ADOPTED LEVELS, GAMMAS for 93Pd

Author: Coral M. Baglin |  Citation: Nucl. Data Sheets 112, 1163 (2011) |  Cutoff date: 15-Dec-2010 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1.29×104 keV SYS(n)= 1.21×104 keV SYS(p)= 3.4×103 keV SYQ(α)= -3.5×103 keV SY
Reference: 2012WA38

References:
  A  94Ag p decay (0.39 S)  B  40Ca(58Ni,αnγ)
  C  58Ni(40Ca,αnγ) 

General Comments:

Production:

2000Sc31: 58Ni(40Ca,αn), E=188 MeV; enriched 58Ni target, online mass separation; Si E-ΔE telescope, plastic scin and 12 Ge detectors; measured direct and ε-delayed protons, Eγ, Iγ, γβ+ coin and γγβ+ coin; shell-model calculations.

2000WeZZ: 112Sn bombardment of Be, E(112Sn)=112 GeV; fragment mass separation, time of flight for identification; four double-sided Si strip detectors, Si β detectors, segmented-clover Ge γ detector; measured T1/2.

1994He28: Ni+106Cd, E(106Cd)=60 MeV/α; 93Pd separated and identified using projectile fragment separator with 150 ns flight path; data also reported by 1995He39 and 1995Mo26.

Others: 1995Le08 (63 MeV/α 112Sn on Ni); 1976FaZW (60Ni(40Ca,α3n), E=147 MeV).

The adopted level scheme is based on the schemes deduced in 94Ag p decay and in 58Ni(40Ca,αnγ). The scheme proposed in 40Ca(58Ni,αnγ) is less extensive, but includes all but the 516γ in the cascade to the g.s. from the 7280 level; however, it reverses the order of the 984γ-1096γ cascade and reorders the 349γ-167γ-275γ cascade.

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

Q-value: Q(β-), S(n), S(p), Q(α): from 2009AuZZ (cf. -12920 720 (syst.), 12270 640 (syst.), 3630 570, -2610 640 (syst.), respectively, from 2003Au03).

Q-value: ΔQ-=720, ΔS(n)=640, ΔS(p)=400, ΔQ(α)=640 (2009AuZZ).

Q-value: Q(ε-p)=7570 400 from systematics (2009AuZZ) (cf. 7420 590 from systematics (2003Au03)).

Q-value: 2008Ka30 deduce a mass excess of -59440 160 for 93Pd (cf. -59700 400 from systematics in 2003Au03) based on an interpolation of S(2p) values for n=47 isotones and they estimate S(p)=3730 160 and S(2p)=5780 160. 2009AuZZ adopt mass excess of -59440 400 and S(p)=3730 400.










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABC (9/2+) 1.00 s 9 
% ε = 100
% εp = ?
     
   983.5 3 ABC (13/2+)      983.5 3 
  100
Q
     0.0
(9/2+)
  1870.8 5 A C (15/2+)      887.3 5 
  100
(D)
   983.5
(13/2+)
  2079.3 5 ABC (17/2+)      208.4 3 
  1095.7 5 
   12.8 23 
  100 10 

Q
  1870.8
   983.5
(15/2+)
(13/2+)
  2232.2 5 A C (17/2+)      152.8 3 
   361.5 3 
   25 6 
  100 13 

(D)
  2079.3
  1870.8
(17/2+)
(15/2+)
  2428.5 6 ABC (19/2+)      196.3 3 
   349.3 3 
   52 17 
  100 5 
(D)
(D)
  2232.2
  2079.3
(17/2+)
(17/2+)
  2595.5 6 ABC (21/2+)      167.0 3 
   516.3 5 
  100 7 
   58 16 
D
(Q)
  2428.5
  2079.3
(19/2+)
(17/2+)
  2870.9 7 ABC (25/2+)      275.4 3 
  100

  2595.5
(21/2+)
  3386.0 11 ?A C (25/2-,27/2-)      514.5 10 ?
  100
(D)
  2870.9
(25/2+)
  3735.1 11 ?A C (29/2-,31/2-)      349.0 5 
  100

  3386.0
(25/2-,27/2-)
  3863.2 8 ABC (29/2+)      992.4 4 
  100
Q
  2870.9
(25/2+)
  4138.7 11 ?A   (29/2-,31/2-)      276?
   403
 
 
[E1]

  3863.2
  3735.1
(29/2+)
(29/2-,31/2-)
  4752.7 15 ?A   (33/2-,35/2-)      614
  100

  4138.7
(29/2-,31/2-)
  4995.6 9 ABC (33/2+)     1132.3 5 
  100
Q
  3863.2
(29/2+)
  5649.0 10  BC (37/2+)      653.4 4 
  100
Q
  4995.6
(33/2+)
  6994.9 11   C (39/2+)     1346.0 5 
  100

  5649.0
(37/2+)
  7280.8 12  BC (41/2+)      286.0 5 
  1631.6 10 
   50 20 
  100 20 

Q
  6994.9
  5649.0
(39/2+)
(37/2+)
  7662.9 12   C (45/2+)      382.1 4 
  100

  7280.8
(41/2+)

E(level): From least-squares fit to adopted Eγ, assigning 1 keV uncertainty to Eγ data for which the authors did not state an uncertainty.

Jπ(level): From 58Ni(40Ca,αnγ), except as noted, based on measured DCO ratios and on comparison of deduced structure with that for isotones 87Zr, 89Mo and 91Ru and with predictions from shell-model calculations performed in the restricted model space of g9/2 and p1/2 for proton and neutron holes (2004Ru02). These values assume Jπ(g.s.)=9/2+.

M(γ): From γ asymmetry ratio in 40Ca(58Ni,αnγ), except as noted.

Back to top

Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - π=(+) ΔJ=2 yrast SEQUENCE.
     0.0 (9/2+) 1.00 s 9 
% ε = 100
% εp = ?
     
   983.5 3  (13/2+)      983.5 3 
  100
Q
     0.0
(9/2+)
  2079.3 5  (17/2+)      208.4 3 
  1095.7 5 
   12.8 23 
  100 10 

Q
  1870.8
   983.5
(15/2+)
(13/2+)
  2595.5 6  (21/2+)      167.0 3 
   516.3 5 
  100 7 
   58 16 
D
(Q)
  2428.5
  2079.3
(19/2+)
(17/2+)
  2870.9 7  (25/2+)      275.4 3 
  100

  2595.5
(21/2+)
  3863.2 8  (29/2+)      992.4 4 
  100
Q
  2870.9
(25/2+)
  4995.6 9  (33/2+)     1132.3 5 
  100
Q
  3863.2
(29/2+)
  5649.0 10  (37/2+)      653.4 4 
  100
Q
  4995.6
(33/2+)
  7280.8 12  (41/2+)      286.0 5 
  1631.6 10 
   50 20 
  100 20 

Q
  6994.9
  5649.0
(39/2+)
(37/2+)
  7662.9 12  (45/2+)      382.1 4 
  100

  7280.8
(41/2+)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - π=(-) sequence.
  3386.0 11  (25/2-,27/2-)        
  3735.1 11  (29/2-,31/2-)      349.0 5 
  100

  3386.0
(25/2-,27/2-)
  4138.7 11  (29/2-,31/2-)      276?
   403
 
 
[E1]

  3863.2
  3735.1
(29/2+)
(29/2-,31/2-)
  4752.7 15  (33/2-,35/2-)      614
  100

  4138.7
(29/2-,31/2-)

Back to top

Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
  4138.7 (29/2-,31/2-)      276[E1]0.00868α=0.00868 13, α(K)=0.00759 11, α(L)=0.000889 13, α(M)=0.0001662 24, α(N)=2.78×10-5 4, α(N+)=2.78E-5

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(9/2+) 1.00 s 9 
% ε = 100
% εp = ?
E(level): π=(+) ΔJ=2 yrast SEQUENCE.
T1/2(level): Unweighted average of 0.7 s +2-1 from ε-delayed proton decay and 1.0 s 3 from γ(t) for ε-delayed 240γ (2000Sc31), 1.0 s 2 (2001Ki13), 1.3 s 2 (2001Xu05 and 2005Xu04) and 1.0 s +3-2; supported by T1/2=0.9 s 6 and 0.9 s 4, respectively, for 382γ and γ|+ from 2000Sc31. The evaluator’s assignment of this T1/2 to the 93Pd g.s. is consistent with shell-model T1/2 predictions by 1997He24 (1.4 s). Note that T1/2=9.3 s +25-17, tentatively assigned to 93Pd by 2000WeZZ, appears to have been erroneous (see 2007WeZX). An E≈660-keV 1/2- state is predicted also (2000Sc31) and this possibly may Be isomeric. Other T1/2: 1976FaZW report a 60 s 20 proton activity in coincidence with x rays that suggest a 93Pd precursor; this tentative assignment to 93Pd remains unconfirmed and is probably not correct.
   983.5(13/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  2079.3(17/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  2595.5(21/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  2870.9(25/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  3386.0(25/2-,27/2-)   E(level): π=(-) sequence.
Jπ(level): Tentative π=- level sequence built on (25/2-,27/2-) 3386 level; proposed because observed proton branches with similar strength to 4994 and 4751 levels in 94Ag p decay make it unlikely that the latter levels belong in the even-parity yrast sequence (2005Mu15).
  3735.1(29/2-,31/2-)   E(level): π=(-) sequence.
Jπ(level): Tentative π=- level sequence built on (25/2-,27/2-) 3386 level; proposed because observed proton branches with similar strength to 4994 and 4751 levels in 94Ag p decay make it unlikely that the latter levels belong in the even-parity yrast sequence (2005Mu15).
  3863.2(29/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  4138.7(29/2-,31/2-)   E(level): π=(-) sequence.
Jπ(level): Tentative π=- level sequence built on (25/2-,27/2-) 3386 level; proposed because observed proton branches with similar strength to 4994 and 4751 levels in 94Ag p decay make it unlikely that the latter levels belong in the even-parity yrast sequence (2005Mu15).
  4752.7(33/2-,35/2-)   E(level): π=(-) sequence.
Jπ(level): Tentative π=- level sequence built on (25/2-,27/2-) 3386 level; proposed because observed proton branches with similar strength to 4994 and 4751 levels in 94Ag p decay make it unlikely that the latter levels belong in the even-parity yrast sequence (2005Mu15).
  4995.6(33/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  5649.0(37/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  7280.8(41/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.
  7662.9(45/2+)   E(level): π=(+) ΔJ=2 yrast SEQUENCE.

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
   983.5   983.5M(γ): From DCO ratio in 58Ni(40Ca,αnγ).
  1870.8   887.3M(γ): From DCO ratio in 58Ni(40Ca,αnγ).
  2232.2   361.5M(γ): From DCO ratio in 58Ni(40Ca,αnγ).
  2428.5   196.3I(γ): I(196γ)/I(349γ)=0.52 17 from p-γ spectra gated on 1010-keV protons in 94Ag p decay. Other data: 1.0 3 from p-γ spectra gated on 790-keV protons in 94Ag p decay; 0.18 4 from (40Ca,αnγ).
M(γ): From DCO ratio in 58Ni(40Ca,αnγ).
   349.3M(γ): From DCO ratio in 58Ni(40Ca,αnγ).
  2595.5   516.3M(γ): From DCO ratio in 58Ni(40Ca,αnγ).
  2870.9   275.4M(γ): DCO in (40Ca,αnγ) suggests Q or D+Q but γ asymmetry in (58Ni,αnγ) is consistent with pure d. Possibly γ is a doublet, as suggested in 94Ag p decay (0.39 s).
  3386.0   514.5M(γ): possibly E1; connects π=(+) and π=(-) level sequences.. From DCO ratio in 58Ni(40Ca,αnγ).
  3735.1   349.0M(γ): (d) for doublet in 40Ca(58Ni,αnγ).
  3863.2   992.4E(γ): from (58Ni,αnγ). Other Eγ: 991.2 7 from (40Ca,αnγ).
  4138.7   276E(γ): from 94Ag p decay (0.39 s).
M(γ): possibly E1; connects π=(+) and π=(-) level sequences. However, see comment on 275γ from 2871 level.
   403E(γ): from 94Ag p decay (0.39 s).
  4752.7   614E(γ): from 94Ag p decay (0.39 s).

Back to top