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Title: Nuclear energy release from fragmentation

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Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
FG02-13ER42025; SC0009971
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 952; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-07 09:52:35; Journal ID: ISSN 0375-9474
Country of Publication:

Citation Formats

Li, Cheng, Souza, S. R., Tsang, M. B., and Zhang, Feng-Shou. Nuclear energy release from fragmentation. Netherlands: N. p., 2016. Web. doi:10.1016/j.nuclphysa.2016.04.002.
Li, Cheng, Souza, S. R., Tsang, M. B., & Zhang, Feng-Shou. Nuclear energy release from fragmentation. Netherlands. doi:10.1016/j.nuclphysa.2016.04.002.
Li, Cheng, Souza, S. R., Tsang, M. B., and Zhang, Feng-Shou. 2016. "Nuclear energy release from fragmentation". Netherlands. doi:10.1016/j.nuclphysa.2016.04.002.
title = {Nuclear energy release from fragmentation},
author = {Li, Cheng and Souza, S. R. and Tsang, M. B. and Zhang, Feng-Shou},
abstractNote = {},
doi = {10.1016/j.nuclphysa.2016.04.002},
journal = {Nuclear Physics. A},
number = C,
volume = 952,
place = {Netherlands},
year = 2016,
month = 8

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nuclphysa.2016.04.002

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  • A statistical nuclear fragmentation model is used to calculate the charge distributions and energy spectra of heavy ({ital z}{gt}4) fragments produced in 1 GeV per nucleon collisions of cosmic-ray {sup 12}C and {sup 16}O with the large-scale integration devices materials: {sup 16}O, {sup 28}Si, {sup 70}Ga, {sup 75}As, and {sup 197}Au. Results for {sup 56}Fe+{sup 12}C at 980 MeV per nucleon are also presented and compared with available data. Calculated charge distributions show a clustering pattern into three {ital z}-number groups while kinetic-energy spectra reveal soft shapes over a 100-MeV range. Charge-distribution and energy-spectrum absolute cross sections from {sup 16}O-inducedmore » fragmentation of {sup 28}Si are 1--2 orders of magnitude larger than those from {sup 12}C-induced fragmentation.« less
  • An additive quark model is used to derive relations which allow determination of fragmentation functions of ''wounded'' and spectator quarks from the A dependence of the spectra of particles produced in high-energy, low-momentum-transfer collisions of hadrons and nuclei. The method is applied to spectra of strange particles produced in 300-GeV proton-nucleus collisions. The implications for a fragmentation mechanism of high-energy hadrons are discussed.
  • The fragmentation of metastable CH/sub 4//sup +/, CD/sub 3/H/sup +/, and CD/sub 4//sup +/ ions has been studied with use of mass analyzed ion kinetic energy spectrometry (MIKES).Kinetic energy release distributions were derived from the MIKES peaks. The average kinetic energy release and metastable intensity were found to increase with ion source temperature. Appearance potential measurements indicated that the metastable reaction arises from CH/sub 4//sup +/ ions with internal energy close to the thermochemical threshold for fragmentation to give ground state CH/sub 3/(/sup 1/A/sub 1/) + H(/sup 2/S). The experimental data suggest that the origin of the metastable process ismore » tunneling through a centrifugal barrier. A statistical model is presented and predictions of the model are compared with the experimental data.« less
  • The current signals of the parent and the different daughter ions formed by laser multiphoton ionization fragmentation techniques are studied as a function of the delay between the laser pulse and the pulsed accelerating voltage of a reflectron time-of-flight mass spectrometer. The decay of most of the current signals is found to be exponential and is described in terms of ion escape from the collection volume of the mass spectrometer. From the square of the observed decay constants, the relative kinetic energies of the ions can be determined. Since the parent ion is formed thermally, the kinetic energies of themore » daughter ions relative to that of the parent ion are converted into absolute kinetic energies of the daughter ions. Both the small values of the observed average kinetic energy release and the small spread observed in these values for most of the fragment ions formed from 1,4-dichlorobenzene are discussed in terms of the statistical theory of dissociation as well as the nature of the UV mulitphoton ionization dissociation process.« less
  • The kinetic energy release distributions in the fragmentation C/sub 4/H/sub 6//sup +/..-->..C/sub 3/H/sub 3//sup +/+CH/sub 3/ at selected energies are reported and are compared with the analogous distributions from ''metastable'' C/sub 4/H/sub 6//sup +/ and from C/sub 2/H/sub 2//sup +/+C/sub 2/H/sub 4/ collision complexes. The data seem to reflect the role of angular momentum in the collision experiments, as predicted by the Langevin model of the quasiequilibrium theory.