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Ana Montaner Pizá . Instituto de Física Corpuscular IFIC, Valencia, Spain. . Isospin Mixing And In-beam Study Of 56 C o Non- yrast States At MLL/ Miniball . Motivation And First Glance On The Results Of The Experiment. MINIBALL Workshop . 24-25 October 2013. CERN, Geneva .

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slide1

Ana MontanerPizá. Instituto de Física Corpuscular IFIC, Valencia, Spain.

Isospin Mixing And In-beam Study Of 56Co Non-yrast States At MLL/Miniball. Motivation And First Glance On The Results Of The Experiment

MINIBALL Workshop . 24-25 October 2013. CERN, Geneva.

physics motivations
Physics motivations
  • Starting point: Comparison of beta decay of 56Znwith its mirror process 56Fe(3He,t)56Co.

Motivations:

  • Study of theγde-excitation of the IAS in 56Co.
  • Clarification of the Jπ assignment of two key levels in 56Co.

At RCNP (Osaka, Japan)

At GANIL (France)

56 co present knowledge
56Co present knowledge
  • Present status of the 56Co nucleus from ENSDF  Evaluated Nuclear Structure Data File

Isospin mixed states

3076.0 keV, 1+ ?

2635.9 keV, 1+ ?

studying the mirror process beta decay experiment at ganil
Studying the mirror process: Beta decay experiment at GANIL

4 EXOGAM clovers

for gamma detection

4 EXOGAM clovers

for gamma detection

4 EXOGAM clovers

for gamma detection

  • The beta decay experiment was carried out at GANIL in 2010, focused on the production of 56Zn.

(S. Orrigo, B. Rubio, Y. Fujita, W. Gelletly et. al.)

  • The analysis of this experiment is very advanced. In order to fully interpret this work a better understanding of the 56Co excited states will be crucial.

56Zn → 56Cu + β+

56Zn

motivation i study of the de excitation of the ias in 56 co
Motivation I: Study of theγde-excitation of the IAS in 56Co

Isospin mixed states

IAS

  • Very low Sp
  • Proton decay for the IAS is isospin forbidden  gamma de-excitationispossible.

Reference: S.E.A. Orrigo et al., INPC 2013 Proceedings, EPJ Web of Conferences(2013).

motivation ii clarification of the j assignment of two key levels in 56 co 1
Motivation II: Clarification of the Jπ assignment of two key levels in 56Co (1)
  • The high energy-resolution 56Fe(3He,t)56Co reaction was carried out by Hiro Fujita et. al. at RCNP- Osaka.
  • According to their results, there exist serious doubts about the 1+ character of the states at 2.633MeV and 3.073MeV.

Reference: "Isospinmixingfortheisobaricanalogstatestudied in a high-resolution56Fe(3He,t)56Co reaction". H. Fujita, Y. Fujitaet al., submittedto PRC.

motivation ii clarification of the j assignment of two levels in 56 co 2
Motivation II: Clarification of the Jπ assignment of two levels in 56Co (2)

Well known 1+ distribution

2.633 MeV

3.076 MeV

2+ distribution

Reference: "Isospinmixingfortheisobaricanalogstatestudied in a high-resolution56Fe(3He,t)56Co reaction". H. Fujita, Y. Fujitaet al., submittedto PRC.

miniball experiment at the mll munich
MINIBALL experiment at the MLL (Munich)
  • Experiment carried out in the Maier-Leibnitz-Laboratorium(MLL) at the TechnischeUniversitätMünchen(TUM), in June 2013.
  • Reaction: 56Fe(p,n)56Co
  • 56Fe Target thicknesses: 1 and 2 mg/cm2
  • Proton beam: 10 MeV and 12 MeV
  • Beam intensity: 1-3 nA
  • Duration: 6 day
  • Angle calibration reaction:

32S(d,p)33S in inverse kinematics.

setup of the experiment
Setup of the experiment

MINIBALL clusters

Beam direction

MINIBALL cluster

preliminary results of miniball experiment at mll
Preliminary results of MINIBALL experiment at MLL

 Study of theγde-excitation of the IAS in 56Co.

Isospin mixed states

T=2 0+ IAS

T=1 0+

962

869

796

891

Either not there or much weaker, and we will get upper limits in due time

1806

1878

Gated in the 1185 keV line

1185

PRELIMINARY

962 keV

891 keV ?

preliminary results of miniball experiment at mll 2
Preliminary results of MINIBALL experiment at MLL (2)

 Clarification of the Jπ of the levels 3076 keV and 2636 keVin 56Co using angular correlations.

Isospin mixed states

T=2 0+ IAS

T=1 0+

962

869

796

891

PRELIMINARY

1185 keV

peak

2635.9 keV

1806

1878

1185

Gated in the 480 keV line

480

Miniball:

4 clusters

3 crystal/cluster

6 segments/crystal

1185 keVpeak from the de-excitation of the 2635 keV level:

# Counts: 1.12·105

# Counts per measurable angle: 1.12·105/(4x3x6) ≈ 1555

conclusions
Conclusions
  • Stability and well behaviour of MINIBALL detectors.
  • Crosstalkproblem.
    • WehavetorestricttocoincidencesbetweendifferentClusters.
  • From the motivation point of view:
    • Angular correlations: we will be able to clarify the spin-assignment of the 2636 keV and 3076 keV states.
    • Gamma de-excitation of the two 0+isospin mixed states  Weshould be ableto set meaningfulupperlimitstothose "new" two gamma linesfromthe de-excitation of the 0+ T=1 state.

Analysis in progress.

Verypreliminaryresultspresented.

slide13

A. Montaner-Pizá, B. Rubio, J. Agramunt, A. Algora, V. Guadilla, S. Orrigo. IFIC-Valencia, Spain.

  • D. Mücher, S. Reichert, S. Hellgartner, C. Berner. TUM, Munich, Germany.
  • B. Gelletly. Surrey University, U.K.
  • Y. Fujita. RCNP, Osaka, Japan.
  • E. Ganioglu, Istanbul University, Turkey.

Thank you!