ADOPTED LEVELS for 107Zr

Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 10-JUN-2015 

Author: Jean Blachot |  Citation: Nucl. Data Sheets 109, 1383 (2008) |  Cutoff date: 1-Mar-2008 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=9450 keV SYS(n)= 3430 keV SYS(p)= 15510 keV SYQ(α)= -9270 keV SY
Reference: 2012WA38

General Comments:

1994Be24, 1998Do08: 107Zr produced in Pb(238U,F), E=750 MeV/nucleon reaction and identified by time-of-flight at GSI

1997So07: 107Zr produced in 208Pb(238U,F),E=20 MeV/nucleon

2009Pe06: 107Zr formed by fragmentation of 136Xe beam at 120 MeV/nucleon at NSCL facility using Coupled Cyclotrons and A1900 fragment separator. The time-of-flight and transversal positions of each particle was measured using two plastic scintillators. The ΔE energy loss in a Si PIN detector was measured which, when combined with time-of-flight (tof) and transversal position measurements, allowed for an event-by-event identification of the transmitted nuclei. Transmitted nuclei and their β decays were measured using the β counting system consisting of four Si PIN detectors and a double-sided Si strip detector. β-delayed neutrons were measured in coincidence with β-decay precursor using neutron emission ratio observer (NERO) detector consisting of 60 proportional gas counter tubes embedded in polyethylene moderator matrix. The γ rays were measured with SeGA Ge detectors. Measured isotopic half-lives and delayed neutron emission probabilities Isotopic half-life was measured by 2009Pe06 from least-squares fit and maximum likelihood method of time differences of implantations and correlated β decay events.

2011Ni01: 107Zr nuclide produced in Be(238U,F) reactions at E=345 MeV/nucleon produced by the cascade operation of the RBIF complex of accelerators at RIKEN. Target=550 mg/cm2. Identification of 107Zr made on the basis of magnetic rigidity, time-of-flight and energy loss. The separated nuclei were implanted in a nine-layer double-sided silicon-strip detector (DSSSD). Correlations were recorded between the heavy ions and β rays. The half-life of 107Zr isotope was measured from the correlated ion-β decay curves and maximum likelihood analysis technique. In the analysis of the decay curve, β-detection efficiency, background rate, daughter and granddaughter (including those populated in delayed neutron decays) half-lives, and β-delayed neutron emission probabilities were considered. Comparison of measured half-lives with FRDM+QRPA and KTUY+GT2 calculations

2015Lo04: 107Zr nuclide produced at RIBF-RIKEN facility in 9Be(238U,F) reaction at E=345 MeV/nucleon with an average intensity of 6×1010 ions/s. Identification of 107Zr was made by determining atomic Z and mass-to-charge ratio α/Q, where Q=charge state of the ions. The selectivity of ions was based on magnetic rigidity, time-of-flight and energy loss. The separated nuclei were implanted at a rate of 50 ions/s in a stack of eight double-sided silicon-strip detector (WAS3ABi), surrounded by EURICA array of 84 HPGe detectors. Correlations were recorded between the implanted ions and β rays. The half-life of 107Zr isotope was measured from the correlated ion-β decay curves and maximum likelihood analysis technique as described in 2014Xu07. Comparison of measured half-lives with FRDM+QRPA, KTUY+GT2 and DF3+CQRPA theoretical calculations

Q-value: Estimated uncertainties (2012Wa38): 300 for Q(β-), 360 for S(n) and Q(α), 590 for S(p)

Q-value: Q(β-n)=3860 300, S(2n)=8940 300, S(2p)=30240 590 (syst, 2012Wa38)




E(level)
(keV)
T1/2(level)
  0 146 ms 4 
% β- = 100
% β-n ≤ 23

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  0 146 ms 4 
% β- = 100
% β-n ≤ 23
Theoretical %β-n=1.5 (2003Mo09).

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