Publications
2021
Lenzi, S. M.; Poves, A.; Macchiavelli, A. O.
Shell model analysis of the B(E2,2+→0+) values in the A=70, T=1 triplet Kr70, Br70, and Se70 Journal Article
In: Physical Review C, 104 (3), 2021, ISSN: 2469-9993.
Abstract | Links | BibTeX | Tags: shell model
@article{2021,
title = {Shell model analysis of the B(E2,2+→0+) values in the A=70, T=1 triplet Kr70, Br70, and Se70},
author = {S. M. Lenzi and A. Poves and A. O. Macchiavelli},
url = {httpdx.doi.org10.1103PhysRevC.104.L031306},
doi = {10.1103physrevc.104.l031306},
issn = {2469-9993},
year = {2021},
date = {2021-09-01},
urldate = {2021-09-01},
journal = {Physical Review C},
volume = {104},
number = {3},
publisher = {American Physical Society (APS)},
abstract = {he transition strengths of the T=1 isobaric triplet Kr, Br, Se, recently measured at RIKEN/RIBF, are discussed in terms of state of the art large scale shell model calculations using the JUN45 and JUN45+LNPS plus Coulomb interactions. In this letter we argue that, depending on the effective charges used, the calculations are either in line with the experimental data within statistical uncertainties, or the anomaly happens in Br, rather than Kr. In the latter case, we suggest that it can be due to the presence of a hitherto undetected 1 T=0 state below the yrast 2 T=1 state. Our results do not support a shape change of Kr with respect to the other members of the isobaric multiplet.},
keywords = {shell model},
pubstate = {published},
tppubtype = {article}
}
he transition strengths of the T=1 isobaric triplet Kr, Br, Se, recently measured at RIKEN/RIBF, are discussed in terms of state of the art large scale shell model calculations using the JUN45 and JUN45+LNPS plus Coulomb interactions. In this letter we argue that, depending on the effective charges used, the calculations are either in line with the experimental data within statistical uncertainties, or the anomaly happens in Br, rather than Kr. In the latter case, we suggest that it can be due to the presence of a hitherto undetected 1 T=0 state below the yrast 2 T=1 state. Our results do not support a shape change of Kr with respect to the other members of the isobaric multiplet.
Kitamura, N.; Wimmer, K.; Poves, A.; Shimizu, N.; Tostevin, J. A.; Bader, V. M.; Bancroft, C.; Barofsky, D.; Baugher, T.; Bazin, D.; Berryman, J. S.; Bildstein, V.; Gade, A.; Imai, N.; Kröll, T.; Langer, C.; Lloyd, J.; Lunderberg, E.; Nowacki, F.; Perdikakis, G.; Recchia, F.; Redpath, T.; Saenz, S.; Smalley, D.; Stroberg, S. R.; Utsuno, Y.; Weisshaar, D.; Westerberg, A.
Coexisting normal and intruder configurations in 32Mg Journal Article
In: Physics Letters B, 822 , pp. 136682, 2021, ISSN: 0370-2693.
Abstract | Links | BibTeX | Tags: 32Mg, Direct reactions, In-beam -ray spectroscopy, Island of inversion, Radioactive beams, shell model
@article{KITAMURA2021136682,
title = {Coexisting normal and intruder configurations in 32Mg},
author = {N. Kitamura and K. Wimmer and A. Poves and N. Shimizu and J. A. Tostevin and V. M. Bader and C. Bancroft and D. Barofsky and T. Baugher and D. Bazin and J. S. Berryman and V. Bildstein and A. Gade and N. Imai and T. Kröll and C. Langer and J. Lloyd and E. Lunderberg and F. Nowacki and G. Perdikakis and F. Recchia and T. Redpath and S. Saenz and D. Smalley and S. R. Stroberg and Y. Utsuno and D. Weisshaar and A. Westerberg},
url = {https://www.sciencedirect.com/science/article/pii/S0370269321006225},
doi = {https://doi.org/10.1016/j.physletb.2021.136682},
issn = {0370-2693},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Physics Letters B},
volume = {822},
pages = {136682},
abstract = {Situated in the so-called “island of inversion,” the nucleus 32Mg is considered as an archetypal example of the disappearance of magicity at N=20. We report on high statistics in-beam spectroscopy of 32Mg with a unique approach, in that two direct reaction probes with different sensitivities to the underlying nuclear structure are employed at the same time. More specifically, states in 32Mg were populated by knockout reactions starting from 33Mg and 34Si, lying inside and outside the island of inversion, respectively. The momentum distributions of the reaction residues and the cross sections leading to the individual final states were confronted with eikonal-based reaction calculations, yielding a significantly updated level scheme for 32Mg and spin-parity assignments. By fully exploiting observables obtained in this measurement, a variety of structures coexisting in 32Mg was unraveled. Comparisons with theoretical predictions based on shell-model overlaps allowed for clear discrimination between different structural models, revealing that the complete theoretical description of this key nucleus is yet to be achieved.},
keywords = {32Mg, Direct reactions, In-beam -ray spectroscopy, Island of inversion, Radioactive beams, shell model},
pubstate = {published},
tppubtype = {article}
}
Situated in the so-called “island of inversion,” the nucleus 32Mg is considered as an archetypal example of the disappearance of magicity at N=20. We report on high statistics in-beam spectroscopy of 32Mg with a unique approach, in that two direct reaction probes with different sensitivities to the underlying nuclear structure are employed at the same time. More specifically, states in 32Mg were populated by knockout reactions starting from 33Mg and 34Si, lying inside and outside the island of inversion, respectively. The momentum distributions of the reaction residues and the cross sections leading to the individual final states were confronted with eikonal-based reaction calculations, yielding a significantly updated level scheme for 32Mg and spin-parity assignments. By fully exploiting observables obtained in this measurement, a variety of structures coexisting in 32Mg was unraveled. Comparisons with theoretical predictions based on shell-model overlaps allowed for clear discrimination between different structural models, revealing that the complete theoretical description of this key nucleus is yet to be achieved.