NAGIOS: RODERIC FUNCIONANDO

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Repositori DSpace/Manakin

Valencià Castellano

Inici
Investigació
e-prints
22 - Física
Visualitza element

IMPORTANT: Aquest repositori està en una versió antiga des del 3/12/2023. La nova instal.lació está en https://roderic.uv.es/

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Mostra el registre parcial de l'element

dc.contributor.author	Domingo Pardo, César
dc.contributor.author	Gadea Raga, Andrés
dc.contributor.author	González Millán, Vicente
dc.contributor.author	Hüyük, Tayfun
dc.contributor.author	Sanchis Peris, Enrique
dc.date.accessioned	2018-05-07T11:44:42Z
dc.date.available	2018-05-07T11:44:42Z
dc.date.issued	2017
dc.identifier.citation	Domingo Pardo, César Gadea Raga, Andrés González Millán, Vicente Hüyük, Tayfun Sanchis Peris, Enrique 2017 Lifetime measurement of neutron-rich even-even molybdenum isotopes Physical Review C 95 3 034320-1 034320-11
dc.identifier.uri	http://hdl.handle.net/10550/66096
dc.description.abstract	Background: In the neutron-rich A approximate to 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method: The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the gamma ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a gamma-ray transition with a known energy. This relativistic Doppler-shift-attenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: tau = 29.7(-9.1)(+11.3) ps for the 4(+) state of Mo-108 and tau = 3.2(-0.7)(+ 0.7) ps for the 6(+) state of Mo-102. Conclusions: The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compared to beyond-mean-field calculations, indicate a gradual shape transition in the chain of molybdenum isotopes when going from A = 100 to A = 108 with a maximum reached at N = 64. The transition probabilities decrease for Mo-108 which may be related to its well-pronounced triaxial shape indicated by the calculations.
dc.language.iso	eng
dc.relation.ispartof	Physical Review C, 2017, vol. 95, num. 3, p. 034320-1-034320-11
dc.subject	Física nuclear
dc.title	Lifetime measurement of neutron-rich even-even molybdenum isotopes
dc.type	journal article	es_ES
dc.date.updated	2018-05-07T11:44:42Z
dc.identifier.doi	10.1103/PhysRevC.95.034320
dc.identifier.idgrec	120321
dc.rights.accessRights	open access	es_ES