Fine structure of resonance at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>∼ 14 MeV in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>40</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:

Yamagata, T.; Kishimoto, S.; Iwamoto, K.; Saeki, B.; Yuasa, Kei; Tanaka, M.; Ogino, Ken; Matsuki, S.; Fukuda, T.; Inoue, Makoto; Hosono, K.; Shimizu, A.; Matsuoka, N.; Miura, Iwao; Ikku, Y.; Ogata, Hiroshi

doi:10.1103/physrevc.36.573

Cited by 11 publications

(2 citation statements)

References 31 publications

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“…The results are consistent in that the energy weighted sum rule for isoscalar E2 strength is almost exhausted in the excitation range of interest. Strong transitions at energies E x ≤ 12 MeV consist of a mixture of different multipoles [29], while the peaks in the excitation region around 14 MeV were shown to have quadrupole character [30].…”

Section: Methodsmentioning

confidence: 97%

Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

et al. 2011

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The fragmentation of the Isoscalar Giant Quadrupole Resonance (ISGQR) in 40 Ca has been investigated in high energy-resolution experiments using proton inelastic scattering at E p = 200 MeV. Fine structure is observed in the region of the ISGQR and its characteristic energy scales are extracted from the experimental data by means of a wavelet analysis. The experimental scales are well described by Random Phase Approximation (RPA) and second-RPA calculations with an effective interaction derived from a realistic nucleon-nucleon interaction by the Unitary Correlation Operator Method (UCOM). In these results characteristic scales are already present at the mean-field level pointing to their origination in Landau damping, in contrast to the findings in heavier nuclei and also to SRPA calculations for 40 Ca based on phenomenological effective interactions, where fine structure is explained by the coupling to two-particle two-hole (2p-2h) states.

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Section: Methodsmentioning

confidence: 97%

Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

et al. 2011

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“…Kramer's theory, as opposed to transition state theory, is applicable to most reactions that occur in solution. 24 In general, Kramer's theory predicts that the change in entropy between the unbound and transition states is load dependent. Bell's equation, whether derived from transition state theory or the Arrhenius equation, neglects this load-dependent entropy.…”

Section: B Load Dependence Of Entropy and Bell's Equationmentioning

confidence: 99%

The load dependence of rate constants

Walcott

2008

The Journal of Chemical Physics

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As experimental techniques in biophysics have progressed at the single molecule level, there has been considerable interest in understanding how external mechanical influences (such as load) affect chemical reactions. The majority of biophysical studies investigating load-dependent kinetics use an equation where the rate constant exponentially depends on force, which is sometimes called Bell's equation. This equation requires the determination of two parameters that describe the potential energy-strain function: k(0), which is the reaction rate in the absence of load, and x(c), which is the difference in strain between the reactant and transition states. However, there have been theoretical studies based on Kramers' theory suggesting that the rate constant should have load-dependent pre-exponential terms and nonlinear load-dependent terms in the exponential. Kramers' theory requires an exact knowledge of the potential energy-strain function, which is in general not known for an experimental system. Here, we derive a general approximation of Kramers' theory where the potential energy-strain function is described by five parameters, which can, for small loads, be reduced to four-, three-, and finally to two parameters (Bell's equation). We then use an idealized physical system to validate our approximations to Kramers' theory and show how they can predict parameters of interest (such as k(0) and x(c)) better than Bell's equation. Finally, we show previously published experimental data that are not well fitted by Bell's equation but are adequately fitted by these more exact equations.

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20-Calcium

Sukhoruchkin

Soroko

Tables of Excitations From Reactions With Charged Particles. Part 1: Z = 3 - 36

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Fine structure of resonance atEx∼ 14 MeV inCa40

Cited by 11 publications

References 31 publications

Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?

The load dependence of rate constants

20-Calcium

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