ADOPTED LEVELS, GAMMAS for 48Fe

Author: Jun Chen |  Citation: Nucl. Data Sheets 179, 1 (2022) |  Cutoff date: 30-Nov-2021 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-19740 keV SYS(n)= 18950 keV SYS(p)= 2.73×103 keV 10Q(α)= -7.01×103 keV 11
Reference: 2021WA16

References:
  A  49Ni εp decay  B  9Be(49Fe,xγ)

General Comments:

Mass measurement:

2020Fu05: measured mass excess=-18009 keV 92 at the HIRFL-CSR acceleration complex at Lanzhou, using the isochronous mass spectrometry (IMS) with the experimental cooler storage ring (CSRe).

Other measurements:

2016Or03: 48Fe was produced in fragmentation of 74.5 MeV/nucleon 58Ni beam on a 200 μm thick natural Ni target at LISE3-GANIL facility. Fragments were selected by LISE3 separator and implanted into a double-sided silicon strip detector (DSSSD), surrounded by four EXOGAM Ge clovers for γ ray detection. Implantations were identified by energy loss ΔE and time-of-flight (tof) information. Measured Ep, Ip, 48Fe half-life, delayed proton decay branches.

1996Fa09: 9Be(58Ni,X) E=650 MeV/nucleon. Measured projectile-like fragments at 0|’, fragment recoil separator; mag spect, ΔE/E counter telescope (Si), tof).

Others: 2016Bl05, 2002Pf03, 1994Bl10, 1993Bu04, 1987Po04

Consult Nuclear Science References for theoretical studies.

Level scheme is tentatively proposed by 2021Ya33 based on comparisons with that of the mirror nucleus 48Ti

Q-value: ΔQ(β-)=510, ΔS(n)=510 (syst,2021Wa16)

Q-value: S(2n)=35360 310 (syst), S(2p)=3110 90, Q(ε)=11290 90, Q(εp)=9270 90 (2021Wa16)









E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)Final Levels
     0.0AB 0+ 45.5 ms 8 
% ε = 100
% εp = 15.3 8
    
   969.5 5 AB (2+)      969.5 5 
  100
     0.0
0+
  2253.5 11 ? B (4+)     1284 1 
  100
   969.5
(2+)
  2377 3 ? B (2+)     1407 3 
  100
   969.5
(2+)
  3197.5 23 ? B (4+)      944 2 ?
  100
  2253.5
(4+)
  3241.5 21 ? B (6+)      988 3 
  100
  2253.5
(4+)
  3475 5 ? B (3-)     2505 5 
  100
   969.5
(2+)
  3497.5 20 ? B (6+)      256 1 
  1244 2 
  100 16 
   79 16 
  3241.5
  2253.5
(6+)
(4+)
  4205 4 ? B (5-)     1951 4 ?
  100
  2253.5
(4+)

E(level): From a least-squares fit to γ-ray energies

Jπ(level): Proposed in 2021Ya33 in (49Fe,Xγ) based on comparions with mirror nucleus 48Ti and shell-model predictions

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 45.5 ms 8 
% ε = 100
% εp = 15.3 8
%εp: weighted average of 14.4 7 (2016Or03) and 15.9 6 (2007Do17). Other: >3.6 11 for E(p)=959 keV 33 (1996Fa09).
E(level): %εp: weighted average of 14.4 7 (2016Or03) and 15.9 6 (2007Do17). Other: >3.6 11 for E(p)=959 keV 33 (1996Fa09).

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Additional Gamma Comments:

E(level)E(gamma)Comments
   969.5   969.5E(γ): from 2007Do17. Other: 971 1 from (49Fe,Xγ) (2021Ya33)

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