β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain

Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around Ni-68 represent an excellent study case, however, spectroscopic information of the neutron-rich, Z < 28 nuclei is limited. Purpose: The goal is to measure gamma-ray...

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Detalles Bibliográficos
Autores: Fraile Prieto, Luis Mario, otros, ...
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/13277
Acceso en línea:https://hdl.handle.net/20.500.14352/13277
Access Level:acceso abierto
Palabra clave:539.1
Nuclear-data sheets
Shape isomerism
Level structure
Isotopes
Spectroscopy
Masses
States
Island
NI-68
NI
Física nuclear
2207 Física Atómica y Nuclear
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oai_identifier_str oai:docta.ucm.es:20.500.14352/13277
network_acronym_str ES
network_name_str España
repository_id_str
spelling β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chainFraile Prieto, Luis Mariootros, ...539.1Nuclear-data sheetsShape isomerismLevel structureIsotopesSpectroscopyMassesStatesIslandNI-68NIFísica nuclear2207 Física Atómica y NuclearBackground: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around Ni-68 represent an excellent study case, however, spectroscopic information of the neutron-rich, Z < 28 nuclei is limited. Purpose: The goal is to measure gamma-ray transitions in Fe-66, Co-66, and Ni-66 populated in the beta-decay of Mn-66 to determine absolute beta feedings and relative gamma-decay probabilities and to compare the results with Monte Carlo shell model calculations in order to study the influence of the relevant single neutron and proton orbital occupancies around Z = 28 and N = 40. Method: The low-energy structures of Fe-65,Fe-66, Co-66, and Ni-66 were studied in the beta(-) decay of Mn-66 produced at ISOLDE, CERN. The beam was purified by means of laser resonance ionization and mass separation. The f and gamma events detected by three plastic scintillators and two MiniBall cluster germanium detectors, respectively, were correlated in time to build the low-energy excitation schemes and to determine the beta-decay half-lives of the nuclei. Results: The relative small beta-decay ground state feeding of Fe-66 obtained in this work is at variant to the earlier studies. Spin and parity 1(+) was assigned to the Co-66 ground state based on the strong ground-state feeding in the decay of Fe-66 as well as in the decay of Co-66. Experimental log(f t) values, gamma-ray de-excitation patterns, and energies of excited states were compared to Monte Carlo shell model calculations. Based on this comparison, spin and parity assignments for the selected number of low-lying states in the Mn-66 to Ni-66 chain were proposed. Conclusions: The beta-decay chain starting Mn-66 toward Ni-66, crossing N = 40, evolves from deformed nuclei to sphericity. The beta-decay population of a selected number of 0(+) and 2(+) states in Ni-66, which is understood within shape coexistence framework of Monte Carlo shell model calculations, reveals the crucial role of the neutron 0g(9/2) shell and proton excitations across the Z = 28 gap.American Physical SocietyUniversidad Complutense de Madrid20182018-12-2820182018-12-28journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/13277reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/132772026-06-02T12:44:21Z
dc.title.none.fl_str_mv β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
title β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
spellingShingle β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
Fraile Prieto, Luis Mario
539.1
Nuclear-data sheets
Shape isomerism
Level structure
Isotopes
Spectroscopy
Masses
States
Island
NI-68
NI
Física nuclear
2207 Física Atómica y Nuclear
title_short β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
title_full β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
title_fullStr β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
title_full_unstemmed β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
title_sort β(-) decay study of the Mn-66-Fe-66-Co-6(6)-Ni-66 decay chain
dc.creator.none.fl_str_mv Fraile Prieto, Luis Mario
otros, ...
author Fraile Prieto, Luis Mario
author_facet Fraile Prieto, Luis Mario
otros, ...
author_role author
author2 otros, ...
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 539.1
Nuclear-data sheets
Shape isomerism
Level structure
Isotopes
Spectroscopy
Masses
States
Island
NI-68
NI
Física nuclear
2207 Física Atómica y Nuclear
topic 539.1
Nuclear-data sheets
Shape isomerism
Level structure
Isotopes
Spectroscopy
Masses
States
Island
NI-68
NI
Física nuclear
2207 Física Atómica y Nuclear
description Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around Ni-68 represent an excellent study case, however, spectroscopic information of the neutron-rich, Z < 28 nuclei is limited. Purpose: The goal is to measure gamma-ray transitions in Fe-66, Co-66, and Ni-66 populated in the beta-decay of Mn-66 to determine absolute beta feedings and relative gamma-decay probabilities and to compare the results with Monte Carlo shell model calculations in order to study the influence of the relevant single neutron and proton orbital occupancies around Z = 28 and N = 40. Method: The low-energy structures of Fe-65,Fe-66, Co-66, and Ni-66 were studied in the beta(-) decay of Mn-66 produced at ISOLDE, CERN. The beam was purified by means of laser resonance ionization and mass separation. The f and gamma events detected by three plastic scintillators and two MiniBall cluster germanium detectors, respectively, were correlated in time to build the low-energy excitation schemes and to determine the beta-decay half-lives of the nuclei. Results: The relative small beta-decay ground state feeding of Fe-66 obtained in this work is at variant to the earlier studies. Spin and parity 1(+) was assigned to the Co-66 ground state based on the strong ground-state feeding in the decay of Fe-66 as well as in the decay of Co-66. Experimental log(f t) values, gamma-ray de-excitation patterns, and energies of excited states were compared to Monte Carlo shell model calculations. Based on this comparison, spin and parity assignments for the selected number of low-lying states in the Mn-66 to Ni-66 chain were proposed. Conclusions: The beta-decay chain starting Mn-66 toward Ni-66, crossing N = 40, evolves from deformed nuclei to sphericity. The beta-decay population of a selected number of 0(+) and 2(+) states in Ni-66, which is understood within shape coexistence framework of Monte Carlo shell model calculations, reveals the crucial role of the neutron 0g(9/2) shell and proton excitations across the Z = 28 gap.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-12-28
2018
2018-12-28
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/13277
url https://hdl.handle.net/20.500.14352/13277
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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