Inclusive measurements of electromagnetic dissociation of [sup 197]Au targets

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1728· OSTI ID:6874004

Aumann, T; Kratz, J V; Stiel, E ^[1]; Suemmerer, K; Bruechle, W; Schaedel, M; Wirth, G ^[2]; Fauerbach, M ^[3]; Hill, J C ^[4]

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1. Institut fuer Kernchemie, Universitaet Mainz, D-6500 Mainz (Germany)
2. Gesellschaft fuer Schwerionenforschung, D-6100 Darmstadt (Germany)
3. Institut fuer Kernphysik, Technische Hochschule Darmstadt, D-6100 Darmstadt (Germany)
4. Iowa State University, Ames, Iowa 50011 (United States)

Cross sections for the electromagnetic dissociation of [sup 197]Au targets by 1.7 GeV/nucleon [sup 20]Ne and 1 GeV/nucleon [sup 86]Kr, [sup 197]Au, and [sup 209]Bi beams have been measured by an activation method. We observe systematic discrepancies between the experimental data and a simple Weizsaecker-Williams calculation: For the heaviest projectiles, the calculation overpredicts the 1[ital n] cross sections, whereas the 2[ital n] and 3[ital n] cross sections are systematically underpredicted. The deviations can be significantly reduced, however, by calculations including isoscalar and isovector giant quadrupole excitations as well as the possibility to excite multiphonon states. The most important experimental result of the present study is the observation of large cross sections for three-neutron removal from [sup 197]Au with [sup 197]Au and [sup 209]Bi projectiles which can only be explained by a dominant contribution from two-phonon giant dipole excitation. For an almost quantitative reproduction for all [ital xn] channels observed, we have to assume a higher excitation probability by roughly a factor of 2 for the double giant dipole resonance as compared to the harmonic approach.

• DOE Contract Number: FG02-92ER40692
• OSTI ID: 6874004
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 209 REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISSOCIATION
ENERGY RANGE
GEV RANGE
GEV RANGE 100-1000
GIANT RESONANCE
GOLD 197 REACTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
INCLUSIVE INTERACTIONS
INTEGRAL CROSS SECTIONS
INTERACTIONS
KRYPTON 86 REACTIONS
NEON 20 REACTIONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
RESONANCE
TARGETS