STATES OF EVEN-EVEN NUCLEI IN THE NEAR-HARMONIC REGION: SPECTRA OF Rn$sup 218$, Rn$sup 220$, AND Rn$sup 22$$sup 2$

Journal Article · Fri Jul 15 00:00:00 EDT 1960 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.119.796· OSTI ID:4170170

Stephens, F S; Asaro, F; Periman, I

Gamma-ray singles and coincidence spectra were measured in the alpha decay of Ra/sup 222/, Ra/sup 224/, and Ra/sup 226/. Excluding the prominent transitions from the first excited states, the energies (and abundances relative to total alpha emission) of the observed radiations were: Ra/sup 222/: 325 kev (8 4 x 10/sup -5/) 475 kev (7 x 10/sup -5/), 525 kev (2 x 10/sup -5/), and 798 kev (2.5 x 10/sup -4/); Ra/sup 224/: 290 kev (9 x 10/sup -5/), 410 kev (4 x 10/ sup -5/), 65 0 kev (6 x 10/sup -5/); Ra/sup 226/: 260 kev (0.9 x 10/sup -4/) 420 kev (7 x 10/sup -6 450 kev (3 x 10/sup -6/), 610 kev (1.0 x 10/sup -5/). The observed gamma-gamma coincidences were Ra/sup 222/: 325--325 kev, 325--475 kev, and 325--525 kev; Ra/sup 222/: 241--290 kev and 241--410 kev; Ra/sup 226/: 188-260 kev and 188--420 kev. It was not strictly determined that the Ra/ sup 222/ radiations were not due to other members of the Th/sup 226/ family. These data were used to deduce the following levels, spins, and parities in the daughter Ra nuclides: Rn/sup 218/: 650 kev, 2+; 800 kev, 1--; and, possibly, 850 kev, 4+. Rn/sup 220/: 530 kev, 2+; and 650 kev, 1 Ra/sup 222/: 448 kev 2+; and 610 kev, 1--. The 2+ states in Ra/sup 220/ and Rn/sup 222/ have been previously assigned by SchanffGoldhaber. These results are incorporated in a general energy level systematics of even-even nuclei in the heavy element region. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-14-022414
• OSTI ID: 4170170
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 119; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA DECAY
COINCIDENCE METHODS
ENERGY LEVELS
EVEN EVEN NUCLEI
GAMMA RADIATION
MASS NUMBER
MEASURED VALUES
NUCLEI
PARITY
PHYSICS
QUANTITY RATIO
RADIUM 222
RADIUM 224
RADIUM 226
RADON 218
RADON 220
RADON 222
SPECTRA
SPIN
THORIUM 226
TRANSIENTS