Abstract
Possibility to use Modular Total Absorption Spectrometer (MTAS) as a device to measure complete decay scheme, including β-n of neutron rich isotopes, has been investigated. Analysis of well known 87Br with its 2.6% β-n branching ratio served as a test case. Preliminary results agree with the published data.
Highlights
Beta decay is one of the fundamental transformations of atomic nuclei
Beta decay and in particular β-delayed neutron emission plays an important role in the astrophysical r-process [1, 2], and in the nuclear reactor physics
The 87Br was one of many uranium fission products, which decays have been measured in Holifield Radioactive Ion Beam Facility (HRIBF) at the Oak Ridge National Laboratory
Summary
Beta decay is one of the fundamental transformations of atomic nuclei. In most of the cases apart from ground state to ground state transformations, β decay goes to the excited states in the daughter nuclei, followed by the γ-ray deexcitations. For nuclei with large enough Q-value β decay to neutron unbound states becomes possible In such cases neutron emission can be observed. Beta decay and in particular β-delayed neutron emission plays an important role in the astrophysical r-process [1, 2], and in the nuclear reactor physics. In the latter case criticality of the reactor depends on the β-n and the cumulative fission yields which are used in many calculations, including decay heat calculations [3]. Recent work of E.Valencia et al [8] reports the total absorption studies of this isotope, with the striking conclusion that competition between β-delayed γ rays and neutrons reaches levels ≈ 500 keV above the neutron separation energy in 87Kr (Sn=5515.17(25) keV [7])
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