1414N(p,N(p,γγ))1515OOHeide Costantini and Hanns-Peter Trautvetter

CNO neutrinos Globular cluster age

- Situation at Adelberger et al

- New measurements and new evaluations

since 1998

- Remaining uncertainties

- Major issues to discuss at the workshop

OutlineOutline

AdelbergerAdelberger et al. (1998) et al. (1998)

-1963 Hebbard and Bailey : NaI-1957 Pixley: NaI- 1951 Duncan and Perry: Geiger counter technology-activation

-205-3500 keV prompt gamma with germanium det.

-Solid and gas target

-Measurement of all gamma transitions

-High extrapolation of GS transition using BW fit

Subthreshold resonance at -504 keV :Γγ = 6.3 eV

NOT USED

USED- activation ΔE=100-135 keV- possible H implantation in TiN targets can change stopping power- 8% screening effect has to be corrected

1957 Lamb Hester

1987 Schröder

Without subthresholdresonance

With subthresholdresonance

(Schröder’s results)

What happened after 1998?What happened after 1998?

factor 20 !

Angulo et al 2001

Angulo and Descouvemont: Nucl. Phys. A 2001

R-matrix analysis of the RC→0, RC→6.79, RC→6.18 reansitions:All Γp and Γγ are left as free parametersRC->0 was fitted, founding Γγ(-504 keV)=1.75 eV

Stot= 1.77 ± 0.20 keV b

This R-matrix reanalysis pushed a new series of experiments!!

DIRECT DIRECT MEASUREMENTSMEASUREMENTS

(measurement of S(measurement of S--factors of factors of γγ transitionstransitions))

INDIRECT INDIRECT MEASUREMENTSMEASUREMENTS

(measurement of the ANC and (measurement of the ANC and ΓΓγγ of the 6793 of the 6793 keVkeV state)state)

- LUNA: solid target + HpGe (2004)

- LENA: solid target + HpGe (2005)

- LUNA: gas target + BGO (2006)

- LUNA: solid target + clover (2008)

- TUNL: DSAM (2001)

- TUNL: 14N(3He,d)15O (2002)

- Mukhamezhanov et al.: 14N(3He,d)15O (2003)

- Nelson et al. : Analyzing power (2003)

- Yamada et al. : Coulomb excitation (2004)

- BOCHUM: DSAM (2008)

DSAM: DopplerDSAM: Doppler--Shift Attenuation methodShift Attenuation methodCoulomb excitationCoulomb excitationΓγΓγ(6793)(6793)

TUNL: DSAM 2001 [Bertone et al.]

- target: 14N implanted in Ta

- 3 HPGe det. at 0o, 90o, 144o

- τ = 1.60 fs → Γγ = 0.41 eV75.072.0

+−

34.013.0

+−

BOCHUM: DSAM 2008 [Schurmann et al.]

- target: 14N implanted in Ta

- 1 HPGe det. on a turntable: Δθ= -40o + 116o

- τ < 0.77 fs → Γγ > 0.85 eV

Yamada et al. : Coulomb excitation 2004

- 15O beam on lead target at 85A MeV at RIKEN

- NaI(Tl) array around the target to detect γ from 15O

- Γγ = 0.95 eV60.095.0

+−

ANC(6793) ANC(6793) 1414N(N(33He,d)He,d)1515OO

Mukhamedzhanov: 2003

- 26.3 MeV 3He beam

- d collected at Δθ = 6.50-700 ,

- 14N+3He elastic scattering measurement

- ANC obtained for all the bound states

- ANC(6793)= 4.9 ± 0.5 fm-1/2

=5.2 ± 0.7 fm-1/2 reanalysis of Bertone

- R-matrix fit of Schröder’s data RC→0, RC→6.79, RC→6.18RC →6.86

- Stot=1.70 ± 0.22 keVb

TUNL: 2002 [Bertone et al.]

- 20 MeV 3He2+ beam on 14N implanted in C foil

- d collected at Δθ = 50-450

- ANC obtained for all the bound states and 7.56 MeV

- ANC(6793)= 4.6 ± 0.5 fm-1/2

LUNA measurementsLUNA measurements

• TiN targets + HpGe detector• Measurement of all γ transitions•ΔE= 119-367 keV• summing had to be considered• R-matrix on single transitions• confirm low SGS(0): Γγ(-504 keV)=0.8 eV•ANC(6793) = 4.7 ± 0.1 fm-1/2

S(0)tot = 1.61 ± 0.08 kev b

Solid target (2004Solid target (2004) [Formicola et al][Imbriani et al]

Gas target (2006) Gas target (2006) [Lemut et al][Bemmerer et al]

BGOBGO

• N2 target + BGO detector• Measurement of total cross section• ΔE= 70-230 keV• R-matrix solid target in agreement with data

Clover detector (2008) Clover detector (2008) [Marta et al]

• TiN target + clover detector• Measurement of the RC→0 transition• E=318,334,353 keV• negligible summing correction•Γγ(-504 keV)=0.9 ± 0.2 eV

LENA measurement (2005) LENA measurement (2005) [Runkle et al.]

• TaN targets + HpGe detector and active shielding

• Measurement of RC→0, RC→6.79, RC→6.18

•ΔE = 145-490 keV

• summing had to be considered

• R-matrix on single transitions

• confirm low SGS(0): Γγ(-504 keV)= 1.9 eV

•ANC(6793)= 4.66 ± 0.04 fm-1/2

S(0)tot = 1.68 ± 0.09 ± 0.16 kev b

0.01

0.1

1

10

0 100 200 300 400 500 600 700 800

Schroeder 1987LUNA dataLENA dataLENA fitLUNA fitMukhamedzhanovMartaMarta fit

Status of RCStatus of RC→→0 transition0 transition

Formicola R-matrix fit includes Schröder data corrected by summingRunkle R-matrix fit includes only their dataIn the two fits the free parameters are not the sameΓγ and ANC obtained by R-matrix fits are almost compatible with values obtained by indirect methodsS(0) is very sensitive to energy region above300 keV

0.15 ± 0.07

Mukhamedzhanov

0.2 ± 0.05

LUNA(Marta et al.)

0.49 ± 0.080.25 ± 0.060.08Sgs(o)[kevb]

RunkleFormicolaAngulo

13.006.0

+−

S(E)

(keV

b)

Ecm(keV)

Status of RCStatus of RC→→6.79 transition6.79 transition

Formicola R-matrix fit includes data at higher energies (Klug et al. in preparation)

ANC obtained by R-matrix fits are almost compatible with values obtained by indirect methods

Some discrepancy at higher energies

1.40 ± 0.20

Mukhamedzhanov

1.15 ± 0.051.21 ± 0.051.63 ± 0.17S6.79(o)[kevb]

RunkleImbrianiAngulo

0.1

1

10

0 0.2 0.4 0.6 0.8 1E (MeV)

S (k

eVb)

LUNAcombined fitNelsonLENASCHROEDERBOCHUM-imbrianiMukhamedzhanovGrineviciute

0.001

0.01

0.1

1

10

100

1000

0 100 200 300 400 500 600 700

Schroeder 1987LUNA dataLUNA fitLENA dataLENA fitGrineviciute(2008)Mukhamedzhanov Nelson

Status of RC Status of RC →→ 6.18 transition6.18 transition

0.13 ± 0.02

Mukhamedzhanov

0.16 ± 0.06

Nelson

0.04 ± 0.010.08 ± 0.030.06S6.18(o)[kevb]

RunkleImbrianiAngulo01.002.0

+−

Question of M1 contribution (Nelson)

Runkle, Imbriani and Mukhamedzhanov R-matrix fits are done with different input resonances

S(E)

(keV

b)

Ecm(keV)

Total S-factor

Can we use Stot data to constraint the R-matrix fit?

1.70 ± 0.22

Mukhamedzhanov

1.57 ± 0.13

Marta

3.2 ± 0.54

Schröder

1.68 ± 0.09± 0.161.61 ± 0.08 1.77 ± 0.20Stot(o)[kevb]

RunkleImbrianiAngulo

Discussing issues for the WG session

• discussion on different results of different γ transitions S-factors

•combine results to obtain recommended S(0) for different γ transitions (Trautvetter and

Champagne involved in discussion)

• common range of ANC and Γγ for the 6793 keV state from ind. meas.

• Adopted value for Γγ and Γp for the 7554 keV state +error

• Recommendations for future R-matrix fit (which data should be used) and future

experimental measurements

•Electron screening effect and its error