Constraining the ground-state spin of <sup>71</sup>Kr by β-delayed proton emission
ORAL
Abstract
Nuclei in the vicinity of the N=Z line are a sensitive probe of isospin symmetry. In particular, the character of low-lying and ground states of the T=1/2 mirror pair, 71Kr and 71Br, has been under debate for several decades where 71Br has a first-excited state energy of only 10 keV. β-delayed protons emitted from 71Kr were measured via an implantation-decay experiment at NSCL using the Beta counting station coupled to SeGA. We report results on the first experimental observation of β-decay feeding the 407-keV level in 71Br and delayed-proton feeding to the 944-keV state of 70Se. Several methods for determining the β-delayed proton branching were investigated, highlighting an often-neglected source of systematic error. The intensity of γ-ray transitions was used to build the low lying β-decay scheme of 71Kr, allowing for a better understanding of the symmetry between 71Kr and 71Br. This material is based upon work supported by the U.S. DOE, Office of Science, Office of Nuclear Physics under Award No. DE- FG02-94ER40848, DE-FG02-88ER40387 and DE-AC02-06CH11357; the NNSA through the Nuclear Science and Security Consortium under Award No. DE-NA0003180, DE-NA0003221, DE-NA0002132 and DE- NA0000979; and the NSF under Contract No. PHY-1102511.
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Presenters
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Sanjanee W Waniganeththi
- University of Massachusetts Lowell