Ⅱ-1. Nuclear Physics

RIKEN Accel. Prog. Rep. 49 (2016)

RIRI beam
beam production
productionat
at BigRIPSBigRIPS inin 2015
2015
Y. Shimizu,*1 N. Fukuda,*1 H. Takeda,*1 H. Suzuki,*1 D.S. Ahn,*1 T. Sumikama,*1 D. Murai,*1,*2 N. Inabe,*1T. Komatsubara,*1 K. Kusaka,*1 M. Ohtake,*1 Y. Yanagisawa,*1 K. Yoshida,*1 and T. Kubo*1110Zr, 100Kr, 94Se, 88Ge, and 84Zn. The polarized 2H beam
experiment was performed to investigate the three nucleon
force. The 78Kr primary beam was provided for the firsttime. We have measured the production yields and theproduction cross sections for a variety of RI beams
produced by projectile fragmentation of the 78Kr beam2).
Highly proton-rich isotopes, such as 67Kr, 63Se, and 59Ge,
from the 78Kr beam were delivered to the EURICA
experiments. Search for new proton-rich isotopes wasperformed. The spring beam time ended with the Rare RI
Ring commissioning using the 78Kr primary beam.

The radioactive isotope (RI) beam production at theBigRIPS fragment separator1) in 2015 is presented. Table 1
summarizes the experimental programs that involved theuse of the BigRIPS separator in this period and the RIbeams produced for each experiment.
The first uranium beam time started in March with theImPACT program at the ZeroDegree spectrometer. To study
the nuclear-transmutation reaction for the long-lived fission
products, 135Cs, 108,107Pd, 94,93Zr, and 90Sr were produced by
the in-flight fission of the 238U beam. The SEASTAR
campaign were performed to measure E(21+) energies ofTable 1. List of experimental programs together with RI beams produced at the BigRIPS separator in 2015.
Primary beam (Period)
238

U
345 MeV/nucleon(Mar. 26 – May 8)
2H
190 MeV/nucleon(May 12 – May 16)
78Kr
345 MeV/nucleon(May 24 – Jun. 22)

238

U345 MeV/nucleon(Oct. 20 – Nov. 14)

48Ca
345 MeV/nucleon(Nov. 19 – Dec. 4)*1*2

Proposal No.
IMPACT14-01
NP1406-RIBF126
NP1306-RIBF98R1MS-EXP15-03
MS-EXP15-02
NP1312-RIBF18R1 (SEASTAR)
PE15-01

CourseZeroDegree
ZeroDegree
ZeroDegree
BigRIPSBigRIPS
ZeroDegree
ZeroDegree

NP1112-RIBF65-02

BigRIPS

NP1112-RIBF94-02
NP0702-RIBF4R1
NP1112-RIBF82
NP1112-RIBF93
DA14-02-04
MS-EXP15-04
MS-EXP15-01
IMPACT15-01
MS-EXP15-06
MS-EXP15-07
MS-EXP15-08
MS-EXP15-09
NP1412-RIBF124R1
NP1306-RIBF99
MS-EXP15-10
MS-EXP15-11
NP1312-SAMURAI21
MS-EXP15-12

ZeroDegree
EURICAEURICAEURICABigRIPS
Rare RI Ring
ZeroDegree
SAMURAISAMURAISAMURAIBigRIPSBigRIPS
F8
F8BigRIPSSAMURAISAMURAI
Rare RI Ring

RIKEN Nishina Center
Department of Physics, Rikkyo University- 66 -RI beams
Cs, 108,107Pd, 94,93Zr, 90Sr
77,73
Cu136
Te132
Sn132
Sn135

111

2Nb, 101Rb, 95Br, 89As, 85Ga

H (primary beam)

72,70

Kr
Kr, 63Se, 59Ge, 51Ni
66,64
Se, 60Ge
71,70
Kr59
Ge78
Kr (primary beam)212
Ra, 136Sn
67

94,93

132

Zr, 80,79Se

SnSn76
Zn99Zr48
Ca (primary beam)1
H
29Ne, 29F, 24O, 20F
38K132

Ⅱ-1. Nuclear Physics

RIKEN Accel. Prog. Rep. 49 (2016)

performed so far. Figure 1 shows the RI beams produced at
the BigRIPS separator from March 2007 to December 2015
on the table of the nuclides. The number of RI beams
produced at the BigRIPS separator amounted to about 400.
The number of new isotopes reached about 140. Production
yields for more than 1400 RI beams have been measured.

The second uranium beam time started in October withthe ImPACT program at the SAMURAI spectrometer. Amachine study was conducted to investigate particle
identification and isotope separation in the region aroundatomic number Z = 883). 29Ne and 29F were produced byprojectile fragmentation of a 48Ca beam to study resonancestates of the neutron-rich oxygen isotopes 27,28O using theSAMURAI spectrometer. The autumn beam time ended
with the Rare RI Ring experiment using the 38K RI beam.
The number of the experiments using the RI beams at theBigRIPS separator is tallied in Table 2, for various primarybeams in each year. A total of 115 experiments have been

References
1) T. Kubo: Nucl. Instr. Meth. B 204, 97 (2003).
2) H. Suzuki et al.: In this report.
3) T. Sumikama et al.: In this report

Table 2. Number of experiments performed using RI beams in each year.
Year

238

2007
2008
2009
2010
2011
2012
2013
2014
2015
Total

423

U464
111549

124

Xe86

Kr

78

Kr70

Zn

1

1

Ca

4310232748

66

1

4

13428

218

O

1
2
63
12

16

O

14

N

324He

1

1
1

5

12H

1113

Fig. 1. RI beams produced at the BigRIPS separator from March 2007 to December 2015.

- 67 -Yearly
total
56
10
14
820
91726115