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Events & history of VAMOS

 

 

 

Last experiments or events:

 

2017

...

first publication of the GANIL-AGATA campaign @VAMOS  :Measurement of lifetimes in  62,64Fe,61,63Co, and 59Mn   by M. Klintefjord, ,J.Ljungvall et Al.

 

2016

 

VISIT of the French president of GANIL_SPIRAL2.

 

E710  : C. Michelagnoli  (34 UT, Beam 24Mg@4.6 MeV/A)

set-up : 31/32 AGATA detectors at nominal position (23.5cm from target) for the detection of gamma rays

DE-E Si (SPIDER) mounted at 12cm from target position, detection of alphas and protons

SIRAD reaction chamber, 21um Gold stopper at 2cm from target

 

The aim of the experiment is the measurement of the lifetime of the astrophysically important 7.786MeV level in 23Mg. The radiative width of this state is dominating the cross-section of the 22Na(p,g)23Mg reaction, main destruction process for the 22Na produced in novae explosions. The aim of this experiment is to resolve the disagreement between the two existing direct determinations of the rate of this reaction, crucial for the test of novae models.

E708  :C. Fransen   (35 UT, Beam  238U @ 6.4 MeV/A)

set-up : VAMOS@46°+AGATA 32 detectors+ Cologne plunger

Studies of neutron rich Ti isotopes are of particular interest for an understanding of the shell structure

 

in the Ti-Cr-Fe region beyond N=28. Existing experimental data on 21+ states in N=32 isotones suggest a

 

phase transition from predominant collective structures in 58Fe toward a neutron subshellclosure developing

 

for decreasing number of protons in the f7/2 orbital, i.e., from 56Cr -> 54Ti -> 52Ca, due to the weakening of

the monopole interaction  between the proton f7/2 and neutron f5/2 orbitals.

 


 

E708  :I. Celikovic  (19 UT, Beam 208Pb@ 6.65 MeV/A)

set-up : VAMOS@45°+AGATA 32 detectors

The aim of the experiment is the study of the evolution of collectivity in the structure of neutron-rich nuclei with N=40-50. This is done by comparing the transition strengths for the first excited states in the neutron-rich Gallium and Zn isotopes with the prediction of the main theoretical models used in this region of the nuclear chart, with particular interest as a test of model spaces for the description of nuclei towards the doubly magic 78Ni.

 

E661  : A. Navin  (46 UT, Beam 238U@6.2 MeV/A)

set-up : VAMOS@20°+AGATA 32 detectors+ EXogam for delayed spectroscopy in VAMOS Focal plan

In the present measurement fission fragments produced in collisions of a 238U beam on a 9Be target were used to produce fission fragments (~ 400) to address the above problem.  The coincident prompt (< 3 ns) gamma- decay (of the excited states) are detected using the 32 detectors of AGATA around the target and the delayed  (upto 200 micro seconds) are detected in 7 EXOGAM clovers placed at end of the Focal plane of VAMOS. A combination of the intense beam used in inverse kinematics along with the selective and sensitive setup used in the present experiment, make it unique in the world and will  provide   a wealth of data to attack a variety of  questions in nuclear structure at fairly high spin in neutron-rich nuclei.

 

2015

April 2015: E666 .D. VERNEY (32 UT, Beam 238U@6.2 MeV/A)

set-up : VAMOS@20°+AGATA with the so called plunger

 

March 2015: first experiment with AGATA (8 triple clusters)

E619 :J. LJUNGVALL  (25 UT, Beam 238U@6.5 MeV/A) 

This experiment aimes at measuring lifetimes of excited states in 62-66Fe using multinucleon transfer reactions with a 238U beam on a 64Ni target. It uses a so-called plunger device to do this. The experiment tries to answer questions regarding to the evolution of magic numbers and collectivity in atomic nuclei. It will profit a lot from the compact geometry of AGATA allowing a lot of efficiency within a small angle.

 

Febuary 2015 (very rare event) : 3 Ministers in G1 during few minutes !!!

 The french Prime Minister(M. Valls), with two other french ministers (L. Fabius, B. Cazeneuve) visited

  the G1 cave to have a look to the AGATA+VAMOS set-up.....

 

2014 : Installation of AGATA  in G1 Cave …

 

december 2014  :  commissionning of VAMOS+AGATA with 3 triple clusters

 

2013

E655s : Gilibert, F Flavigny et Al : Study of asymmetry dependence of valence  nucleon correlation from 18Ne

(Must2+ Vamos) beam 18Ne

Test641s : detection  test  of proton in the Drift Chambers ….

E641s, B. Bastin et Al, Measurement of the missing structure properties of astrophysical importance in 19Ne via a strongly improved inelastic scattering method

2012

E619 : Y. Watanabe et Al , production of neutron rich by multinucleon transfert reaction 136Xe+198Pt  :

E586: Javier Valiente et Al, production of neutron rich Os by multinucleon transfert reaction 208Pb+198Pt  :

2011

E585: Fission Fragment spectroscopy : single particle and vibrational states in 133Sn: 238U31+ 6.x MeV/A

E604 : A. Gorgen et Al, Shapes in neutron rich A#100 nuclei from lifetime measurement in fission fragment : 238U31+ 6.2 MeV/A

E516 a: F. Farget et Al, isotopic distribution of fission fragment yield in transfer induced fission using inverse kinematics:

E596 : L. Gaudefroy et Al , study of new decay mode for nuclear states:  136Xe 5.0 MeV/A


VAMOS is operational since 2001

The VAMOS project has involved five european laboratories : GANIL (Fr), GSI (Ge), CCLRC Daresbury (UK) and the Universities of Liverpool and Surrey (UK). Outside of this contract, other institutions participate actively in its optimisation, development and construction, the IPN Orsay, the CENBG Bordeaux, the CEA/SPhN (Fr), the Universities of Giessen (Ge) and Manchester (UK).

 

 

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