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GRETINA. ATLAS. GAMMASPHERE. GRETINA at ATLAS. C.J. (Kim) Lister ATLAS Users Workshop 8-9 th October 2009. GRETINA at ATLAS. C.J. (Kim) Lister Richmond Workshop on optimizing GRETINA Science 14-15 th October 2007. “Home Run Experiments”.

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GRETINA at ATLAS


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gretina at atlas

GRETINA

ATLAS

GAMMASPHERE

GRETINA at ATLAS

C.J. (Kim) Lister

ATLAS Users Workshop

8-9th October 2009

gretina at atlas1

GRETINA at ATLAS

C.J. (Kim) Lister

Richmond Workshop on optimizing GRETINA Science

14-15th October 2007

home run experiments
“Home Run Experiments”

What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere?

Heavy Element Spectroscopy

~ 100Sn “In-Beam”

Coulomb Excitation of CARIBU Beams

Inelastic Transfer with CARIBU (& stable) beams

slide4

Our Nuclear Domain

From: Yu. Ogenessian, DUBNA

home run experiments1
“Home Run Experiments”

What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere?

Heavy Element Spectroscopy

~ 100Sn “In-Beam”

Coulomb Excitation of CARIBU Beams

Inelastic Transfer with CARIBU (& stable) beams

slide6

100Sn Region “In-Beam”

MUST have Mass Selection

MUST have super-selective trigger.

Advantages: Count rate, Compact geometry favors FMA trigger, Efficiency for high energy gamma rays, Excellent Doppler Correction.

  • Simulated single-g efficiency  10% at 1.0 MeV

5% at 4.0 MeV

home run experiments2
“Home Run Experiments”

What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere?

Heavy Element Spectroscopy

~ 100Sn “In-Beam”

Coulomb Excitation of CARIBU Beams

Inelastic Transfer with CARIBU (& stable) beams

coulomb excitation of caribu neutron rich beams
Coulomb Excitation of CARIBU Neutron Rich beams

Two very exciting paths:

CHICO

Conventional Multi-Step Coulomb Excitation

OR

Unconventional “goundstate excitations only”

J

E

how much beam do we need with gammasphere
How much beam do we need with Gammasphere?

14h at 6.109 pps!

1/25

107 pps for 2 weeks

1/250

106 pps for 2 weeks

To identify excited 2+ state (beyond the 2+1) in vibrational nucleus (B(E2)~1Wu) with Gammasphere for 2 weeks beam time we need 105pps. For complete spectroscopy 106-107 pps will be needed!

1/2500

105 pps for 2 weeks

the gretina advantage
The Gretina Advantage

This kind of experiment is a “singles” study.

Rates will be low with CARIBU beams, so rate is not an issue.(Though probably needing an active beam detector)

BUT

Recoil velocity is well defined in direction, but large (~7%)

Gammasphere does not Doppler correct well, as gamma angle is not well defined, so lines are many 10’s keV broad …. sharpening them back to ~5keV will be equivalent (in sensitivity) to 10 times more beam.

home run experiments3
“Home Run Experiments”

What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere?

Heavy Element Spectroscopy

~ 100Sn “In-Beam”

Coulomb Excitation of CARIBU Beams

Inelastic Transfer with CARIBU (& stable) beams

slide13

Fission products

Deep-inelastic products

Fission products

Deep-inelastic products

Multinucleon transfer with thick and thin targets.

inelastic transfer
Inelastic Transfer

Is a dirty business…..

Lots of exotic nuclei can be made by

multi-neutron transfer....especially

starting with CARIBU beam

GRETINA counting at 50,000Hz is

needed to improve on Gammasphere

stable-beam transfer studies