6533b86ffe1ef96bd12cdd7e

RESEARCH PRODUCT

Effects of one valence proton on seniority and angular momentum of neutrons in neutron-rich $^{122-131}$Sb$_{51}$ isotopes

S. BiswasA. LemassonM. RejmundA. NavinY.h. KimC. MichelagnoliI. StefanR. BanikP. BednarczykS. BhattacharyaS. BhattacharyyaE. ClémentH.l. CrawfordG. De FranceP. FallonG. FrémontJ. GoupilB. JacquotH.j. LiJ. LjungvallA. MajL. MénagerV. MorelR. PalitR.m. Pérez-vidalJ. RopertD. BarrientosG. BenzoniB. BirkenbachA.j. BostonH.c. BostonB. CederwallJ. ColladoD.m. CullenP. DésesquellesC. Domingo-pardoJ. DudouetJ. EberthV. GonzálezL.j. Harkness-brennanH. HessA. JungclausW. KortenM. LabicheA. LefevreR. MenegazzoD. MengoniB. MillionD.r. NapoliA. PulliaB. QuintanaD. RaletF. RecchiaP. ReiterF. SaillantM.d. SalsacE. SanchisO. StezowskiCh. TheisenJ.j. Valiente-dobónM. Zielińska

subject

Nuclear Theorynucl-th[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]Astrophysics::High Energy Astrophysical PhenomenaNuclear TheoryFOS: Physical sciences[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]nucl-exNuclear StructureNuclear Theory (nucl-th)Nuclear Physics - TheoryNuclear Physics - ExperimentNuclear Experiment (nucl-ex)Nuclear ExperimentNuclear Experiment

description

The neutron-rich $^{122-131}$Sb isotopes were produced as fission fragments in the reaction $^{9}$Be($^{238}$U,~f) with 6.2 MeV/u beam energy. An unique setup, consisting of AGATA, VAMOS++ and EXOGAM detectors, was used which enabled the prompt-delayed gamma-ray ($\gamma$) spectroscopy of fission fragments in the time range of 100 ns - 200 $\mu$s. New isomers, prompt and delayed transitions were established in the even-A $^{122-130}$Sb isotopes. In the odd-A $^{123-131}$Sb isotopes, new prompt and delayed $\gamma$-ray transitions were identified, in addition to the confirmation of the previously known isomers. The half-lives of the isomeric states and the $B(E2)$ transition probabilities of the observed transitions depopulating these isomers were extracted. The experimental data was compared with the theoretical results obtained in the framework of Large-Scale Shell-Model (LSSM) calculations in a restricted model space. Modifications of several components of the shell model interaction were introduced to obtain a consistent agreement with the excitation energies and the $B(E2)$ transition probabilities in neutron-rich Sn and Sb isotopes. The isomeric configurations in Sn and Sb were found to be relatively pure. Further, the calculations revealed that the presence of a single valence proton, mainly in the $g_{7/2}$ orbital in Sb isotopes, leads to significant mixing (due to the $\nu\pi$ interaction) of: (i) the neutron seniorities ($\upsilon_{\nu}$) and (ii) the neutron angular momentum ($I_{\nu}$). The above features have a weak impact on the excitation energies, but have an important impact on the $B(E2)$ transition probabilities. In addition, a constancy of the relative excitation energies irrespective of neutron seniority and neutron number in Sn and Sb was observed.

10.1103/physrevc.99.064302https://hal.archives-ouvertes.fr/hal-02154730