Neutron decay of the isobaric analog state in 208Bi

doi:10.1016/0375-9474(94)90239-9

Nuclear Physics A

Volume 574, Issue 3, 11 July 1994, Pages 453-466

https://doi.org/10.1016/0375-9474(94)90239-9 Get rights and content

Abstract

The isospin-forbidden neutron decay of the isobaric analog state in ²⁰⁸Bi has been measured, following its excitation via the ²⁰⁸Pb(³He,t)²⁰⁸Bi reaction at 61.2 MeV. In contrast to the proton decay, which is direct, the neutron decay spectrum has a statistical shape. Its branching ratio is determined to be (37 ± 3) %. The results suggest that the damping of the isospin impurity is fast. Therefore, neutron decay results mostly from the final stage of the damping process and does not contribute to the width of the IAS.

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Nuclear Data Sheets for A = 208
2007, Nuclear Data Sheets
Detailed level schemes, decay schemes, and the experimental data on which they are based are presented for all nuclei with mass number A = 208. The experimental data are evaluated; inconsistencies and discrepancies are noted; and adopted values for level and γ-ray energies, γ intensities, as well as for other nuclear properties are given. This evaluation replaces the A = 208 evaluation published by M.J. Martin in Nuclear Data Sheets 47, 797 (1986).
Neutron decay of deep hole states and isobaric analog states in 115Sn populated by the (3He, α) reaction at 102 MeV
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Neutron decay of excited hole states and isobaric analog states (IAS) populated by the ¹¹⁶Sn(³He,α) reaction at an energy of 102 MeV has been investigated. The α-particles were analysed in a magnetic spectrograph positioned at 1.4° and detected with a multiwire drift chamber. Excitation energies in ¹¹⁵Sn up to 23 MeV were studied. An array of neutron detectors was positioned around the target at angles ranging from 68° to 209°. The neutron data were analysed in terms of decay into final states, using statistical model calculations as a tool to extract lower limits of nonstatistical decay. Nonstatistical decay was observed from states up to an excitation energy of about 18 MeV. The neutron emission of the IAS is compatible with 100% statistical decay.
Neutron decay of deep-hole states in 89Zr populated by the 90Zr(3He,α)89Zr reaction at 102 MeV
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Neutron decay of excited hole states populated by the ⁹⁰Zr(³He,α) reaction at an incident energy of 102 MeV has been investigated. The α-particles were analysed in a magnetic spectrograph positioned at 1.4° and detected with a multi-wire drift chamber. Excitation energies in ⁸⁹Zr up to 26 MeV were studied. An array of neutron detectors was positioned around the target at angles ranging from 68° to 209°. The neutron data were analysed in terms of decay into final states, using statistical model calculations as a tool to extract non-statistical decay.
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¹: Present address: Rijksinstituut voor Volksgezondheid en Milieuhygiëne, Bilthoven, The Netherlands.

²: Present address: Department of Neutron Research, Uppsala University, Box 535, S-75121 Uppsala, Sweden.

³: Present address: Kernfysisch Versneller Instituut, 9747 AA Groningen, The Netherlands.

⁴: Present address: University of North Carolina, Chapel Hill, NC, USA.

⁵: Present address: Instituut voor Theoretische Fysica, Universiteit Leuven, Belgium.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 208

Neutron decay of deep hole states and isobaric analog states in <sup>115</sup>Sn populated by the (<sup>3</sup>He, α) reaction at 102 MeV

Neutron decay of deep-hole states in <sup>89</sup>Zr populated by the <sup>90</sup>Zr(<sup>3</sup>He,α)<sup>89</sup>Zr reaction at 102 MeV

Measurement of isospin mixing at a finite temperature in 80Zr via giant dipole resonance decay

Search for isovector giant monopole resonances via the <sup>124</sup>Sn(<sup>3</sup>He,tn) reaction

Neutron decay from the isobaric analog state in Sb120 populated in Sn120(3He,t)120Sb at E(3He) = 200 MeV, = 0°