Author: T. W. Burrows |  Citation: Nucl. Data Sheets 109, 171 (2008) |  Cutoff date: 30-Oct-2007 

 Full ENSDF file | Adopted Levels (PDF version) 

S(p)= 5.E2 keV SY
Reference: 2012WA38

General Comments:

2001Gi02: Ni(58Ni,X) E=74.5 MeV/α. Fragments selected by the α-LISE3 separator with a 10.4 mg/cm2 shaped Be degrader and Wien filter at GANIL. Ions implanted in a 5 Si-detector telescope which measured ΔE, E, and position. With tof measurements started both by the cyclotrons’ high-frequency and a micro-channel plate detector before before the Wien filter, implanted ions could Be identified. The telescope was surrounded by Ge detectors to measure γ’s in the radioactive decay. 50 45Fe events observed. 2001Gi02 obtained T1/2=6.0 ms +17-3. No evidence of 2p decay and no pγ coincidences observed.

2002Gi09: Ni(58Ni,X) E=75 MeV/α. Fragments selected by the α-LISE3 separator with intermediate 50-μm Be degrader at GANIL. Two-channel plate dection systems for timing purposes at first LISE focal point; three Si detectors and one Si-strip detector with 16×16 x-y strips. Fragments identified by tof and their energy loss in all detectors. 22 45Fe implantations identified. For decay events occuring less than 15 ms after a 45Fe implantations the spectrum exhibits a pronounced peak at 1.14 MeV 5. For α decay time between 15 and 100 ms the 1.14 MeV peak almost completely disappeared and other events higher in decay energy appear; these counts are consistent with the decay-energy spectrum of 43Cr (2001Gi01). T1/2=4.7 ms 34-14 from a one-component fit to the decay-time spectrum gated by the 1.14 MeV peak and 5.7 ms +27-14 from a two-component fit to the decay-time spectrum of events up to 100 ms. %2p estimated to Be 70 to 80. No evidence of 511γ’s associated with β+ decay observed.

2002Pf02, 2002Pf03: Be(58Ni,X) E=650 MeV/α. Fragments selected by the FRS at GSI. Fragments identified in flight using a detector setup consisting 3 plastic scintillator and a four-fold ionization chamber (MUSIC). MUSIC provided ΔE information and the scintillators served for position and tof measurements. After identification ions were slowed by a variable thickness Al degrader and implanted into an 8 Si detector telescope. The telescope was mounted in a six NaI(Tl) crystals "SPLIT barrel. " six 45Fe events were identified; one event with α decay energy and time of 10.01 MeV 10 and 3.395 ms was coincident with a 900 keV γ and was interpreted as either a 45Fe β+p event or the β+ decay of 43Cr following 45Fe 2p decay; decay signals were lost for one event due to a malfunction; and the remaining four events had decay energies between 990 keV 130 and 1200 keV 100 and times between 0.644 ms and 12.617 ms. 2002Pf02 obtained T1/2=3.2 ms +26-10 using the method of 1984Sc13, α decay energy of 1.1 MeV 1, and %2p≈80% for five events. No evidence of 511γ’s associated with β+ decay observed.

2005Do20, 2005Bl31, 2005Gi15: Ni(58Ni,X) E=74.5 MeV/α. Fragments selected by the α-LISE3 separator at GANIL. Fragments identified and decay properties studied using two microchannel plate (MCP) detectors at the first LISE focal plane and four Si detectors at the end of the lise beam line. Measured ΔE, tof with respect to the two MCP detectors and the radiofrequency of the cyclotron. β’s detected from decays of fragments stopped in an adjacent silicon-strip detector (DSSSD). The DSSSD was a 500 μm thick Si detector with 16 x-strips and 16 y-strips and was used to detect the fragments residual energy and decay properties. Observed 17 45Fe decay events with α decay energy of 1.154 MeV 16 out of 30 implantations. See 2005Do20 for arguments on assigning these events to the 2p decay mode. T1/2=1.6 ms +5-3 if energy signal is in the peak at 1.154 MeV; T1/2=1.4 ms +3-2 for all first decay events. 2005Do20 used the first value. %2p=57 10.

2007GiZZ: Ni(58Ni,X) E=75 MeV/α. Fragments selected by a magnetic-rigidity, an energy-loss, and a velocity analyzer using the α spectrometer and the LISE3 separator (with 500 μm Be energy degrader) at GANIL. tof, energy-loss and residual energy measurements allowed event-by-event identification of the individual fragments. Fragments implanted in the center of a time-projection chamber (TPC). Charges of primary ionizing particles multiplied by four gas electron multipliers and detected by two orthoganal sets of 768 strips with a 200 |um pitch. 10 45Fe implantations observed which could Be associated with decays. About five other decay events were lost. First direct observation of the emission of two protons in the g.s. decay of a long-lived two-proton emitter. Analysis is still to Be completed.

Others: 1992Bo37, 1996Bl21, and 2002Ch28

Q-value: Note: Current evaluation has used the following Q record

Q-value: Q(εp)=19.75 MeV 23 (syst)

Q-value: Q(2p)=1154 keV 16 from 2005Do20. Others: 1130 keV 40 (2003Au03. Syst), 1.14 MeV 5 (2002Gi09), and 1.1 MeV 1 (2002Pf02)

Jπ(level) T1/2(level)
  0.0 (3/2+) 1.89 ms +49-21 
% ε ≤ 43 10
% p = ?
% 2p = 57 10
% β+p ≤ 43 10

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Additional Level Data and Comments:


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