volume . 006
July 2009

Dear RIBF users
This is the 6th issue of the RIBF Quarterly with the most up to the minutes information on our RI
Beam Factory.
The past issues are available at our web site : http://www.nishina.riken.jp/UsersGuide/

SHARAQ Launched !
The SHARAQ spectrometer and dispersionmatching beam line have been successfullycommissioned. The spectormeter has been constructed by Univ. of Tokyo, and the beam line
by Nishina Center.
The primary purpose of this spectrometer isspectroscopic studies of nuclei via new exothermic reactions induced by RI beams.
On March 23, 2009 the first beam of 14N at
250A MeV was successfully transported toSHARAQ. In
thesecond
commissioning run in May
2009, lateraland angulardispersion
matching conditions havebeen realized simultaneously. The overall momentum resolution was found to be 1/8000.
On June 30, a ceremony was held to celebrate
the completion of SHARAQ and the success ofthe commissioning runs. Among the invited tothe ceremony were Prof. Arima, two vice presidents of University of Tokyo, and a governor ofRIKEN.
SHARAQ home page : http://www.cns.s.utokyo.ac.jp/sharaq/

Present status, operation schedules of RIBFSuperconducting ECR ion source

BigRIPS related construction

The Superconducting ECR is now on site, and isbeing commissioned. A new beam line connecting
to the RILAC has been completed, and the firstbeam test for this new system will be done in July.
U beam with the intensity of 10 times higher isexpected, which will be provided to a series ofBigRIPS experiments scheduled in November.
In order to provide a stable supply of intense U
beam for users, development of charge strippers
for intense U beam is continuously ongoing.

The installation of the “pillow seal” having aremotely releasable mechanism, which facilitates
maintenance under high residual radiation, will
be done this summer as scheduled. Constructionof additional shielding in these areas will proceed
to reduce heat loads and radiation damages ofthe superconducting quadrupole magnets placeddownstream of the target chamber and the beam
dump. We will be ready to accept intense primarybeam by the end of September.

RILACII installation

Shielding walls between the ZeroDegree
spectrometer and the SAMURAI spectrometer will
be partly installed this summer, in order to make itpossible to construct the SAMURAI spectrometer
independently of beam time scheduling. The walls
are expected to be completed in January 2010.

The fabrication of RILACII is going on asscheduled. Its commissioning will take place inthe next fiscal year. The installation and related
construction at the AVF hall is scheduled fromthe middle of this December till the end of March
2010, which prohibits any experiments using AVF
during this period.
Nishina Center
http://www.nishina.riken.jp/
PAC related
http://www.nishina.riken.jp/UsersGuide/
RIBF User Group
http://ribfwww.riken.go.jp/exp/RIBF_uec_eng/
Beam Time Schedule
http://www.nishina.riken.jp/rarfmt/pc.html
Seminar information
http://rarfaxp.riken.jp/~seminar

After its completion, we will be able to perform
BigRIPS experiments and long-term Super Heavy
Element Search experiments simultaneously.

Nishina Center for Accelerator-Based Science.

.1.

Installation of electron storage ring
The construction of an electron scattering facility
for exotic nuclei in the RIBF building is underway
as scheduled. Construction of shielding walls foran microtron injector and an ISOL facility isalmost completed. The electron ring installation
Toshimi Suda
User Support and Liaison Office
UserSupportOffice@ribf.riken.jp

J u l y2 0 0 9volume . 006

will start from September, and its operation will
the end of this fiscal year.

SUMMER

BigRIPS experiments performed in the last
springJuly 2009

The followings are brief reports on a series ofBigRIPS experiments performed in the period
from mid-April to mid-May. A new acceleration
scheme, AVF+RRC+SRC skipping IRC,was firstexamined.
1) Acceleration of polarized deuteron (NP0702RIBF23 K. Sekiguchi)
The 500 MeV polarized deuteron has beensuccessfully accelerated and extracted from SRC.
Its polarization was confirmed to be 80 % of thetheoretical maximum value. A complete set of
deuteron analyzing power for d+p scattering weredetermined. Related web page is now availableat:,
http://ribf.riken.jp/˜kimiko/RIKEN_Polarized_
Deuteron_Beam/2) Towards spectroscopy of pionic atom via (d,3He)
reaction (RIBF27 K. Itahashi)
The first experiment has been performed toachieve dispersion matching of the beam linefrom the SRC exit to the target, and that of theBigRIPS. Using 250A MeV 14N beam, very good
achromaticity < 0.1 cm/% at the focus F5 wasachieved while keeping large dispersion of 4.5cm/% at the target position (F0). A preliminary
analysis shows the achieved resolving power to beabout 3000.
3) SHARAQ commissioning (T. Uesaka)==> see the top news

4) KAPPA commissioning (T. Kobayashi)
Kappa spectrometer has been commissioned
using 250A MeV 14N primary beam.
Thespectrometer consists of a C-Type magnet, 4
tracking detectors, and hodoscope.
Rigidity
resolution of about 0.5% (rms) at 1.5 GeV/c
was achieved at 1100A excitation. The Kappa
spectrometer is now ready to perform PACapproved (p,2p) and (p,pn) experiments.

Operation Schedule of the second half of
this fiscal year
A tentative operation plan for the period fromOctober 2009 to the end of March 2010, is asfollows:
BigRIPS experiments
Cooling down of all superconducting magnetsof SRC and BigRIPS will start in mid-September.
From mid-October, a series of BigRIPS experiments
will be conducted for nearly two months.
Acceleration test of Xe beam up to SRC comes
first, then a SHARAQ experiment follows. Frommid-November, a series of BigRIPS/ZeroDegree
experiments will be scheduled to run using theprimary beams of U and 48Ca.
The other experiments
As described in “RILACII installation”, a longperiod construction is planned for the AVF hallstaring from mid-December to the end of March.
Therefore, experiments with the AVF-standalone
operation and AVF+RRC will be allocated only forthe period from October to mid-December.
From mid-December to the end of March,experiments using RILAC stand-alone andRILAC + RRC will be allocated. Commissioningof the newly installed GARIS II will be performed
during this period.

Announcement
Beam time requestes
The beam time requests for the latter half of
this fiscal year, from October to March 2010, isbeing called for to all the spokesperson of the PAC
approved experiments. The submission deadlineof the request is July 27.

PAC
Nishina Center
http://www.nishina.riken.jp/
PAC related
http://www.nishina.riken.jp/UsersGuide/
RIBF User Group
http://ribfwww.riken.go.jp/exp/RIBF_uec_eng/
Beam Time Schedule
http://www.nishina.riken.jp/rarfmt/pc.html

The 5th NP PAC was held in June 18 and19. About half of the members have been newly
nominated. A list of new PAC members areavailable in the following web page: (http://www.
nishina.riken.jp/UsersGuide/NP-PAC/).

Seminar information
http://rarfaxp.riken.jp/~seminar

Nishina Center for Accelerator-Based Science.

.2.

The 6th NP PAC will be held in the comingDecember.
The 5th Material and Life Science (ML) PAC will
be held in Sep. 3-4. Proposals to be reviewed in this
PAC is being called for. The submission deadline
is July 31. For further details, please refer thefollowing web pages.
RAL:http://riken.nd.rl.ac.uk/ral/ral_proposal.html
RIBF:http://www.nishina.riken.jp/UsersGuide/
ML-PAC/

Toshimi Suda
User Support and Liaison Office
UserSupportOffice@ribf.riken.jp

A p r i l

2 0 0 9volume . 006
July 2009

SUMMER

User Group Activities
UEC election
The election of new UEC members will be heldin September. According to the RIBF Users Group
Charter, two experimentalists and one theorist
will be newly elected, whose term of office will bethree years. The announcements will soon be sentfrom UEC.
As for the current UEC members, please refer tothe following web page,http://ribfwww.riken.jp/exp/RIBF_uec_eng/
UECmember/UECmember.html

Topics from recent publications
Discovery of large deformation in 62Cr (N.
Aoi et al.)PRL 102, 012502 (2009).

the “Island of Inversion” extends to N=22 for theNe isotopic chain.

The structure of 60Cr and 62Cr has been studied
by proton inelastic scattering at RIPS. The
extracted deformation lengths show evidence forenhanced collectivity in these very neutron-richnuclei.    Observed rapid increase in the energy
ratio of the 4+ state to the 2+ state indicates thedevelopment of large deformation in 62Cr.

This is the first secondary-reaction experimentusing the world’s strongest RI beams produced
from intense primary beam of 48Ca, which is a real
proof of the start of full-scale operation of RIBF.
In the recognition of the above achievement, thepress conference was held at MEXT (Ministry ofeducation, Culture, sports, science and technology)
on July 15.

32

Ne is located inside the Island of Inversion (P. Doonnenbal et al.)Confirmation of great-grand-daughter of278
113; 266Bh (K. Morita et al.)PRL 103, 032501 (2009).

J. Phys. Soc. JPN 78 (2009) 064201.

The first spectroscopic study of the N=22
nucleus 32Ne have been successfully performed
using BigRIPS and ZeroDegree. The excitationenergy of the first 2+ state was determined to be722 keV, and this low excitation energy shows that

The results of 266Bh production experiments
performed from last Dec. to February throughout
the New Year holidays have been published,which strongly support our discovery of the Z=113
element.

Nishina Center
http://www.nishina.riken.jp/
PAC related
http://www.nishina.riken.jp/UsersGuide/
RIBF User Group
http://ribfwww.riken.go.jp/exp/RIBF_uec_eng/
Beam Time Schedule
http://www.nishina.riken.jp/rarfmt/pc.html
Seminar information
http://rarfaxp.riken.jp/~seminar

Nishina Center for Accelerator-Based Science.

.3.

Toshimi Suda
User Support and Liaison Office
UserSupportOffice@ribf.riken.jp

A p r i l

2 0 0 9