RIBF Week 2018

3 Sept 2018, 09:00 → 7 Sept 2018, 19:00 Asia/Tokyo

RIBF Building, Room 201 (RIKEN Nishina Center)

RIBF Week 2018 is a 5-day long meeting aimed at bringing together a variety of RIBF users to discuss the present status of experiments and generate collaborative efforts for future physics opportunities at the RIBF. To achieve these aims, the RIBF week comprises the following consecutively run events:

3/9-4/9: SAMURAI Workshop,

5/9-6/9: RIBF Users Meeting,

6/9-7/9: SUNFLOWER Workshop.

A dinner shall be held jointly for all three events on the 5th of September at the main canteen of the RIKEN Wako-shi campus. The dinner fee is 2,000 JPY. Those attending the dinner are requested to pay the fee on cash on Wednesday. 

Attendees of RIBF Week are encouraged to take the opportunity to discuss possible inter-group collaborative efforts.

RIBF Users Meeting

The RIBF Users Meeting 2018 organized by the Users Executive Committee will take place on Sep. 5-6.
The meeting will comprise invited overview contributions from experimental and theoretical activities related to the RIBF. Status and future planing of the accelerator facilities will be discussed as well.
The RIBF users group thesis award lectures and award ceremony will be held on Wednesday afternoon.

The registration fee of RIBF Users meeting is 1,000 JPY, to be paid in cash on Wednesday.  

SAMURAI Workshop

The SAMURAI International Collaboration Workshop will be held on September  3-4, 2018. The main aim of the workshop is to summarize the current status of SAMURAI spectrometer, to exchange information on future experimental plans at SAMURAI, and to shape them into proposals for next NP-PAC meetings. Those who are planning to submit a proposal are strongly encouraged to give a presentation at the workshop as well as to submit a pre-proposal to the SAMURAI collaboration. The format is found in: http://ribf.riken.jp/SAMURAI/Collaboration/index.php?CallForProposal

SUNFLOWER Workshop

The 7th SUNFLOWER workshop will take place on  September 6-7, 2018. The meeting's main purpose is to discuss the status and future physics opportunities of in-beam gamma-ray spectroscopy experiments at the RIBF. Participants are encouraged to present reports on the status of past in-beam gamma-ray spectroscopy experiments employing 48Ca, 70Zn, 124Xe, and 238U primary beams. A dedicated session on the SEASTAR project will be held.
Proponents intending to submit a SUNFLOWER proposal to the next RIBF Nuclear Physics Program Advisory Committee, are encouraged to attend the workshop and present their proposal.

Monday 3 September

10:00 → 10:05 Opening remark

Speaker: Takashi Nakamura (Tokyo Institute of Technology)

10:05 → 10:10 Status of RNC

Speaker: Tomohiro Uesaka (RIKEN Nishina Center)

10:10 → 10:50 SAMURAI workshop: Status report 1

10:10 Projects of the Darmstadt Collaborative Research Center at RIBF

I will briefly summarize the projects within the first funding period of the TU Darmstadt Collaborative Research Center "Nuclei: From Fundamental Interactions to Structure and Stars", which have been performed within the SAMURAI collaboration. An outlook towards projects and possible experiments for the next term will be given.

Speaker: Thomas Aumann (Technische Universitaet Darmstadt)

10:30 TBA (NeuLAND)

Speaker: Julian Kahlbow (RIKEN Nishina Center & TU Darmstadt)

10:50 → 11:05 Coffee break

11:05 → 12:05 SAMURAI workshop: Status report 2

11:05 EXPAND/NEBULA+ status

Speaker: Julien GIBELIN (LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France)

11:25 Analysis of multiple neutrons detected with NeuLAND+NEBULA

Speaker: Yosuke KONDO (Tokyo Institute of Technology)

11:45 Invariant-mass spectroscopy of 30F & 29F

The nuclear structure in the “island of inversion“ is dominated by pf-intruder configurations. Recent measurements aimed to find out how far these shell-structure changes extend to the lower Z region. We performed the invariant-mass spectroscopy of 30F and the excited states in 29F, first results will be shown. Two-neutron correlations are also studied in the latter case.

Speaker: Julian Kahlbow (TU Darmstadt)

12:05 → 13:45 Lunch break/board meeting

13:45 → 15:05 SAMURAI workshop: Status report 3

13:45 TBA (SEASTAR)

Speaker: Anna Corsi (CEA Saclay)

14:05 TBA (HI-p)

Speaker: Valerii Panin (RIKEN, Spin-isospin laboratory)

14:25 Status of First Spirit Campaign analyses

The first Spirit campaign successfully measured pion production and collective flow nucleonic flow in 108 Sn+ 112 Sn, 112 Sn+ 124 Sn, 124 Sn+ 112 Sn, and 132 Sn+ 124 Sn collisions at E/A=270 MeV. This talk will discuss the present status of the analyses of this campaign with an outlook towards publication.

Speaker: Prof. William Lynch

14:45 Proton elastic scattering off 6He at 200 A MeV measured with solid polarized proton target

Speaker: Satoshi Sakaguchi (Dept. of Physics, Kyushu University)

15:05 → 15:20 Coffee break

15:20 → 16:50 SAMURAI workshop: New proposals 1

15:20 TBA

Speaker: Masaki Sasano (RIKEN Nishina Center)

15:50 TBA

Speaker: Dr Xiaodong Tang

16:20 TBA

Speaker: Julien GIBELIN (LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France)

16:50 → 17:05 Coffee break

17:05 → 18:25 SAMURAI workshop: Status report 4

17:05 Status of fission study using the (p,2p) reaction in SAMURAI

Speaker: Masaki Sasano (RIKEN Nishina Center)

17:25 TBA (p,n)

Speaker: Laszlo Stuhl (Center for Nuclear Study, University of Tokyo)

17:45 Recent results 16Be, 19B & 28F

We will present recent results on 16Be and 28F, respectively from experiment s018 and s021.

Speaker: Julien GIBELIN (LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France)

18:05 Lifetime Measurement of the $^\text{26}$O g.s. at SAMURAI

A recent experiment suggests that the ground state of the neutron-unbound nucleus $^\text{26}$O could have a lifetime in the pico-second regime. This would constitute the first case of a radioactive decay via neutron emission, if this value can be confirmed.

In Dezember 2016, an experiment using a new measurement method to determine the decay lifetime of the $^\text{26}$O ground state with high sensitivity and precision was performed at SAMURAI. Here, a $^\text{27}$F beam was produced in the fragment separator BigRIPS and impinged on a W/Pt target stack where $^\text{26}$O was produced. According to the lifetime, the decay of $^\text{26}$O happens either in- or outside the target. Thus, the velocity difference between the decay neutrons and the fragment $^\text{24}$O delivers a characteristic spectrum from which the lifetime can be extracted.

The current analysis status will be reported. This work is supported by the DFG through grant no. SFB 1245.

Speaker: Sonja Storck (TU Darmstadt)

Tuesday 4 September

09:00 → 10:20 SAMURAI workshop: Ball session

09:00 CsI(Na) scintillator array CATANA

Speaker: Yasuhiro Togano (Rikkyo University)

09:20 Clustering as a window on the hierarchical structure of quantum systems

Speaker: Takashi Nakamura (Tokyo Institute of Technology)

09:40 Upgrading in-beam gamma-ray spectroscopy at the RIBF

Speaker: Pieter Doornenbal (RIKEN)

10:00 TBA

Speaker: Juzo ZENIHIRO (RIKEN Nishina Center)

10:20 → 10:35 Coffee break

10:35 → 12:05 SAMURAI workshop: New proposals 2

10:35 TBA

Speaker: Hideaki Otsu (RIKEN Nishina Center)

11:05 TBA

Speaker: Dr Daniele Mengoni (University of Padova, INFN)

11:35 TBA

Speaker: Prof. William Lynch

12:05 → 13:35 Lunch break/board meeting

13:35 → 14:35 SAMURAI workshop: New proposals 3

13:35 TBA

Speaker: Junki Tanaka (TU Darmstadt)

14:05 TBA

Speaker: Takashi Nakamura (Tokyo Institute of Technology)

14:35 → 14:50 Coffee break

14:50 → 15:50 SAMURAI workshop: Status report 5

14:50 Study of multi-neutron systems 7H/4n with 8He(p,2p) reaction

Speaker: Zaihong Yang (RIKEN)

15:10 First (p,p alpha) reaction study at RIBF

The Samurai12 experiment has been performed during the last spring campaign. Cluster structure of the ground-state of neutron-rich Beryllium isotopes was investigated using the (p,p alpha) reaction in inverse kinematics. Multineutron spectra should also be accessible from the same data. A brief description of the setup will be given and few preliminary spectra from the (early stage) data analysis will be presented.

Speaker: Didier Beaumel (IPN Orsay / RIKEN Nishina center)

15:30 Status report of the analysis of the $^6$He($p$,$p^{\prime}\alpha$)$^2n$-channel

A status report of the analysis of the $^6$He($p$,$p^{\prime}\alpha$)$^2n$-channel from the S19 experiment in 2017 is given. The alpha-knockout reaction channel can be used to investigate the properties of the dineutron system. Besides the current status, upcoming steps of the further analysis are presented which have to be done to calculate the corresponding relative energy spectrum.

Speaker: Marco Knösel (TU Darmstadt)

15:50 → 16:05 Coffee break

16:05 → 16:45 SAMURAI workshop: Status report 6

16:05 Analysis update on the low-energy dipole response of the halo nuclei $^{6,8}$He

The heaviest bound helium isotopes $^6$He and $^8$He are 2- and 4-neutron halo nuclei with a clear alpha plus 2n and 4n structure. After electromagnetic excitation, they mainly decay via two- and four-neutron emission.
In July 2017, the SAMURAI37 experiment was performed with the purpose of measuring the multi-neutron decay of $^6$He and $^8$He after heavy-ion-induced electromagnetic excitation in complete kinematics to study the dipole response of these nuclei.
The combination of the neutron detectors NEBULA and NeuLAND at the SAMURAI setup and the high beam intensities available at RIBF made this measurement possible for the first time. The experimental method is based on the measurement of the differential cross section via the invariant-mass method, which allows to extract the dipole strength distribution dB(E1)/dE and the photo-absorption cross section. To induce electromagnetic excitation reactions of $^6$He and $^8$He a lead target was used. Additionally a series of targets with increasing Z was used to get precise information about the nuclear contribution to the cross section.
In the talk the status of the ongoing analysis is shown.
This work is supported by the DFG subgrant SFB 1245.

Speaker: Christopher Lehr (TU Darmstadt)

16:25 Status of the Silicon detector used in the S19 experiment

Speaker: Mr Vadim Wagner (TU Darmstadt)

16:45 → 17:45 SAMURAI workshop: Review of beam time

16:45 TBA (18O campaign 2017)

Speaker: Zaihong Yang (RIKEN)

17:05 TBA (18O campaign 2018-1)

Speaker: Valerii Panin (RIKEN, Spin-isospin laboratory)

17:25 TBA (18O campaign 2018-2)

Speaker: Laszlo Stuhl (Center for Nuclear Study, University of Tokyo)

17:45 → 18:05 Closing

Speaker: Takashi Nakamura (Tokyo Institute of Technology)

Wednesday 5 September

09:00 → 09:30 RIBF UEC meeting: Registration

09:30 → 09:35 Opening

Speaker: Kathrin Wimmer (The University of Tokyo)

09:35 → 09:45 Greetings from Director of Nishina Center

Speaker: Hideto En'yo (RNC)

09:45 → 10:55 RIBF UEC meeting: Session 1

Convener: Yutaka Watanabe (KEK)

09:45 Status report on RIBF accelerator operation

Speaker: Nobuhisa Fukunishi (Accelerator Group, Nishina Center for Accelerator-based Science, RIKEN)

09:55 Upgrade and future planning of RIBF accelerator

Speaker: Kazunari Yamada

10:05 Present status of BigRIPS

Speaker: Koichi Yoshida (RIKEN Nishina Center)

10:20 RIBF Beam Time

Speaker: hideki ueno (RNC)

10:35 Discussion

10:55 → 11:20 Coffee break

11:20 → 12:15 RIBF UEC meeting: Session 2

Convener: Yutaka Watanabe (KEK)

11:20 Long Range Plan of RIBF

Speaker: Hiroyoshi Sakurai (RIKEN Nishina Center for Accelerator-Based Science)

11:50 Status of new element search at RNC

Speaker: Kouji Morimoto (GARIS Team)

12:15 → 13:45 Lunch break

13:45 → 14:20 RIBF UEC meeting: Session 3

Convener: Wataru Horiuchi (Hokkaido University)

13:45 Award Ceremony

Speakers: Kathrin Wimmer (The University of Tokyo), Wataru Horiuchi (Hokkaido University)

13:55 Precision spectroscopy of deeply bound pionic states in ^{121, 116}Sn

Speaker: Takahiro Nishi (RIKEN Nishina center)

14:20 → 15:35 RIBF UEC meeting: Session 4

Convener: Tadaaki Isobe (RIKEN)

14:20 A way for synthesizing new elementz Z >= 119 and approaching to Island of Stability

Speaker: Yoshihiro Aritomo (Kindai University)

14:45 MRTOF mass spectrographs at RIBF

Speaker: Michiharu Wada (SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN)

15:10 Present status of SLOWRI

Speaker: Hironobu Ishiyama (RNC)

15:35 → 16:00 Coffee break

16:00 → 17:40 RIBF UEC meeting: Session 5

Convener: Shinsuke Ota (Center for Nuclear Study, University of Tokyo)

16:00 Present status of KISS

Speaker: Yoshikazu HIRAYAMA (IPNS, KEK)

16:25 Current status and prospects of the SCRIT facility

Speaker: Akitomo Enokizono (RIKEN)

16:50 Present status of Rare-RI Ring

Speaker: Yoshitaka Yamaguchi (RIKEN Nishina Center)

17:15 Gauge symmetry breaking and double binding-energy differences

Speaker: Dr Nobuo HINOHARA (Center for Computational Sciences, University of Tsukuba)

18:00 → 20:00 Conference dinner

Thursday 6 September

09:00 → 10:40 RIBF UEC meeting: Session 6

Convener: Takashi Nakamura (Tokyo Institute of Technology)

09:00 Decay Spectroscopy: Status & Future Plan

Speaker: Shunji Nishimura (RIKEN Nishina Center)

09:25 Nuclear Reaction Data of Long-Lived Fission Product at RIBF

Speaker: Hideaki Otsu (RIKEN Nishina Center)

09:50 Activity report of OEDO 2017/2018

Speaker: Nobuaki IMAI (CNS, Univ. of Tokyo)

10:15 Activities at the low-energy RI beam separator CRIB

Speaker: Hidetoshi Yamaguchi (CNS, the University of Tokyo)

10:40 → 11:05 Coffee break

11:05 → 12:20 RIBF UEC meeting: Session 7

Convener: Kathrin Wimmer (The University of Tokyo)

11:05 Recent experiments at SAMURAI and its perspectives

Speaker: Takashi Nakamura (Tokyo Institute of Technology)

11:30 SUNFLOWER Status Report

Speaker: Pieter Doornenbal (RIKEN)

11:55 UEC Report & Closing

Speaker: Kathrin Wimmer (The University of Tokyo)

12:20 → 14:00 Lunch break

14:00 → 15:40 SUNFLOWER workshop: Session 1: General overview

14:00 Welcome and Introduction

Speaker: Hiroyoshi Sakurai (RIKEN Nishina Center for Accelerator-Based Science)

14:10 Overview of Sunflower

Speaker: Pieter Doornenbal (RIKEN)

14:40 Results and perspectives with MINOS at RIBF

Speaker: Anna Corsi (CEA Saclay)

15:10 Current status of the development of a tracking Ge detector in Japan

Speaker: Nori AOI (RCNP, Osaka Univ.)

15:40 → 16:00 Coffee break

16:00 → 18:00 SUNFLOWER workshop: Session 2: Future possibilities

16:00 Recent developments towards a new scintillator array at RIBF using GAGG detectors

Speaker: Martha Liliana Cortes (RIKEN Nishina Center)

16:30 Towards a High Resolution Campagin at the RIBF

Speaker: Pieter Doornenbal (RIKEN)

17:00 Analysis of Coulomb excitation experiments at the RIBF

Speaker: Kathrin Wimmer (The University of Tokyo)

17:30 Fall 2018 beam time overview

Speaker: Martha Liliana Cortes (RIKEN Nishina Center)

Friday 7 September

09:30 → 10:40 SUNFLOWER workshop: Session 3: SEASTAR 1 and SEASTAR 2

09:30 First spectroscopy of 78Ni

Speaker: Ryo Taniuchi (Department of Physics, Graduate School of Science, The University of Tokyo)

09:50 Oblate and triaxial structures in the A~90 region and first news on odd-A Sc isotopes

Speaker: Volker Werner (Yale University)

10:10 In-beam gamma Spectroscopy in HKU

Speaker: Sidong Chen (the University of Hong Kong)

10:40 → 11:10 Coffee break

11:10 → 12:10 SUNFLOWER workshop: Session 4: SEASTAR 3

11:10 Structure of 50Ar from one-nucleon removal: spectroscopy of 49Cl and 49Ar

Speaker: Duy Linh Bui (INST, VINATOM Vietnam)

11:30 First spectroscopy of 62Ti

Speaker: Martha Liliana Cortes (RIKEN Nishina Center)

11:50 In-beam gamma-ray spectroscopy of 53,56Ca

Speaker: Dr Sidong Chen (the University of Hong Kong)

12:10 → 14:00 Lunch break

14:00 → 15:35 SUNFLOWER workshop: Session 5: Past and future experiments

14:00 TBA

Speaker: Michiharu Wada (SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN)

14:15 Status of Analysis and Interpretation of 40Mg

Speaker: Heather Crawford (Lawrence Berkeley National Laboratory)

14:35 Survey for triaxiality in Ge isotopes

Speaker: Volker Werner (Yale University)

14:55 Asymmetric dynamics around the magic octupole numbers Z=34 and N=54

Speaker: Frank Browne (RIKEN Nishina Center)

15:15 Discussion and closing

Speaker: Pieter Doornenbal (RIKEN)