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9th SUNFLOWER Workshop
Friday, 28 July 2023 -
09:00
Monday, 24 July 2023
Tuesday, 25 July 2023
Wednesday, 26 July 2023
Thursday, 27 July 2023
Friday, 28 July 2023
09:00
Welcome
-
Marina Petri
Welcome
Marina Petri
09:00 - 09:10
Room: ISA on Campus East, Room 135
09:10
Status of Sunflower
-
Pieter Doornenbal
(
RIKEN
)
Status of Sunflower
Pieter Doornenbal
(
RIKEN
)
09:10 - 09:40
Room: ISA on Campus East, Room 135
09:40
Overview of the HiCARI project at the RIBF
-
Frank Browne
(
RIKEN Nishina Center
)
Overview of the HiCARI project at the RIBF
Frank Browne
(
RIKEN Nishina Center
)
09:40 - 10:20
Room: ISA on Campus East, Room 135
In-beam gamma-ray spectroscopy at the Radioactive Isotope Beam Factory (RIBF), RIKEN, Japan has primarily been carried out in the moderate energy resolution regime using the high-efficiency NaI array DALI2. To perform high-resolution gamma-ray spectroscopy, a high-purity germanium array, known as the HIgh-resolution Cluster Array at the RIBF (HiCARI), was realised at the RIBF. The array comprised six Miniball detectors, two GRETA-type tracking detectors, and four clover detectors sourced from around the world. Three experimental campaigns, exploring many key regions of the nuclear chart, were carried out during 2020 and 2021, yielding excellent preliminary results across a range of physics topics. This talk will provide details of the HiCARI configuration, the physics cases addressed, and some preliminary results from the campaigns.
10:20
Coffee Break
Coffee Break
10:20 - 10:50
Room: ISA on Campus East, Room 135
10:50
Status and Results of NP1612-RIBF149 and NP1712-RIBF162
-
Andrea Jungclaus
(
Instituto de Estructura de la Materia - CSIC
)
Status and Results of NP1612-RIBF149 and NP1712-RIBF162
Andrea Jungclaus
(
Instituto de Estructura de la Materia - CSIC
)
10:50 - 11:20
Room: ISA on Campus East, Room 135
11:20
Coulomb excitation of N=52 isotones towards 100Sn
-
Martha Liliana Cortes
(
RIKEN Nishina Center
)
Coulomb excitation of N=52 isotones towards 100Sn
Martha Liliana Cortes
(
RIKEN Nishina Center
)
11:20 - 11:50
Room: ISA on Campus East, Room 135
Report on the NP1712-RIBF153R1
11:50
Coulomb excitation of the semi-magic nucleus 130Cd
-
He Wang
(
RIKEN
)
Coulomb excitation of the semi-magic nucleus 130Cd
He Wang
(
RIKEN
)
11:50 - 12:20
Room: ISA on Campus East, Room 135
12:20
Lunch Break
Lunch Break
12:20 - 13:30
Room: ISA on Campus East, Room 135
13:30
Evolution of collectivity in the N=50 isotones towards 100Sn
-
Sidong Chen
(
University of York
)
Evolution of collectivity in the N=50 isotones towards 100Sn
Sidong Chen
(
University of York
)
13:30 - 13:50
Room: ISA on Campus East, Room 135
We propose to measure the reduced transition probabilities B(E2; 0+g.s.→2+1) of 96Pd and 98Cd by means of inelastic scattering at intermediate energies. The radioactive 96Pd and 98Cd beams are produced by fragmentation of a 345 MeV/u 124Xe beam on a 9Be target. The isotopes of interest are selected and identified with the BigRIPS separator, then impinged on the secondary target. A Au and a Be secondary targets are used for the inelastic scattering. The gamma-rays emitted from the excited states are measured with the DALI2+ array, and the outgoing particles are identified with the ZeroDegree Spectrometer. The cross sections populating to the 2+1 states on the Au and the Be targets are extracted from the observed gamma-ray intensities. The excitation of the 2+1 state is caused by both the electromagnetic and the nuclear interaction between target and projectile. To extract the reduced transition probability B(E2), reaction model calculations will be performed and the nuclear deformation length and B(E2) value for the projectile nucleus will be adjusted to reproduce simultaneously the measured cross sections on the Au and the Be targets. The 96Pd and 98Cd are only 4 and 2 valence protons below the doubly magic 100Sn. The measurement of this experiment will allow for a detailed comparison of the nuclear structure between the 56-78Ni (Z=28) isotopes versus the 78Ni-100Sn (N=50) isotonic chain, both regions sharing the same p3/2, f5/2, p1/2 and g9/2 orbitals for valence neutrons and protons, respectively. The shell model calculations in the f5/2, p, g9/2 model space in Ref.[1] predict a decrease of collectivity towards the complete occupation of the g9/2 orbitals, with B(E2; 2+1→0+g.s.) value of about 150 e2fm4 for 98Cd. Nevertheless, it is well known that the single-particle d5/2 orbital above the magic number 50 for neutrons and protons, together with the quasi-SU3 partner g9/2 can give rise to collectivity [2]. In Ref.[2], it is suggested that the findings of B. Cederwall and collaborators in 92Pd [3] indicates the necessity to consider the d5/2 orbital above the magic number 50 to describe the nuclei in this region. With the B(E2) measurements of this experiment, the role of the d5/2 orbital in the structure of the nuclei approaching 100Sn will be explored. [1] R. M. Pérez-Vidal, et al., Phys. Rev. Lett. **129**, (2022) 112501 [2] A. P. Zuker, et al., Phys. Rev. C **92**, (2015) 024320 [3] B. Cederwall, et al., Nature (London) **469**, (2011) 69
13:50
Intermediate-energy Coulomb excitation of 94Ru, 96Pd, and 98Cd
-
Liu Xiaoyu
(
The University of Hong Kong
)
Intermediate-energy Coulomb excitation of 94Ru, 96Pd, and 98Cd
Liu Xiaoyu
(
The University of Hong Kong
)
13:50 - 14:10
Room: ISA on Campus East, Room 135
$^{94}$Ru, $^{96}$Pd, and $^{98}$Cd are semi-magic isotones with N=50, and their B(E2;0+ $\to$ 2+) values are still missing or with large uncertainty. We propose an experiment to measure the B(E2;0+ $\to$ 2+) of these isotones by means of intermediate-energy Coulomb excitation. These results will help to verify the seniority scheme in the g9/2 shell. The measurement of $^{98}$Cd will also help us to understand the relatively larger B(E2;0+ $\to$ 2+) observed in $^{102-106}$Sn. In $^{94}$Ru and $^{96}$Pd, it may be possibly to observe Coulomb excitation from the isomeric states.
14:10
Ideas for the next PAC
-
Zoltan Elekes
(
MTA ATOMKI
)
Ideas for the next PAC
Zoltan Elekes
(
MTA ATOMKI
)
14:10 - 14:30
Room: ISA on Campus East, Room 135
The Atomki group would like to propose two ideas for the next PAC. (1) Shape evolution of proton-rich nuclei beyond the N=Z line, (2) study of sulfur and silicon isotopes reaching the neutron drip line. Specifically, we intend to propose to investigate the proton and neutron distribution in 58Zn, 62Ge, and 66Se as well as the matter deformation in 52Ni, 56Zn, and 60Ge. For the neutron-rich nuclei, we plan to map the low-lying states of 46,47,48Si as well as that of the 43,44Si isotopes.
14:30
Coffee Break
Coffee Break
14:30 - 14:50
Room: ISA on Campus East, Room 135
14:50
New Scintillation Array
-
Pieter Doornenbal
(
RIKEN
)
New Scintillation Array
Pieter Doornenbal
(
RIKEN
)
14:50 - 15:20
Room: ISA on Campus East, Room 135
15:20
Discussion
Discussion
15:20 - 16:00
Room: ISA on Campus East, Room 135