Analog (<i>p</i>,<i>n</i>) cross sections of even-even palladium isotopes at 26 MeV

Jd, Anderson; Brown, Vienna R.; Rw, Bauer; Ba, Pohl; Ch, Poppe; Stamer, S.; Mordhorst, E.; Scobel, W.; Sm, Grimes; Madsen, V.A.

doi:10.1103/physrevc.41.1993

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…Statistics of calculated GT strength distributions for nuclei using different RPA models given in second column. For references of theoretical calculations see text, while experimental references are: (a) [18], (b) [21], (c) [22], (d) [23], (e) [24], (f) [20]. .…”

Section: Calculations and Resultsmentioning

confidence: 99%

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Nuclear inputs of key iron isotopes for core-collapse modeling and simulation

Nabi

Tawfik

2014

Phys. Scr.

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Abstract. From the modeling and simulation results of presupernova evolution of massive stars, it was found that isotopes of iron, 54,55,56 Fe, play a significant role inside the stellar cores, primarily decreasing the electron-to-baryon ratio (Y e ) mainly via electron capture processes thereby reducing the pressure support. The neutrinos produced, as a result of these capture processes, are transparent to the stellar matter and assist in cooling the core thereby reducing the entropy. The structure of the presupernova star is altered both by the changes in Y e and the entropy of the core material. Here we present the microscopic calculation of Gamow-Teller strength distributions for isotopes of iron. The calculation is also compared with other theoretical models and experimental data. Presented also are stellar electron capture rates and associated neutrino cooling rates, due to isotopes of iron, in a form suitable for simulation and modeling codes. It is hoped that the nuclear inputs presented here should assist core-collapse simulators in the process of fine-tuning of the Y e parameter during various phases of presupernova evolution of massive stars. A reliable and accurate time evolution of this parameter is a possible key to generate a successful explosion in modeling of core-collapse supernovae.

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Section: Calculations and Resultsmentioning

confidence: 99%

“…The centroids and widths were calculated from the reported measured data and all measured data are given to one decimal place in table 4. For the β − side the measured data for Fe 54 were taken from [21][22][23][24]. For the electron capture direction, experimental data for Fe 54 were taken from [18,21].…”

Section: Calculations and Resultsmentioning

confidence: 99%

Nuclear inputs of key iron isotopes for core-collapse modeling and simulation

Nabi

Tawfik

2014

Phys. Scr.

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“…We have measured spectra from (t9, x n) reactions on a whole series of Pd isotopes and compared them with preequilibrium-model calculations. These investigations extend the work for nuclei around closed neutron and/or proton shells [5,6,14] and supplement the information from DWBA and coupied-channel calculations for the (p, p') reactions and the (p, n) transitions to the isobar analogues for the target nuclei under study [17]. The high-energy part of the neutron spectra measured with improved (250 keV) energy resolution displays structure differing from isotope to isotope.…”

Section: Discussionmentioning

confidence: 95%

“…In this way we obtained an energy resolution of about 250 keV (depending slightly on the individual detector and the target thickness) for the highest-energy neutrons detected (E, > 20' MeV). The layout and more details on the setup are presented in a recent paper [17].…”

Section: Methodsmentioning

confidence: 99%

Preequilibrium emission in (p, x n) reactions on palladium isotopes

Hölbling

Čaplar

Stamer

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Energy spectra of neutrons from the lO4, 105,106, lO8,110pd(p ' xn) reactions at E v = 26.1 MeV have been measured using the time-of-flight technique with good overall energy resolution (<250 keV). The hard part of angle-integrated spectra corresponding to low residual excitations (U<6MeV) exhibits pronounced structure varying from isotope to isotope. The observed structure can be reasonably well described by preequilibrium-model calculations with two-quasiparticle state densities for proton-particle neutron-hole configurations based on Nilsson-model single-particle levels instead of equidistant ones. The influence of nuclear deformation and pairing on preequilibrium particle emission is explored.

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