KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around.

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Presentation transcript:

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE Nikolas Patronis

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline Physics case: Region of interest Why to study the 66 Ni(d,p) 67 Ni Experimental method & set-up: Newly built Si detector barrel configuration Technique Beam time request: Considerations Expected counting rate 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Physics case 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury

First excited state 0 + at higher energies The 2 + state at larger excitation energy Small B(E2, ) No irregularity at the S 2n or at the binding energies Fragile nature of the N=40 subshell closure Other reasons for the small observed B(E2, ) KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Physics case 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury 68 Ni d 3/2 f 7/2 p 3/2 f 5/2 p 1/2 ●●●●●●●● ●●●● 28 p 3/2 p 1/2 g 9/2 f 5/2 ●●●● ●●●●●● ●● 40 π ν Is the nature of the N=40 subshell closure understood? S. Rahaman et al., Eur. Phys. J. A 34, 5 (2007) …controversial conclusions! Next step: the study of the single particle character

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Physics case 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury 67 Ni d 3/2 f 7/2 p 3/2 f 5/2 p 1/2 ●●●●●●●● ●●●● 28 p 3/2 p 1/2 g 9/2 f 5/2 ●●●● ●●●●●● ● 40 π ν Study of the single particle character of the neutron rich Ni isotopes Physics case: 2 H( 66 NI,p) 67 Ni,Q = MeV 67 Ni g one hole state of the 68 Ni g factor exp. value smaller by a factor of 2 than the expected for 1g 9/2 Unambiguous determination of the spin and parities of the the first excited states - one more state ν 3/2 not yet observed Single particle character of the states of 67 Ni (relative SF’s) A good starting point as to determine the single particle character of the Ni isotopic chain – single particle systematics

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Experimental method & setup 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury DetectorAnglesThicknessSegmentation Forw. CD (ΔE) μm16 annular x 24 radial Forw. CD (E) mmno Forw. Barrel (ΔE) μm 16 stripes  beam + ch. Div resistive layer Forw. Barrel (PAD) mmno Back. Barrel μm 16 stripes  beam + ch. Div resistive layer Back. CD μm16 annular x 24 radial γ-ray detection: 8 Miniball clusters (ε ~ 8 %) Beam composition: Bragg detector, HPGe detector, Laser on/off Particle detection:

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Experimental method & setup 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury “Thick” CD 2 target measurement (1mgr/cm 2 ) Spectroscopic information for the excited states up to 3 MeV. Coincidences with γ “Thin” CD 2 target measurement (100 μgr/cm 2 ) Spectroscopic information for the ground and the second excited state. Singles: only backward angles

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Beam time request 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury DWBA calculations Counting rate: Considering: ● 10 6 pps at the MINIBALL target (ε REX = 5%, Primary ISOLDE yield: ) ● ~ ε part = 55 %, ε γ = 8 % ● σ from DWBA assuming SF =0.2 ● Requested beam time: 11 shifts for the “thick” target run 11 shifts for the “thin” target run +3 shifts for beam preparation. 25 shifts in total

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Summury 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury The properties of the nuclei in the mass region around 68 Ni have been extensively studied up to now with controversial results The fragile nature of the N=40 subshell closure is not yet understood We propose the study of the single particle properties starting with: d( 66 Ni,p) 67 Ni reaction Intense beam of 66 Ni is available at ISOLDE + Si barrel + MINIBALL  REX-ISOLDE unique site to perform also transfer reaction studies Spectroscopic information can be obtained for the ground and first excited states of 67 Ni. Also the relative SF will be directly compared with large scale shell model calculations

Katholieke Univesiteit Leuven, Belgium IPN Orsay, France CSNSM, Orsay, France Technische Universität München, Germany Universität zu Köln, Germany Technische Universität Darmstadt, Germany Ludwig-Maximillians-Universität München, Germany INP, NCSR “Demokritos”, Greece Lund University, Sweden CERN, Switzerland University of Edinburgh, United Kingdom University of Liverpool, United Kingdom University of Manchester, United Kingdom University of Paisley, United Kingdom University of York, United Kingdom KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Collaboration 1. Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury Sensitivity study of SF by changing the single particle potential parameters 28 DWBA calculations 64 Ni(d,p) 65 Ni g 1.00 fm < r < 1.40 fm 0.50 fm < a< 0.75 fm 14 DWBA calculations 64 Ni(d,p) 65 Ni 1.00 fm < r < 1.40 fm 0.50 fm < a < 0.75 fm

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury What we learn? At the available beam energies we can’t deduce absolute SF’s BUT relative SF’s can be obtained quite accurately

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury 64 Ni(d,p) 65 Ni Ed=7.5 MeV T.R. Anfinsen et al NPA (1970) D.L. Watson and D.N. Slater JPG (1983) 30 Si(d,p) 31 Si: Ed=17 MeV

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury Ground MeV MeV MeV MeV

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury Runs(15+18) Stripes Runs(15+18) Stripes 7+8 Runs(20+…) Stripes 7+8

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Summury A.M. Oros-Peusquens and P.F. Mantica NPA (2000)

KS group meeting April 2007Transfer reactions at REX-ISOLDE: Status and a physical case to be studied K. U. Leuven One Nucleon Transfer Reactions Around 68 Ni at REX-ISOLDE K.U.Leuven IKS INTC meeting: 11 Feb Outline2. Physics case3. Experimental method & setup 4. Beam time request 5. Outlook