ADOPTED LEVELS, GAMMAS for 222Rn

Authors: Balraj Singh, M.S. Basunia, Jun Chen Et Al., |  Citation: Nucl. Data Sheets 192, 315 (2023) |  Cutoff date: 25-Sep-2023 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-6 keV 8S(n)= 6171 keV 6S(p)= 7700 keV 14Q(α)= 5590.4 keV 3
Reference: 2021WA16

References:
  A  226Ra α decay (1603 Y)  B  232Th(136Xe,xγ)
  C  Coulomb Excitation 

General Comments:

Dataset by Balraj Singh, S. Basunia, and IAEA-ICTP workshop participants: B.M.S. Amro, S. Basu, S. Das, α. Karmakar, and S.S. Nayak

222Rn is a naturally occuring radioactive isotope, emitted from the α decay of 226Ra, a long-lived activity produced in the decay chain of 238U, first identified by 1899Cu01, just three years after the discovery of radioactivity, followed by the first measurement of half-life of 222Rn decay by 1902Cu01.

Mass measurement: 2010Li02: Schottky mass spectrometry.

Theoretical nuclear structure calculations:

2021Va08: calculated levels, Jπ, yrast positive- and negative-parity states, B(E1), B(E2), B(E3), B(M1), magnetic dipole and electric quadrupole moments using the spdf-IBM-2 interacting boson model.

2020Ca18: calculated deformation parameters β2, β3, octupole deformation energies, proton quadrupole Q20 and octupole Q30 moments for octupole-deformed nuclei using Skyrme energy density functional, and covariant energy density functional models.

2019Zh50: calculated empirical proton-neutron interaction, B(E2), B(E3), binding energy, total energy in (β23) plane, neutron and proton single-particle levels using the covariant density functional theory and the quadrupole-octupole collective Hamiltonian.

2018Yo12: calculated E(first 4+)/E(first 2+) ratio, energy of the first 3- state using shell model with one-octupole-phonon representing collective octupole vibration across the magic core.

2017Xi15: calculated levels, Jπ, B(E1), B(E2), B(E3), electric dipole moment, deformation energy surface in (β23) plane, reflection-asymmetric states using microscopic quadrupole-octupole collective Hamiltonian (QOCH), based on based on relativistic energy density functional.

2014De43, 2013De12: calculated energy levels, Jπ, deformation parameters, B(E2), T1/2 using coherent state model (CSM).

2013Ro30: calculated level energies of 1- states, B(E1), B(E3) using two-dimensional generator coordinate method (GCM) for quadrupole-octupole coupling with Gogny forces.

2005Za02, 2001Za04: calculated levels, Jπ, transition rates, octupole excitations using interacting boson model.

1998Ra05: calculated high-spin levels, Jπ, Kπ=0- band using phenomenological model.

1994Li05: calculated total energy surface vs α20, α32 deformations, fourfold degenerate levels using the results of realistic total nuclear energy calculations.

1987Ro08: calculated single-particle states, pairing energies, octupole deformation, dipole vs octupole moments, B(E1)/B(E2) using constrained HF plus BCS method.

1983Ro14: calculated potential equilibrium deformation, deformation energies, static quadrupole and hexadecapole moments using density-dependent shell correction method.

1982Le19: calculated potential energy minima, octupole separation energy, and intrinsic reflection symmetry breaking using deformed shell-model.

1981Gy03: calculated potential energy, quadrupole and octupole equilibrium deformations using macroscopic-microscopic method.

1981Pe09: analyzed levels, Jπ, strong Coriolis coupling effects for rotational bands based on one-phonon octupole vibrational states.

1980Sh07: analyzed levels, Jπ, inverse moments of inertia; deduced structural relation of Kπ=0+ and Kπ=0- bands.

Other theoretical calculations: 14 primary references for structure, and 76 primary references for decay characteristics are in the NSR database, and listed in this dataset as ’document’ records.

Levels: The Kπ=0+ g.s. band and the Kπ=0- band at 600.66 keV have been interpreted as octupole parity-doublet bands. However, 2022Sp01 and 2020Bu20 in their Coulomb excitation study do not support stable octupole deformation in the ground state of 222Rn

Gammas: B(E2)(W.u.) and B(E1)(W.u.) values are from Coulomb excitation, deduced by evaluators from measured transition matrix elements, with exceptions noted.

Q-value: S(2n)=10382.7 19, S(2p)=13469 18 (2021Wa16).










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABC 0+ 3.8222 d 9 
% α = 100
     
   186.211 13 ABC 2+ 0.32 ns 2    186.211 13 
   100
E2
     0.0
0+
   448.48 6 ABC 4+ 52.5 ps +44-23    262.27 5 
   100
[E2]
   186.211
2+
   600.74 4 ABC 1- 0.7 ps +11-5    414.60 5 
  600.66 5 
    60
   100
[E1]
[E1]
   186.211
     0.0
2+
0+
   635.57 9 ABC 3- ≈ 0.4 ns    34.81 16 S
  187.10 20 ?
  449.37 10 
    ≈0.032
 
  ≈100
[E2]
[E1]
[E1]
   600.74
   448.48
   186.211
1-
4+
2+
   768.08 21  BC (6+) 15.9 ps +18-11    319.6 2 
   100
[E2]
   448.48
4+
   797.4 5  BC (5-)     163.0 5 ?
  348.9 5 
 
 
[E2]

   635.57
   448.48
3-
4+
   867.0 7   C (0+)     266 2 
  681
 
 
[E1]
[E2]
   600.74
   186.211
1-
2+
   867.1 7   C (2+)     681
  867
 
 
[E2+M1]
[E2]
   186.211
     0.0
2+
0+
   959.2 10   C (3+)     773
 
[E2+M1]
   186.211
2+
  1048.7 5  BC (7-)     251.4 5 ?
  280.6 5 
 
   100 28 
[E2]
[E1]
   797.4
   768.08
(5-)
(6+)
  1111.5 10   C (4+)     663
 
[E2+M1]
   448.48
4+
  1127.7 3  BC (8+) 7.3 ps +11-16    359.6 2 
   100
[E2]
   768.08
(6+)
  1356.5 5  BC (9-) 7 ps +9-5    228.8 5 
  307.7 5 
    74 42 
   100 42 
[E1]
[E2]
  1127.7
  1048.7
(8+)
(7-)
  1512.5 4  BC (10+) 7.8 ps +51-12    384.9 2 
   100
[E2]
  1127.7
(8+)
  1707.8 5  B  (11-)     195.4 5 
  351.2 5 
    48 31 
   100 31 
[E1]
[E2]
  1512.5
  1356.5
(10+)
(9-)
  1912.9 6 ? B  (12+)     400.4 5 ?
 

  1512.5
(10+)
  2088.7 7  B  (13-)     175.6 5 ?
  380.9 5 
 
   100 53 

[E2]
  1912.9
  1707.8
(12+)
(11-)
  2316.7 8 ? B  (14+)     403.8 5 ?
 

  1912.9
(12+)
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
  2485.0 9 ? B  (15-)     396.3 5 ?
 

  2088.7
(13-)
  2727.2 10 ? B  (16+)     410.5 5 ?
 

  2316.7
(14+)
  2881.6 10 ? B  (17-)     396.6 5 ?
 

  2485.0
(15-)
  3285.6 12 ? B  (19-)     404.0 5 ?
 

  2881.6
(17-)
  3695.8 13 ? B  (21-)     410.2 5 ?
 

  3285.6
(19-)

E(level): From least-squares fit to Eγ data

Jπ(level): From band assignments in 232Th(136Xe,Xγ) for levels above 635 keV

T1/2(level): For levels above 186 keV, half-lives deduced by evaluators from E2 matrix elements measured (2022Sp01) in Coulomb excitation

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Kπ=0+ g.s. band.
     0.0 0+ 3.8222 d 9 
% α = 100
     
   186.211 13  2+ 0.32 ns 2    186.211 13 
   100
E2
     0.0
0+
   448.48 6  4+ 52.5 ps +44-23    262.27 5 
   100
[E2]
   186.211
2+
   768.08 21  (6+) 15.9 ps +18-11    319.6 2 
   100
[E2]
   448.48
4+
  1127.7 3  (8+) 7.3 ps +11-16    359.6 2 
   100
[E2]
   768.08
(6+)
  1512.5 4  (10+) 7.8 ps +51-12    384.9 2 
   100
[E2]
  1127.7
(8+)
  1912.9 6  (12+)     400.4 5 ?
 

  1512.5
(10+)
  2316.7 8  (14+)     403.8 5 ?
 

  1912.9
(12+)
  2727.2 10  (16+)     410.5 5 ?
 

  2316.7
(14+)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Kπ=0- octupole vibrational band.
   600.74 4  1- 0.7 ps +11-5       
   635.57 9  3- ≈ 0.4 ns    34.81 16 S
  187.10 20 ?
  449.37 10 
    ≈0.032
 
  ≈100
[E2]
[E1]
[E1]
   600.74
   448.48
   186.211
1-
4+
2+
   797.4 5  (5-)     163.0 5 ?
  348.9 5 
 
 
[E2]

   635.57
   448.48
3-
4+
  1048.7 5  (7-)     251.4 5 ?
  280.6 5 
 
   100 28 
[E2]
[E1]
   797.4
   768.08
(5-)
(6+)
  1356.5 5  (9-) 7 ps +9-5    228.8 5 
  307.7 5 
    74 42 
   100 42 
[E1]
[E2]
  1127.7
  1048.7
(8+)
(7-)
  1707.8 5  (11-)     195.4 5 
  351.2 5 
    48 31 
   100 31 
[E1]
[E2]
  1512.5
  1356.5
(10+)
(9-)
  2088.7 7  (13-)     175.6 5 ?
  380.9 5 
 
   100 53 

[E2]
  1912.9
  1707.8
(12+)
(11-)
  2485.0 9  (15-)     396.3 5 ?
 

  2088.7
(13-)
  2881.6 10  (17-)     396.6 5 ?
 

  2485.0
(15-)
  3285.6 12  (19-)     404.0 5 ?
 

  2881.6
(17-)
  3695.8 13  (21-)     410.2 5 ?
 

  3285.6
(19-)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Possible γ band
   867.1 7  (2+)        
   959.2 10  (3+)     773
 
[E2+M1]
   186.211
2+
  1111.5 10  (4+)     663
 
[E2+M1]
   448.48
4+

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
   186.211 2+ 0.32 ns 2    186.211 13 E20.677B(E2)(W.u.)=58 4, α=0.677 9
   448.48 4+ 52.5 ps +44-23    262.27 5 [E2]0.2087B(E2)(W.u.)=90 +4-7, α=0.2087 30
   600.74 1- 0.7 ps +11-5    414.60 5 [E1]0.01628B(E1)(W.u.)=0.0014 +23-9, α=0.01628 23
1- 0.7 ps +11-5    600.66 5 [E1]0.00762B(E1)(W.u.)=7E-4 +21-4, α=0.00762 11
   635.57 3- ≈ 0.4 ns    34.81 16 [E2]1.30×103B(E2)(W.u.)=80 +32-27, α=1.30E3 4
3- ≈ 0.4 ns   187.10 20 [E1]0.1011α=0.1011 14
3- ≈ 0.4 ns   449.37 10 [E1]0.0137B(E1)(W.u.)≈4E-6, α=0.0137 2
   768.08 (6+) 15.9 ps +18-11    319.6 2 [E2]0.1144B(E2)(W.u.)=120 +9-12, α=0.1144 16
   797.4 (5-)     163.0 5 [E2]1.116B(E2)(W.u.)=4.6 +12-17, α=1.116 21
   867.0 (0+)     266 2 [E1]0.0438B(E1)(W.u.)=1.4E-3 +11-8, α=0.0438 10
(0+)     681[E2]0.0176B(E2)(W.u.)=13 4, α=0.0176 3
   867.1 (2+)     681[E2+M1]0.042B(E2)(W.u.)=6.8 42, α=0.042 25
(2+)     867[E2]0.0107B(E2)(W.u.)=1.5 +4-5, α=0.0107 2
   959.2 (3+)     773[E2+M1]0.031B(E2)(W.u.)=26 +14-17, α=0.031 17
  1048.7 (7-)     251.4 5 [E2]0.240B(E2)(W.u.)=26E1 +12-10, α=0.240 4
(7-)     280.6 5 [E1]0.0387α=0.0387 6
  1111.5 (4+)     663[E2+M1]0.04B(E2)(W.u.)=11.5 +39-45, α=0.04 3
  1127.7 (8+) 7.3 ps +11-16    359.6 2 [E2]0.0819B(E2)(W.u.)=149 +42-19, α=0.0819 12
  1356.5 (9-) 7 ps +9-5    228.8 5 [E1]0.0624α=0.0624 9
(9-) 7 ps +9-5    307.7 5 [E2]0.1279B(E2)(W.u.)=20E1 +19-8, α=0.1279 19
  1512.5 (10+) 7.8 ps +51-12    384.9 2 [E2]0.0680B(E2)(W.u.)=100 +26-39, α=0.0680 10
  1707.8 (11-)     195.4 5 [E1]0.0910α=0.0910 14
(11-)     351.2 5 [E2]0.0874α=0.0874 13
  2088.7 (13-)     380.9 5 [E2]0.0700α=0.0700 10

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 3.8222 d 9 
% α = 100
With Q(β-)=-6 8 (2021Wa16), no β- decay is expected.
E(level): With Q(β-)=-6 8 (2021Wa16), no β- decay is expected. Kπ=0+ g.s. band.
   186.2112+ 0.32 ns 2  μ=+0.92 14 (1970Or02,2020StZV), Q=-1.4 +5-6
E(level): Kπ=0+ g.s. band.
   448.484+ 52.5 ps +44-23  (α)(262γ)(θ) data of 1989Po03 rule out J of 0, 1, 2 and 3; population of natural-parity state in α decay from 0+ parent.
E(level): (α)(262γ)(θ) data of 1989Po03 rule out J of 0, 1, 2 and 3; population of natural-parity state in α decay from 0+ parent. Kπ=0+ g.s. band.
   600.741- 0.7 ps +11-5  E(level): Kπ=0- octupole vibrational band.
   635.573- ≈ 0.4 ns (α)(449γ)(θ) data of 1989Po03 rules out 0, 1, 2 and 4; population of natural-parity state in α decay from 0+ parent.
E(level): (α)(449γ)(θ) data of 1989Po03 rules out 0, 1, 2 and 4; population of natural-parity state in α decay from 0+ parent. Kπ=0- octupole vibrational band.
   768.08(6+) 15.9 ps +18-11  E(level): Kπ=0+ g.s. band.
   797.4(5-)   E(level): Kπ=0- octupole vibrational band.
   867.1(2+)   E(level): Possible γ band.
   959.2(3+)   E(level): Possible γ band.
  1048.7(7-)   E(level): Kπ=0- octupole vibrational band.
  1111.5(4+)   E(level): Possible γ band.
  1127.7(8+) 7.3 ps +11-16  E(level): Kπ=0+ g.s. band.
  1356.5(9-) 7 ps +9-5  D0/Q0=0.00191 b1/2 35 (1999Co02).
E(level): D0/Q0=0.00191 b1/2 35 (1999Co02). Kπ=0- octupole vibrational band.
  1512.5(10+) 7.8 ps +51-12  E(level): Kπ=0+ g.s. band.
  1707.8(11-)   Average D0=0.010 eb1/2 2 (1999Co02) for J=9 and 11 states.
E(level): Average D0=0.010 eb1/2 2 (1999Co02) for J=9 and 11 states. Kπ=0- octupole vibrational band.
  1912.9(12+)   E(level): Kπ=0+ g.s. band.
  2088.7(13-)   E(level): Kπ=0- octupole vibrational band.
  2316.7(14+)   E(level): Kπ=0+ g.s. band.
  2485.0(15-)   E(level): Kπ=0- octupole vibrational band.
  2727.2(16+)   E(level): Kπ=0+ g.s. band.
  2881.6(17-)   E(level): Kπ=0- octupole vibrational band.
  3285.6(19-)   E(level): Kπ=0- octupole vibrational band.
  3695.8(21-)   E(level): Kπ=0- octupole vibrational band.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   867.0   681E(γ): Multiply placed
   867.1   681E(γ): Multiply placed

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