A Neutron Spectrometer for Experiments with Radioactive Beams on the ACCULINNA-2 Fragment Separator

The projectile fragment separator type radioactive ion beam (RIB) facilities, being developed in different laboratories, provide the scope for producing many new exotic nuclei through fragmentation of high energy radioactive ion (RI) beams. A new empirical parametrization for the estimation of cross-sections of projectile fragments has been prescribed for studying the advantages and limitations of high energy RI beams for the production of new exotic nuclei. The parametrization reproduces the experimental data for the production of fragments from neutron-rich projectiles accurately in contrast to the existing parametrization which tends to overestimate the cross-section of neutron-rich fragments in most cases. The modified formalism has been used to compute the cross-sections of neutron-rich species produced by fragmentation of radioactive projectiles (RIBs). It has been found that, given any limit of production cross-section, the exoticity of the fragment increases rather slowly and shows a saturation tendency as the projectile is made more and more exotic. This essentially limits, to an extent, the utility of very neutron-rich radioactive beams vis-a-vis production of new neutron-rich exotic species.

Download Full-text

MEASUREMENT OF TWO-PROTON CORRELATION FROM THE BREAK-UP OF 23Al

International Journal of Modern Physics E ◽

10.1142/s0218301310015400 ◽

2010 ◽

Vol 19 (05n06) ◽

pp. 957-964 ◽

Cited By ~ 3

Author(s):

P. ZHOU ◽

D. Q. FANG ◽

Y. G. MA ◽

X. Z. CAI ◽

J. G. CHEN ◽

...

Keyword(s):

Excited States ◽

Rest Frame ◽

Opening Angle ◽

Proton Emission ◽

Radioactive Beams ◽

Decay Channels ◽

Fragment Separator ◽

Decay Products ◽

Projectile Fragment ◽

Three Body

Experiments of 23 Al and 22 Mg radioactive beams bombarding a 12 C target at an energy of 60 ~70 A MeV have been performed at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility to study the two-proton emission from 23 Al and 22 Mg excited states, respectively. The trajectorie of the decay products, namely 21 Na + p + p from 23 Al and 20 Ne + p + p from 22 Mg , are clean identified. The relative momentum and opening angle between two protons in the rest frame of three body decay channels are obtained by relativistic-kinematics reconstruction. The results demonstrate that there are some di-proton emission components from 2 He cluster for the excited 23 Al and 22 Mg .

Download Full-text

Radioactive Beams for Image-Guided Particle Therapy: The BARB Experiment at GSI

Frontiers in Oncology ◽

10.3389/fonc.2021.737050 ◽

2021 ◽

Vol 11 ◽

Author(s):

Daria Boscolo ◽

Daria Kostyleva ◽

Mohammad Javad Safari ◽

Vasiliki Anagnostatou ◽

Juha Äystö ◽

...

Keyword(s):

Heavy Ion ◽

Ion Beams ◽

Particle Therapy ◽

Radioactive Ion Beams ◽

Radioactive Beams ◽

Fragment Separator ◽

Phase 0 ◽

Heavy Ion Therapy ◽

Ion Therapy ◽

Sufficient Intensity

Several techniques are under development for image-guidance in particle therapy. Positron (β+) emission tomography (PET) is in use since many years, because accelerated ions generate positron-emitting isotopes by nuclear fragmentation in the human body. In heavy ion therapy, a major part of the PET signals is produced by β+-emitters generated via projectile fragmentation. A much higher intensity for the PET signal can be obtained using β+-radioactive beams directly for treatment. This idea has always been hampered by the low intensity of the secondary beams, produced by fragmentation of the primary, stable beams. With the intensity upgrade of the SIS-18 synchrotron and the isotopic separation with the fragment separator FRS in the FAIR-phase-0 in Darmstadt, it is now possible to reach radioactive ion beams with sufficient intensity to treat a tumor in small animals. This was the motivation of the BARB (Biomedical Applications of Radioactive ion Beams) experiment that is ongoing at GSI in Darmstadt. This paper will present the plans and instruments developed by the BARB collaboration for testing the use of radioactive beams in cancer therapy.

Download Full-text

First radioactive beams at ACCULINNA-2 facility and first proposed experiment

EPJ Web of Conferences ◽

10.1051/epjconf/201817703001 ◽

2018 ◽

Vol 177 ◽

pp. 03001 ◽

Cited By ~ 1

Author(s):

A.A. Bezbakh ◽

W. Beekman ◽

V. Chudoba ◽

A.S. Fomichev ◽

M.S. Golovkov ◽

...

Keyword(s):

Focal Plane ◽

Ion Beams ◽

Beam Line ◽

Design Parameters ◽

Radioactive Ion Beams ◽

Fragmentation Reaction ◽

Radioactive Beams ◽

Fragment Separator ◽

Transverse Profile ◽

New Facility

New fragment separator ACCULINNA-2 was installed at the primary beam line of the U-400M cyclotron in 2016. Recently, first radioactive ion beams were obtained. The design parameters of new facility were experimentally confirmed. Intensity, purity and transverse profile of several secondary beams at the final focal plane were studied. The intensities obtained for the secondary beams of 14B, 12Be, 9;11Li, 6;8He in the fragmentation reaction 15N (49.7 AMeV) + Be (2 mm) are in average 15 times higher in comparison to the ones produced at its forerunner ACCULINNA separator. The ACCULINNA-2 separator will become a backbone facility at the FLNR for the research in the field of light exotic nuclei in the vicinity of the nuclear drip lines. The planned first experiment, aimed for the observation of the 7H nucleus at ACCULINNA-2, is outlined.

Download Full-text

2He DECAY FROM EXCITED STATES: THE 18Ne CASE

International Journal of Modern Physics E ◽

10.1142/s021830131101909x ◽

2011 ◽

Vol 20 (04) ◽

pp. 976-979 ◽

Cited By ~ 1

Author(s):

G. RACITI ◽

M. DE NAPOLI ◽

E. RAPISARDA ◽

G. CARDELLA ◽

F. GIACOPPO ◽

...

Keyword(s):

Excited States ◽

Proton Decay ◽

Beam Line ◽

Relative Momentum ◽

Radioactive Beams ◽

Sequential Decay ◽

Fragment Separator ◽

Proton Radioactivity

Two-proton radioactivity studies have been performed on excited states of 18 Ne produced by 20 Ne fragmentation at the FRIBs facility of the Laboratori Nazionali del Sud. The study of the relative-momentum correlations of the two protons allowed to disentangle the diproton, democratic and sequential decay contributions to the 2p emission. In order to extend the study on two-proton decay to other light-masses nuclei, an upgrade of the FRIBs facility is planned. A new configuration of the Fragment Separator would be able to increase the acceptance of the beam line and therefore the yield of the produced radioactive beams. Also the present tagging setup will be modified in view of the gain intensity, in order to sustain the higher foreseen incoming rate. Status and perspectives of the facility will be presented.

Download Full-text