ADOPTED LEVELS, GAMMAS for 216Pb
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 19-FEB-2015
Authors: Balraj Singh and Michael Birch | Citation: ENSDF | Cutoff date: 15-MAY-2011
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=1610 keV SY | S(n)= 5010 keV SY | S(p)= 9720 keV SY | Q(α)= 2300 keV SY | ||
| Reference: 2012WA38 |
| References: | |||
| A | 9Be(238U,xγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | M(γ) | Final Levels | |
| 0 | A | 0+ | > 300 ns % β- = ? | ||||
| 887 1 | A | (2+) | 887 | 0 | 0+ | ||
| 1289 2 | A | (4+) | 402 | 887 | (2+) | ||
| 1459 2 | A | (6+) | % IT = 100 | 170 | [E2] | 1289 | (4+) |
| 1459+X? | A | (8+) | 0.40 µs 4 % IT = 100 | XS | [E2] | 1459 | (6+) |
E(level): From Eγ values, assuming 1 keV uncertainty for each γ ray
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | M(γ) | Final Levels | ||
| Band 1 - Yrast cascade | |||||||
| 0 | 0+ | > 300 ns % β- = ? | |||||
| 887 1 | (2+) | 887 | 0 | 0+ | |||
| 1289 2 | (4+) | 402 | 887 | (2+) | |||
| 1459 2 | (6+) | % IT = 100 | 170 | [E2] | 1289 | (4+) | |
| 1459+X? | (8+) | 0.40 µs 4 % IT = 100 | XS | [E2] | 1459 | (6+) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 1459 | (6+) | % IT = 100 | 170 | [E2] | 0.765 | α=0.765 20 |
| 1459+X | (8+) | 0.40 µs 4 % IT = 100 | X | [E2] | B(E2)(W.u.)=0.36 +3-8 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | > 300 ns % β- = ? | The β- decay is the only decay mode expected. E(level): Yrast cascade. |
| 887 | (2+) | E(level): Yrast cascade. | |
| 1289 | (4+) | E(level): Yrast cascade. | |
| 1459 | (6+) | % IT = 100 | E(level): Yrast cascade. |
| 1459+X | (8+) | 0.40 µs 4 % IT = 100 | E(level): Yrast cascade. |
| E(level) | E(gamma) | Comments |
| 1459+X | X | E(γ): transition to (6+) level not seen in γ-ray spectra, energy is estimated as x=20-90 keV (2012Go19) based on the observed intensity of x rays and that expected from large internal conversion of a low-energy E2 transition |
2010Al24 (also 2009Al32): 216Pb nuclide identified in 9Be(238U,X) reaction with a beam energy of 1 GeV/nucleon produced by the SIS synchrotron at GSI facility. Target=2.5 g/cm2. The fragment residues were analyzed with the high resolving power magnetic spectrometer Fragment separator (FRS). The identification of nuclei was made on the basis of magnetic rigidity, velocity, time-of-flight, energy loss and atomic number of the fragments using two plastic scintillators and two multisampling ionization chambers. The FRS magnet was tuned to center on 210Au, 216Pb, 219Pb, 227At and 229At nuclei along the central trajectory of FRS.
Unambiguous identification of nuclides required the separation of different charge states of the nuclei passing through the FRS. At 1 GeV/nucleon incident energy of 238U, fraction of fully stripped 226Po nuclei was about 89%. Through the measurement of difference in magnetic rigidity in the two sections of the FRS and the difference in energy loss in the two ionization chambers, the charge state of the transmitted nuclei was determined, especially, that of the singly charged (hydrogen-like) nuclei which preserved their charge in the current experimental setup. Measured production cross sections with 10% statistical and 20% systematic uncertainties
Criterion established in 2010Al24 for acceptance of identification of a new nuclide: 1. number of events should be compatible with the corresponding mass and atomic number located in the expected range of positions at both image planes of the FRS spectrometer; 2. number of events should be compatible with >95% probability that at least one of the counts does not correspond to a charge-state contaminant. Comparisons of measured σ with model predictions using the computer codes COFRA and EPAX. See also previous report 2009Al32 by the same group as 2010Al24
Structure calculations:
2013Wa15: calculated pairing energy. Analyzed effects of the optimized pairing force on the pairing energy and binding energy
2011Bh06: calculated pairing energy, two-neutron separation energy
2008Ma17: HFB calculations of binding energy, two-neutron separation energy, odd-even mass staggering and pairing gaps.
1992Kr07: calculated potential well depth, rigid moment of inertia, and quadrupole moment from microscopic HF-BCS calculations.
2003Bo06: calculated T1/2 using Shell model and quasiparticle RPA
Q-value: Estimated uncertainties in 2012Wa38: 200 for Q(β-), 220 for S(n) 360 for S(p) and Q(α)
Q-value: S(2n)=8480 200, S(2p)=18280 450 (syst,2012Wa38)