Authors: Balraj Singh and Michael Birch |  Citation: ENSDF |  Cutoff date: 30-SEP-2013 

Author: S. -c. Wu |  Citation: Nucl. Data Sheets 106, 367 (2005) |  Cutoff date: 31-Aug-2005 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=3710 keV SYS(n)= 4560 keV SYS(p)= 10290 keV CAQ(α)= -660 keV SY
Reference: 2012Wa38,1997MO25

General Comments:

2012Ku26: 181Yb produced and identified in 9Be(238U,F), E=1 GeV/nucleon reaction using SIS-18 synchrotron facility at GSI. Target=1.6 g/cm2 9Be placed at the entrance of projectile Fragment Separator (FRS). Particle identification was achieved by event-by-event in-flight analysis of time-of-flight, energy loss measurement, and magnetic rigidity (tof-ΔE’-Bρ). Time-of-flight measured using two plastic scintillation detectors, energy loss or deposit by ionization chambers (MUSIC), and magnetic rigidity by four time-projection chambers (TPC), which also provided energy deposit information. Isomer tagging method for known μs isomers was used to verify event-by-event identification and in-flight separation of new isotopes. Gamma rays from the known isomers were recorded in coincidence with the incoming ions using either the RISING array of Ge detectors at GSI or only two Ge detectors, a stopper foil and a scintillator for veto signal. Measured production cross section. Comparison of measured σ with predictions from ABRABLA model and EPAX-3 model

Earlier secondary report:

2000PoZY: events of 181Yb identified in Be(208Pb,X), E=1 GeV/nucleon at GSI; Fragment separator, time of flight, energy loss and position technique.

Nuclear structure calculations: 2005Pa21, 1983Sa22

Q-value: Estimated uncertainties (2012Wa38): ΔQ-=340, ΔS(n)=420, ΔS(α)=590

Q-value: S(p) from 1997Mo25; others from 2012Wa38

Q-value: S(2n)=10690 360 from 2012Wa38 (syst). S(2p)=19430 (1997Mo25, theory).

  0 > 160 ns
% β- = ?

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Additional Level Data and Comments:

  0 > 160 ns
% β- = ?
Only β- decay mode is expected.
E(level): Only β- decay mode is expected.

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