Response functions of 58Ni, 116Sn AND 208Pb to the excitation of intermediate-energy α-particles

Bonin, Bernard; Alamanos, N.; Berthier, B.; Bruge, G.; Faraggi, H.; Legrand, Dominique; Lugol, J.C.; Mittig, W.; Papineau, L.; Yavin, A. I.; Scott, D.K.; LeVine, M. J.; Arvieux, J.; Farvacque, L.; Buénerd, M.

doi:10.1016/0375-9474(84)90044-7

Cited by 77 publications

(23 citation statements)

References 51 publications

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“…Multipole strength distributions corresponding to L=0-2 have been extracted using the standard MDA procedure [35]. Contributions from each multipole are determined in terms of fractions of 100% of the energy weighted sum rule (EWSR) [36,37] by fitting a linear combination of calculated angular distributions to corresponding experimental cross sections.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

Effect of ground-state deformation on isoscalar giant resonances inSi28

et al. 2016

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Multipole strength distributions for isoscalar L ≤ 2 transitions in 28 Si have been extracted using 386-MeV inelastic α scattering at extremely forward angles, including 0• . Observed strength distributions are in good agreement with microscopic calculations for an oblate-deformed ground-state. In particular, a large peak at an excitation energy of 17.7 MeV in the isoscalar giant monopole resonance (ISGMR) strength is consistent with the calculations.

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Section: Data Analysis and Resultsmentioning

confidence: 99%

Effect of ground-state deformation on isoscalar giant resonances inSi28

et al. 2016

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“…A multipole decomposition analysis (MDA) procedure [10] was employed to extract the strengths of the ISGMR, along with those for other isoscalar resonances (up to L = 3). The associated DWBA calculations were performed with the computer code PTOLEMY [11], following the method of Satchler and Khoa [12], using the density-dependent single-folding model for the real part, obtained with a Gaussian α-nucleon potential, and a phenomenological Woods-Saxon potential for the imaginary term.…”

Section: Experimental Techniquesmentioning

confidence: 99%

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Garg¹

2011

Acta Phys. Pol. B

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We have investigated the isoscalar giant monopole resonances (ISGMR) in 112−124 Sn and 106−116 Cd nuclei using inelastic scattering of 386-MeV α-particles at extremely forward angles, including 0 • . The strength distributions for various multipoles were extracted by a multipole decomposition analysis based on the expected angular distributions of the respective multipoles. From the ISGMR results, a value of K τ ∼ −500 MeV is obtained for the asymmetry term in the nuclear incompressibility.

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“…1(a) and (b), respectively. To extract the monopole contribution from the cross sections, a multipole decomposition analysis (MDA) [37,38] was performed for each bin in E x by fitting the differential cross section with a linear combination of distorted wave Born approximation (DWBA) angular distributions for angular momentum transfers of ∆L = 0, 1, 2 and 3. The DWBA calculations were performed using the code FOLD/DWHI [39].…”

mentioning

confidence: 99%

Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)
Zamora
¹
,
Zegers
²
,
Austin
³

et al. 2019
Phys. Rev. C

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The Gamow-Teller strength distribution from 88 Sr was extracted from a (t, 3 He + γ) experiment at 115 MeV/u to constrain estimates for the electron-capture rates on nuclei around N = 50, between and including 78 Ni and 88 Sr, which are important for the late evolution of core-collapse supernovae. The observed strength below an excitation energy of 8 MeV was consistent with zero and below 10 MeV amounted to 0.1 ± 0.05. Except for a very-weak transition that could come from the 2.231-MeV 1 + state, no γ lines that could be associated with the decay of known 1 + states were identified. The derived electron-capture rate from the measured strength distribution is more than an order of magnitude smaller than rates based on the single-state approximation presently used in astrophysical simulations for most nuclei near N = 50. Rates based on shell-model and quasiparticle random-phase approximation calculations that account for Pauli blocking and core-polarization effects provide better estimates than the single-state approximation, although a relatively strong transition to the first 1 + state in 88 Rb is not observed in the data. Pauli unblocking effects due to high stellar temperatures could partially counter the low electron-capture rates. The new data serves as a zero-temperature benchmark for constraining models used to estimate such effects.

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Response functions of 58Ni, 116Sn AND 208Pb to the excitation of intermediate-energy α-particles

Cited by 77 publications

References 51 publications

Effect of ground-state deformation on isoscalar giant resonances inSi28

Effect of ground-state deformation on isoscalar giant resonances inSi28

Untitled

Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)
Zamora
¹
,
Zegers
²
,
Austin
³

et al. 2019
Phys. Rev. C

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Response functions of 58Ni, 116Sn AND 208Pb to the excitation of intermediate-energy α-particles

Cited by 77 publications

References 51 publications

Effect of ground-state deformation on isoscalar giant resonances inSi28

Effect of ground-state deformation on isoscalar giant resonances inSi28

Untitled

Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)Zamora1, Zegers2, Austin3 et al. 2019Phys. Rev. C

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Experimental constraint on stellar electron-capture rates from the Sr88(t,He3+γ)
Zamora
¹
,
Zegers
²
,
Austin
³

et al. 2019
Phys. Rev. C