{"id":{"repo_id":"ghent","oai_identifier":"oai:archive.ugent.be:470704"},"canonical_url":"https://search.dev.ndltd.org/etd/ghent/oai:archive.ugent.be:470704","repository":{"repo_id":"ghent","name":"Ghent University","base_url":"https://biblio.ugent.be/oai"},"display":{"title":"Gamow-Teller strength distributions in 64Co and 64Cu studied via the 64Ni(d,2He) and 64Ni(3He, t) reactions","abstract":"Charge exchange reactions are important tools in the study of spin-isospin excitations in nuclei. For intermediate incident energies and very forward scattering angles, peaks corresponding to Gamow-Teller (GT) transitions are expected to dominate the measured spectra and their cross sections becomes proportional to the transition strength. We performed two different reactions on 64Ni for studying the GT transitions both in + and  directions. For the investigation in + direction, the 64Ni(d,2He)64Co experiment was performed at the KVI, Groningen, by using a 171 MeV deuteron beam. The outgoing 2He particles were analyzed by the Big Bite Spectrometer and the EuroSuperNova detector. The complementary reaction, 64Ni(3He,t)64Cu, was performed at the RCNP, Osaka, by using a 420 MeV 3He beam. The outgoing tritium particles were analyzed by the Grand Raiden Spectrometer and the RCNP detector. By the simplicity of these transitions, the strengths determined in this experimental study are a good tool to check different theoretical models. The model independent Ikeda sum rule could also be checked. Only about 29% of the total predicted strength was found in our study suggesting the necessity of an investigation to higher excitation energies, up to about 50 MeV, that could bring more information. But, as the shape and magnitude of the continuum region is still a matter of study, the experimental estimation of the GT strength in this region and the extraction of the full strength remain a problem. Because the studied nuclei are in fp-shell region, the obtained GT strengths constitute an important input in astrophysics, being required for the theoretical calculations of the rates of electron captures processes taking place in the late stage of the supernovae explosion. Important spectroscopic information was also obtained both for 64Co and 64Cu due to the reaction selectivity and the excellent energy resolution achieved in the two experiments.","abstract_html":"Charge exchange reactions are important tools in the study of spin-isospin excitations in nuclei. For intermediate incident energies and very forward scattering angles, peaks corresponding to Gamow-Teller (GT) transitions are expected to dominate the measured spectra and their cross sections becomes proportional to the transition strength. We performed two different reactions on 64Ni for studying the GT transitions both in + and  directions. For the investigation in + direction, the 64Ni(d,2He)64Co experiment was performed at the KVI, Groningen, by using a 171 MeV deuteron beam. The outgoing 2He particles were analyzed by the Big Bite Spectrometer and the EuroSuperNova detector. The complementary reaction, 64Ni(3He,t)64Cu, was performed at the RCNP, Osaka, by using a 420 MeV 3He beam. The outgoing tritium particles were analyzed by the Grand Raiden Spectrometer and the RCNP detector. By the simplicity of these transitions, the strengths determined in this experimental study are a good tool to check different theoretical models. The model independent Ikeda sum rule could also be checked. Only about 29% of the total predicted strength was found in our study suggesting the necessity of an investigation to higher excitation energies, up to about 50 MeV, that could bring more information. But, as the shape and magnitude of the continuum region is still a matter of study, the experimental estimation of the GT strength in this region and the extraction of the full strength remain a problem. Because the studied nuclei are in fp-shell region, the obtained GT strengths constitute an important input in astrophysics, being required for the theoretical calculations of the rates of electron captures processes taking place in the late stage of the supernovae explosion. Important spectroscopic information was also obtained both for 64Co and 64Cu due to the reaction selectivity and the excellent energy resolution achieved in the two experiments.","abstract_has_math":false,"creators":["Popescu, L"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["De Frenne, D"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005","date_published":"2005","updated_at":"2026-07-24T02:22:57Z","subjects":[],"languages":["und"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://biblio.ugent.be/publication/470704","http://doi.org/1854/5255","https://biblio.ugent.be/publication/470704/file/1877880"],"render_values":[{"text":"https://biblio.ugent.be/publication/470704","href":"https://biblio.ugent.be/publication/470704","code":true},{"text":"http://doi.org/1854/5255","href":"http://doi.org/1854/5255","code":true},{"text":"https://biblio.ugent.be/publication/470704/file/1877880","href":"https://biblio.ugent.be/publication/470704/file/1877880","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/1854/LU-470704","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["De Frenne, D"]},{"key":"dc:creator","label":"Author","values":["Popescu, L"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2005"]},{"key":"dc:type","label":"Dc Type","values":["dissertation","info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["und"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://biblio.ugent.be/publication/470704","http://hdl.handle.net/1854/LU-470704","http://doi.org/1854/5255","https://biblio.ugent.be/publication/470704/file/1877880"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Charge exchange reactions are important tools in the study of spin-isospin excitations in nuclei. For intermediate incident energies and very forward scattering angles, peaks corresponding to Gamow-Teller (GT) transitions are expected to dominate the measured spectra and their cross sections becomes proportional to the transition strength. We performed two different reactions on 64Ni for studying the GT transitions both in + and  directions. For the investigation in + direction, the 64Ni(d,2He)64Co experiment was performed at the KVI, Groningen, by using a 171 MeV deuteron beam. The outgoing 2He particles were analyzed by the Big Bite Spectrometer and the EuroSuperNova detector. The complementary reaction, 64Ni(3He,t)64Cu, was performed at the RCNP, Osaka, by using a 420 MeV 3He beam. The outgoing tritium particles were analyzed by the Grand Raiden Spectrometer and the RCNP detector. By the simplicity of these transitions, the strengths determined in this experimental study are a good tool to check different theoretical models. The model independent Ikeda sum rule could also be checked. Only about 29% of the total predicted strength was found in our study suggesting the necessity of an investigation to higher excitation energies, up to about 50 MeV, that could bring more information. But, as the shape and magnitude of the continuum region is still a matter of study, the experimental estimation of the GT strength in this region and the extraction of the full strength remain a problem. Because the studied nuclei are in fp-shell region, the obtained GT strengths constitute an important input in astrophysics, being required for the theoretical calculations of the rates of electron captures processes taking place in the late stage of the supernovae explosion. Important spectroscopic information was also obtained both for 64Co and 64Cu due to the reaction selectivity and the excellent energy resolution achieved in the two experiments."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Gamow-Teller strength distributions in 64Co and 64Cu studied via the 64Ni(d,2He) and 64Ni(3He, t) reactions"]}]}],"canonical_facts":{"dc:contributor":["De Frenne, D"],"dc:creator":["Popescu, L"],"dc:date":["2005"],"dc:description":["Charge exchange reactions are important tools in the study of spin-isospin excitations in nuclei. For intermediate incident energies and very forward scattering angles, peaks corresponding to Gamow-Teller (GT) transitions are expected to dominate the measured spectra and their cross sections becomes proportional to the transition strength. We performed two different reactions on 64Ni for studying the GT transitions both in + and  directions. For the investigation in + direction, the 64Ni(d,2He)64Co experiment was performed at the KVI, Groningen, by using a 171 MeV deuteron beam. The outgoing 2He particles were analyzed by the Big Bite Spectrometer and the EuroSuperNova detector. The complementary reaction, 64Ni(3He,t)64Cu, was performed at the RCNP, Osaka, by using a 420 MeV 3He beam. The outgoing tritium particles were analyzed by the Grand Raiden Spectrometer and the RCNP detector. By the simplicity of these transitions, the strengths determined in this experimental study are a good tool to check different theoretical models. The model independent Ikeda sum rule could also be checked. Only about 29% of the total predicted strength was found in our study suggesting the necessity of an investigation to higher excitation energies, up to about 50 MeV, that could bring more information. But, as the shape and magnitude of the continuum region is still a matter of study, the experimental estimation of the GT strength in this region and the extraction of the full strength remain a problem. Because the studied nuclei are in fp-shell region, the obtained GT strengths constitute an important input in astrophysics, being required for the theoretical calculations of the rates of electron captures processes taking place in the late stage of the supernovae explosion. Important spectroscopic information was also obtained both for 64Co and 64Cu due to the reaction selectivity and the excellent energy resolution achieved in the two experiments."],"dc:format":["application/pdf"],"dc:identifier":["https://biblio.ugent.be/publication/470704","http://hdl.handle.net/1854/LU-470704","http://doi.org/1854/5255","https://biblio.ugent.be/publication/470704/file/1877880"],"dc:language":["und"],"dc:rights":["info:eu-repo/semantics/openAccess"],"dc:title":["Gamow-Teller strength distributions in 64Co and 64Cu studied via the 64Ni(d,2He) and 64Ni(3He, t) reactions"],"dc:type":["dissertation","info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]},"updated_at":"2026-07-24T02:22:57Z"}