2018Hu13: production and identification of ²²⁴Np nuclide in ¹⁸⁷Re(⁴⁰Ar,3n),E=188 MeV reaction, and the observation of six correlated α-decay chains, starting from ²²⁴Np: ²²⁴Np |) ²²⁰Pa |) ²¹⁶Ac |) ²¹²Fr. The ⁴⁰Ar beam from the Sector-Focusing Cyclotron (SFC) of the Heavy Ion Research Facility in Lanzhou (HIRFL). Target=enriched ¹⁸⁷Re, 460-μg/cm² thick. Evaporation residues (Er) were identified and separated using SHANS separator, and implanted into a 300-μm double-sided silicon strip detector (DSSD). Measured ERs, Eα, Iα, Er-α correlated events, and half-life of the decay of ²²⁴Np g.s. FWHM=22 keV for non-pileup α events, and 55 or 70 keV for overlapping α signals.

Theoretical calculations: two references extracted from the NSR database are listed in document records.

History of decay chains observed by 2018Hu13:

Er=Evaporation residues. Part=partial α energy deposit

Event #1: E(Er)=12566 keV

E_α1=9144 keV 23, Δt₁=0.66 μs, assigned to ²²⁴Np

E_α2=9522 keV 45, Δt₂=580 ns, assigned to ²²⁰Pa

E_α3=9058 keV 9, Δt₃=310.78 μs, assigned to ²¹⁶Ac

Event #2: E(Er)=14138 keV

E_α1=9154 keV 23, Δt₁=160.71 μs, assigned to ²²⁴Np

E_α2=9587 keV 23, Δt₂=680 ns, assigned to ²²⁰Pa

E_α3=1912 keV 9 (part), Δt₃=600.43 μs, assigned to ²¹⁶Ac

Event #3: E(Er)=13704 keV

E_α1=9144 keV 60, Δt₁=24.07 μs, assigned to ²²⁴Np

E_α2=9531 keV 60, Δt₂=220 ns, assigned to ²²⁰Pa

E_α3: escaped α

Event #4: E(Er)=13233 keV

E_α1=9104 keV 60, Δt₁=68.93 μs, assigned to ²²⁴Np

E_α2=644 keV 60 (part), Δt₂=240 ns, assigned to ²²⁰Pa

E_α3=9082 keV 9, Δt₃=166.08 μs, assigned to ²¹⁶Ac

Event #5: E(Er)=12579 keV

E_α1=479 keV 30 (part), Δt₁=70.81 μs, assigned to ²²⁴Np

E_α2=9572 keV 30, Δt₂=500 ns, assigned to ²²⁰Pa

E_α3=8976 keV 9, Δt₃=527.34 μs, assigned to ²¹⁶Ac

Event #6: E(Er)=13144 keV

E_α1=8868 keV 60, Δt₁=4.89 μs, assigned to ²²⁴Np

E_α2=9811 keV 60, Δt₂=100 ns, assigned to ²²⁰Pa

E_α3=9067 keV 9, Δt₃=431.74 μs, assigned to ²¹⁶Ac

Q-value: S(2n)=15390 50, S(2p)=4610 90, Q(ε)=6290 30, Q(εp)=2410 80 (2021Wa16)