Potential description of the positive- and negative-energy properties of the. cap alpha. + /sup 40/Ca system and. cap alpha. -cluster structure of /sup 44/Ti

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.37.292· OSTI ID:5581137

Michel, F; Reidemeister, G; Ohkubo, S

The ..cap alpha..-cluster structure of the /sup 44/Ti nucleus is investigated within a local potential model description, starting from the unique optical potential which describes elastic /sup 40/Ca(..cap alpha..,..cap alpha..) scattering on broad angular and energy ranges, and which has recently been shown to describe the broad oscillations seen in the low energy fusion excitation function as well. It is found that the various ..cap alpha..-cluster states group into quasirotational bands whose properties are not dissimilar to those of the well-understood /sup 20/Ne nucleus. The lowest lying band is composed of states of even parity with moderate cluster character at low spin; it agrees within a few MeV's in absolute energy with the /sup 44/Ti experimental ground state band, and the experimental intraband quadrupole transition probabilities are reproduced with good accuracy. The potential supports an excited positive parity band with strong cluster character, starting a few MeV's above the ..cap alpha..+ /sup 40/Ca threshold; the states of this band with spins ranging from 6 to 12 are responsible for the oscillations observed in the fusion excitation function. It supports, in addition, a negative parity band starting just above the threshold and composed of narrow states with intermediate cluster character; the latter has up to now no experimentally known counterpart. The states of higher lying bands are very broad and overlapping but they play an important role in enhancing the /sup 40/Ca(..cap alpha..,..cap alpha..) backward angle cross section. Our results are discussed in terms of the available experimental evidence and of the various, often conflicting theoretical interpretations which have been put forward to describe the /sup 44/Ti ..cap alpha..-cluster spectroscopy.

• Research Organization: Faculte des Sciences, Universite de l'Etat, B-7000 Mons, Belgium
• OSTI ID: 5581137
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 37:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
BETA DECAY RADIOISOTOPES
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
CROSS SECTIONS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
EXCITED STATES
FUNCTIONS
HEAVY ION FUSION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
OPTICAL MODELS
RADIOISOTOPES
ROTATIONAL STATES
SHELL MODELS
TARGETS
TITANIUM 44
TITANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES