First observation of high-K isomeric states in $$^{249}$$Md and $$^{251}$$Md

6533b7d4fe1ef96bd12628a5

RESEARCH PRODUCT

First observation of high-K isomeric states in $$^{249}$$Md and $$^{251}$$Md

F. Defranchi Bisso P. Jachimowicz Mikael Sandzelius Paul Greenlees Kalle Auranen P. Peura P. Peura Ch. Theisen R.-d. Herzberg R. Julin P. Rahkila T. Grahn M. Vandebrouck J. Skalski A. Drouart Jan Sarén R. Briselet H. Badran H. Badran T. Calverley T. Calverley J. Rubert Joonas Konki Joonas Konki P. Nieminen P. Nieminen Matti Leino B. J. P. Gall Daniel Cox Daniel Cox Daniel Cox A. Ward C. Scholey M. Kowal U. Jakobsson U. Jakobsson M. Airiau F. Déchery Philippos Papadakis Philippos Papadakis Philippos Papadakis Panu Ruotsalainen Jari Partanen Janne Pakarinen Z. Favier Juha Uusitalo T. Goigoux B. Sulignano A. Lopez-martens M. Zielińska K. Hauschild S. Stolze S. Stolze E. Rey-herme A. K. Mistry Juha Sorri Juha Sorri S. Juutinen A. Herzáň A. Herzáň A. Lightfoot

subject

Nuclear and High Energy Physics Nuclear Theory nucl-th [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]isomeria Hadron FOS: Physical sciences [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]nucl-ex 7. Clean energy 01 natural sciences Nuclear Theory (nucl-th)0103 physical sciences Nuclear fusion Nuclear Physics - Experiment Nuclear Experiment (nucl-ex)Nuclear Experiment 010306 general physics Spectroscopy Nuclear Experiment Physics 010308 nuclear & particles physics Fermi surface State (functional analysis)puoliintumisaika Nuclear Physics - Theory Excited state Quasiparticle Atomic physics ydinfysiikka Excitation

description

Decay spectroscopy of the odd-proton nuclei $^{249}$Md and $^{251}$Md has been performed. High-K isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of 2.8(5) ms and an excitation energy $\ge 910$ keV was found in $^{249}$Md. In $^{251}$Md, an isomeric state with a half-life of 1.4(3) s and an excitation energy $\ge 844$ keV was found. Similarly to the neighbouring $^{255}$Lr, these two isomeric states are interpreted as 3 quasi-particle high-K states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen–Cooper–Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods–Saxon potential. The most probable candidates for the configurations of K-isomeric states in Md nuclei are proposed. Decay spectroscopy of the odd-proton nuclei $^{249}$Md and $^{251}$Md has been performed. High-$K$ isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of $2.8(5)$ ms and an excitation energy $\geq 910$ keV was found in $^{249}$Md. In $^{251}$Md, an isomeric state with a half-life of $1.4(3)$ s and an excitation energy $\geq 844$ keV was found. Similarly to the neighbouring $^{255}$Lr, these two isomeric states are interpreted as 3 quasi-particle high-$K$ states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen-Cooper-Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods-Saxon potential. The most probable candidates for the configurations of $K$-isomeric states in Md nuclei are proposed.

year	journal	country	edition	language
2021-07-01	The European Physical Journal A

https://doi.org/10.1140/epja/s10050-021-00631-4