Call for Proposals of Nuclear-Physics Experiments
at RI Beam Factory
September 11, 2023
Hiroyoshi Sakurai
Director of RIKEN Nishina Centerfor Accelerator-Base Science

Yasuhiro Sakemi

Naohito Saito

Director of Center for Nuclear Study,

Director of Institute of

the University of Tokyo

Particle and Nuclear Studies, KEK

This is a call for proposals for nuclear-physics experiments at the RI Beam Factory (RIBF) in the
RIKEN Nishina Center for Accelerator-Based Science (RNC). The Program Advisory Committee(PAC) will review all nuclear physics proposals for the RIBF facilities, including SHARAQ andCRIB operated by the Center for Nuclear Study (CNS), the University of Tokyo, and KISS
operated by Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies(IPNS), KEK. The review will be made based on their scientific merits and feasibility. The PAC
constituted by international members submits its recommendations to the Directors of RNC, CNS,and IPNS.
Since the date of the 24th PAC meeting has been set for December 5–7, 2023, we are now callingfor proposals to be discussed at the 24th PAC meeting. All the spokespersons of the submitted
proposals are requested to attend the PAC meeting. The meeting is held in person, and oralpresentations and Q&A sessions will take place in the meeting. Direct visit of spokespersons to theRIKEN campus is desirable, but for the case your visit to the RIKEN campus is difficult, online
participation via Zoom is also available. For each submitted proposal, specific PAC members will
be assigned to review the proposal in detail prior to the PAC meeting. The PAC members may
contact the spokesperson prior to the meeting.
In principle, approved experiments are expected to be completed within two years. If an experimentdoes not finish within 4 years, a request for an extension or a new experimental proposal must besubmitted.
We call for the following types of proposals:
1. Nuclear physics experiments at the RIBF accelerator facility

2. Updates of previously approved proposals
3. Development of experimental equipment that requires beam-time use
4. Construction of large-size instruments, such as a spectrometer, whose design study has
been completed (Note: the 4-year rule does not apply to proposals of this type).
Please note that the use of the RIBF facility must be limited to non-military purposes.
Item 2 is for those who wish to make significant updates to their proposals. One can submit theupdated version of the previously approved proposal, so that the PAC will review the proposal
again. One should consider resubmission of the updated proposal if one of the following two cases
applies:i)

The approved experiment will be run by using a primary beam which is different from thatin the original proposal.
ii) The priority granted to the approved proposal is not high enough, and the spokesperson
aims at raising its priority. In particular, to be graded as S or A, spokespersons of proposals
previously approved as B or A/B are encouraged to resubmit appropriately revised
proposals.
The updated proposal should contain clear statements of what updates have been made in the
proposal, including any change that may affect the physics aspects. Our tentative two-year plan ofprimary beams for BigRIPS-based experiments is as follows:
In 2024:
In 2025:

238

U + (124Xe, 78Kr, 70Zn, light ions)(to be decided)

This beam plan is subject to change depending on the situations of the utility power, beamdevelopment, and status of the accelerator operation. The 48Ca beam will be unavailable until the48
Ca ion source material becomes ready. The 208Pb beam will not be available until the ion source
upgrade is completed.
A new type of proposal, called “proposals for scientific program”, has been started in the 13th PAC
meeting. This category is for project-type experiments, such as surveying a broad range of nuclei
for specific physics quantities with a certain detector setup. A collaboration led by RIKEN withpartner institutes which, for example, introduce an experimental device to facilitate themeasurements of interest, can initiate this category of proposal. Please contact one of the groupdirectors of Radioactive Isotope Physics group, Nuclear Structure Research group, and Nuclear
Dynamics Research group if you are interested in this category.
The submitted proposal must contain (i) a cover sheet, (ii) a detailed description of the proposed
experiment or construction, and (iii) a GDPR consent letter (for EU applicants). The main part ofthe proposal must be within 10 pages (cover sheet not included). Appendices can be added toprovide supplementary information. Those who propose experiments with BigRIPS are alsorequested to submit (iii) a LISE++ input file describing the secondary-beam setting in yourproposal. For (i) and (iii), please use the latest versions available at:
http://www.nishina.riken.jp/RIBF/NP-PAC/index.html .
Detailed information on the experiment or construction can be given in a free format, and must besubmitted with the cover sheet attached as the first page. It should include the following
description:
1.
2.
3.
4.

Goals and methods of the proposed experiment or proposed development
Setup and conditions
Estimation of beam time requested
Readiness

Information on the facility, including the list of the available primary beams and the latest
secondary-beam production cross sections, is given on the RIBF web page:
http://www.nishina.riken.jp/RIBF .
The deadline for proposal submission is October 10, 2023. Submission or replacement ofsubmitted documents after the deadline will not be accepted.
The following is a list of contact persons of the experimental equipment and detectors. Those whoplan to use the following equipment and/or detectors are requested to get in touch with the contact
persons prior to the proposal submission.
Equipment
 GARIS : RIPS : BigRIPS :Kouji Morimoto(morimoto@riken.jp)
Aiko Takamine(icot@riken.jp)
RI beam production group, BigRIPS team(rib-production@ribf.riken.jp)
 ZeroDegree : Daisuke Suzuki(daisuke.suzuki@ribf.riken.jp)
 SHARAQ :Kentaro Yako
(yako@cns.s.u-tokyo.ac.jp)
 OEDO
Nobuaki Imai(n.imai@cns.s.u-tokyo.ac.jp)
 SAMURAI :Hideaki Otsu
(otsu@ribf.riken.jp)
 Rare RI Ring : Yoshitaka Yamaguchi(yamaguch@ribf.riken.jp)
 CRIB :Hidetoshi Yamaguchi (yamag@cns.s.u-tokyo.ac.jp)
 KISS :Yoshikazu Hirayama(yoshikazu.hirayama@kek.jp)
Detectors
 DALI2 :Pieter Doornenbal(pieter@ribf.riken.jp)
 GRAPE :Nobuaki Imai(n.imai@cns.s.u-tokyo.ac.jp)

The personal information given in the submitted proposal will be used for the PAC evaluation
purpose only. Please note that the proposal title, name, and affiliation of the spokesperson willappear in the program of the NP-PAC meeting on the Nishina Center web site and other documents
relevant to the PAC meeting.
Proposals should be sent through the following uploader:https://riken-share.ent.box.com/f/f001c68c34d24e11b96c51afaef08cfa
Please include your name in the filename of the submitted files, and email a short note that you
submitted your proposal to:
Dr. Ken-ichiro Yoneda
RIBF Users Office
Email :UserSupportOffice@ribf.riken.jp .
In case the uploader does not work in your environment, please send your files as emailattachments to:
24th_NP.3pawdovuloeo3k09@u.box.com
Key dates:
Issuance of this Call for Proposals: September 11, 2023
Deadline of proposal submission: October 10, 2023
24th NP-PAC meeting:
December 5 – 7, 2023