Systematics of isospin character of transitions to the 2[sub 1][sup +] and 3[sub 1][sup [minus]] states in [sup 90,92,94,96]Zr

Journal Article · Mon Feb 01 00:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.629· OSTI ID:6785100

Horen, D J; Auble, R L; Gomez del Campo, J; Satchler, G R; Varner, R L; Beene, J R ^[1]; Lund, B ^[2]; Brown, V R; Anthony, P L ^[3]; Madsen, V A ^[4]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Department of Physics, Yale University, New Haven, Connecticut 06511 (United States)
3. Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 (United States)
4. Physics Department, Oregon State University, Corvallis, Oregon 97331 (United States)

Differential cross sections for exciting the 2[sub 1][sup +] and 3[sub 1][sup [minus]] states of [sup 90,92,94,96]Zr with 70-MeV [sup 6]Li ions have been measured. Calculations of the cross sections have been performed using a deformed optical model potential (DOMP) with OMP deduced from fits to the elastic data, as well as a folding model with an effective nucleon-nucleon interaction with a Yukawa form factor obtained from fits to the elastic data and transition densities obtained from open-shell random phase approximation (RPA) calculations. The DOMP fits to the data yield values of [ital M][sub [ital n]]/[ital M][sub [ital p]] which are in good agreement with those predicted using the RPA. For the 2[sub 1][sup +] states, we find [ital M][sub [ital n]]/[ital M][sub [ital p]] increases from less than [ital N]/[ital Z] to greater than [ital N]/[ital Z] in going from [sup 90]Zr to [sup 96]Zr. However, for the 3[sub 1][sup [minus]] states [ital M][sub [ital n]]/[ital M][sub [ital p]] remains less than [ital N]/[ital Z] for all cases, a result which is in disagreement with previous works. The folding model, with the RPA transition densities, provides good agreement with the 2[sub 1][sup +] measurements, but underpredicts the cross sections for the 3[sub 1][sup [minus]] states. A reanalysis of the earlier data from excitation of these states by ([alpha],[alpha][prime]) reactions removes much of the apparent discrepancies between those measurements and other measurements, including the ones reported here. The localization of the [sup 6]Li interaction is also discussed.

• DOE Contract Number: AC05-84OR21400; W-7405-ENG-48; FG06-86ER40283; FG02-91ER40609
• OSTI ID: 6785100
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 47:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
LITHIUM 6 REACTIONS
DIFFERENTIAL CROSS SECTIONS
ZIRCONIUM 90 TARGET
ZIRCONIUM 92 TARGET
ZIRCONIUM 94 TARGET
ZIRCONIUM 96 TARGET
DATA ANALYSIS
ISOSPIN
MEV RANGE 10-100
OPTICAL MODES
PARITY
RANDOM PHASE APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ENERGY RANGE
HEAVY ION REACTIONS
MEV RANGE
NUCLEAR REACTIONS
OSCILLATION MODES
PARTICLE PROPERTIES
TARGETS
663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-)
663560 - Nuclear Mass Ranges- A=90-149- (1992-)