ADOPTED LEVELS, GAMMAS for 86As
Authors: Alexandru Negret, Balraj Singh | Citation: Nucl. Data Sheets 124, 1 (2015) | Cutoff date: 30-Nov-2014
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=11541 keV 4 | S(n)= 3844 keV 5 | S(p)= 13128 keV 5 | Q(α)= -8456 keV 4 | ||
| Reference: 2012WA38 |
| E(level) (keV) | T1/2(level) |
| 0.0 | 0.945 s 8 % β- = 100 % β-2n = ? % β-n = 35.5 6 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
86As produced and identified by 1973Kr06 (also 1974KrZG,1975Kr08) in neutron-induced fission of 235U followed by chemical separation and half-life measurements. Earlier studies (1966To02,1967De01,1968To18,1968To19,1969WaZS) reported decays of mixed 85As and 86As activities by observing the decay of its descendants 86Se and 86Br, and by counting of delayed neutrons after separation of arsenic sample from other fission products of 235U. α 2-s half-life reported for this mixture most likely corresponded to 85As activity
T1/2 and %β-n measurements: 2013Ma22, 1993Ru01, 1978Cr03, 1973Kr06 (also 1974KrZG,1975Kr08)
Precise mass measurements: 2008Ha23 (Penning-trap method), 2008Su19 (also 2010Li02) (isochronous mass spectrometry)
2013Ma22: proton beam was provided by the Oak Ridge Isochronous Cyclotron (ORIC) at the HRIBF-ORNL facility. Target=238UCx. Fission fragments were ionized to charge state +1 then purified using H2S gas, a mass pre-separator and electromagnetic separation. The purified beams were then sent to the Low-energy Radioactive Ion Beam Spectroscopy Station (LeRIBSS) and implanted in a moving tape collector (MTC). Measured Eγ, Iγ, Eβ, βγ-coin, half-life of 86As g.s. using two plastic scintillation counters and four HPGe detectors. Comparison with the gross theory of β decay, the finite-range droplet model and the continuum quasiparticle random-phase approximation.
Q-value: S(2n)=9251 5, S(2p)=29260 400 (syst), Q(β-n)=5380 4 (2012Wa38)