ADOPTED LEVELS, GAMMAS for 98Rb
Authors: Jun Chen, Balraj Singh | Citation: Nucl. Data Sheets 164, 1 (2020) | Cutoff date: 15-Feb-2020
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=12054 keV 16 | S(n)= 3921 keV 16 | S(p)= 1423×101 keV 13 | Q(α)= -9390 keV SY | ||
| Reference: 2017WA10 |
| References: | |||
| A | 98Rb IT decay (0.358 μs) | B | 99Kr β-n decay (37 MS) |
| C | U(p,X) | D | Coulomb Excitation |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A CD | 0(-) | 115 ms 6 % β- = 100 % β-n = 14.3 9 % β-2n = 0.054 8 | |||||
| 50.2 3 | D | < 0.7 ns | 50.2 3 | 100 | 0.0 | 0(-) | ||
| 113.8 2 | D | (2-) | 1.18 ns 35 | 113.8 2 | 100 | [E2] | 0.0 | 0(-) |
| 123.8 5 | A | (1,2-) | 123.8 5 | 100 | 0.0 | 0(-) | ||
| 144.9 15 | D | < 0.7 ns | 94.7 14 | 100 | 50.2 | |||
| 178.3 5 | A | 0.358 µs 7 % IT = 100 | 54.5S 178.3 5 | 100 5 | 123.8 0.0 | (1,2-) 0(-) | ||
| 244.0 20 | D | < 0.7 ns | 99.1 13 | 100 | 144.9 | |||
| 258.4 2 | D | (2-) | 258.4 2 | 100 | 0.0 | 0(-) | ||
| ≈270 | C | (3+) | 96 ms 3 % β- = 100 % β-n = 14.3 9 % β-2n = 0.054 8 | |||||
| 432.1 6 | D | (1-,2-) | 318.3 8 432.1 8 | 100 38 | 113.8 0.0 | (2-) 0(-) | ||
| 636.8 15 | D | 378.4 14 | 100 | 258.4 | (2-) | |||
E(level): From a least-squares fit to γ-ray energies, unless otherwise stated.
E(γ): From Coulomb excitation, unless otherwise stated
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Additional Data |
| 113.8 | (2-) | 1.18 ns 35 | 113.8 2 | [E2] | B(E2)(W.u.)=9.4×102 +38-22 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0(-) | 115 ms 6 % β- = 100 % β-n = 14.3 9 % β-2n = 0.054 8 | Evaluated rms charge radius=4.434 fm 42 (2013An02). E(level): Evaluated rms charge radius=4.434 fm 42 (2013An02). |
| 50.2 | < 0.7 ns | T1/2(level): Estimated from Doppler correction for 50.2-, 94.7-, and 99.1-keV γ rays in Coulomb excitation (2016Cl03). | |
| 144.9 | < 0.7 ns | T1/2(level): Estimated from Doppler correction for 50.2-, 94.7-, and 99.1-keV γ rays in Coulomb excitation (2016Cl03). | |
| 244.0 | < 0.7 ns | T1/2(level): Estimated from Doppler correction for 50.2-, 94.7-, and 99.1-keV γ rays in Coulomb excitation (2016Cl03). | |
| 270 | (3+) | 96 ms 3 % β- = 100 % β-n = 14.3 9 % β-2n = 0.054 8 | μ=+1.785 1 (2015Pr03), Q=+1.431 32 (2015Pr03) %β-n and %β-2n are combined for the decays of g.s. and isomer. See the details of the measurements in comments for the g.s. E(level): %β-n and %β-2n are combined for the decays of g.s. and isomer. See the details of the measurements in comments for the g.s. |
| E(level) | E(gamma) | Comments |
| 113.8 | 113.8 | E(γ): The γ transition to the g.s. should have some E2 admixture, as the level is directly populated in Coulomb excitation |
| 123.8 | 123.8 | E(γ): From 98Rb IT decay (0.358 μs) |
| 178.3 | 54.5 | E(γ): from level-energy difference. From 98Rb IT decay (0.358 μs) | 178.3 | E(γ): From 98Rb IT decay (0.358 μs) |
| 432.1 | 432.1 | E(γ): The γ transition to the g.s. should have some E2 admixture, as the level is directly populated in Coulomb excitation |
First identification of 98Rb isotope by 1971Tr02. Later studies of 98Rb decay: 1974Ro15, 1976Ru01, 1978Wo09, 1979En02, 1979Ri09, 1979Pe01, 1980Sc13, 1981En05, 1981Re05, 1981Jo01, 1981Th04, 1986Wa17, 1987PfZX, 1993Ru01, 2011Ni01
2015Pr03: radioactive Rb isotopes were produced using 500 MeV protons from the TRIUMF cyclotron bombarding a uranium carbide target. The atoms were surface ionized, accelerated to 28 keV, mass separated and then delivered to a gas-filled linear Paul trap. Hyperfine structures were studied by fast-beam collinear laser spectroscopy using TITAN mass trap. Measured optical spectra. Deduced spin, magnetic and electric moments, isotope shifts, changes in mean- square charge radii, and deformation parameters. Authors observed two distinguishable nuclear states from measured optical spectrum but were not able to identify either the ground state or the isomeric state due to the insensitivity of the optical measurements to the excitation energies of the observed states. Evaluators assume the low-spin state with J=0 in 2015Pr03 to correspond to the ground state and the high-spin state with J=(3) to correspond to the isomer.
Mass measurements: 2016Kl04, 2013Ma81 (isomer in 98Rb not detected), 2012Si10, 1986Au02, 1979Ep01
Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for 9 primary references, 2 dealing with nuclear structure calculations and 7 with decay modes and half-lives.
Q-value: Estimated uncertainty=300 for Q(α) (2017Wa10)
Q-value: Q(β-n)=6141 16, S(2n)=9157 16, S(2p)=30780 300 (syst) (2017Wa10). Evaluators deduce Q(β-2n)=2412 18