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1.
P. Bricault 《The European physical journal. Special topics》2007,150(1):227-232
The ISAC facility at TRIUMF utilizes up to 100 μA from the 500 MeV H- cyclotron to produce the RIB using the Isotopic Separation On Line (ISOL) method. The ISAC-I facility comprised the RNB production
target stations, the mass separator and the beam delivery to low energy area and to a room temperature linear accelerator
composed of a 4-rod RFQ and an inter-digital H type structure Drift Tube LINAC. ISAC-I linear accelerator can provide beam
from A = 3 to 30 amu with an energy range from 0.15 to 1.5 A MeV.
Since the beginning of operations target development program has been to increase proton beam currents on targets. Now we
routinely operate our target at 50 to 85 μA and recently we have operated our target at 100 μA. Other developments are in
place to add other ion sources, laser, FEBIAD and ECRIS to the actual surface ion source. The last two five year plans were
mainly devoted to the construction of a heavy ion superconducting LINAC (ISAC-II), that will upgrade the mass and the energy
range from 30 to 150 and 1.5 to 6.5 A MeV, respectively.
We are now commissioning the medium β section and first experiment is scheduled for the fall 2006. 相似文献
2.
The scattering problem of the
system, in the standard non-relativistic quark model of Isgur-Karl, is solved for the first time, by treating the large five-body
model space, including the NK scattering channel, accurately with the Gaussian expansion method and the Kohn-type coupled-channel variational method. The
calculated NK scattering phase shift shows no resonance in the energy region of the reported pentaquark Θ+(1540) that is, at 0–500 MeV above the NK threshold (1.4–1.9 GeV in mass). The phase shift does show two resonances just above 500 MeV: a broad
+ resonance with a width of Γ ∼ 110 MeV located at ∼ 520 MeV (∼ 2.0 GeV in mass) and a sharp
− resonance with Γ = 0.12 MeV at 540 MeV. 相似文献
3.
P. Mason N. Marginean G. Montagnoli S. Beghini F. Scarlassara E. Farnea C. A. Ur A. Meroni A. M. Stefanini L. Corradi E. Fioretto I. V. Pokrovskiy B. Guiot A. Gadea J. J. Valiente-Dobón F. Della Vedova R. Orlandi E. Sahin D. R. Napoli L. Berti N. Toniolo S. Szilner M. Trotta M. Romoli M. La Commara D. Pierroutsakou M. Sandoli G. Pollarolo G. Benzoni 《The European physical journal. Special topics》2007,150(1):359-361
PRISMA is a magnetic
spectrometer installed at Laboratori Nazionali di Legnaro (Italy)
and designed for A=100–200, E=5–10 MeV-per-nucleon beams, and for
possible use with the proposed radioactive beam facility SPES. The
foremost features of the instrument are presented, along with the
outline of two data analyses exemplifying the effectiveness of
PRISMA-CLARA in studies of reaction
dynamics. 相似文献
4.
Y. X. Watanabe S. Arai Y. Arakaki Y. Fuchi Y. Hirayama N. Imai H. Ishiyama S. C. Jeong H. Kawakami H. Miyatake K. Niki T. Nomura M. Okada M. Oyaizu M. H. Tanaka M. Tomizawa N. Yoshikawa S. Abe S. Hanashima T. Hashimoto S. Ichikawa H. Ikezoe T. Ishii N. Ishizaki H. Kabumoto I. Katayama M. Koizumi M. Matsuda S. Mitsuoka T. Nakanoya K. Nishio I. Ohuchi A. Osa T. K. Sato S. Takeuchi H. Tayama Y. Tsukihashi 《The European physical journal. Special topics》2007,150(1):259-262
An ISOL-based radioactive nuclear beam (RNB) facility,
Tokai Radioactive Ion Accelerator Complex (TRIAC),
has been jointly developed
by High Energy Accelerator Research Organization (KEK)
and Japan Atomic Energy Agency (JAEA).
The facility started to supply RNBs for experiments in 2005
and RNBs including fission fragments with energies up to 1.1MeV/A
are available in the present.
Several experimental studies were performed successfully
using 8Li beams
with various energies. 相似文献
5.
《The European Physical Journal A - Hadrons and Nuclei》2003,20(1):193-197
Following the commissioning of the PRISMA large-acceptance spectrometer, installed at the Laboratori Nazionali di Legnaro (LNL), an international nuclear-structure collaboration has started to develop a large
-ray setup to be installed in the target position of the spectrometer. The array is based on the EUROBALL composite CLOVER detectors. In this contribution the CLOVER detector array is described and its expected performance figures discussed. This new setup, by using the high-intensity heavy-ion beams provided by the LNL ALPI linac, will push the study of nuclear structure towards moderately neutron-rich nuclei by means of quasi-elastic and deep inelastic reactions.Received: 15 December 2002, Revised: 28 April 2003, Published online: 23 March 2004PACS:
29.40.Wk Solid-state detectors - 29.30.Kv X- and
-ray spectroscopy 相似文献
6.
M. Barbui A. Andrighetto C. Antonucci S. Carturan F. Cervellera S. Cevolani M. Cinausero P. Colombo A. Dainelli P. Di Bernardo F. Gramegna G. Maggioni G. Meneghetti C. Petrovich L. Piga G. Prete V. Rizzi M. Santana-Leitner M. Tonezzer P. Zanonato D. Zafiropoulos 《The European physical journal. Special topics》2007,150(1):275-276
A Direct Target for a mid-term RIB ISOL-type facility is being developed at LNL, in the framework of the R&D for the SPES
project [1]. Using a 40 MeV proton beam impinging on a UCx thick target of 2.5 g/cm3 density, a production rate of 1013 in target fissions per second is expected [2]. The crucial point, when short-lived isotopes are produced in the target, is
to build systems (target + ion source) with good release properties and high efficiency.
Monte Carlo simulations were performed using the GEANT4 toolkit [3] and the RIBO code [4] in order to optimize our target
geometry and to estimate the average release time. 相似文献
7.
Masahiro Katoh 《Synchrotron Radiation News》2013,26(1):34-35
The UVSOR facility is a low-energy synchrotron radiation facility belonging to the Institute for Molecular Science in Okazaki, Japan. Since the first light in 1983, this facility has been operational as a national synchrotron light source for lower-energy photons from the terahertz wave to soft X-rays. The machine is operated for more than 2500 hours in a year. The cumulative number of users in a year is around 1,000. The UVSOR accelerator complex consists of a 15 MeV injector linac, a 750 MeV booster synchrotron, and a 750 MeV storage ring. The circumference of the ring is 53 m. A recent view of the storage ring and beamlines is shown in Figure 1. 相似文献
8.
ATPF—a dedicated proton therapy facility 总被引:1,自引:0,他引:1
A proton therapy facility based on a linac injector and a slow-cycling synchrotron is proposed. To obtain good treatments for different cancer types, both the spot scanning method and the double-scattering method are adopted in the facility, whereas the nozzles include both gantry and fixed beam types. The proton accelerator chain includes a synchrotron of 250 MeV in maximum energy, an injector of 7 MeV consisting of an RFQ and a DTL linac, with a repetition rate of 0.5 Hz. The slow extraction using the third-order resonance and together with the RFKO method is considered to be a good method to obtain a stable and more-or-less homogenous beam spill. To benefit the spot scanning 200 between 60 MeV and 230 MeV. A new method method, the extraction energy can be as many as about - the emittance balancing technique of using a solenoid or a quadrupole rotator is proposed to solve the problem of unequal emittance in the two transverse planes with a beam slowly extracted from a synchrotron. The facility has been designed to keep the potential to be upgraded to include the carbon therapy in the future. 相似文献
9.
J. van der Heide E. Laermann J.H. Koch 《The European Physical Journal C - Particles and Fields》2006,48(2):589-596
The matrix element of the electromagnetic current between pion states is calculated in quenched lattice QCD at a temperature of T=0.93 Tc. The non-perturbatively improved Sheikholeslami–Wohlert action is used together with the corresponding improved vector current. The electromagnetic vertex function is extracted for pion masses down to 360 MeV and momentum transfers Q2≤2.7 GeV2. 相似文献
10.
M. Marchetto Z. T. Ang K. Jayamanna R. E. Laxdal A. Mitra V. Zvyagintsev 《The European physical journal. Special topics》2007,150(1):241-242
ISAC at TRIUMF is a world-class facility for the production and post-acceleration of radioactive ion beams (RIB).
Commissioned in 2002 the ISAC I linear accelerator serves three different beam lines delivering
both stable and radioactive species.
Two of them are permanent experiments (DRAGON and TUDA); the third one is a general purpose station (GPS).
The maximum energy we can reach in ISAC I is 1.8 MeV/u.
ISAC II is a phased upgrade of the ISAC facility. The beam coming from ISAC I is injected at 1.5 MeV/u into
a new superconducting LINAC. In `Phase I' the LINAC adds 20 MV to the beam energy
and 20 MV more will be added in `Phase II'.
The paper will give an overview of both the ISAC I and ISAC II accelerators.
Operational experience with accelerating RIBs in ISAC I is summarized.
First ISAC II commissioning results are presented. 相似文献
11.
The Project SPES (study and production of exotic nuclei) aims at the full design of a facility based on a 100 MeV, 1–30 mA
CW proton Linac used for production of fission fragments from a uranium like target by means of a neutron converter. Neutron
rich ion species are extracted, selected, further ionized at high charge state, isotopically purified and then accelerated
through a superconducting Linac at energies up to 20 MeV/A. SPES represents INFN’s effort in view of the construction of the
European next generation ISOL-type facility, which is expected to be operative by 2010. A conceptual design report of such
a European facility is being prepared with the support of the European Commission. R&D activities, covering the most critical
parts of the facility, have been partially started in the last two years, triggered by the French-Italian feasibility study
of an accelerator driven system for waste transmutation.
On behalf of the SPES Collaboration 相似文献
12.
H. Rauch 《The European physical journal. Special topics》2008,159(1):27-36
Measurements of the π0 and direct photon nuclear modification
factors in p+p and A+A collisions in the PHENIX experiment
at RHIC will be reviewed and
recent results at
GeV will be presented. Using
for the first time the p+p reference measured in the same
experiment instead of averaging world data the π0 suppression
turns out to be almost as large at
GeV as at
GeV, implying gluon densities dNg/dy>800.
Possible origins of photon suppression at high pT in
GeV are discussed in light of the new results on
photon RAA at
GeV. 相似文献
13.
D. Savran W. Bayer D. Galaviz S. Müller K. Sonnabend A. Zilges 《The European Physical Journal A - Hadrons and Nuclei》2008,36(1):17-20
High-resolution photon scattering experiments have been performed on the nucleus 45Sc at the Darmstadt superconducting electron accelerator S-DALINAC using bremsstrahlung beams with end point energies of 5.0
and 7.0MeV. Energies, absolute cross-sections and decay widths of 50 states, most of them previously unknown, have been determined.
The results are compared to (γ,
) experiments on the neighbouring closed proton shell isotope 44Ca . 相似文献
14.
IHEP, China is constructing a 100 MeV/100 kW electron Linac for NSC KIPT, Ukraine. This linac will be used as the driver of a neutron source based on a subcritical assembly. In 2012, the injector part of the accelerator was pre-installed as a testing facility in the experimental hall ≠2 of IHEP. The injector beam and key hardware testing results met the design goal. Recently, the injector testing facility was disassembled and all of the components for the whole accelerator have been shipped to Ukraine from China by the ocean shipping. The installation of the whole machine in KIPT will be started in June, 2013. The construction progress, the design and testing results of the injector beam and key hardware are presented. 相似文献
15.
M. Re G. Cuttone L. Celona F. Chines E. Messina D. Rizzo F. Tudisco V. Scuderi 《The European physical journal. Special topics》2007,150(1):303-306
The EXCYT facility at the INFN-LNS is based on a K-800
superconducting cyclotron delivering stable ion beams on a Target
Ion Source (TIS) assembly to produce the required nuclear species,
and on a 15 MV Tandem for post-accelerating the radioactive beams.
For some ion beams such as for Li, the extraction efficiency from
the TIS is higher when obtained by positive ionisation, while the
injection into the Tandem is possible only after a charge exchange
to obtain negative ions. In this work we present the procedures
together with the results of the production of 6,7,8,9Li beams extracted at EXCYT during the last year. The
production of the radioactive elements was performed by sending a
13C4+ primary beam of 45 MeV/u on a graphite target. The
ionisation of the production species was achieved by a tungsten
positive surface ioniser. The Li+ has been extracted from TIS
at different energies to cross-check the transmission and the
charge exchange efficiency. To perform the conversion from
positive to negative ions we employed a Charge Exchange Cell (CEC)
containing Cs vapours. The Li beam interacts with the latter in a
two-step reaction, thus converting its charge from +1 to –1. The
CEC was already characterised during off-line tests; the results
obtained at EXCYT confirmed both the isotopic shift effect and the
efficiency values at several given extraction energies. Future
improvements of the TIS and the CEC are discussed. 相似文献
16.
FANG Shou-Xian GUAN Xia-Ling TANG Jing-Yu CHEN Yuan DENG Chang-Dong DONG Hai-Yi FU Shi-Nian JIAO Yi SHU Hang OUYANG Hua-Fu QIU Jing SHI Cai-Tu SUN Hong WEI Jie YANG Mei ZHANG Jing 《中国物理C(英文版)》2010,34(3)
A proton therapy facility based on a linac injector and a slow-cycling synchrotron is proposed. To obtain good treatments for different cancer types, both the spot scanning method and the double-scattering method are adopted in the facility, whereas the nozzles include both gantry and fixed beam types. The proton accelerator chain includes a synchrotron of 250 MeV in maximum energy, an injector of 7 MeV consisting of an RFQ and a DTL linac, with a repetition rate of 0.5 Hz. The slow extraction using the third-order resonance and together with the RFKO method is considered to be a good method to obtain a stable and more-or-less homogenous beam spill. To benefit the spot scanning method, the extraction energy can be as many as about 200 between 60 MeV and 230 MeV. A new method – the emittance balancing technique of using a solenoid or a quadrupole rotator is proposed to solve the problem of unequal emittance in the two transverse planes with a beam slowly extracted from a synchrotron. The facility has been designed to keep the potential to be upgraded to include the carbon therapy in the future. 相似文献
17.
TRIUMF 的三期升级工程(ARIEL) 计划建造一个 50 MeV 平均流强为10 mA的电子直线加速器作为注入器,通过光裂反应生成放射性核素。电子直线加速器包括两个主要部分:注入器和后加速器,注入器完成电子能量从100 keV到10 MeV的转换,随后的后加速器将电子能量从10 MeV加速到50 MeV。电子源拟采用重复频率为650 MHz的热电子枪提供初始能量为100 keV,束长为 171 ps的电子束。束流动力学模拟了几种不同的设计方案以获得最优化的设计,模拟显示通过对腔体以及聚焦元件的仔细设计以及电子枪出射电子的参数选择, 电子束能量在达到50 MeV时束长可以被聚焦到 11.75 ps (对应于1.3 GHz 频率下5.5°) ,并且可以使电子束在超导低温柜中的尺寸保持在1.26 cm以下。 相似文献
18.
Anthony R. Timmins 《The European Physical Journal C - Particles and Fields》2009,62(1):249-254
We report STAR measurements of mid-rapidity yields for the Λ ,
, K
S
0 , Ξ
−,
, Ω
−,
particles in Cu + Cu and Au + Au
GeV collisions. We show that at a given number of participating nucleons, bulk strangeness production is higher in Cu + Cu
collisions compared to Au + Au collisions at the same center of mass energy, counter to predictions from the Canonical formalism.
We compare both the Cu + Cu and Au + Au yields to AMPT and EPOS predictions, and find they reproduce key qualitative aspects
of the data. Finally, we investigate other scaling parameters and find bulk strangeness production for both the measured data
and theoretical predictions, scales better with the number participants that undergo more than one collision. 相似文献
19.
20.
H. Ueno D. Kameda D. Nagae M. Takemura K. Asahi K. Shimada K. Takase T. Sugimoto T. Nagatomo M. Uchida T. Arai T. Inoue A. Yoshimi T. Kawamura K. Narita 《The European physical journal. Special topics》2007,150(1):185-186
Ground-state magnetic-dipole moments (μ) of 30-32Al and
electric quadrupole moments (Q) of 31,32Al have been measured
with the β-NMR method using spin-polarized radioactive-isotope
beams produced in projectile-fragmentation reactions. Beams of
30-32Al were obtained by using RIKEN projectile-fragment
separator RIPS after the fragmentation of 40Ar projectiles at an
energy of E = 95A MeV on a 93Nb target. The obtained
μexp[30-32Al] and
values agree well with shell-model calculations within the sd
shell using the USD interaction. Also, Qexp[31Al]
was found to be small. Thus, we can conclude that these aluminum
isotopes are located outside the island of inversion. 相似文献