ADOPTED LEVELS for 100Rb
Authors: Balraj Singh and Jun Chen | Citation: Nucl. Data Sheets 172, 1 (2021) | Cutoff date: 31-Jan-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=13574 keV 21 | S(n)= 3197 keV 20 | S(p)= 14780 keV SY | Q(α)= -10510 keV SY | ||
| Reference: 2017WA10 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0 | (4-) | 52 ms 2 % β- = 100 % β-n = 5.6 12 % β-2n = 0.15 5 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | (4-) | 52 ms 2 % β- = 100 % β-n = 5.6 12 % β-2n = 0.15 5 | %β-n: weighted average of 8 2 (1987PfZX) and 5.0 10 (1986ReZU). others: ≈35 (2010MaZS), 26 8 (2001Lh02, from gamma-ray intensities and assuming no β feeding to 100Sr g.s.). E(level): %β-n: weighted average of 8 2 (1987PfZX) and 5.0 10 (1986ReZU). others: ≈35 (2010MaZS), 26 8 (2001Lh02, from gamma-ray intensities and assuming no β feeding to 100Sr g.s.). |
The 100Rb isotope produced and identified by mass separation from fission of 235U with neutrons (1986Wa17,1982Kr11,1979Pe01, 1978Ko29) and protons (1979Az01). 2001Lh02 produced this isotope from fission of 238U by 600-MeV protons at the ISOLDE facility.
2011Ni01: 100Rb nuclide produced in 9Be(238U,F) reactions at E=345 MeV/nucleon produced by the cascade operation of the RIBF complex of accelerators at RIKEN. Target=550 mg/cm2. Identification of 100Rb made on the basis of magnetic rigidity, time-of-flight and energy loss. The separated nuclei were implanted in a nine-layer double-sided silicon-strip detector (DSSSD). Correlations were recorded between the heavy ions and β rays. The half-life of 100Rb isotope was measured from the correlated ion-β decay curves and maximum likelihood analysis technique. In the analysis of the decay curve, β-detection efficiency, background rate, daughter and granddaughter (including those populated in delayed neutron decays) half-lives, and β-delayed neutron emission probabilities were considered. Comparison of measured half-lives with FRDM+QRPA and KTUY+GT2 calculations.
Mass measurements: 2017De18, 2016Kl04, 2013Ma81
An isomer with possible Jπ=(6+) is proposed by 1995Pf04 on the basis of an apparent β- feeding of a (6+) level in 100Sr and β-n feeding of an 11/2+ level in 99Sr from 100Rb decay. Possible configuration=π3/2[431]~#ν9/2[404] (1995Pf04). On the other hand, 2001Lh02 (same authors as those of 1995Pf04) proposed a low-spin isomer 1- with configuration=π3/2[431]~#ν5/2[532]. But none of these activities have been confirmed so far.
Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for eight primary references, four dealing with nuclear structure calculations and four with decay modes and half-lives.
Q-value: Estimated uncertainties (2017Wa10): 400 for S(p), 300 for Q(α).
Q-value: S(2n)=8021 25, S(2p)=32580 400 (syst), Q(β-n)=8203 20 (2017Wa10). Q(β-2n)=4033 20 (deduced by evaluators from masses in 2017Wa10)