Identification of the (9/2/sup +/ to (5/2/sup -/ transition in /sup 69/Se
Gamma rays from /sup 69/Se have been investigated using the reaction /sup 40/Ca(/sup 32/S,2pn ..gamma..)/sup 69/Se between 80 and 110 MeV beam energy. Isotopic identification was based on excitation functions, n-..gamma.. and n-..gamma..-..gamma.. coincidences, as well as genetic relationships. An isomeric state (T/sub 1/2/ = 853 +- 78 ns) was found at 575.0 +- 0.4 keV decaying to the first excited state which was located at 40.2 +- 0.3 keV. The isomeric state lifetime reveals the same degree of inhibition as in analogous M2 ((9/2/sup +/..-->..(5/2/sup -/) transitions and the excitation energy displays the systematic trend of the first (9/2/sup +/ state in the N = 35 and N = 37 isotones. The observed ..gamma.. decay properties are consistent with J/sup ..pi../ = (3/2/sup -/ for the /sup 69/Se ground state, in agreement with the indications given by previous beta decay studies. A first level scheme, including four levels in /sup 69/Se, is proposed.
- Research Organization:
- Centre de Recherches Nucleaires, 67037 Strasbourg, France
- OSTI ID:
- 5710609
- Journal Information:
- Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 37:2; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVAPORATION MODEL
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
FERMIONS
FUNCTIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITIONS
ISOTONIC NUCLEI
ISOTOPES
LIFETIME
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARITY
PARTICLE PROPERTIES
PROTONS
RADIATIONS
RADIOISOTOPES
SELENIUM 69
SELENIUM ISOTOPES
SPIN
SULFUR 32 REACTIONS
TARGETS