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	Author	Navin, A. et al; Perez-Vidal, R.M.
	Title	Level structure of light neutron-rich La isotopes beyond the N=82 shell closure			Type	Journal Article
	Year	2025	Publication	Physical Review C	Abbreviated Journal	Phys. Rev. C
	Volume	112	Issue	4	Pages	044310 - 16pp
	Keywords
	Abstract	The high spin excited states of Lanthanum isotopes 140-143La, above the N = 82 closed shell, were populated in fission reactions. The prompt gamma-ray transitions were measured using two complementary methods: (a) in coincidence with the isotopically identified fragments produced in the fission of the 238U +9Be system using the Variable Mode Spectrometer (VAMOS++) and the Advanced Gamma Tracking Array (AGATA) spectrometer, and (b) high statistics threefold gamma-gamma-gamma and fourfold gamma-gamma-gamma-gamma coincidence data from the spontaneous fission of 252Cf using the Gammasphere. This work reports the first identification of a pair of parity doublet structures in 143La and the new high spin level structure in 140-142La from prompt gamma-ray spectroscopy. The level structures are interpreted in terms of the systematics of neighboring odd-Z nuclei above the Z = 50 shell closure and large-scale shell model calculations. The present results indicate the presence of stable octupole deformation in 143La. The excitation energy pattern and their comparison with neighboring isotones, moving away from the N = 82 closed shell, point towards a transition from single-particle structures to an alternating parity rotational band structure in the La isotopic chain.
	Address	[Navin, A.; Rejmund, M.; Lemasson, A.; Biswas, S.; Michelagnoli, C.; Bednarczyk, P.; Clement, E.; de France, G.; Fremont, G.; Goupil, J.; Jacquot, B.; Li, H. J.; Menager, L.; Morel, V; Ropert, J.; Schmitt, C.] CEA, GANIL, DRF, CNRS,IN2P3, Blvd Henri Becquerel,BP 55027, F-14076 Caen 5, France, Email: navin@ganil.fr;
	Corporate Author				Thesis
	Publisher	Amer Physical Soc	Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	2469-9985	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001603998600006			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6917
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