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Recoil distance lifetime measurements in /sup 69/As and /sup 72/Se

Journal Article · · Phys. Rev., C; (United States)
; ; ; ; ;

High spin states in /sup 69/As and /sup 72/Se have been excited in oxygen induced reactions on /sup 55/Mn, /sup 54,56/Fe, and /sup 58/Ni targets. On the basis of ..gamma gamma.. coincidences, angular distributions, and excitation functions, a level scheme of /sup 69/As is proposed. The following mean lives (in the parentheses) have been determined by the recoil distance Doppler shift method: in /sup 72/Se with level energies in keV, 862 (5.2 +- 0.5 ps); 1634 (2.7 +- 0.3 ps); 2466 (2.2 +- 0.3 ps); 3770 (9 +- 3 ps); in /sup 69/As, 1307 (1.95 +- 0.05 ns); 2161 (5.1 +- 0.8 ps); 5198 (11.3 +- 1.5 ps). It is suggested that the positive parity states in /sup 69/As form a rotational aligned g/sub 9/2/ proton band with ..gamma.. approx. = 30/sup 0/. The presumed 25/2/sup +/ intruder state features the same deformation as deduced from he 13/2/sup +/ ..-->.. 9/2/sup +/ B (E2) value.

Research Organization:
Institut fuer Kernphysik der Universitaet zu Koeln, 5000 Koeln 41, Germany
OSTI ID:
6928333
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 17:6; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

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Experimental-- Nuclear Reactions & Scattering-- (-1987)
651623 -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
ARSENIC 69
ARSENIC ISOTOPES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
EXCITED STATES
FERMIONS
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
INTERMEDIATE MASS NUCLEI
IRON 54 TARGET
IRON 56 TARGET
ISOTOPES
LIFETIME
MANGANESE 55 TARGET
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NICKEL 58 TARGET
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
OXYGEN 16 REACTIONS
OXYGEN 18 REACTIONS
PROTONS
RADIOISOTOPES
RECOILS
ROTATIONAL STATES
SELENIUM 72
SELENIUM ISOTOPES
TARGETS