ADOPTED LEVELS, GAMMAS for 215Ac

Authors: A.K. Jain, S. Singh, B. Singh, N. Kaur, S. Lakshmai |  Citation: Nucl. Data Sheets 114, 2023 (2013) |  Cutoff date: 23-SEP-2013 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-4891 keV 15S(n)= 8485 keV 20S(p)= 1351 keV 13Q(α)= 7746 keV 3
Reference: 2012WA38

References:
  A  219Pa α decay (53 NS)  B  204Pb(15N,4nγ)

General Comments:

215Ac evaluated by α.K. Jain, S. Singh, B. Singh, n. Kaur, S. Lakshami, B. Maheshwari

States in 215Ac have been interpreted in terms of the shell model configurations h9/2, f7/2, and i13/2 available for the seven protons beyond closed shell (Z=82) (1983De08).

2003Ca21: large-scale shell model calculations were performed for 215Ac employing the computer code NATHAN with using modified Kuo-Herling interaction. Additional low-lying levels are predicted in these calculations which have not been observed experimentally

2013Ba29: measured experimental isomer production ratio in 9Be(238U,X) reaction at E=1 GeV/nucleon (2013Ba29) using the FRS, RISING gamma detector array, and tof arrangement at GSI facility.

Q-value: S(2n)=16270 50, S(2p)=4994 13 (2012Wa38)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
       0.0AB 9/2- 0.17 s 1 
% α = 99.91 2
% ε = 0.09 2
     
    1317.0 5  B (13/2-)     1317.0 5 
  100
(E2)
       0.0
9/2-
    1621.0 7  B (17/2-) 30 ns 10     304.0 5 
  100
(E2)
    1317.0
(13/2-)
    1796.0 9  B (21/2-) 185 ns 30     175.0 5 
  100
(E2)
    1621.0
(17/2-)
    1796.0+X B (23/2-)        X
 

    1796.0
(21/2-)
  2438+X B (29/2+) 335 ns 10     642.0 5 
  100
(E3)
    1796.0+X
(23/2-)

E(level): From γ-ray energies

Jπ(level): Assignments are based on γ(θ) data, the analogy with the corresponding levels in the n=126 isotones 211At and 213Fr, and also on the agreement of experimental g-factors with shell-model predictions (i.e. constant values for h9/2 states).

T1/2(level): From γ(t) in 204Pb(15N,4nγ)

M(γ): From γ(θ), and comparison with the corresponding transitions in n=126 isotones 211At and 213Fr. All multipolarities are assumed as stretched.

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
    1317.0 (13/2-)     1317.0 5 (E2)0.00567α=0.00567, α(K)=0.00446 7, α(L)=0.000895 13, α(M)=0.000217 3, α(N)=5.74×10-5 8, α(O)=1.321E-5 19, α(P)=2.39E-6 4, α(Q)=1.86E-7 3
    1621.0 (17/2-) 30 ns 10     304.0 5 (E2)0.1538B(E2)(W.u.)=0.08 3, α=0.1538, α(K)=0.0700 10, α(L)=0.0618 10, α(M)=0.0165 3, α(N)=0.00438 7, α(O)=0.000970 15, α(P)=0.0001585 25, α(Q)=3.59E-6 6
    1796.0 (21/2-) 185 ns 30     175.0 5 (E2)1.021B(E2)(W.u.)=0.119 20, α=1.021 19, α(K)=0.202 3, α(L)=0.601 12, α(M)=0.164 3, α(N)=0.0435 9, α(O)=0.00953 18, α(P)=0.00151 3, α(Q)=1.397E-5 23
  2438+X (29/2+) 335 ns 10     642.0 5 (E3)0.0702B(E3)(W.u.)=27.4 9, α=0.0702, α(K)=0.0389 6, α(L)=0.0231 4, α(M)=0.00613 9, α(N)=0.001637 24, α(O)=0.000367 6, α(P)=6.23E-5 9, α(Q)=2.43E-6 4

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    1317.0(13/2-)   Configuration=π1h9/27.
    1621.0(17/2-) 30 ns 10  μ=7.82 16 (1983De08,1989Ra17)
Configuration=π1h9/27.
    1796.0(21/2-) 185 ns 30  μ=9.66 20 (1983De08,1989Ra17)
Configuration=π1h9/27.
E(level): Measured isomer yield ratio: Rexp=20 4 for 1796, 21/2- level and 20 5 for 2438+x, (29/2+) level (2013Ba29) in 9Be(238U,X) reaction at 1 GeV/nucleon, where Rexp=Y/(Nimp(fragment)γ), Nimp is number of implanted ions, Y is the isomeric yield, F and γ are correction factors for in-flight isomer decay losses and the finite detection time of the γ radiation, respectively. Comparison of measured yield ratios with theoretical values calculated by using ABRABLA Monte-Carlo code.
    1796.0+X(23/2-)   Configuration=π1h9/26~#π2f7/21.
  2438+X(29/2+) 335 ns 10  μ=15.13 30 (1983De08,1989Ra17)
Configuration=π1h9/26~#π1i13/21.
E(level): Measured isomer yield ratio: Rexp=20 4 for 1796, 21/2- level and 20 5 for 2438+x, (29/2+) level (2013Ba29) in 9Be(238U,X) reaction at 1 GeV/nucleon, where Rexp=Y/(Nimp(fragment)γ), Nimp is number of implanted ions, Y is the isomeric yield, F and γ are correction factors for in-flight isomer decay losses and the finite detection time of the γ radiation, respectively. Comparison of measured yield ratios with theoretical values calculated by using ABRABLA Monte-Carlo code.

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Additional Gamma Comments:

E(level)E(gamma)Comments
    1796.0+X       XE(γ): x=50 50 (1983De08)

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