New Giant Resonances in 172-MeVαScattering fromPb208

IsoscalarE0−E3strength inSn116,Youngblood1, Lui2, Clark3 et al. 2004Phys. Rev. C

“…The energy reported by Davis et al [9] for the upper component ͑22.4± 0.5 MeV͒ is consistent with both measurements, but Davis et al report a width of 3.5± 0.5 MeV, nearly a factor of 3 less than either our result or that from Osaka. Morsch et al [8] could not definitively identify the ISGDR, but suggested a peak at 21.4± 0.5 MeV with a width of 5.65± 0.6 MeV was due to the ISGDR. Our experimental strength functions are compared to HartreeFock-random-phase approximation (HF-RPA) calculations of Colo et al [29] and relativistic calculations of Vretenar et al [30] in Fig.…”

“…The isoscalar giant monopole resonance (GMR), of particular interest since its energy can be directly related to the nuclear compressibility [5], was identified in 1977 [6] and was the subject of a number of studies through the 1980s [3,7]. The isoscalar giant dipole resonance (ISGDR) was first tentatively reported by Morsch et al [8] in 208 Pb and a definitive identification was made by Davis et al [9], also in 208 Pb. Like the GMR, the ISGDR is a compression mode [10] and provides information about the nuclear compressibility from which the compressibility of nuclear matter ͑K NM ͒ can be obtained [5].…”

Isoscalar giant resonances inZr90,92,94

“…Using electron scattering, Nagao and Torizuka [9] in 1973 reported the observation of an isoscalar octupole state in 208 Pb at E x ∼ 19 MeV exhausting 44% of the * krishi@tunl.duke.edu & krishichayan@gmail.com E3 EWSR. Seven years later, Carey et al [10], using 800 MeV protons, reported identifying an octupole resonance in 40 Ca, 116 Sn, and 208 Pb at about E x = 110/A 1/3 MeV, while Morsch et al [11] using 152 MeV alpha particles reported both an octupole resonance at E x = 17.5 MeV and an isoscalar dipole resonance at E x = 21.3 MeV in 208 Pb. In 1976, Moss et al [12] using inelastic scattering of alpha particles, identified the 1 ω component of the isoscalar octupole giant resonance at E x ∼ 32/A 1/3 MeV in 7 medium mass nuclei.…”

Giant multipole resonances — perspectives after ten years

“…No LEOR is observed in '*°Ca or 208 Pb. Within the past few months suggestions have been made for the systematic observation of a 3tfu giant octupole resonance (GOR) through inelastic scattering of 800-MeV protons, 26 ) 172-MeV alpha-particles 27 ), and 110-140 MeV helium-3 particles. Figure 19 shows inelastic proton spectra 26 ) (800 MeV incident protons) on 208 Pb, 116 Sn and U0 Ca.…”