ADOPTED LEVELS:INFERRED for 252Bk
Authors: A.M. Mattera, S. Zhu, A.B. Hayes, E.A. Mccutchan | Citation: Nucl. Data Sheets 172, 543 (2021) | Cutoff date: 1-Jan-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=2500 keV SY | S(n)= 4770 keV SY | S(p)= 5400 keV SY | Q(α)= 5550 keV SY | ||
| Reference: 2017WA10 |
| E(level) (keV) | T1/2(level) |
| 0.0? | % β- = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | % β- = 100 | Theoretical β decay T1/2 > 100 s (2019Mo01). |
1960Di03: 252Bk produced in the decay chain of 252U produced through successive neutron captures on 238U in the first large scale thermonuclear test explosion (Ivy Mike) on November 1, 1952 in the Pacific Ocean. Neutrons were produced through deuterium-tritium fusion (En=14 MeV) and also from the fission of uranium. Airborne debris was collected on filter paper and larger samples collected from condensed debris from an adjacent atoll. Elements 94 to 100 were chemically extracted and purified. Pu, Am, and Cm fractions were measured with 12-inch 60|’ mass spectrometers. The abundances of the transcurium isotopes were determined from measuring α or β activities combined with known half-lives. The production of 252Bk was inferred from the detection of 252Cf (T1/2=2.647 y) assuming the following decay 252U --> 252Np --> 252Pu --> 252Am --> 252Cm --> 252Bk --> 252Cf.
Related articles: 1956Fi11, 1967Ho20, 1966Rg01, and 1969In01
Q-value: ΔQ(β-)=200; ΔS(n)=200; ΔS(p)=200; ΔQ(α)=280 (2017Wa10)
Q-value: S(2n)=10560 (syst) 200 (2017Wa10)