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The evidence of N=16 shell closure and β-delayed neutron emission from ²⁵F

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arxiv 2412.12071 v1 pith:UHAKKBQG submitted 2024-12-16 nucl-ex

The evidence of N=16 shell closure and β-delayed neutron emission from ²⁵F

classification nucl-ex
keywords betaneutrondecaydelayedemissionfribshellagrees
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We measured the $\beta$-delayed neutron emission from $^{25}$F for the first time at the Facility for Rare Isotope Beams (FRIB). Using combined neutron and $\gamma$-ray detector systems of the FRIB Decay Station Initiator (FDSi), we observed $\beta$-decay transitions populating neutron unbound states between 4.2 and 8 MeV in $^{25}$Ne. The experimental results led to the revision of the $\beta$-decay half-life and $\beta$-delayed neutron-emission probability of $^{25}$F. The $\beta$-decay strength distribution of $^{25}$F extracted from the data agrees with the shell-model predictions using the USDB and SDPF-M effective interactions. This result indicates that the spherical neutron $N = 16$ shell gap persists in $^{25}$F and $^{25}$Ne.

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