ADOPTED LEVELS, GAMMAS for 251No
Authors: E. Browne, J. K. Tuli | Citation: Nucl. Data Sheets 114, 1041 (2013) | Cutoff date: 1-Jan-2012
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-4878 keV SY | S(n)= 6784 keV SY | S(p)= 3070 keV SY | Q(α)= 8752 keV 4 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 255Rf α decay (1.68 S) | B | 206Pb(48Ca,3nγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | (7/2+) | 0.80 s 1 % ε = ? % α = 91 +9-22 % SF < 0.3 | |||||
| 60.7 7 | AB | (9/2+) | 60.7S | | 0.0 | (7/2+) | ||
| 106 6 | B | (1/2+) | 1.02 s 3 % α ≈ 100 | |||||
| 203.6 2 | AB | (9/2-) | 143.3 2 203.6 2 | 100 12 96 12 | (E1) E1 | 60.7 0.0 | (9/2+) (7/2+) | |
| 917.2 6 ? | B | (7/2+) | 713.6 5 ? | | 203.6 | (9/2-) | ||
| 1699.7 8 ? | B | 782.5 6 ? | | 917.2 | (7/2+) | |||
| 1699.7+X? | B | ≈ 2 µs | X? | | 1699.7 | |||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - 7/2[624] band | |||||||
| 0.0 | (7/2+) | 0.80 s 1 % ε = ? % α = 91 +9-22 % SF < 0.3 | |||||
| 60.7 7 | (9/2+) | 60.7S | | 0.0 | (7/2+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 203.6 | (9/2-) | 143.3 2 | (E1) | 0.0669 | α=0.0669, α(L)=0.0499 8, α(M)=0.01248 18, α(N)=0.00348 5, α(O)=0.000905 13, α(P)=0.0001546 23, α(Q)=5.14×10-6 8, α(N+)=0.00455 7 | |
| (9/2-) | 203.6 2 | E1 | 0.1143 | α=0.1143, α(K)=0.0857 13, α(L)=0.0213 3, α(M)=0.00530 8, α(N)=0.001482 21, α(O)=0.000388 6, α(P)=6.84×10-5 10, α(Q)=2.52E-6 4, α(N+)=0.00194 3 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (7/2+) | 0.80 s 1 % ε = ? % α = 91 +9-22 % SF < 0.3 | %α=91 +9-22, %SF<0.3 (2001He35), %ε+β+ is expected to be small. %α is from total number of 255Rf α decays and the number of α-α correlations in α-decay chain: 255Rf - 251No- 247Fm. Others: only α decay observed (1967Gh01). Calculated T1/2: T1/2(ε+β+)≈6 s, T1/2(α)≈19 s (1997Mo25); T1/2(α)≈0.6 s (1990Ha26); T1/2(SF)≈0.01 s (1985Lo17); T1/2(SF)|>10 s (2000Ho27, evaluation). E(level): 7/2[624] band. |
| 60.7 | (9/2+) | E(level): 7/2[624] band. | |
| 106 | (1/2+) | 1.02 s 3 % α ≈ 100 | Isomer produced by 206Pb(48Ca,3n), E=4.80 MeV/α (2006He27,2004He28). Reaction products were separated from the primary beam by the SHIP velocity filter and implanted into a position-sensitive 16-strip PIPS detector. E(level): Isomer produced by 206Pb(48Ca,3n), E=4.80 MeV/α (2006He27,2004He28). Reaction products were separated from the primary beam by the SHIP velocity filter and implanted into a position-sensitive 16-strip PIPS detector. |
| 203.6 | (9/2-) | Possible configuration=9/2[734] (2006He27). | |
| 917.2 | (7/2+) | Possible configuration=7/2[613] (2006He27). |
| E(level) | E(gamma) | Comments |
| 203.6 | 143.3 | M(γ): from α(L)exp+α(M)exp<0.25 (2006He27) in 255Rf α decay | 203.6 | M(γ): from α(K)exp<0.088, α(L)exp+α(M)exp<0.1 (2006He27) in 255Rf α decay |
| 917.2 | 713.6 | E(γ): The ordering of the 782.5-713.6 cascade is not known. |
| 1699.7 | 782.5 | E(γ): The ordering of the 782.5-713.6 cascade is not known. |
| 1699.7+X | X | E(γ): expected to be a highly-converted transition |
Favored α decay calculated: 1993Bu09
Fission barrier, calculations: 1985Cw01, 1974Ba87, 1973Ba19
Fission half-life, calculations: 1978Po09
Ground state properties, calculations: 1997Mo25, 1995Mo29
Level energies calculated: 2011Ad15, 2011Ha06, 2010Ad17, 2006Sh19, 2005Pa73.
Calculated half-life: 2012Po01, 2011He12, 2010Si27, 2009Do22, 2009Sa25, 2008Do12, 2008Ro06, 2005Zh24.
Cross section calculations: 2006Fe05, 2005Zu02
Cross sections measured: 2003Be18, 2001Og08
1994Cw02 calculated the following single-particle levels: g.s., 7/2[624]; 50, 9/2[734]; 110, 5/2[622]; 440, 1/2[633]; 520, 7/2[743]. See also 2006Sh19 and 2005Pa73.
Assignment (production and identification of 251No):
1967Gh01: 244Cm(12C,5n) excitation function, half-life
2006He27, 2004He28, 2001He35: 251No isotope produced in 206Pb(48Ca,3n) reaction at E=4.80 MeV/nucleon; and from α decay of 255Rf. Reaction products were separated from the primary beam by the SHIP velocity filter and implanted into a position-sensitive 16-strip PIPS detector.
Q-value: Δ(Q(β-))=319, Δ(S(n))=231, Δ(S(p))=322 (syst,2012Wa38)
Q-value: Q(εp)=1488 115 (syst,2012Wa38)
Q-value: Q(α). Other: 8749 16 (2006He27)