Measurement of pre-fission neutrons from 200Pb; Further limits to the statistical fission parameters

D. Ward; R. J. Charity; D. J. Hinde; J. R. Leigh; J. O. Newton

doi:10.1016/0375-9474(83)90196-3

Measurement of pre-fission neutrons from ²⁰⁰Pb; Further limits to the statistical fission parameters

D. Ward
, R. J. Charity
, D. J. Hinde
, J. R. Leigh
, J. O. Newton

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

Abstract

The average number of pre-fission neutrons (ν_pre) emitted following fusion of ¹⁸¹Ta and ¹⁹F has been measured. The multiplicity is 2.1 ± 0.5, 2.7 ∓ 0.5 and 2.9 ∓ 0.5 at bombarding energies of 105, 115 and 125 MeV respectively. Thus, on average, fission occurs about half way down the neutron evaporation chain for ²⁰⁰Pb. Calculated values of ν_pre, from the statistical/rotating liquid drop model, are extremely sensitive to a_f a_n, the ratio of the level density parameters at the saddle point and equilibrium deformations. The results restrict the effective value of a_f a_n to 1.02 ± 0.02.

Original language	English
Pages (from-to)	189-204
Number of pages	16
Journal	Nuclear Physics, Section A
Volume	403
Issue number	1
DOIs	https://doi.org/10.1016/0375-9474(83)90196-3
State	Published - Jul 11 1983

Keywords

Nuclear reactions

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10.1016/0375-9474(83)90196-3

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title = "Measurement of pre-fission neutrons from 200Pb; Further limits to the statistical fission parameters",

abstract = "The average number of pre-fission neutrons (νpre) emitted following fusion of 181Ta and 19F has been measured. The multiplicity is 2.1 ± 0.5, 2.7 ∓ 0.5 and 2.9 ∓ 0.5 at bombarding energies of 105, 115 and 125 MeV respectively. Thus, on average, fission occurs about half way down the neutron evaporation chain for 200Pb. Calculated values of νpre, from the statistical/rotating liquid drop model, are extremely sensitive to af an, the ratio of the level density parameters at the saddle point and equilibrium deformations. The results restrict the effective value of af an to 1.02 ± 0.02.",

keywords = "Nuclear reactions",

author = "D. Ward and Charity, \{R. J.\} and Hinde, \{D. J.\} and Leigh, \{J. R.\} and Newton, \{J. O.\}",

year = "1983",

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doi = "10.1016/0375-9474(83)90196-3",

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T1 - Measurement of pre-fission neutrons from 200Pb; Further limits to the statistical fission parameters

AU - Ward, D.

AU - Charity, R. J.

AU - Hinde, D. J.

AU - Leigh, J. R.

AU - Newton, J. O.

PY - 1983/7/11

Y1 - 1983/7/11

N2 - The average number of pre-fission neutrons (νpre) emitted following fusion of 181Ta and 19F has been measured. The multiplicity is 2.1 ± 0.5, 2.7 ∓ 0.5 and 2.9 ∓ 0.5 at bombarding energies of 105, 115 and 125 MeV respectively. Thus, on average, fission occurs about half way down the neutron evaporation chain for 200Pb. Calculated values of νpre, from the statistical/rotating liquid drop model, are extremely sensitive to af an, the ratio of the level density parameters at the saddle point and equilibrium deformations. The results restrict the effective value of af an to 1.02 ± 0.02.

AB - The average number of pre-fission neutrons (νpre) emitted following fusion of 181Ta and 19F has been measured. The multiplicity is 2.1 ± 0.5, 2.7 ∓ 0.5 and 2.9 ∓ 0.5 at bombarding energies of 105, 115 and 125 MeV respectively. Thus, on average, fission occurs about half way down the neutron evaporation chain for 200Pb. Calculated values of νpre, from the statistical/rotating liquid drop model, are extremely sensitive to af an, the ratio of the level density parameters at the saddle point and equilibrium deformations. The results restrict the effective value of af an to 1.02 ± 0.02.

KW - Nuclear reactions

UR - https://www.scopus.com/pages/publications/0001381259

U2 - 10.1016/0375-9474(83)90196-3

DO - 10.1016/0375-9474(83)90196-3

M3 - Article

AN - SCOPUS:0001381259

SN - 0375-9474

VL - 403

SP - 189

EP - 204

JO - Nuclear Physics, Section A

JF - Nuclear Physics, Section A

IS - 1

ER -

Measurement of pre-fission neutrons from ²⁰⁰Pb; Further limits to the statistical fission parameters

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