Author: Balraj Singh |  Citation: Nucl. Data Sheets 156, 148 (2019) |  Cutoff date: 31-Jan-2019 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-3370 keV SYS(n)= 6680 keV SYS(p)= 4260 keV SYQ(α)= 9810 keV SY
Reference: 2017WA10

General Comments:

An earlier assignment of one EVR-α-α-SF correlated decay chain starting from 292Lv nuclide and ending in SF decay of 280Ds by the Dubna-Livermore collaboration in 2001Og01 and 2002Og09 (also 1999Og10,2000Og07, 2001Og06,2001Og11,2002Og03,2002Og09,2002Og13) by was later assigned by 2004Og07 and 2004Og12 (also 2005Og03) to 3n-reaction channel, instead, thus leading to the discovery of the 293Lv nuclide, whose decay chain ended in the SF decay of 281Ds

2017Ka66 (also 2014MoZV): three correlated events were reported in 248Cm(48Ca,4n),E=261.6 MeV reaction using RIKEN Linear Accelerator (RILAC) and gas-filled recoil ion separator (GARIS). Two EVR-α-α-SF correlated events, and the following one tentative EVR-α-α-α-SF event were observed, all starting from 292Lv, with production σ=3.1 pb +28-18 for 292Lv, two ending in 284Cn, the third ending either in 284Cn or in 280Ds. Possible correlated EVR-α-α-α-SF one event led to a tentative identification of the 280Ds isotope. Following is the detail of one of the two interpretations provided by 2017Ka66 for the third event, leading to tentative identification of 280Ds. The second interpretation of this event is simply the 292Lv |) 288Fl |) 284Cn α-decay chain, 284Cn decaying by SF decay.

Chain #3 (second interpretation): Energy of EVR=15.3 MeV:

Eα1=10.66 MeV 2, Δt1=4.1 ms, assigned to 292Lv

Eα2=0.83 MeV escaped α, Δt2=9.0 ms, assigned to 288Fl

Eα3=3.50 MeV escaped α, Δt3=282 ms, assigned to 284Cn

ESF=163 MeV, Δt4=9.6 ms, assigned to 280Ds: SF decay; SF decay events in coincidence with 393.1-keV γ ray

The assignment of an 11 s 6 activity to 280Ds in 2017Au03 (NUBASE-2016), based on 2001Og01, is erroneous, as 2001Og01 later reassigned the observed correlated event from 292Lv to 293Lv, leading to the SF-decaying 281Ds, rather than 280Ds.

For theoretical studies, consult Nuclear Science References (NSR) database at NNDC, BNL for 68 primary references dealing with the half-lives and other aspects of nuclear structure in this mass region

Q-value: Estimated uncertainties (2017Wa10): ΔQ(β-)=940, ΔS(n)=980, ΔS(p)=1030, ΔQ(α)=200.

Q-value: S(2n)=12000 1000 (syst,2017Wa10). S(2p)=8070 (1997Mo25, theory)

Jπ(level) T1/2(level)
  0? 0+ 7 ms +32-2 
% SF ≈ 100

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Additional Level Data and Comments:


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