ADOPTED LEVELS:TENTATIVE for 248Am
Author: C.D. Nesaraja | Citation: Nucl. Data Sheets 204, 374 (2025) | Cutoff date: 30-Jun-2024
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=3170 keV SY | S(n)= 4660 keV SY | S(p)= 5940 keV SY | Q(α)= 4900 keV SY | ||
| Reference: 2021WA16 |
| E(level) (keV) | T1/2(level) |
| 0.0S | % β- = ? |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | % β- = ? | The systematics of orbitals for this region (1972El21) suggests that the 153rd neutron is probably in the 1/2[620] Nilsson orbital, and the 95th proton is in either the 5/2[523] or the 5/2[642] orbital. E(level): The systematics of orbitals for this region (1972El21) suggests that the 153rd neutron is probably in the 1/2[620] Nilsson orbital, and the 95th proton is in either the 5/2[523] or the 5/2[642] orbital. |
1960Di03: 248Am produced from the decay of 248U in the debris of the first large-scale thermonuclear test (Ivy Mike) of November 1, 1952 in the Pacific Ocean. Airborne and condensed samples were collected, followed by chemical extraction and purification. The heavy uranium isotopes are expected to be produced in an environment of unusually high neutron flux (time-integrated flux of ≈1024 n/cm2) through successive neutron captures in 238U, with neutron energies of 14 MeV from deuterium-tritium fusion, and a few MeV from the fission of 235U. The 248Cm fraction can be formed in 248U --> 248Np --> 248Pu --> 248Am --> 248Cm β- decay chain. Production of 248Am was inferred from the detection of 248Cm (T1/2= 3.48×105 y).
See also related articles: 1956Fi11, 1967Ho20, 1966Rg01 and 1969In01
Theoretical calculations:
2023Zh09,2022Li03: Production cross section calculation using dinuclear system model
Q-value: ΔQ(β-)=200, ΔS(n)=220, ΔS(p)=280, ΔQ(α)=220 (syst,2021Wa16)
Q-value: S(2n)=10570 200 (syst,2021Wa16)