission (alpha(pre)) and near-scission (alpha(nse)) components. The present results, along with available data from the literature over a wide range of Z(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(pre) values when normalized to E-CN(2.3) (E-CN is the compound nucleus excitation energy) show a systematic linearly increasing trend with the alpha-particle emission Q value (Q(alpha)). The fraction of near-scission multiplicity is observed to be nearly the same at around 10% of the total prescission multiplicity for all the systems.

引用

页数：6

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