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

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-6320 keV SYS(n)= 7890 keV SYS(p)= 3230 keV SYQ(α)= 9623 keV 16
Reference: 2017WA10

General Comments:

2010Ni14: 238U(34S,4n), E(c.m.)=152.0 MeV 34S beam produced by the linear accelerator UNILAC and the velocity filter SHIP at GSI in Darmstadt, beam intensity from 2.0 to 2.5 pμA. 238U target prepared by sputtering of depleted 238U metal on a 43 μg/cm2 carbon backing. The α-decay events and fission fragments were detected by a position sensitive 16-strip Si PIPS detector (stop detector) with an active area of 80×35 mm. α clover Ge detector was used to measure γ rays or x rays in coincidence with α particles and/or SF events. Measured σ, Eα, T1/2. FWHM for α particles=40 keV. One event was assigned by 2010Ni14 to the decay of 268Hs nuclide.

2010Gr04: 238U(36S,6n),E=256.4 MeV from UNILAC at GSI. Measured reaction products using COMPACT system of efficient and rapid chemical-separation and online detection based on the cry-thermo- chromatography method. Based on expected production cross section for 6n-channel and Eα, assignment to 268Hs in 2009Dv01 was excluded with certainty.

2009Dv01: 248Cm(25Mg,5n), E=140 MeV, provided by UNILAC at GSI. The α particles and fission fragments were detected using the Cryo Online Multidetector for Physics and Chemistry of Transactinides (COMPACT). Measured α and fission spectra. Deduced reaction cross sections. Transport time was ≈1 s. No decay chains were ascribed to the decay of 268Hs. Upper limit of cross section of 268Hs production was deduced from one event as σ<1.3 pb. Either 268Hs does not decay by α mode or its half-life is <0.5 s.

For theoretical studies, consult Nuclear Science References (NSR) database at NNDC, BNL for 73 primary references dealing with the half-lives and other aspects of nuclear structure in this mass region

Q-value: Estimated uncertainties (2017Wa10): ΔQ(β-)=370, ΔS(n)=300, ΔS(p)=390.

Q-value: S(2n)=14450 290, S(2p)=5370 380 (syst,2017Wa10)

Jπ(level) T1/2(level)
  0 0+ 0.4 s +18-2 
% α ≈ 100

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Additional Level Data and Comments:

  00+ 0.4 s +18-2 
% α ≈ 100
Only the α decay mode has been observed.
E(level): Only the α decay mode has been observed.

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