Statistical multifragmentation model with Skyrme effective interactions
Autor(a) principal: | |
---|---|
Data de Publicação: | 2009 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104179 |
Resumo: | The statistical multifragmentation model is modified to incorporate the Helmholtz free energies calculated in the finite temperature Thomas-Fermi approximation using Skyrme effective interactions. In this formulation, the density of the fragments at the freeze-out configuration corresponds to the equilibrium value obtained in the Thomas-Fermi approximation at the given temperature. The behavior of the nuclear caloric curve at constant volume is investigated in the micro-canonical ensemble, and a plateau is observed for excitation energies between 8 and 10 MeV per nucleon. A kink in the caloric curve is found at the onset of this gas transition, indicating the existence of a small excitation energy region with negative heat capacity. In contrast to previous statistical calculations, this phase transition takes place even when the system is constrained to fixed volume. The observed phase transition takes place at approximately constant entropy. The charge distribution and other observables also turn out to be sensitive to the treatment employed in the calculation of the free energies and the fragment volumes at finite temperature, specially at high excitation energies. The isotopic distribution is also affected by this treatment, which suggests that this prescription may help obtain information on the nuclear equation of state. |
id |
UFRGS-2_542095ebfc10b7dc51fd9039e5dcd0c7 |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/104179 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Souza, Sergio Ricardo de AzevedoCarlson, Brett VernDonangelo, Raul JoséLynch, William G.Steiner, Andrew W.Tsang, M. B.2014-10-04T02:13:38Z20090556-2813http://hdl.handle.net/10183/104179000705753The statistical multifragmentation model is modified to incorporate the Helmholtz free energies calculated in the finite temperature Thomas-Fermi approximation using Skyrme effective interactions. In this formulation, the density of the fragments at the freeze-out configuration corresponds to the equilibrium value obtained in the Thomas-Fermi approximation at the given temperature. The behavior of the nuclear caloric curve at constant volume is investigated in the micro-canonical ensemble, and a plateau is observed for excitation energies between 8 and 10 MeV per nucleon. A kink in the caloric curve is found at the onset of this gas transition, indicating the existence of a small excitation energy region with negative heat capacity. In contrast to previous statistical calculations, this phase transition takes place even when the system is constrained to fixed volume. The observed phase transition takes place at approximately constant entropy. The charge distribution and other observables also turn out to be sensitive to the treatment employed in the calculation of the free energies and the fragment volumes at finite temperature, specially at high excitation energies. The isotopic distribution is also affected by this treatment, which suggests that this prescription may help obtain information on the nuclear equation of state.application/pdfengPhysical review. C, Nuclear physics. Melville. Vol. 79, no. 5 (May 2009), 054602, 10 p.Física nuclearReacoes nuclearesForcas nuclearesAnálise estatísticaTransformações de faseStatistical multifragmentation model with Skyrme effective interactionsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000705753.pdf000705753.pdfTexto completo (inglês)application/pdf516246http://www.lume.ufrgs.br/bitstream/10183/104179/1/000705753.pdf310530cc7cd2ba914a34c720242978efMD51TEXT000705753.pdf.txt000705753.pdf.txtExtracted Texttext/plain50184http://www.lume.ufrgs.br/bitstream/10183/104179/2/000705753.pdf.txt6445244bf69024e62b1b72defa157fb5MD52THUMBNAIL000705753.pdf.jpg000705753.pdf.jpgGenerated Thumbnailimage/jpeg2143http://www.lume.ufrgs.br/bitstream/10183/104179/3/000705753.pdf.jpg4b5889b13edbda6870a980a5c3d7727bMD5310183/1041792018-10-08 08:53:34.67oai:www.lume.ufrgs.br:10183/104179Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T11:53:34Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Statistical multifragmentation model with Skyrme effective interactions |
title |
Statistical multifragmentation model with Skyrme effective interactions |
spellingShingle |
Statistical multifragmentation model with Skyrme effective interactions Souza, Sergio Ricardo de Azevedo Física nuclear Reacoes nucleares Forcas nucleares Análise estatística Transformações de fase |
title_short |
Statistical multifragmentation model with Skyrme effective interactions |
title_full |
Statistical multifragmentation model with Skyrme effective interactions |
title_fullStr |
Statistical multifragmentation model with Skyrme effective interactions |
title_full_unstemmed |
Statistical multifragmentation model with Skyrme effective interactions |
title_sort |
Statistical multifragmentation model with Skyrme effective interactions |
author |
Souza, Sergio Ricardo de Azevedo |
author_facet |
Souza, Sergio Ricardo de Azevedo Carlson, Brett Vern Donangelo, Raul José Lynch, William G. Steiner, Andrew W. Tsang, M. B. |
author_role |
author |
author2 |
Carlson, Brett Vern Donangelo, Raul José Lynch, William G. Steiner, Andrew W. Tsang, M. B. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Souza, Sergio Ricardo de Azevedo Carlson, Brett Vern Donangelo, Raul José Lynch, William G. Steiner, Andrew W. Tsang, M. B. |
dc.subject.por.fl_str_mv |
Física nuclear Reacoes nucleares Forcas nucleares Análise estatística Transformações de fase |
topic |
Física nuclear Reacoes nucleares Forcas nucleares Análise estatística Transformações de fase |
description |
The statistical multifragmentation model is modified to incorporate the Helmholtz free energies calculated in the finite temperature Thomas-Fermi approximation using Skyrme effective interactions. In this formulation, the density of the fragments at the freeze-out configuration corresponds to the equilibrium value obtained in the Thomas-Fermi approximation at the given temperature. The behavior of the nuclear caloric curve at constant volume is investigated in the micro-canonical ensemble, and a plateau is observed for excitation energies between 8 and 10 MeV per nucleon. A kink in the caloric curve is found at the onset of this gas transition, indicating the existence of a small excitation energy region with negative heat capacity. In contrast to previous statistical calculations, this phase transition takes place even when the system is constrained to fixed volume. The observed phase transition takes place at approximately constant entropy. The charge distribution and other observables also turn out to be sensitive to the treatment employed in the calculation of the free energies and the fragment volumes at finite temperature, specially at high excitation energies. The isotopic distribution is also affected by this treatment, which suggests that this prescription may help obtain information on the nuclear equation of state. |
publishDate |
2009 |
dc.date.issued.fl_str_mv |
2009 |
dc.date.accessioned.fl_str_mv |
2014-10-04T02:13:38Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/104179 |
dc.identifier.issn.pt_BR.fl_str_mv |
0556-2813 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000705753 |
identifier_str_mv |
0556-2813 000705753 |
url |
http://hdl.handle.net/10183/104179 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. C, Nuclear physics. Melville. Vol. 79, no. 5 (May 2009), 054602, 10 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/104179/1/000705753.pdf http://www.lume.ufrgs.br/bitstream/10183/104179/2/000705753.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/104179/3/000705753.pdf.jpg |
bitstream.checksum.fl_str_mv |
310530cc7cd2ba914a34c720242978ef 6445244bf69024e62b1b72defa157fb5 4b5889b13edbda6870a980a5c3d7727b |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1792790286221443072 |