Quadrupole collectivity in neutron-rich Cd isotopes

S. Boenig, Th Kroell, S. Ilieva, M. Scheck

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The proximity to the closed shells at Z = 50 and N = 82 makes the neutron-rich Cd isotopes a perfect test case for nuclear theories. The energy of the first excited 2(+)-state in the even Cd122-128 shows an irregular behaviour as the Cd isotopes exhibit only a slight increase for Cd-122 to Cd-126 and even a decrease from Cd-126 to Cd-128. This anomaly can so far not be reproduced by shell model calculations. Only beyond mean field calculations with a resultant prolate deformation are capable to describe this anomalous behaviour. In order to gain more information about the neutron-rich Cd isotopes a Coulomb excitation experiment was performed with MINIBALL at REX-ISOLDE, CERN. The extracted transition strengths B(E2, 0(gs)(+) -> 2(1)(+)) for Cd-122,Cd-124,Cd-126,Cd-128 agree with beyond mean field calculations. The spectroscopic quadrupole moments Q(s) (2(1)(+)) are compared with measurements on odd neutron-rich Cd isotopes.
Original languageEnglish
Title of host publication11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES
EditorsA Gargano, L Coraggio, N Itaco
PublisherIOP Publishing
Volume580
DOIs
Publication statusPublished - 2015

Publication series

NameJournal of Physics Conference Series
PublisherIOP Publishing
ISSN (Print)1742-6588

Cite this

Boenig, S., Kroell, T., Ilieva, S., & Scheck, M. (2015). Quadrupole collectivity in neutron-rich Cd isotopes. In A. Gargano, L. Coraggio, & N. Itaco (Eds.), 11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES (Vol. 580). [012023] (Journal of Physics Conference Series). IOP Publishing. https://doi.org/10.1088/1742-6596/580/1/012023
Boenig, S. ; Kroell, Th ; Ilieva, S. ; Scheck, M. / Quadrupole collectivity in neutron-rich Cd isotopes. 11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES. editor / A Gargano ; L Coraggio ; N Itaco. Vol. 580 IOP Publishing, 2015. (Journal of Physics Conference Series).
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Boenig, S, Kroell, T, Ilieva, S & Scheck, M 2015, Quadrupole collectivity in neutron-rich Cd isotopes. in A Gargano, L Coraggio & N Itaco (eds), 11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES. vol. 580, 012023, Journal of Physics Conference Series, IOP Publishing. https://doi.org/10.1088/1742-6596/580/1/012023

Quadrupole collectivity in neutron-rich Cd isotopes. / Boenig, S.; Kroell, Th; Ilieva, S.; Scheck, M.

11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES. ed. / A Gargano; L Coraggio; N Itaco. Vol. 580 IOP Publishing, 2015. 012023 (Journal of Physics Conference Series).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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T1 - Quadrupole collectivity in neutron-rich Cd isotopes

AU - Boenig, S.

AU - Kroell, Th

AU - Ilieva, S.

AU - Scheck, M.

PY - 2015

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N2 - The proximity to the closed shells at Z = 50 and N = 82 makes the neutron-rich Cd isotopes a perfect test case for nuclear theories. The energy of the first excited 2(+)-state in the even Cd122-128 shows an irregular behaviour as the Cd isotopes exhibit only a slight increase for Cd-122 to Cd-126 and even a decrease from Cd-126 to Cd-128. This anomaly can so far not be reproduced by shell model calculations. Only beyond mean field calculations with a resultant prolate deformation are capable to describe this anomalous behaviour. In order to gain more information about the neutron-rich Cd isotopes a Coulomb excitation experiment was performed with MINIBALL at REX-ISOLDE, CERN. The extracted transition strengths B(E2, 0(gs)(+) -> 2(1)(+)) for Cd-122,Cd-124,Cd-126,Cd-128 agree with beyond mean field calculations. The spectroscopic quadrupole moments Q(s) (2(1)(+)) are compared with measurements on odd neutron-rich Cd isotopes.

AB - The proximity to the closed shells at Z = 50 and N = 82 makes the neutron-rich Cd isotopes a perfect test case for nuclear theories. The energy of the first excited 2(+)-state in the even Cd122-128 shows an irregular behaviour as the Cd isotopes exhibit only a slight increase for Cd-122 to Cd-126 and even a decrease from Cd-126 to Cd-128. This anomaly can so far not be reproduced by shell model calculations. Only beyond mean field calculations with a resultant prolate deformation are capable to describe this anomalous behaviour. In order to gain more information about the neutron-rich Cd isotopes a Coulomb excitation experiment was performed with MINIBALL at REX-ISOLDE, CERN. The extracted transition strengths B(E2, 0(gs)(+) -> 2(1)(+)) for Cd-122,Cd-124,Cd-126,Cd-128 agree with beyond mean field calculations. The spectroscopic quadrupole moments Q(s) (2(1)(+)) are compared with measurements on odd neutron-rich Cd isotopes.

U2 - 10.1088/1742-6596/580/1/012023

DO - 10.1088/1742-6596/580/1/012023

M3 - Conference contribution

VL - 580

T3 - Journal of Physics Conference Series

BT - 11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES

A2 - Gargano, A

A2 - Coraggio, L

A2 - Itaco, N

PB - IOP Publishing

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Boenig S, Kroell T, Ilieva S, Scheck M. Quadrupole collectivity in neutron-rich Cd isotopes. In Gargano A, Coraggio L, Itaco N, editors, 11TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS: SHELL MODEL AND NUCLEAR STRUCTURE - ACHIEVEMENTS OF THE PAST TWO DECADES. Vol. 580. IOP Publishing. 2015. 012023. (Journal of Physics Conference Series). https://doi.org/10.1088/1742-6596/580/1/012023