Single particle structure of high spin states in [sup 144]Pm and [sup 145]Pm
The level structures of [sub 61][sup 144]Pm[sub 83] and [sub 61][sup 144]Pm[sub 84] were investigated using heavy-ion reactions and the techniques of [gamma]-ray and electron spectroscopy as well as transfer reactions. Decay schemes were constructed from prompt [gamma]-[gamma]-coincidence, delayed [gamma]-[gamma]-coincidence, excitation function, angular distribution and conversion electron measurements of the [sup 19]F + [sup 130]Te fusion-evaporated reaction at beam energies between 70 and 95 MeV. A total of 53 new transitions and 31 new levels were placed in [sup 144]Pm. The level scheme extends to spin J = 20 [h bar] and an excitation energy of 5.8MeV. Transitions feeding the 841 keV (J[sup [pi]] = 9[sup +]) isomeric state were observed for the first time. The reduced B(E3) transition strength for the 669 keV (9[sup +] [yields] 6[sup [minus]]) transition deexciting this state was determined to be 3.2(7) Weisskopf units, supporting the interpretation of the 9[sup +] level as a [[pi]1h[sub 11/2] [circle times] [nu]2f[sub 7/2]] non-collective state. Nineteen new levels connected by 32 new transitions extended the decay scheme of [sup 145]Pm up to a tentative spin of (33/2)[h bar] and an excitation energy of 4.7 MeV. The 11/2[sup [minus]] isomeric state at 795 keV was identified as a single h[sub 11/2] proton state in the [sup 144]Nd ([sup 7]Li, [sup 6]He) stripping reaction at a beam energy of 34 MeV. A measurement of the B(E3) reduced transition strength (7.8(18) Weisskopf units) of the 795 keV (11/2[sup [minus]] [yields] 5/2[sup +][sub g.s]) transition deexciting this state supports this interpretation. A weak coupling model can explain the structure of the deduced decay scheme up to an excitation energy of 2.5 MeV. The spectroscopy of [sup 144]Pm and [sup 145]Pm is discussed in terms of couplings of single-particle states to a [sup 146]Gd core using empirical shell-model calculations. Good agreement with the experimental results is obtained.
- Research Organization:
- Florida State Univ., Tallahassee, FL (United States)
- OSTI ID:
- 5705275
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
BEAMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COINCIDENCE SPECTROMETRY
COUNTING TECHNIQUES
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DECAY
DIRECT REACTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON SPECTROSCOPY
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
FLUORINE 19 BEAMS
FUNCTIONS
GADOLINIUM 146
GADOLINIUM ISOTOPES
GAMMA RADIATION
GAMMA SPECTROSCOPY
HEAVY ION REACTIONS
HELIUM 6
HELIUM ISOTOPES
HIGH SPIN STATES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ION BEAMS
IONIZING RADIATIONS
ISOTOPES
KEV RANGE
KEV RANGE 100-1000
LIGHT NUCLEI
LITHIUM 7
LITHIUM ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MILLISEC LIVING RADIOISOTOPES
NEODYMIUM 144
NEODYMIUM ISOTOPES
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PROMETHIUM 144
PROMETHIUM 145
PROMETHIUM ISOTOPES
RADIATIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SPECTROSCOPY
STABLE ISOTOPES
TARGETS
TELLURIUM 130 TARGET
TRANSFER REACTIONS
WEAK-COUPLING MODEL
YEARS LIVIN
YEARS LIVING RADIOISOTOPES