New Short-Lived Isotope<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>221</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>and the Mass Surface Near<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>126</mml:mn></mml:mrow></mml:math>

Khuyagbaatar, J.; Yakushev, A.; Düllmann, Ch. E.; Ackermann, D.; Andersson, L.-L.; Block, M.; Brand, H.; Cox, D. M.; Even, J.; Forsberg, U.; Golubev, P.; Hartmann, W.; Herzberg, R.‐D.; Heßberger, F. P.; Hoffmann, J.; Hübner, A.; Jäger, E.; Jeppsson, J.; Kindler, B.; Kratz, J. V.; Krier, J.; Kurz, N.; Lommel, B.; Maiti, Moumita; Minami, S.; Mistry, A.; Mrosek, Ch M; Pysmenetska, I.; Rudolph, Dirk; Sarmiento, Luis; Schaffner, H.; Schädel, M.; Schausten, Β.; Steiner, J.; Heidenreich, T. Torres De; Uusitalo, J.; Węgrzecki, M.; Wiehl, N.; Yakusheva, V.

doi:10.1103/physrevlett.115.242502

Cited by 80 publications

(34 citation statements)

References 29 publications

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“…This effect is driven by the N=126 neutron shell which corresponds to the 216 Th isotope. New experimental data have shown this shell closure effect at N=126 in Po, Rn, Ra and Th isotopes, with a relaxation in the U ones [66,67]. Calculations of the excitation energy of the 2 + 1 states (the first excited state in this nuclei) using the 5-dimensionnal collective lead to the same conclusion, even though the relaxation effect is not so visible for U isotopes [68,69].…”

Section: A Symmetric and Asymmetric Fission Paths Using Q20 And Q30 mentioning

confidence: 78%

Description of the asymmetric to symmetric fission transition in the neutron-deficient thorium isotopes: Role of the tensor force

et al. 2020

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In the present study, we have investigated the impact of the tensor force on fission paths, in particular the symmetric and asymmetric barriers in 230 Th, 226 Th, 222 Th and 216 Th isotopes which display an asymmetric to symmetric fission transition. This analysis has been performed within the HFB approach with (Q20,Q30,Q40) as collective variable constraints, using the D1ST2a Gogny+tensor term interaction and comparing to the standard D1S Gogny interaction results. The effects from the tensor term on the potential energy surface landscape, and especially on barrier heights and its topology by opening a new valley in agreement with experimental data, are found to be crucial in the description of exotic actinide fission. We conclude that a tensor term should be integrated to the long range part of the effective interaction for a better description of the fission.

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Section: A Symmetric and Asymmetric Fission Paths Using Q20 And Q30 mentioning

confidence: 78%

Description of the asymmetric to symmetric fission transition in the neutron-deficient thorium isotopes: Role of the tensor force

et al. 2020

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“…There have been long-standing experimental interest in conducting nuclear alpha decay studies which not only carry important information on nuclear structure but are also very useful even today for isotope identification via α-decay tagging [105,106,107,108,109,110,111,112,113]. Moreover, the importance of α particle capture reactions (or the inversed α-decay process) for nucleosynthesis has been investigated during a long time.…”

Section: α Decaymentioning

confidence: 99%

“…In addition, the α decays of 114 Ba [175, 176] and light Xe and Te isotopes have also been observed [177,178,179]. An experimental search for 113 Ba was presented recently in Ref. [180].…”

Section: α Decays Of N ∼ Z Nucleimentioning

confidence: 99%

Recent developments in radioactive charged-particle emissions and related phenomena

Liotta

Wyss

2019

Progress in Particle and Nuclear Physics

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The advent and intensive use of new detector technologies as well as radioactive ion beam facilities have opened up possibilities to investigate alpha, proton and cluster decays of highly unstable nuclei. This article provides a review of the current status of our understanding of clustering and the corresponding radioactive particle decay process in atomic nuclei. We put alpha decay in the context of charged-particle emissions which also include one-and two-proton emissions as well as heavy cluster decay. The experimental as well as the theoretical advances achieved recently in these fields are presented. Emphasis is given to the recent discoveries of charged-particle decays from proton-rich nuclei around the proton drip line. Those decay measurements have shown to provide an important probe for studying the structure of the nuclei involved. Developments on the theoretical side in nuclear many-body theories and supercomputing facilities have also made substantial progress, enabling one to study the nuclear clusterization and decays within a microscopic and consistent framework. We report on properties induced by the nuclear interaction acting in the nuclear medium, like the pairing interaction, which have been uncovered by studying the microscopic structure of clusters. The competition between cluster formations as compared to the corresponding alpha-particle formation are included. In the review we also describe the search for super-heavy nuclei connected by chains of alpha and other radioactive particle decays.

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“…In particular, dissipative reaction dynamics plays an essential role in the synthesis of superheavy elements (SHE), a quite appealing challenge of modern nuclear physics [15,[19][20][21][22][23][24][25][26]. The synthesizing process, realized by fusing two heavy nuclei in the laboratory, can be schematically divided into three steps where both nuclear structure and dynamics are important: 1) the two nuclei find each other and their surfaces stick together; 2) the shape of the two nuclei evolves to form a compound nucleus; 3) the evaporation residue survives against statistical fission decay.…”

Section: Introductionmentioning

confidence: 99%

Connecting the nuclear equation of state to the interplay between fusion and quasifission processes in low-energy nuclear reactions

et al. 2018

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Within the Time Dependent Hartree Fock (TDHF) approach, we investigate the impact of several ingredients of the nuclear effective interaction, such as incompressibility, symmetry energy, effective mass, derivative of the Lane potential and surface terms on the exit channel (fusion vs quasifission) observed in the reaction 238 U+ 40 Ca, close to the Coulomb barrier. Our results show that all the ingredients listed above contribute to the competition between fusion and quasifission processes, however the leading role in determining the outcome of the reaction is played by incompressibility, symmetry energy and the isoscalar coefficient of the surface term. This study unravels the complexity of the fusion and quasifission reaction dynamics and helps to understand the microscopic processes responsible for the final outcome of low energy heavy ion collisions in terms of relevant features of the nuclear effective interaction and associated equation of state (EoS).

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New Short-Lived IsotopeU221and the Mass Surface NearN=126

Cited by 80 publications

References 29 publications

Description of the asymmetric to symmetric fission transition in the neutron-deficient thorium isotopes: Role of the tensor force

Description of the asymmetric to symmetric fission transition in the neutron-deficient thorium isotopes: Role of the tensor force

Recent developments in radioactive charged-particle emissions and related phenomena

Connecting the nuclear equation of state to the interplay between fusion and quasifission processes in low-energy nuclear reactions

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