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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


Pionic fusion comparison of different spin isospin channels
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