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Pionic fusion: comparison of different spin/isospin channels. Study coherence of pion production, role of clustering correlations in the pionic fusion process, production mechanism: s, p-wave dynamics. Existing data and models. semi-phenomenological model:

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Pionic fusion comparison of different spin isospin channels
Pionic fusion: comparison of different spin/isospin channels

  • Study

  • coherence of pion

  • production,

  • role of clustering

  • correlations in the

  • pionic fusion process,

  • production mechanism:

    s, p-wave dynamics

H.L. / KVI PAC Meeting


Existing data and models
Existing data and models

semi-phenomenological model:

3-nucleon transfer by p-3He reaction,

analytic expressions for transfer

formfactors from HO wave functions

L. Bimbot et al.,

PL B 114(82)311

H.L. / KVI PAC Meeting


Interacting cluster model
Interacting cluster model

Kajino, Toki, Kubo, PRC 35(87)1370

correlated microscopic cluster wave functions using Resonating Group Method (RGM),

NN effective interaction + Coulomb

(check charge symmetry),

entrance channel distortions by

local imaginary potential WD

between clusters (from DWBA)

compared to

shell model wave functions

data suggest importance

of cluster correlations

H.L. / KVI PAC Meeting


Origin of enhancement in cluster model
origin of enhancement in cluster model

decomposition of contributions

inter-cluster (3H – 4He) relative motion

absorbs large momentum transfer

to fused system 7Li

H.L. / KVI PAC Meeting


Prediction for 0 fusion to 7 be
Prediction for 0 fusion to 7Be

chance to separate

g.s. and 0.429 excited state:

excellent application of

dual-range QDC´s

calculations

but now data

experiment strategy:

final-state slectivity by

-decay tagging

simulated CM distribution with 25000 accepted

events using cos2() distribution for pions

H.L. / KVI PAC Meeting


Inclusive d fusion
Inclusive d -  fusion

M. Andersson et al., PL B 481 (00)165

measured integrated cross section

(230 nb and 140 nb at 1.2 and 1.9 MeV above threshold) and

strong forward-backward asymmetry

data explained by process via

quasi-deuteron: overlap  with quasi-d

determines angular distribution

H.L. / KVI PAC Meeting


Systematic study of cluster structures

4He

7Be*

n

3He

0

Systematic study of cluster structures

similar processes but

with increasingly complex

cluster structure:

decisive tool: angular distributions

final-state slectivity by

-decay tagging

4He

7Be*

3He

0

?

10B

12C*

d

d

0

6Li

9Be

12C*

d

12C*

n

0

3He

d

0

6Li

H.L. / KVI PAC Meeting


Angle acceptance of fusion products
angle acceptance of fusion products

max. 3.8 deg in B mode

radiative fusion (capture)

pionic fusion

ground state

excited state (15.1 MeV)

H.L. / KVI PAC Meeting


Momentum acceptance of fusion products
momentum acceptance of fusion products

array of ca. 50 phoswich detectors

100 m plastic/CsI 1.3X4 cm2

in focal plane of BBS

for HI detection:

fusion products of 10 – 30 A MeV

B

coverage of

momentum distribution

by HI detectors:

all / accepted events

H.L. / KVI PAC Meeting


Summary
Summary

Reactions with increasing complexity in cluster structure

and different pion kinematics

)

(

kinematics

s-wave

p-wave

s-wave

p-wave

98

H.L. / KVI PAC Meeting


Acceptance of neutral pions
acceptance of neutral pions

H.L. / KVI PAC Meeting


Taps schedule
TAPS schedule

H.L. / KVI PAC Meeting


Table of bbs parameters
Table of BBS parameters

H.L. / KVI PAC Meeting


Proposed reactions
Proposed reactions

H.L. / KVI PAC Meeting


design of liquid He target as buffer cryostatby Vacuum Specials Co. and P. Dendooven, J. Mulder, H. Timersma, H.L.

H.L. / KVI PAC Meeting


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