ADOPTED LEVELS, GAMMAS for 191Po
Author: V.R. Vanin Et Al. | Citation: Nucl. Data Sheets 108, 2393 (2007) | Cutoff date: 1-Dec-2006
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-8933 keV 18 | S(n)= 8576 keV 16 | S(p)= 1759 keV 24 | Q(α)= 7493 keV 5 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 195Rn α decay (6 MS) | B | 195Rn α decay (5 MS) |
| C | (HI,xnγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | Final Levels | |
| 0.0 | A C | (3/2-) | 22 ms 1 % α = 99.0 10 | |||
| 40 15 | BC | (13/2+) | 93 ms 3 % α = 96 4 | |||
| 301 | C | (17/2+) | 262 | 40 | (13/2+) | |
| 668 | C | (21/2+) | 367 | 301 | (17/2+) | |
| 1132 | C | (25/2+) | 464 | 668 | (21/2+) | |
| 1671? | C | (29/2+) | 539 | 1132 | (25/2+) | |
E(level): The energies of the levels above the (13/2+) isomeric level are obtained from sums of γ-ray energies. No uncertainty estimates are available.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | Final Levels | |||
| Band 1 - Band based on (13/2+) state. | |||||||
| 40 15 | (13/2+) | 93 ms 3 % α = 96 4 | |||||
| 301 | (17/2+) | ||||||
| 668 | (21/2+) | 367 | 301 | (17/2+) | |||
| 1132 | (25/2+) | 464 | 668 | (21/2+) | |||
| 1671 | (29/2+) | 539 | 1132 | (25/2+) | |||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (3/2-) | 22 ms 1 % α = 99.0 10 | This level decays by two main α branches to low-spin (3/2-) states in 187Pb. 2002An19 obtained: E(α)=7334 5 keV, Iα=77.0 25 %, HF=2.9 1, and E(α)=6966 10 keV, Iα=8.0 23 %, HF=1.6 5. Using the value r0(187Pb)=1.526 20 (average of r0(186Pb)=1.54 2 and r0(188Pb)=1.511 8, from 1998Ak04) one can deduce the values HF=4.0 4 and HF=2.3 7, respectively, for those two transitions. Another α branch connects this level to the high spin (13/2+) isomeric state in 187Pb, for which 2002An19 quote E(α)=7336 15 keV, Iα=15 2 %, HF=15 2. α similar recalculation of the hindrance factor for this α ray provides HF=21 4. E(level): This level decays by two main α branches to low-spin (3/2-) states in 187Pb. 2002An19 obtained: E(α)=7334 5 keV, Iα=77.0 25 %, HF=2.9 1, and E(α)=6966 10 keV, Iα=8.0 23 %, HF=1.6 5. Using the value r0(187Pb)=1.526 20 (average of r0(186Pb)=1.54 2 and r0(188Pb)=1.511 8, from 1998Ak04) one can deduce the values HF=4.0 4 and HF=2.3 7, respectively, for those two transitions. Another α branch connects this level to the high spin (13/2+) isomeric state in 187Pb, for which 2002An19 quote E(α)=7336 15 keV, Iα=15 2 %, HF=15 2. α similar recalculation of the hindrance factor for this α ray provides HF=21 4. |
| 40 | (13/2+) | 93 ms 3 % α = 96 4 | This level decays by two main α branches, for which 2002An19 find: E(α)=7376 5 keV, Iα=47.6 15 %, HF≈28 2 to the high-spin (13/2+) isomeric level in 187Pb, and E(α)=6888 5 keV, Iα=38 8 %, HF=0.76 17, to an excited (13/2+) level (2002An19). Using the value r0(187Pb)=1.526 20 (see discussion for g.s. level) the recalculated hindrance factors are HF=39 4 and HF=1.1 3, respectively. E(level): This level decays by two main α branches, for which 2002An19 find: E(α)=7376 5 keV, Iα=47.6 15 %, HF≈28 2 to the high-spin (13/2+) isomeric level in 187Pb, and E(α)=6888 5 keV, Iα=38 8 %, HF=0.76 17, to an excited (13/2+) level (2002An19). Using the value r0(187Pb)=1.526 20 (see discussion for g.s. level) the recalculated hindrance factors are HF=39 4 and HF=1.1 3, respectively. Band based on (13/2+) state. Jπ(level): Jπ sequence on the basis of assumed high-spin band structure built on a (13/2+) state. |
| 301 | (17/2+) | E(level): Band based on (13/2+) state. Jπ(level): Jπ sequence on the basis of assumed high-spin band structure built on a (13/2+) state. | |
| 668 | (21/2+) | E(level): Band based on (13/2+) state. Jπ(level): Jπ sequence on the basis of assumed high-spin band structure built on a (13/2+) state. | |
| 1132 | (25/2+) | E(level): Band based on (13/2+) state. Jπ(level): Jπ sequence on the basis of assumed high-spin band structure built on a (13/2+) state. | |
| 1671 | (29/2+) | E(level): Band based on (13/2+) state. Jπ(level): Jπ sequence on the basis of assumed high-spin band structure built on a (13/2+) state. |
Identification: 100Mo(94Mo,3n) excitation function and systematics of α-particle energies (1993Qu03); 96Mo(96Mo,n) (1997Ba25), 160Dy(36Ar,5n) E=196 MeV (1999An36).
Other references: 1999An10, 2001Hu21, 2001Ju09, 2001Le36, 2001Uu01.
Levels: For extensive discussions regarding the assignment of probable Jπ values, shape coexistence phenomena for the low-lying levels in 191Po, and multiparticle-multihole configurations underlying the level structures, see 2002An19 and references therein.
Levels: Tentative level scheme adopted from 2002An19.
Q-value: Note: Current evaluation has used the following Q record
Q-value: α least-squares adjustment of the α-ray energies determined in 2001Ke06 for the decay to levels in 187Pb, leads to a value of Q(α)=7495 8 keV.