ADOPTED LEVELS, GAMMAS for 32Al

Author: Jun Chen |  Citation: Nucl. Data Sheets 201, 1 (2025) |  Cutoff date: 31-Oct-2024 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=12978 keV 7S(n)= 4220 keV 8S(p)= 15266 keV 8Q(α)= -12536 keV 13
Reference: 2021WA16

References:
  A  32Mg β- decay (80.4 MS)  B  33Mg β-n decay (90.5 MS)
  C  4He(32Al,32Al’γ)  D  9Be(36S,xγ),(40Ar,xγ)
  E  208Pb(37Cl,xγ) 

General Comments:

The 32Al nuclide is relevant to structure of nuclides in the "island of inversion ".

Mass measurements: 2015Kw01, 1991Or01, 1987Gi05, 1986Vi09

Other measurements:

1971Ar32: first evidence of 32Al formation in 232Th(40Ar,X) reaction at 290 MeV.

1982Mu08: 32Al from 9Be(40Ar,X) E=11.4 GeV, measured half-life

1984Gu19: 32Al from Ir(p,X) E=10 GeV

1995ReZZ (also 2008ReZZ): measured delayed neutrons, isotopic T1/2

1997IwZX: 64Ni,181Ta(48Ca,X) E=70 MeV/nucleon at RIKEN, measured isomer half-life

2007Ka18, 2005Ue01 (also 2007Ue02): E(40Ar)=95 MeV beam produced using RIKEN accelerator. Spin polarized beam of 32Al obtained by fragmentation of 95-MeV 40Ar beam and using RIPS separator. Static quadrupole moment and magnetic moment of 32Al g.s. determined by β-NMR method. Also 2008KaZQ, 2007Ka68, 2007TaZJ from the same group. 2008KaZQ and 2007TaZJ also report isomer T1/2

2006Kh08: Cross section measurement in Si(32Al,X) E=30-65 MeV/nucleon, deduced ’reduced’ strong absorption radius=1.23 fm2 3. The 32Al beam obtained from fragmentation of 48Ca beam with 181Ta target at GANIL facility.

1999Ai02: Cross section measurement in Si(32Al,X) E=38-80 MeV/ nucleon at NSCL facility. Deduced strong absorption radius

2006Ro34: 2H(40S,X) E=99.3 MeV/nucleon, measured production σ

2007No13: 9Be(40Ar,X) E=100 MeV/nucleon, measured production σ

Structure calculations:

2020Fo04: calculated level energies, J, π

2018Bo14: calculated 0+ and 0- excited states

2017Sa48: calculated nuclear moments

1994Po05: calculated levels, quadrupole moments, transition strenghts

Q-value: S(2n)=11378 7, S(2p)=34152 9, Q(β-n)=3778 7 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0ABCDE 1+ 32.3 ms 4 
% β- = 100
% β-n = 0.7 5
     
   734.8 4 ABCDE (2+)      734.8 4 
   100

     0
1+
   956.7 5 ABCDE (4+) 186.9 ns 7 
% IT = 100
   221.9 3 
   100
[E2]
   734.8
(2+)
  1178.2 6 ABC E (4-)      221.4 5 
   100

   956.7
(4+)
  1743.3 7 ?A C        565
   787
  1743?
    67 11 
   100 11 
  ≤310



  1178.2
   956.7
     0
(4-)
(4+)
1+
  2765.2 7 ?A     1+     2030
  2765.3 9 
     6.0 13 
   100.0 22 


   734.8
     0
(2+)
1+
  3202.0 8 A     1+     2466.9 12 
  3202
   100 10 
    49 6 


   734.8
     0
(2+)
1+

E(level): From a least-squares fit to γ-ray energies, assuming ΔEγ=1 keV where not given

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     01+ 32.3 ms 4 
% β- = 100
% β-n = 0.7 5
μ=+1.953 2 (2006Hi18,2019StZV), Q=+0.0255 3 (2018Xu05,2021StZZ)
Mean square strong absorption radius=1.23 fm2 3 (2006Kh08) in Si(32Al,X) reaction at E=50.18 and 57.42 MeV/nucleon, also measured energy- integrated cross sections.
E(level): Mean square strong absorption radius=1.23 fm2 3 (2006Kh08) in Si(32Al,X) reaction at E=50.18 and 57.42 MeV/nucleon, also measured energy- integrated cross sections.
Jπ(level): Allowed β decay (log ft=4.1-4.4) from 0+.
   734.8(2+)   Jπ(level): Shell-model predictions (2008Hi05,2004Gr08,1997Fo01), although, the ordering of the 2+ and 4+ is reversed in calculations in the sd shell space.
   956.7(4+) 186.9 ns 7 
% IT = 100
Jπ(level): Shell-model predictions (2008Hi05,2004Gr08,1997Fo01), although, the ordering of the 2+ and 4+ is reversed in calculations in the sd shell space.
  1178.2(4-)   Jπ(level): Shell-model predictions (2008Hi05,2004Gr08,1997Fo01), although, the ordering of the 2+ and 4+ is reversed in calculations in the sd shell space.
  1743.3   XREF: α(?).
  2765.21+   Jπ(level): Allowed β decay (log ft=4.1-4.4) from 0+.
  3202.01+   Jπ(level): Allowed β decay (log ft=4.1-4.4) from 0+.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   734.8   734.8E(γ): weighted average of 735.5 12 from 32Mg β- decay, 735.5 6 from (32Al,32Al’γ), 734.1 3 from (36S,Xγ), and 735.2 3 from (37Cl,Xγ)
   956.7   221.9E(γ): weighted average of 221.6 3 from (36S,xγ) and 222.2 3 from (37Cl,xγ). See comment for 221.4γ from 1178 level
  1178.2   221.4E(γ): from (37Cl,xγ). 221.9γ from 957 level and 221.4γ from 1178 level are unresolved in 32Mg β- decay and (32Al,32Al’γ)

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