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-)=520 keV SYS(n)= 5660 keV SY
Reference: 2017WA10

General Comments:

1960Di03: 252Cm produced as the great-great granddaughter to 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 252Cm was inferred from the detection of 252Cf (T1/2=2.647 y) assuming the following decay 252U --> 252Np --> 252Pu --> 252Am --> 252Cm --> 252Bk --> 252Cf.

1966Rg01: Analysis of debris from fused rock following Par and Barbel low-yield thermonuclear explosions. Prompt mass spectrometric measurements to search for 252Cm; deduced upper limit for T1/2

Related articles: 1956Fi11, 1967Ho20, and 1969In01

Q-value: ΔQ(β-)=360 (2017Wa10)

Q-value: S(2n)=10080 (syst) 300 (2017Wa10)

Jπ(level) T1/2(level)
  0.0? 0+ < 2 d
% β- = 100

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Additional Level Data and Comments:

  0.00+ < 2 d
% β- = 100
Theoretical β decay T1/2 > 100 s (2019Mo01).

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