ADOPTED LEVELS, GAMMAS for 64Mn

Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 178, 41 (2021). |  Cutoff date: 12-Nov-2021 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=11981 keV 6S(n)= 4173 keV 5S(p)= 14100 keV 70Q(α)= -1.233×104 keV 18
Reference: 2021WA16

References:
  A  64Cr β- decay (42.9 MS)  B  64Mn IT decay (440 MS)

General Comments:

1985Gu14: 64Mn formed in fragmentation of 86Kr beam at 33 MeV/nucleon with Ti and Ta targets, identification by time-of-flight method using ΔE-E detectors at GANIL.

1994Se12 and 1990Tu01: Th(p,F) E=800 MeV reaction followed by time-of-flight detection of fission fragments to identify 64Mn and measured its mass using Time-of-Flight Isochronous (TOFI) spectrometer at the Los Alamos Meson Physics Facility (LAMPF)

1998Am04: 64Mn formed in fragmentation of 86Kr beam, fragment mass separator. Measured T1/2 at GSI.

1998Gr14: 64Mn formed in fragmentation of 86Kr beam at 60.3 MeV/nucleon with Ni target. Measured Eγ, Iγ, γ(t), (fragment)γ coin, T1/2 at GANIL.

2002MaZN (thesis): 64Mn obtained from fragmentation of 86Kr beam at 57.8 MeV/nucleon with a 9Be target, LISE2000 spectrometer at GANIL facility. Measured half-life from timing of β measurement.

2011Da08: 64Mn produced in the fragmentation of 57.8 MeV/nucleon 86Kr beam impinged on 50 mg/cm2 thick tantalum target using LISE-2000 spectrometer at GANIL facility. Detector system included a three-element Si-detector telescope containing a double-sided silicon-strip detector (DSSSD) backed by a Si(Li) detector and surrounded by four clover type EXOGAM Ge detectors. Product identified by mass, atomic number, charge, energy loss and time of flight. Measured half-life.

2012Na15: measured precise mass excess using RILIS facility and ISOLTRAP mass spectrometer at CERN facility

2015He28: measurement of spin, static magnetic dipole moment and electric quadrupole moment of the g.s. 64Mn beam produced in U(p,X) reaction at E(p)=1.4 GeV at CERN-ISOLDE facility using a RILIS ion source. Measured hyperfine structure using collinear laser spectroscopy (COLLAPS) technique. Deduced hyperfine constants for 3d54s2 6S5/2 -> 3d54s4p 6P3/2 ground state atomic transition with wave number=35689.980 cm-1, spin, magnetic dipole moment and electric quadrupole moment of the ground state of 64Mn. The magnetic dipole moment of 55Mn, μ=+3.46871790 9 was used as a standard reference for the other Mn isotopes. (Note: 2015He28 quote μ=+3.4687179 9 for 55Mn in their Table I). Comparison with large-scale shell-model calculations using GXPF1A and LNPS effective interactions, and with previous experimental results. The spin and moments for the (4+) isomer in 64Mn could not be measured in 2015He28 because of its short half-life of 0.44 ms

2016He14: E=1.4 GeV proton beam was produced from the ISOLDE facility at CERN. Target was a thick uranium carbide. Recoiling ions were ionized using the resonance ionization laser ion source (RILIS), mass-separated, cooled and bunched in the gas-filled RFQ ISCOOL, re-accelerated and guided to the laser spectroscopy beam line COLLAPS. Measured hyperfine spectra using collinear laser spectroscopy on atomic and ionic transitions, respectively. Deduced changes in mean-square charge radii relative to 55Mn. Comparisons with theoretical calculations. Systematics of neighboring nuclei.

Theory references for structure and other topics: four primary references in the NSR database at www.nndc.bnl.gov

Q-value: Q(β-n)=4575 6, S(2n)=10608 7, S(2p)=32350 260 (2021Wa16)










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0AB 1(+) 90 ms 4 
% β- = 100
% β-n = 2.7 6
     
    40.2 3  B (2-)      40.2 3 
  100
(E1)
     0.0
1(+)
   175.5 4  B (4+) 440 ms 49 
% IT = 100
  135.3 3 
  100
(M2)
    40.2
(2-)
   186.4 3 A  (2+)     186.4 3 
  100

     0.0
1(+)
  1148.7 4 A  (1+)     962.3 2 
  100

   186.4
(2+)

E(level): From Eγ data

M(γ): From ce data and intensity balance in 64Mn IT decay

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
    40.2 (2-)      40.2 3 (E1)0.6α=0.6 4
   175.5 (4+) 440 ms 49 
% IT = 100
  135.3 3 (M2)0.11B(M2)(W.u.)=8.8×10-5 +11-9, α=0.11 3

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.01(+) 90 ms 4 
% β- = 100
% β-n = 2.7 6
μ=+2.085 3 (2015He28,2019StZV), Q=+0.21 11 (2015He28,2021StZZ)
-n=2.7 6 in 2012Pa39, determined from the absolute intensity of the 995-keV γ ray (from 63Fe β- decay) as 43% 8 and the total number of 64Mn decays. Other: 33% 2 (2000HaZL, from β and n measurements).

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Additional Gamma Comments:

E(level)E(gamma)Comments
    40.2    40.2E(γ): from 64Mn IT decay
   175.5   135.3E(γ): from 64Mn IT decay
   186.4   186.4E(γ): from 64Cr β- decay
  1148.7   962.3E(γ): from 64Cr β- decay

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